darkcomet | 34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f

System Information Discovery

Processes:

mcsft.exe

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

Processes:

34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
1392	mcsft.exe
4572	mcsft.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

mcsft.exe

description	pid	Process	procid_target
PID 1392 set thread context of 4572	1392	mcsft.exe	91

UPX packed file 27 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4572-31-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4572-59-0x0000000000400000-0x00000000004B5000-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

Processes:

34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.execmd.exereg.exemcsft.exemcsft.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.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
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

Processes:

mcsft.exe

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

Processes:

mcsft.exe

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

Suspicious use of AdjustPrivilegeToken 24 IoCs

Processes:

mcsft.exe

description	pid	Process
Token: SeIncreaseQuotaPrivilege	4572	mcsft.exe
Token: SeSecurityPrivilege	4572	mcsft.exe
Token: SeTakeOwnershipPrivilege	4572	mcsft.exe
Token: SeLoadDriverPrivilege	4572	mcsft.exe
Token: SeSystemProfilePrivilege	4572	mcsft.exe
Token: SeSystemtimePrivilege	4572	mcsft.exe
Token: SeProfSingleProcessPrivilege	4572	mcsft.exe
Token: SeIncBasePriorityPrivilege	4572	mcsft.exe
Token: SeCreatePagefilePrivilege	4572	mcsft.exe
Token: SeBackupPrivilege	4572	mcsft.exe
Token: SeRestorePrivilege	4572	mcsft.exe
Token: SeShutdownPrivilege	4572	mcsft.exe
Token: SeDebugPrivilege	4572	mcsft.exe
Token: SeSystemEnvironmentPrivilege	4572	mcsft.exe
Token: SeChangeNotifyPrivilege	4572	mcsft.exe
Token: SeRemoteShutdownPrivilege	4572	mcsft.exe
Token: SeUndockPrivilege	4572	mcsft.exe
Token: SeManageVolumePrivilege	4572	mcsft.exe
Token: SeImpersonatePrivilege	4572	mcsft.exe
Token: SeCreateGlobalPrivilege	4572	mcsft.exe
Token: 33	4572	mcsft.exe
Token: 34	4572	mcsft.exe
Token: 35	4572	mcsft.exe
Token: 36	4572	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exemcsft.exemcsft.exe

pid	Process
860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe
1392	mcsft.exe
4572	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 860 wrote to memory of 2600	860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe	85
PID 860 wrote to memory of 2600	860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe	85
PID 860 wrote to memory of 2600	860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe	85
PID 2600 wrote to memory of 2152	2600	cmd.exe	89
PID 2600 wrote to memory of 2152	2600	cmd.exe	89
PID 2600 wrote to memory of 2152	2600	cmd.exe	89
PID 860 wrote to memory of 1392	860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe	90
PID 860 wrote to memory of 1392	860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe	90
PID 860 wrote to memory of 1392	860	34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe	90
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91
PID 1392 wrote to memory of 4572	1392	mcsft.exe	91

C:\Users\Admin\AppData\Local\Temp\34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe
"C:\Users\Admin\AppData\Local\Temp\34de6f19f842b597b5461a76bbb08d5385c8ebd556936ab950b58e3c3fb1d25f.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:860
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\BAxJT.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2600
- - 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:2152
- 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:1392
- - 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:4572

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