dcrat | d9cbcae95ae824014b6d2fd6d3269b00b09ab84ed44b45b21c0b1842e7cdc132

General

Target

DCRatBuild.exe
Size

1.1MB
MD5

7ef93a29c05d412dd2dc432e1aac54a9
SHA1

776cc5c36f370a7e1fa840a21c13f2278723409e
SHA256

d9cbcae95ae824014b6d2fd6d3269b00b09ab84ed44b45b21c0b1842e7cdc132
SHA512

26e00619e47a130fb768b91074915c8a69f8690ac12465f21c1bd7e69f94ae6db9a238ff3c510a719cf1a318a07c80a543212c200b2b2152934a1ad154d13ab6
SSDEEP

12288:URZ+IoG/n9IQxW3OBseUUT+tcYbv+RK+UfXST5/rKMyFckcb8M41AT0z/GAFPz3m:u2G/nvxW3WieC7STuMMATKPTVgxr4q

Score

10^/10

dcrat discovery infostealer persistence rat

Malware Config

Signatures

DcRat 35 IoCs

DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.

rat infostealer dcrat

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeDCRatBuild.exeschtasks.exeschtasks.exeBridgewebsvc.exeschtasks.exe

pid	process
1228	schtasks.exe
3096	schtasks.exe
4276	schtasks.exe
1188	schtasks.exe
4668	schtasks.exe
748	schtasks.exe
4284	schtasks.exe
1704	schtasks.exe
4516	schtasks.exe
4632	schtasks.exe
4856	schtasks.exe
3288	schtasks.exe
3504	schtasks.exe
2440	schtasks.exe
4748	schtasks.exe
1264	schtasks.exe
244	schtasks.exe
2800	schtasks.exe
1616	schtasks.exe
3720	schtasks.exe
2652	schtasks.exe
4116	schtasks.exe
3836	schtasks.exe
3748	schtasks.exe
4120	schtasks.exe
2348	schtasks.exe
3476	schtasks.exe
1416	schtasks.exe
3552	schtasks.exe
3964	schtasks.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DCRatBuild.exe
3512	schtasks.exe
1432	schtasks.exe
File created	C:\Program Files (x86)\Microsoft.NET\56085415360792	Bridgewebsvc.exe
2644	schtasks.exe

Dcrat family
dcrat

Modifies WinLogon for persistence 2 TTPs 11 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

Processes:

Bridgewebsvc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\", \"C:\\Recovery\\WindowsRE\\csrss.exe\", \"C:\\Windows\\Globalization\\OfficeClickToRun.exe\", \"C:\\Program Files\\Windows Photo Viewer\\de-DE\\Idle.exe\", \"C:\\Program Files\\Windows Photo Viewer\\fr-FR\\RuntimeBroker.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\", \"C:\\Recovery\\WindowsRE\\csrss.exe\", \"C:\\Windows\\Globalization\\OfficeClickToRun.exe\", \"C:\\Program Files\\Windows Photo Viewer\\de-DE\\Idle.exe\", \"C:\\Program Files\\Windows Photo Viewer\\fr-FR\\RuntimeBroker.exe\", \"C:\\Program Files (x86)\\Windows Media Player\\Skins\\StartMenuExperienceHost.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\", \"C:\\Recovery\\WindowsRE\\csrss.exe\", \"C:\\Windows\\Globalization\\OfficeClickToRun.exe\", \"C:\\Program Files\\Windows Photo Viewer\\de-DE\\Idle.exe\", \"C:\\Program Files\\Windows Photo Viewer\\fr-FR\\RuntimeBroker.exe\", \"C:\\Program Files (x86)\\Windows Media Player\\Skins\\StartMenuExperienceHost.exe\", \"C:\\PortproviderRuntime\\OfficeClickToRun.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\", \"C:\\Recovery\\WindowsRE\\csrss.exe\", \"C:\\Windows\\Globalization\\OfficeClickToRun.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\", \"C:\\Recovery\\WindowsRE\\csrss.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\", \"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\", \"C:\\Users\\Default\\Documents\\Registry.exe\", \"C:\\PortproviderRuntime\\smss.exe\", \"C:\\Recovery\\WindowsRE\\csrss.exe\", \"C:\\Windows\\Globalization\\OfficeClickToRun.exe\", \"C:\\Program Files\\Windows Photo Viewer\\de-DE\\Idle.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\", \"C:\\Windows\\twain_32\\dwm.exe\""	Bridgewebsvc.exe

Process spawned unexpected child process 33 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

description	pid	pid_target	process
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1264	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2348	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4276	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2644	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1188	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3552	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	244	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1228	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2440	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	748	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1616	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3512	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1432	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1704	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3476	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4116	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4120	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4632	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1416	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2652	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3096	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3288	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4516	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4856	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3504	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3720	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3748	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3836	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4668	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2800	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3964	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4284	2236	schtasks.exe
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4748	2236	schtasks.exe

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
C:\PortproviderRuntime\Bridgewebsvc.exe	dcrat
behavioral1/memory/1820-13-0x0000000000520000-0x00000000005F6000-memory.dmp	dcrat

Executes dropped EXE 2 IoCs

Processes:

Bridgewebsvc.exeRegistry.exe

pid process

1820 Bridgewebsvc.exe
2304 Registry.exe

Adds Run key to start application 2 TTPs 22 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

Bridgewebsvc.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\StartMenuExperienceHost = "\"C:\\Program Files (x86)\\Windows Media Player\\Skins\\StartMenuExperienceHost.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\PortproviderRuntime\\OfficeClickToRun.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\PortproviderRuntime\\smss.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Windows\\Globalization\\OfficeClickToRun.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Program Files\\Windows Photo Viewer\\de-DE\\Idle.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\StartMenuExperienceHost = "\"C:\\Program Files (x86)\\Windows Media Player\\Skins\\StartMenuExperienceHost.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\twain_32\\dwm.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Program Files\\Microsoft Office 15\\ClientX64\\dwm.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\Registry = "\"C:\\Users\\Default\\Documents\\Registry.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Registry = "\"C:\\Users\\Default\\Documents\\Registry.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Recovery\\WindowsRE\\csrss.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Recovery\\WindowsRE\\csrss.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\Idle = "\"C:\\Program Files\\Windows Photo Viewer\\de-DE\\Idle.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Program Files\\Windows Photo Viewer\\fr-FR\\RuntimeBroker.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\PortproviderRuntime\\OfficeClickToRun.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Windows\\twain_32\\dwm.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\PortproviderRuntime\\smss.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\OfficeClickToRun = "\"C:\\Windows\\Globalization\\OfficeClickToRun.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000\Software\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Program Files\\Windows Photo Viewer\\fr-FR\\RuntimeBroker.exe\""	Bridgewebsvc.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Program Files (x86)\\Microsoft.NET\\wininit.exe\""	Bridgewebsvc.exe

Drops file in Program Files directory 11 IoCs

Processes:

Bridgewebsvc.exe

description	ioc	process
File created	C:\Program Files\Microsoft Office 15\ClientX64\6cb0b6c459d5d3	Bridgewebsvc.exe
File created	C:\Program Files (x86)\Windows Media Player\Skins\55b276f4edf653	Bridgewebsvc.exe
File created	C:\Program Files (x86)\Microsoft.NET\wininit.exe	Bridgewebsvc.exe
File opened for modification	C:\Program Files (x86)\Microsoft.NET\wininit.exe	Bridgewebsvc.exe
File created	C:\Program Files (x86)\Microsoft.NET\56085415360792	Bridgewebsvc.exe
File created	C:\Program Files\Microsoft Office 15\ClientX64\dwm.exe	Bridgewebsvc.exe
File created	C:\Program Files (x86)\Windows Media Player\Skins\StartMenuExperienceHost.exe	Bridgewebsvc.exe
File created	C:\Program Files\Windows Photo Viewer\de-DE\Idle.exe	Bridgewebsvc.exe
File created	C:\Program Files\Windows Photo Viewer\de-DE\6ccacd8608530f	Bridgewebsvc.exe
File created	C:\Program Files\Windows Photo Viewer\fr-FR\RuntimeBroker.exe	Bridgewebsvc.exe
File created	C:\Program Files\Windows Photo Viewer\fr-FR\9e8d7a4ca61bd9	Bridgewebsvc.exe

Drops file in Windows directory 4 IoCs

Processes:

Bridgewebsvc.exe

description	ioc	process
File created	C:\Windows\Globalization\e6c9b481da804f	Bridgewebsvc.exe
File created	C:\Windows\twain_32\dwm.exe	Bridgewebsvc.exe
File created	C:\Windows\twain_32\6cb0b6c459d5d3	Bridgewebsvc.exe
File created	C:\Windows\Globalization\OfficeClickToRun.exe	Bridgewebsvc.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 3 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

Processes:

DCRatBuild.exeWScript.execmd.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	DCRatBuild.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 1 IoCs

Processes:

DCRatBuild.exe

description ioc process

Key created \REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings DCRatBuild.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-21-2253712635-4068079004-3870069674-1000_Classes\Local Settings	DCRatBuild.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 33 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

T1053.005

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid	process
4120	schtasks.exe
1188	schtasks.exe
244	schtasks.exe
4116	schtasks.exe
1432	schtasks.exe
3476	schtasks.exe
4856	schtasks.exe
3748	schtasks.exe
3836	schtasks.exe
2348	schtasks.exe
3552	schtasks.exe
2440	schtasks.exe
4284	schtasks.exe
4748	schtasks.exe
1704	schtasks.exe
1264	schtasks.exe
4276	schtasks.exe
2644	schtasks.exe
748	schtasks.exe
4516	schtasks.exe
3720	schtasks.exe
3964	schtasks.exe
1228	schtasks.exe
4632	schtasks.exe
3288	schtasks.exe
2652	schtasks.exe
2800	schtasks.exe
1616	schtasks.exe
3512	schtasks.exe
1416	schtasks.exe
3096	schtasks.exe
3504	schtasks.exe
4668	schtasks.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

Processes:

Bridgewebsvc.exeRegistry.exe

pid	process
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
1820	Bridgewebsvc.exe
2304	Registry.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

Bridgewebsvc.exeRegistry.exe

description pid process

Token: SeDebugPrivilege 1820 Bridgewebsvc.exe
Token: SeDebugPrivilege 2304 Registry.exe

description	pid	process
Token: SeDebugPrivilege	1820	Bridgewebsvc.exe
Token: SeDebugPrivilege	2304	Registry.exe

Suspicious use of WriteProcessMemory 10 IoCs

Processes:

DCRatBuild.exeWScript.execmd.exeBridgewebsvc.exe

description	pid	process	target process
PID 2032 wrote to memory of 2240	2032	DCRatBuild.exe	WScript.exe
PID 2032 wrote to memory of 2240	2032	DCRatBuild.exe	WScript.exe
PID 2032 wrote to memory of 2240	2032	DCRatBuild.exe	WScript.exe
PID 2240 wrote to memory of 4932	2240	WScript.exe	cmd.exe
PID 2240 wrote to memory of 4932	2240	WScript.exe	cmd.exe
PID 2240 wrote to memory of 4932	2240	WScript.exe	cmd.exe
PID 4932 wrote to memory of 1820	4932	cmd.exe	Bridgewebsvc.exe
PID 4932 wrote to memory of 1820	4932	cmd.exe	Bridgewebsvc.exe
PID 1820 wrote to memory of 2304	1820	Bridgewebsvc.exe	Registry.exe
PID 1820 wrote to memory of 2304	1820	Bridgewebsvc.exe	Registry.exe

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe
"C:\Users\Admin\AppData\Local\Temp\DCRatBuild.exe"
1⤵
- DcRat
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:2032
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\PortproviderRuntime\2jiE6dDNxF2hUpVE5Z.vbe"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2240
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\PortproviderRuntime\OI2YygSphQCiiCNA7ofzvo.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4932
  - - C:\PortproviderRuntime\Bridgewebsvc.exe
      "C:\PortproviderRuntime\Bridgewebsvc.exe"
      4⤵
      DcRat
      Modifies WinLogon for persistence
      Executes dropped EXE
      Adds Run key to start application
      Drops file in Program Files directory
      Drops file in Windows directory
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1820
    - - C:\Users\Default\Documents\Registry.exe
        
        "C:\Users\Default\Documents\Registry.exe"
        5⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2304

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Microsoft.NET\wininit.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1264

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Microsoft.NET\wininit.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 13 /tr "'C:\Windows\twain_32\dwm.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Windows\twain_32\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1188

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 11 /tr "'C:\Windows\twain_32\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\dwm.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:244

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Program Files\Microsoft Office 15\ClientX64\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 8 /tr "'C:\Program Files\Microsoft Office 15\ClientX64\dwm.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 13 /tr "'C:\Users\Default\Documents\Registry.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Users\Default\Documents\Registry.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Users\Default\Documents\Registry.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 7 /tr "'C:\PortproviderRuntime\smss.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\PortproviderRuntime\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1704

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\PortproviderRuntime\smss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4116

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4120

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\csrss.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 8 /tr "'C:\Windows\Globalization\OfficeClickToRun.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1416

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Windows\Globalization\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2652

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 14 /tr "'C:\Windows\Globalization\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3096

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 14 /tr "'C:\Program Files\Windows Photo Viewer\de-DE\Idle.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3288

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\de-DE\Idle.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4516

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 11 /tr "'C:\Program Files\Windows Photo Viewer\de-DE\Idle.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files\Windows Photo Viewer\fr-FR\RuntimeBroker.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\fr-FR\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 8 /tr "'C:\Program Files\Windows Photo Viewer\fr-FR\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Media Player\Skins\StartMenuExperienceHost.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3836

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Media Player\Skins\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4668

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Media Player\Skins\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 10 /tr "'C:\PortproviderRuntime\OfficeClickToRun.exe'" /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3964

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\PortproviderRuntime\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4284

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 11 /tr "'C:\PortproviderRuntime\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4748

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\PortproviderRuntime\2jiE6dDNxF2hUpVE5Z.vbe

Filesize
218B

MD5
413767cf51f36f7f50d9430d73ea0bb1

SHA1
4469733bce94a114c836ea3591dccb3e689782c7

SHA256
2e118668b3c63457b924aafd6b402e105477030d6157e3d66ba8ba7acad58dcf

SHA512
3c12a46412227f57f8aa815b0b7820ca54eb3fa7a033ea7baa7efad7526755db7998d843a6790880efa87b841e9c6085b793930ae865c2694c8385e5937ee900

Download Submit
C:\PortproviderRuntime\Bridgewebsvc.exe

Filesize
828KB

MD5
fddea23e803e9e5de212e4c0475c8f93

SHA1
c4426bf36ce54917155da2bfbec1508c5a799664

SHA256
f014b4dd1600fb5ecd92de55165573415c2d7ee184a4f70f2f975ee7909150f6

SHA512
05459fc75998ee306e8de7e544aaf744e5c6e1930dcb7e02b94a566a7ad6e874a9fe50a78a1da50b4e7110282e49353f8ced586117d772b600b84d09ee070591

Download Submit
C:\PortproviderRuntime\OI2YygSphQCiiCNA7ofzvo.bat

Filesize
41B

MD5
863d81db66a0a5864890665ea50c23c5

SHA1
f5a584f4ee5e390b667eaa5e5d9332251388fa7e

SHA256
d4fa2e3203a21efd9f46fd9ea5fcedbabe13bd9a2bc93d0169070507380bbf9b

SHA512
ecb8ff338e0febcfe8965516a58dcdcd63420592467ce1c281f7ccacf7a2ca02bd7a73d52208e98edec3e73ea69477f3ccaa4ddf4b0608e5598a92e110e5d3b0

Download Submit
memory/1820-12-0x00007FF9F1F23000-0x00007FF9F1F25000-memory.dmp

Filesize
8KB

Download
memory/1820-13-0x0000000000520000-0x00000000005F6000-memory.dmp

Filesize
856KB

Download

Resubmissions

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

Replay Monitor

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Downloads