darkcomet | cb28ecac74c56904ec99674c0d5c7c7cc130f68e59fd63188aeda8121a4b4a24

System Information Discovery

Processes:

mcsft.exe

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

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
2652	mcsft.exe
2396	mcsft.exe

Loads dropped DLL 6 IoCs

Processes:

58ff732146073478474977c9378bc760_NEAS.exemcsft.exe

pid	Process
2164	58ff732146073478474977c9378bc760_NEAS.exe
2164	58ff732146073478474977c9378bc760_NEAS.exe
2164	58ff732146073478474977c9378bc760_NEAS.exe
2164	58ff732146073478474977c9378bc760_NEAS.exe
2164	58ff732146073478474977c9378bc760_NEAS.exe
2652	mcsft.exe

UPX packed file 31 IoCs

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

upx

Processes:

resource	yara_rule
behavioral1/memory/2164-2-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/files/0x0036000000015d6b-40.dat	upx
behavioral1/memory/2164-44-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2652-46-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2396-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2652-56-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2396-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-63-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2164-65-0x0000000003AA0000-0x0000000003E68000-memory.dmp	upx
behavioral1/memory/2396-66-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-67-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-69-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-71-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-73-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-74-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-75-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-76-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-77-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-78-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2396-79-0x0000000000400000-0x00000000004B5000-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-1-5-21-3452737119-3959686427-228443150-1000\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 2652 set thread context of 2396	2652	mcsft.exe	32

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 23 IoCs

Processes:

mcsft.exe

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2396	mcsft.exe
Token: SeSecurityPrivilege	2396	mcsft.exe
Token: SeTakeOwnershipPrivilege	2396	mcsft.exe
Token: SeLoadDriverPrivilege	2396	mcsft.exe
Token: SeSystemProfilePrivilege	2396	mcsft.exe
Token: SeSystemtimePrivilege	2396	mcsft.exe
Token: SeProfSingleProcessPrivilege	2396	mcsft.exe
Token: SeIncBasePriorityPrivilege	2396	mcsft.exe
Token: SeCreatePagefilePrivilege	2396	mcsft.exe
Token: SeBackupPrivilege	2396	mcsft.exe
Token: SeRestorePrivilege	2396	mcsft.exe
Token: SeShutdownPrivilege	2396	mcsft.exe
Token: SeDebugPrivilege	2396	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2396	mcsft.exe
Token: SeChangeNotifyPrivilege	2396	mcsft.exe
Token: SeRemoteShutdownPrivilege	2396	mcsft.exe
Token: SeUndockPrivilege	2396	mcsft.exe
Token: SeManageVolumePrivilege	2396	mcsft.exe
Token: SeImpersonatePrivilege	2396	mcsft.exe
Token: SeCreateGlobalPrivilege	2396	mcsft.exe
Token: 33	2396	mcsft.exe
Token: 34	2396	mcsft.exe
Token: 35	2396	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

58ff732146073478474977c9378bc760_NEAS.exemcsft.exemcsft.exe

pid	Process
2164	58ff732146073478474977c9378bc760_NEAS.exe
2652	mcsft.exe
2396	mcsft.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

58ff732146073478474977c9378bc760_NEAS.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 2164 wrote to memory of 2632	2164	58ff732146073478474977c9378bc760_NEAS.exe	28
PID 2164 wrote to memory of 2632	2164	58ff732146073478474977c9378bc760_NEAS.exe	28
PID 2164 wrote to memory of 2632	2164	58ff732146073478474977c9378bc760_NEAS.exe	28
PID 2164 wrote to memory of 2632	2164	58ff732146073478474977c9378bc760_NEAS.exe	28
PID 2632 wrote to memory of 2528	2632	cmd.exe	30
PID 2632 wrote to memory of 2528	2632	cmd.exe	30
PID 2632 wrote to memory of 2528	2632	cmd.exe	30
PID 2632 wrote to memory of 2528	2632	cmd.exe	30
PID 2164 wrote to memory of 2652	2164	58ff732146073478474977c9378bc760_NEAS.exe	31
PID 2164 wrote to memory of 2652	2164	58ff732146073478474977c9378bc760_NEAS.exe	31
PID 2164 wrote to memory of 2652	2164	58ff732146073478474977c9378bc760_NEAS.exe	31
PID 2164 wrote to memory of 2652	2164	58ff732146073478474977c9378bc760_NEAS.exe	31
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32
PID 2652 wrote to memory of 2396	2652	mcsft.exe	32

C:\Users\Admin\AppData\Local\Temp\58ff732146073478474977c9378bc760_NEAS.exe
"C:\Users\Admin\AppData\Local\Temp\58ff732146073478474977c9378bc760_NEAS.exe"
1⤵
- Loads dropped DLL
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:2164
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\AQucP.bat" "
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2632
- - 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:2528
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Loads dropped DLL
  - Suspicious use of SetThreadContext
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2652
- - 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:2396

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

3

System Information Discovery

4