dcrat | 92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\mmres\\spoolsv.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\mmres\\spoolsv.exe\", \"C:\\Windows\\System32\\C_20105\\taskhost.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\mmres\\spoolsv.exe\", \"C:\\Windows\\System32\\C_20105\\taskhost.exe\", \"C:\\Windows\\System32\\DXPTaskRingtone\\sppsvc.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\mmres\\spoolsv.exe\", \"C:\\Windows\\System32\\C_20105\\taskhost.exe\", \"C:\\Windows\\System32\\DXPTaskRingtone\\sppsvc.exe\", \"C:\\Users\\All Users\\Desktop\\dwm.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.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	2872	2748	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2736	2748	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2772	2748	schtasks.exe	30
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2648	2748	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\PromptOnSecureDesktop = "0"	sppsvc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	sppsvc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	sppsvc.exe

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2380-1-0x0000000000FF0000-0x00000000010E4000-memory.dmp	dcrat
behavioral1/files/0x00060000000193c9-23.dat	dcrat
behavioral1/files/0x000a0000000165b6-67.dat	dcrat
behavioral1/memory/1700-79-0x0000000000A90000-0x0000000000B84000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1700	sppsvc.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-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\mmres\\spoolsv.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\spoolsv = "\"C:\\Windows\\System32\\mmres\\spoolsv.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\C_20105\\taskhost.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\taskhost = "\"C:\\Windows\\System32\\C_20105\\taskhost.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Windows\\System32\\DXPTaskRingtone\\sppsvc.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sppsvc = "\"C:\\Windows\\System32\\DXPTaskRingtone\\sppsvc.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3533259084-2542256011-65585152-1000\Software\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Users\\All Users\\Desktop\\dwm.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\dwm = "\"C:\\Users\\All Users\\Desktop\\dwm.exe\""	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.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	sppsvc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	sppsvc.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe

Drops file in System32 directory 15 IoCs

description	ioc	Process
File opened for modification	C:\Windows\System32\C_20105\RCX16EF.tmp	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\C_20105\taskhost.exe	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\DXPTaskRingtone\RCX1960.tmp	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\DXPTaskRingtone\RCX1961.tmp	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File created	C:\Windows\System32\C_20105\taskhost.exe	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File created	C:\Windows\System32\C_20105\b75386f1303e64d8139363b71e44ac16341adf4e	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File created	C:\Windows\System32\mmres\f3b6ecef712a24f33798f5d2fb3790c3d9b894c4	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\mmres\RCX147D.tmp	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File created	C:\Windows\System32\mmres\spoolsv.exe	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\mmres\spoolsv.exe	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\C_20105\RCX16EE.tmp	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\mmres\RCX147C.tmp	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File opened for modification	C:\Windows\System32\DXPTaskRingtone\sppsvc.exe	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File created	C:\Windows\System32\DXPTaskRingtone\sppsvc.exe	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
File created	C:\Windows\System32\DXPTaskRingtone\0a1fd5f707cd16ea89afd3d6db52b2da58214a6c	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe

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

System Information Discovery
T1082

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
2772	schtasks.exe
2648	schtasks.exe
2872	schtasks.exe
2736	schtasks.exe

Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

pid	Process
1700	sppsvc.exe

Suspicious behavior: EnumeratesProcesses 3 IoCs

pid	Process
2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Token: SeDebugPrivilege	1700	sppsvc.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 2380 wrote to memory of 1496	2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe	36
PID 2380 wrote to memory of 1496	2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe	36
PID 2380 wrote to memory of 1496	2380	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe	36
PID 1496 wrote to memory of 444	1496	cmd.exe	38
PID 1496 wrote to memory of 444	1496	cmd.exe	38
PID 1496 wrote to memory of 444	1496	cmd.exe	38
PID 1496 wrote to memory of 1700	1496	cmd.exe	39
PID 1496 wrote to memory of 1700	1496	cmd.exe	39
PID 1496 wrote to memory of 1700	1496	cmd.exe	39
PID 1496 wrote to memory of 1700	1496	cmd.exe	39
PID 1496 wrote to memory of 1700	1496	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"	sppsvc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	sppsvc.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\ConsentPromptBehaviorAdmin = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\PromptOnSecureDesktop = "0"	92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	sppsvc.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\92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe
"C:\Users\Admin\AppData\Local\Temp\92d7397217e43be9580e67e5d5568a5252966eea16dd213cae536b8b291c0310.exe"
1⤵
- Modifies WinLogon for persistence
- UAC bypass
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:2380
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\7j1bNpHsSg.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1496
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:444
- - C:\Windows\System32\DXPTaskRingtone\sppsvc.exe
    "C:\Windows\System32\DXPTaskRingtone\sppsvc.exe"
    3⤵
    - UAC bypass
    - Executes dropped EXE
    - Checks whether UAC is enabled
    - Suspicious behavior: CmdExeWriteProcessMemorySpam
    - Suspicious use of AdjustPrivilegeToken
    - System policy modification
    PID:1700

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\System32\mmres\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhost" /sc ONLOGON /tr "'C:\Windows\System32\C_20105\taskhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sppsvc" /sc ONLOGON /tr "'C:\Windows\System32\DXPTaskRingtone\sppsvc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Users\All Users\Desktop\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2648

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