darkcomet | c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Windupdt\\winupdate.exe"	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe

Modifies firewall policy service 2 TTPs 3 IoCs

Modify Registry

Modify Existing Service

T1031

description	ioc	Process
Key created	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile	winupdate.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\EnableFirewall = "1"	winupdate.exe
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\SharedAccess\Parameters\FirewallPolicy\StandardProfile\DisableNotifications = "1"	winupdate.exe

Modifies security service 2 TTPs 1 IoCs

Modify Registry

Modify Existing Service

T1031

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\wscsvc\Start = "4"	winupdate.exe

Windows security bypass 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	winupdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	winupdate.exe

Disables RegEdit via registry modification 1 IoCs

description	ioc	Process
Set value (int)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Policies\System\DisableRegistryTools = "1"	winupdate.exe

Disables Task Manager via registry modification
evasion

Executes dropped EXE 1 IoCs

pid	Process
1688	winupdate.exe

UPX packed file 10 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/1088-55-0x0000000000400000-0x00000000004F8000-memory.dmp	upx
behavioral1/files/0x000b0000000122c2-56.dat	upx
behavioral1/files/0x000b0000000122c2-59.dat	upx
behavioral1/files/0x000b0000000122c2-61.dat	upx
behavioral1/files/0x000b0000000122c2-63.dat	upx
behavioral1/files/0x000b0000000122c2-64.dat	upx
behavioral1/files/0x000b0000000122c2-65.dat	upx
behavioral1/memory/1088-66-0x0000000000400000-0x00000000004F8000-memory.dmp	upx
behavioral1/memory/1688-69-0x0000000000400000-0x00000000004F8000-memory.dmp	upx
behavioral1/memory/1688-71-0x0000000000400000-0x00000000004F8000-memory.dmp	upx

Checks BIOS information in registry 2 TTPs 2 IoCs

BIOS information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	winupdate.exe

Deletes itself 1 IoCs

pid	Process
1628	cmd.exe

Loads dropped DLL 4 IoCs

pid	Process
1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
1688	winupdate.exe
1688	winupdate.exe
1688	winupdate.exe

Windows security modification 2 TTPs 2 IoCs

evasion trojan

Disabling Security Tools

T1089

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	winupdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Wow6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	winupdate.exe

Adds Run key to start application 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run\winupdater = "C:\\Windupdt\\winupdate.exe"	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run	winupdate.exe
Key created	\REGISTRY\USER\S-1-5-21-999675638-2867687379-27515722-1000\Software\Microsoft\Windows\CurrentVersion\Run	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe

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

System Information Discovery
T1082

Checks processor information in registry 2 TTPs 8 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	winupdate.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	winupdate.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	winupdate.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	winupdate.exe

Enumerates system info in registry 2 TTPs 2 IoCs

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	winupdate.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
288	PING.EXE

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1688	winupdate.exe

Suspicious use of AdjustPrivilegeToken 46 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeSecurityPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeTakeOwnershipPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeLoadDriverPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeSystemProfilePrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeSystemtimePrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeProfSingleProcessPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeIncBasePriorityPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeCreatePagefilePrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeBackupPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeRestorePrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeShutdownPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeDebugPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeSystemEnvironmentPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeChangeNotifyPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeRemoteShutdownPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeUndockPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeManageVolumePrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeImpersonatePrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeCreateGlobalPrivilege	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: 33	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: 34	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: 35	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
Token: SeIncreaseQuotaPrivilege	1688	winupdate.exe
Token: SeSecurityPrivilege	1688	winupdate.exe
Token: SeTakeOwnershipPrivilege	1688	winupdate.exe
Token: SeLoadDriverPrivilege	1688	winupdate.exe
Token: SeSystemProfilePrivilege	1688	winupdate.exe
Token: SeSystemtimePrivilege	1688	winupdate.exe
Token: SeProfSingleProcessPrivilege	1688	winupdate.exe
Token: SeIncBasePriorityPrivilege	1688	winupdate.exe
Token: SeCreatePagefilePrivilege	1688	winupdate.exe
Token: SeBackupPrivilege	1688	winupdate.exe
Token: SeRestorePrivilege	1688	winupdate.exe
Token: SeShutdownPrivilege	1688	winupdate.exe
Token: SeDebugPrivilege	1688	winupdate.exe
Token: SeSystemEnvironmentPrivilege	1688	winupdate.exe
Token: SeChangeNotifyPrivilege	1688	winupdate.exe
Token: SeRemoteShutdownPrivilege	1688	winupdate.exe
Token: SeUndockPrivilege	1688	winupdate.exe
Token: SeManageVolumePrivilege	1688	winupdate.exe
Token: SeImpersonatePrivilege	1688	winupdate.exe
Token: SeCreateGlobalPrivilege	1688	winupdate.exe
Token: 33	1688	winupdate.exe
Token: 34	1688	winupdate.exe
Token: 35	1688	winupdate.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1688	winupdate.exe

Suspicious use of WriteProcessMemory 15 IoCs

description	pid	Process	procid_target
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1688	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	26
PID 1088 wrote to memory of 1628	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	27
PID 1088 wrote to memory of 1628	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	27
PID 1088 wrote to memory of 1628	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	27
PID 1088 wrote to memory of 1628	1088	c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe	27
PID 1628 wrote to memory of 288	1628	cmd.exe	29
PID 1628 wrote to memory of 288	1628	cmd.exe	29
PID 1628 wrote to memory of 288	1628	cmd.exe	29
PID 1628 wrote to memory of 288	1628	cmd.exe	29

System policy modification 1 TTPs 3 IoCs

Modify Registry

description	ioc	Process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion	winupdate.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern	winupdate.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\CurrentVersion\Explorern\NoControlPanel = "1"	winupdate.exe

C:\Users\Admin\AppData\Local\Temp\c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe
"C:\Users\Admin\AppData\Local\Temp\c2bc9d90cf7c07e8a7fbf0e95ee6f2f498bf7013af1244b56bbec2710a62447c.exe"
1⤵
- Modifies WinLogon for persistence
- Checks BIOS information in registry
- Loads dropped DLL
- Adds Run key to start application
- Checks processor information in registry
- Enumerates system info in registry
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1088
- C:\Windupdt\winupdate.exe
  "C:\Windupdt\winupdate.exe"
  2⤵
  - Modifies firewall policy service
  - Modifies security service
  - Windows security bypass
  - Disables RegEdit via registry modification
  - Executes dropped EXE
  - Checks BIOS information in registry
  - Loads dropped DLL
  - Windows security modification
  - Adds Run key to start application
  - Checks processor information in registry
  - Enumerates system info in registry
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - System policy modification
  PID:1688
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\_dcsc_.bat" "
  2⤵
  - Deletes itself
  - Suspicious use of WriteProcessMemory
  PID:1628
- - C:\Windows\SysWOW64\PING.EXE
    ping 127.0.0.1 -n 2
    3⤵
    - Runs ping.exe
    PID:288

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Modify Existing Service

T1031

Registry Run Keys / Startup Folder

T1060

Winlogon Helper DLL

T1004

Privilege Escalation

Defense Evasion

Disabling Security Tools

T1089

Modify Registry

Credential Access

Discovery

Query Registry

Remote System Discovery

T1018

System Information Discovery