darkcomet | 590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7

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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe

Executes dropped EXE 3 IoCs

pid	Process
3948	mcsft.exe
4128	mcsft.exe
3428	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-1-5-21-2437139445-1151884604-3026847218-1000\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 3948 set thread context of 4128	3948	mcsft.exe	88
PID 3948 set thread context of 3428	3948	mcsft.exe	89

UPX packed file 36 IoCs

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

upx

resource	yara_rule
behavioral2/memory/652-0-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/files/0x000b000000023b7a-16.dat	upx
behavioral2/memory/3948-28-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/memory/652-30-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/memory/4128-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-33-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3428-45-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/3428-50-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/3428-48-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/3948-54-0x0000000000400000-0x00000000007EA000-memory.dmp	upx
behavioral2/memory/4128-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3428-59-0x0000000000400000-0x0000000000409000-memory.dmp	upx
behavioral2/memory/4128-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-63-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-65-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-67-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-69-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-71-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-73-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-75-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-77-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-79-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-81-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-83-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4128-85-0x0000000000400000-0x00000000004B5000-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	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.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: SeIncreaseQuotaPrivilege	4128	mcsft.exe
Token: SeSecurityPrivilege	4128	mcsft.exe
Token: SeTakeOwnershipPrivilege	4128	mcsft.exe
Token: SeLoadDriverPrivilege	4128	mcsft.exe
Token: SeSystemProfilePrivilege	4128	mcsft.exe
Token: SeSystemtimePrivilege	4128	mcsft.exe
Token: SeProfSingleProcessPrivilege	4128	mcsft.exe
Token: SeIncBasePriorityPrivilege	4128	mcsft.exe
Token: SeCreatePagefilePrivilege	4128	mcsft.exe
Token: SeBackupPrivilege	4128	mcsft.exe
Token: SeRestorePrivilege	4128	mcsft.exe
Token: SeShutdownPrivilege	4128	mcsft.exe
Token: SeDebugPrivilege	4128	mcsft.exe
Token: SeSystemEnvironmentPrivilege	4128	mcsft.exe
Token: SeChangeNotifyPrivilege	4128	mcsft.exe
Token: SeRemoteShutdownPrivilege	4128	mcsft.exe
Token: SeUndockPrivilege	4128	mcsft.exe
Token: SeManageVolumePrivilege	4128	mcsft.exe
Token: SeImpersonatePrivilege	4128	mcsft.exe
Token: SeCreateGlobalPrivilege	4128	mcsft.exe
Token: 33	4128	mcsft.exe
Token: 34	4128	mcsft.exe
Token: 35	4128	mcsft.exe
Token: 36	4128	mcsft.exe
Token: SeDebugPrivilege	3428	mcsft.exe

Suspicious use of SetWindowsHookEx 4 IoCs

pid	Process
652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe
3948	mcsft.exe
4128	mcsft.exe
3428	mcsft.exe

Suspicious use of WriteProcessMemory 25 IoCs

description	pid	Process	procid_target
PID 652 wrote to memory of 1180	652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe	83
PID 652 wrote to memory of 1180	652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe	83
PID 652 wrote to memory of 1180	652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe	83
PID 1180 wrote to memory of 1416	1180	cmd.exe	86
PID 1180 wrote to memory of 1416	1180	cmd.exe	86
PID 1180 wrote to memory of 1416	1180	cmd.exe	86
PID 652 wrote to memory of 3948	652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe	87
PID 652 wrote to memory of 3948	652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe	87
PID 652 wrote to memory of 3948	652	590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe	87
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 4128	3948	mcsft.exe	88
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89
PID 3948 wrote to memory of 3428	3948	mcsft.exe	89

C:\Users\Admin\AppData\Local\Temp\590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe
"C:\Users\Admin\AppData\Local\Temp\590df6fdad528c23590f0ff391995221d794ff1cb8a310edf71a274b1dd0b9b7.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:652
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\KJEDn.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1180
- - 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:1416
- 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:3948
- - 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:4128
- - 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:3428

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