darkcomet | 3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a

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-1-5-21-250031470-1197856012-2659781506-1000\Control Panel\International\Geo\Nation	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe

Executes dropped EXE 3 IoCs

pid	Process
3660	mcsft.exe
460	mcsft.exe
4020	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-1-5-21-250031470-1197856012-2659781506-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 2 IoCs

description	pid	Process	procid_target
PID 3660 set thread context of 460	3660	mcsft.exe	91
PID 3660 set thread context of 4020	3660	mcsft.exe	92

UPX packed file 34 IoCs

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

upx

resource	yara_rule
behavioral2/memory/1372-0-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/files/0x000d000000023bfd-15.dat	upx
behavioral2/memory/3660-28-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/memory/1372-30-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/memory/460-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-33-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4020-38-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/4020-41-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/4020-43-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/3660-46-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/memory/460-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4020-54-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/460-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-66-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-74-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-76-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-78-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-80-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/460-82-0x0000000000400000-0x00000000004B5000-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 6 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	mcsft.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.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 25 IoCs

description	pid	Process
Token: SeDebugPrivilege	4020	mcsft.exe
Token: SeIncreaseQuotaPrivilege	460	mcsft.exe
Token: SeSecurityPrivilege	460	mcsft.exe
Token: SeTakeOwnershipPrivilege	460	mcsft.exe
Token: SeLoadDriverPrivilege	460	mcsft.exe
Token: SeSystemProfilePrivilege	460	mcsft.exe
Token: SeSystemtimePrivilege	460	mcsft.exe
Token: SeProfSingleProcessPrivilege	460	mcsft.exe
Token: SeIncBasePriorityPrivilege	460	mcsft.exe
Token: SeCreatePagefilePrivilege	460	mcsft.exe
Token: SeBackupPrivilege	460	mcsft.exe
Token: SeRestorePrivilege	460	mcsft.exe
Token: SeShutdownPrivilege	460	mcsft.exe
Token: SeDebugPrivilege	460	mcsft.exe
Token: SeSystemEnvironmentPrivilege	460	mcsft.exe
Token: SeChangeNotifyPrivilege	460	mcsft.exe
Token: SeRemoteShutdownPrivilege	460	mcsft.exe
Token: SeUndockPrivilege	460	mcsft.exe
Token: SeManageVolumePrivilege	460	mcsft.exe
Token: SeImpersonatePrivilege	460	mcsft.exe
Token: SeCreateGlobalPrivilege	460	mcsft.exe
Token: 33	460	mcsft.exe
Token: 34	460	mcsft.exe
Token: 35	460	mcsft.exe
Token: 36	460	mcsft.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe
3660	mcsft.exe
4020	mcsft.exe
460	mcsft.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 1372 wrote to memory of 2656	1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe	86
PID 1372 wrote to memory of 2656	1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe	86
PID 1372 wrote to memory of 2656	1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe	86
PID 2656 wrote to memory of 4036	2656	cmd.exe	89
PID 2656 wrote to memory of 4036	2656	cmd.exe	89
PID 2656 wrote to memory of 4036	2656	cmd.exe	89
PID 1372 wrote to memory of 3660	1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe	90
PID 1372 wrote to memory of 3660	1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe	90
PID 1372 wrote to memory of 3660	1372	3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe	90
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 460	3660	mcsft.exe	91
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92
PID 3660 wrote to memory of 4020	3660	mcsft.exe	92

C:\Users\Admin\AppData\Local\Temp\3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe
"C:\Users\Admin\AppData\Local\Temp\3ff1c7d87a0a6c981923823c4bc4fbb00c9812ea14c7dbd2439864121b9d718a.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1372
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\gTSNl.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2656
- - 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:4036
- 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:3660
- - 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:460
- - C:\Users\Admin\AppData\Roaming\mcsft.exe
    C:\Users\Admin\AppData\Roaming\mcsft.exe
    3⤵
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:4020

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