dcrat | c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\dhcpcore\\smss.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\dhcpcore\\smss.exe\", \"C:\\Windows\\System32\\mfc42\\smss.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\dhcpcore\\smss.exe\", \"C:\\Windows\\System32\\mfc42\\smss.exe\", \"C:\\Windows\\System32\\url\\wininit.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\dhcpcore\\smss.exe\", \"C:\\Windows\\System32\\mfc42\\smss.exe\", \"C:\\Windows\\System32\\url\\wininit.exe\", \"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPC\\OSPPSVC.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe

Process spawned unexpected child process 4 IoCs

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

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2868	2768	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3036	2768	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2860	2768	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2908	2768	schtasks.exe	30

UAC bypass 3 TTPs 6 IoCs

evasion trojan

Bypass User Account Control

T1548.002

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	smss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	smss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	smss.exe

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2148-1-0x0000000000320000-0x0000000000414000-memory.dmp	dcrat
behavioral1/files/0x00060000000191d4-23.dat	dcrat
behavioral1/memory/2448-81-0x0000000000380000-0x0000000000474000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2448	smss.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPC\\OSPPSVC.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\OSPPSVC = "\"C:\\Program Files\\Common Files\\Microsoft Shared\\OfficeSoftwareProtectionPlatform\\OSPPC\\OSPPSVC.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\dhcpcore\\smss.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\dhcpcore\\smss.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\mfc42\\smss.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\smss = "\"C:\\Windows\\System32\\mfc42\\smss.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-1846800975-3917212583-2893086201-1000\Software\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Windows\\System32\\url\\wininit.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\wininit = "\"C:\\Windows\\System32\\url\\wininit.exe\""	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	smss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	smss.exe

Drops file in System32 directory 15 IoCs

description	ioc	Process
File created	C:\Windows\System32\url\560854153607923c4c5f107085a7db67be01f252	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\dhcpcore\RCXBB17.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\mfc42\RCXBD89.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\url\RCXBF8F.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\url\wininit.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File created	C:\Windows\System32\dhcpcore\69ddcba757bf72f7d36c464c71f42baab150b2b9	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File created	C:\Windows\System32\mfc42\69ddcba757bf72f7d36c464c71f42baab150b2b9	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File created	C:\Windows\System32\dhcpcore\smss.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File created	C:\Windows\System32\url\wininit.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\mfc42\smss.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\url\RCXBF8E.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\dhcpcore\smss.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File created	C:\Windows\System32\mfc42\smss.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\dhcpcore\RCXBB18.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Windows\System32\mfc42\RCXBD8A.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File created	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\1610b97d3ab4a74cd8ae104b51bea7bfcc5b9c6f	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\RCXC193.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\RCXC194.tmp	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
File opened for modification	C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

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

persistence execution

Scheduled Task

pid	Process
2868	schtasks.exe
3036	schtasks.exe
2860	schtasks.exe
2908	schtasks.exe

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
2148	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2148	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Token: SeDebugPrivilege	2448	smss.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 2148 wrote to memory of 2712	2148	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe	35
PID 2148 wrote to memory of 2712	2148	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe	35
PID 2148 wrote to memory of 2712	2148	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe	35
PID 2712 wrote to memory of 1496	2712	cmd.exe	37
PID 2712 wrote to memory of 1496	2712	cmd.exe	37
PID 2712 wrote to memory of 1496	2712	cmd.exe	37
PID 2712 wrote to memory of 2448	2712	cmd.exe	39
PID 2712 wrote to memory of 2448	2712	cmd.exe	39
PID 2712 wrote to memory of 2448	2712	cmd.exe	39

System policy modification 1 TTPs 6 IoCs

evasion

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	smss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	smss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	smss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.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\c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe
"C:\Users\Admin\AppData\Local\Temp\c844c4574183306af2f9cd32e43eebeb0a33e5d804391eeda8d5f4fd7c34b717N.exe"
1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2148
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\BILX3c7L9X.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2712
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1496
- - C:\Windows\System32\mfc42\smss.exe
    "C:\Windows\System32\mfc42\smss.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:2448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\dhcpcore\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2868

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\System32\mfc42\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Windows\System32\url\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2860

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OSPPSVC" /sc ONLOGON /tr "'C:\Program Files\Common Files\Microsoft Shared\OfficeSoftwareProtectionPlatform\OSPPC\OSPPSVC.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2908

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Abuse Elevation Control Mechanism

T1548

Bypass User Account Control

T1548.002

Impair Defenses

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

T1012

System Information Discovery