darkcomet | 25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be

System Information Discovery

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

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

System Information Discovery

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe

Executes dropped EXE 2 IoCs

pid	Process
436	mcsft.exe
3496	mcsft.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 436 set thread context of 3496	436	mcsft.exe	87

UPX packed file 29 IoCs

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

upx

resource	yara_rule
behavioral2/memory/2616-0-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/files/0x0008000000023cbe-16.dat	upx
behavioral2/memory/2616-28-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/3496-31-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/436-40-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/3496-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3496-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

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 5 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

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.exe

Checks processor information in registry 2 TTPs 4 IoCs

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

Query Registry

System Information Discovery

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

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry

System Information Discovery

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

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3496	mcsft.exe
Token: SeSecurityPrivilege	3496	mcsft.exe
Token: SeTakeOwnershipPrivilege	3496	mcsft.exe
Token: SeLoadDriverPrivilege	3496	mcsft.exe
Token: SeSystemProfilePrivilege	3496	mcsft.exe
Token: SeSystemtimePrivilege	3496	mcsft.exe
Token: SeProfSingleProcessPrivilege	3496	mcsft.exe
Token: SeIncBasePriorityPrivilege	3496	mcsft.exe
Token: SeCreatePagefilePrivilege	3496	mcsft.exe
Token: SeBackupPrivilege	3496	mcsft.exe
Token: SeRestorePrivilege	3496	mcsft.exe
Token: SeShutdownPrivilege	3496	mcsft.exe
Token: SeDebugPrivilege	3496	mcsft.exe
Token: SeSystemEnvironmentPrivilege	3496	mcsft.exe
Token: SeChangeNotifyPrivilege	3496	mcsft.exe
Token: SeRemoteShutdownPrivilege	3496	mcsft.exe
Token: SeUndockPrivilege	3496	mcsft.exe
Token: SeManageVolumePrivilege	3496	mcsft.exe
Token: SeImpersonatePrivilege	3496	mcsft.exe
Token: SeCreateGlobalPrivilege	3496	mcsft.exe
Token: 33	3496	mcsft.exe
Token: 34	3496	mcsft.exe
Token: 35	3496	mcsft.exe
Token: 36	3496	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
436	mcsft.exe
3496	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 2616 wrote to memory of 3192	2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	82
PID 2616 wrote to memory of 3192	2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	82
PID 2616 wrote to memory of 3192	2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	82
PID 3192 wrote to memory of 3628	3192	cmd.exe	85
PID 3192 wrote to memory of 3628	3192	cmd.exe	85
PID 3192 wrote to memory of 3628	3192	cmd.exe	85
PID 2616 wrote to memory of 436	2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	86
PID 2616 wrote to memory of 436	2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	86
PID 2616 wrote to memory of 436	2616	25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe	86
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87
PID 436 wrote to memory of 3496	436	mcsft.exe	87

C:\Users\Admin\AppData\Local\Temp\25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe
"C:\Users\Admin\AppData\Local\Temp\25cbd75e05da9cc66a050f3107668497de1bb0b4b37f3c65b94f14fba77668be.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2616
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\TDnlk.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3192
- - C:\Windows\SysWOW64\reg.exe
    REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "Mcrosoft" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\mcsft.exe" /f
    3⤵
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    PID:3628
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:436
- - C:\Users\Admin\AppData\Roaming\mcsft.exe
    C:\Users\Admin\AppData\Roaming\mcsft.exe
    3⤵
    - Checks BIOS information in registry
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:3496

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

T1112

Credential Access

Discovery

Query Registry

4

System Information Discovery

5

System Location Discovery

T1614

System Language Discovery