darkcomet | cb28ecac74c56904ec99674c0d5c7c7cc130f68e59fd63188aeda8121a4b4a24

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:

58ff732146073478474977c9378bc760_NEAS.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3726321484-1950364574-433157660-1000\Control Panel\International\Geo\Nation	58ff732146073478474977c9378bc760_NEAS.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
2504	mcsft.exe
4300	mcsft.exe

UPX packed file 31 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4312-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/files/0x000c000000023bab-16.dat	upx
behavioral2/memory/4312-29-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/2504-32-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/4300-33-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2504-39-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/4300-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/4300-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-3726321484-1950364574-433157660-1000\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 2504 set thread context of 4300	2504	mcsft.exe	90

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

Processes:

mcsft.exe

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

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	4300	mcsft.exe
Token: SeSecurityPrivilege	4300	mcsft.exe
Token: SeTakeOwnershipPrivilege	4300	mcsft.exe
Token: SeLoadDriverPrivilege	4300	mcsft.exe
Token: SeSystemProfilePrivilege	4300	mcsft.exe
Token: SeSystemtimePrivilege	4300	mcsft.exe
Token: SeProfSingleProcessPrivilege	4300	mcsft.exe
Token: SeIncBasePriorityPrivilege	4300	mcsft.exe
Token: SeCreatePagefilePrivilege	4300	mcsft.exe
Token: SeBackupPrivilege	4300	mcsft.exe
Token: SeRestorePrivilege	4300	mcsft.exe
Token: SeShutdownPrivilege	4300	mcsft.exe
Token: SeDebugPrivilege	4300	mcsft.exe
Token: SeSystemEnvironmentPrivilege	4300	mcsft.exe
Token: SeChangeNotifyPrivilege	4300	mcsft.exe
Token: SeRemoteShutdownPrivilege	4300	mcsft.exe
Token: SeUndockPrivilege	4300	mcsft.exe
Token: SeManageVolumePrivilege	4300	mcsft.exe
Token: SeImpersonatePrivilege	4300	mcsft.exe
Token: SeCreateGlobalPrivilege	4300	mcsft.exe
Token: 33	4300	mcsft.exe
Token: 34	4300	mcsft.exe
Token: 35	4300	mcsft.exe
Token: 36	4300	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

58ff732146073478474977c9378bc760_NEAS.exemcsft.exemcsft.exe

pid	Process
4312	58ff732146073478474977c9378bc760_NEAS.exe
2504	mcsft.exe
4300	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

58ff732146073478474977c9378bc760_NEAS.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 4312 wrote to memory of 3372	4312	58ff732146073478474977c9378bc760_NEAS.exe	85
PID 4312 wrote to memory of 3372	4312	58ff732146073478474977c9378bc760_NEAS.exe	85
PID 4312 wrote to memory of 3372	4312	58ff732146073478474977c9378bc760_NEAS.exe	85
PID 3372 wrote to memory of 3168	3372	cmd.exe	88
PID 3372 wrote to memory of 3168	3372	cmd.exe	88
PID 3372 wrote to memory of 3168	3372	cmd.exe	88
PID 4312 wrote to memory of 2504	4312	58ff732146073478474977c9378bc760_NEAS.exe	89
PID 4312 wrote to memory of 2504	4312	58ff732146073478474977c9378bc760_NEAS.exe	89
PID 4312 wrote to memory of 2504	4312	58ff732146073478474977c9378bc760_NEAS.exe	89
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90
PID 2504 wrote to memory of 4300	2504	mcsft.exe	90

C:\Users\Admin\AppData\Local\Temp\58ff732146073478474977c9378bc760_NEAS.exe
"C:\Users\Admin\AppData\Local\Temp\58ff732146073478474977c9378bc760_NEAS.exe"
1⤵
- Checks computer location settings
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4312
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\orMHG.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3372
- - 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:3168
- 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:2504
- - 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:4300

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