darkcomet | 21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b

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-1-5-21-940901362-3608833189-1915618603-1000\Control Panel\International\Geo\Nation	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe

Executes dropped EXE 2 IoCs

pid	Process
2436	mcsft.exe
5108	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-1-5-21-940901362-3608833189-1915618603-1000\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 2436 set thread context of 5108	2436	mcsft.exe	91

UPX packed file 22 IoCs

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

upx

resource	yara_rule
behavioral2/memory/644-0-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/files/0x0008000000023cb2-16.dat	upx
behavioral2/memory/2436-28-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/644-29-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/5108-32-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2436-39-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/5108-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/5108-58-0x0000000000400000-0x00000000004B5000-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	reg.exe
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	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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	5108	mcsft.exe
Token: SeSecurityPrivilege	5108	mcsft.exe
Token: SeTakeOwnershipPrivilege	5108	mcsft.exe
Token: SeLoadDriverPrivilege	5108	mcsft.exe
Token: SeSystemProfilePrivilege	5108	mcsft.exe
Token: SeSystemtimePrivilege	5108	mcsft.exe
Token: SeProfSingleProcessPrivilege	5108	mcsft.exe
Token: SeIncBasePriorityPrivilege	5108	mcsft.exe
Token: SeCreatePagefilePrivilege	5108	mcsft.exe
Token: SeBackupPrivilege	5108	mcsft.exe
Token: SeRestorePrivilege	5108	mcsft.exe
Token: SeShutdownPrivilege	5108	mcsft.exe
Token: SeDebugPrivilege	5108	mcsft.exe
Token: SeSystemEnvironmentPrivilege	5108	mcsft.exe
Token: SeChangeNotifyPrivilege	5108	mcsft.exe
Token: SeRemoteShutdownPrivilege	5108	mcsft.exe
Token: SeUndockPrivilege	5108	mcsft.exe
Token: SeManageVolumePrivilege	5108	mcsft.exe
Token: SeImpersonatePrivilege	5108	mcsft.exe
Token: SeCreateGlobalPrivilege	5108	mcsft.exe
Token: 33	5108	mcsft.exe
Token: 34	5108	mcsft.exe
Token: 35	5108	mcsft.exe
Token: 36	5108	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
2436	mcsft.exe
5108	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 644 wrote to memory of 2072	644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	85
PID 644 wrote to memory of 2072	644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	85
PID 644 wrote to memory of 2072	644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	85
PID 2072 wrote to memory of 4856	2072	cmd.exe	89
PID 2072 wrote to memory of 4856	2072	cmd.exe	89
PID 2072 wrote to memory of 4856	2072	cmd.exe	89
PID 644 wrote to memory of 2436	644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	90
PID 644 wrote to memory of 2436	644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	90
PID 644 wrote to memory of 2436	644	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	90
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91
PID 2436 wrote to memory of 5108	2436	mcsft.exe	91

C:\Users\Admin\AppData\Local\Temp\21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
"C:\Users\Admin\AppData\Local\Temp\21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:644
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\JEDnl.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2072
- - 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:4856
- 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:2436
- - 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:5108

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