darkcomet | b7cb1446ed8bd8fb97d466e3227a9f932bf6c7b5372e817fd3eb8a938fdda4f7

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-1-5-21-3027552071-446050021-1254071215-1000\Control Panel\International\Geo\Nation	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe

Executes dropped EXE 2 IoCs

pid	Process
2864	mcsft.exe
1708	mcsft.exe

UPX packed file 32 IoCs

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

upx

resource	yara_rule
behavioral2/memory/3656-0-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/files/0x000b000000023106-16.dat	upx
behavioral2/files/0x000c000000023108-26.dat	upx
behavioral2/files/0x000c000000023108-27.dat	upx
behavioral2/memory/3656-29-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/1708-31-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/files/0x000c000000023108-32.dat	upx
behavioral2/memory/1708-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2864-35-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/1708-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1708-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

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-1-5-21-3027552071-446050021-1254071215-1000\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 2864 set thread context of 1708	2864	mcsft.exe	91

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

System Information Discovery
T1082

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 value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	mcsft.exe
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

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	1708	mcsft.exe
Token: SeSecurityPrivilege	1708	mcsft.exe
Token: SeTakeOwnershipPrivilege	1708	mcsft.exe
Token: SeLoadDriverPrivilege	1708	mcsft.exe
Token: SeSystemProfilePrivilege	1708	mcsft.exe
Token: SeSystemtimePrivilege	1708	mcsft.exe
Token: SeProfSingleProcessPrivilege	1708	mcsft.exe
Token: SeIncBasePriorityPrivilege	1708	mcsft.exe
Token: SeCreatePagefilePrivilege	1708	mcsft.exe
Token: SeBackupPrivilege	1708	mcsft.exe
Token: SeRestorePrivilege	1708	mcsft.exe
Token: SeShutdownPrivilege	1708	mcsft.exe
Token: SeDebugPrivilege	1708	mcsft.exe
Token: SeSystemEnvironmentPrivilege	1708	mcsft.exe
Token: SeChangeNotifyPrivilege	1708	mcsft.exe
Token: SeRemoteShutdownPrivilege	1708	mcsft.exe
Token: SeUndockPrivilege	1708	mcsft.exe
Token: SeManageVolumePrivilege	1708	mcsft.exe
Token: SeImpersonatePrivilege	1708	mcsft.exe
Token: SeCreateGlobalPrivilege	1708	mcsft.exe
Token: 33	1708	mcsft.exe
Token: 34	1708	mcsft.exe
Token: 35	1708	mcsft.exe
Token: 36	1708	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe
2864	mcsft.exe
1708	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 3656 wrote to memory of 3964	3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe	86
PID 3656 wrote to memory of 3964	3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe	86
PID 3656 wrote to memory of 3964	3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe	86
PID 3964 wrote to memory of 4484	3964	cmd.exe	89
PID 3964 wrote to memory of 4484	3964	cmd.exe	89
PID 3964 wrote to memory of 4484	3964	cmd.exe	89
PID 3656 wrote to memory of 2864	3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe	90
PID 3656 wrote to memory of 2864	3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe	90
PID 3656 wrote to memory of 2864	3656	NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe	90
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91
PID 2864 wrote to memory of 1708	2864	mcsft.exe	91

C:\Users\Admin\AppData\Local\Temp\NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe
"C:\Users\Admin\AppData\Local\Temp\NEAS.6d7df5d3e5959e6e6a8035329f86b490.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:3656
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\kdork.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3964
- - 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
    PID:4484
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2864
- - C:\Users\Admin\AppData\Roaming\mcsft.exe
    C:\Users\Admin\AppData\Roaming\mcsft.exe
    3⤵
    - Checks BIOS information in registry
    - Executes dropped EXE
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:1708

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