darkcomet | 48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce

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:

48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2045521122-590294423-3465680274-1000\Control Panel\International\Geo\Nation	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
2248	mcsft.exe
1668	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-1-5-21-2045521122-590294423-3465680274-1000\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 2248 set thread context of 1668	2248	mcsft.exe	90

UPX packed file 29 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/1092-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/files/0x0008000000023c85-16.dat	upx
behavioral2/memory/1092-29-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/1668-32-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2248-35-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral2/memory/1668-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-45-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-46-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-48-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-50-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-54-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-56-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/1668-60-0x0000000000400000-0x00000000004B5000-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:

48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.execmd.exereg.exemcsft.exemcsft.exe

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.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	1668	mcsft.exe
Token: SeSecurityPrivilege	1668	mcsft.exe
Token: SeTakeOwnershipPrivilege	1668	mcsft.exe
Token: SeLoadDriverPrivilege	1668	mcsft.exe
Token: SeSystemProfilePrivilege	1668	mcsft.exe
Token: SeSystemtimePrivilege	1668	mcsft.exe
Token: SeProfSingleProcessPrivilege	1668	mcsft.exe
Token: SeIncBasePriorityPrivilege	1668	mcsft.exe
Token: SeCreatePagefilePrivilege	1668	mcsft.exe
Token: SeBackupPrivilege	1668	mcsft.exe
Token: SeRestorePrivilege	1668	mcsft.exe
Token: SeShutdownPrivilege	1668	mcsft.exe
Token: SeDebugPrivilege	1668	mcsft.exe
Token: SeSystemEnvironmentPrivilege	1668	mcsft.exe
Token: SeChangeNotifyPrivilege	1668	mcsft.exe
Token: SeRemoteShutdownPrivilege	1668	mcsft.exe
Token: SeUndockPrivilege	1668	mcsft.exe
Token: SeManageVolumePrivilege	1668	mcsft.exe
Token: SeImpersonatePrivilege	1668	mcsft.exe
Token: SeCreateGlobalPrivilege	1668	mcsft.exe
Token: 33	1668	mcsft.exe
Token: 34	1668	mcsft.exe
Token: 35	1668	mcsft.exe
Token: 36	1668	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exemcsft.exemcsft.exe

pid	Process
1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe
2248	mcsft.exe
1668	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 1092 wrote to memory of 3912	1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe	85
PID 1092 wrote to memory of 3912	1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe	85
PID 1092 wrote to memory of 3912	1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe	85
PID 3912 wrote to memory of 1312	3912	cmd.exe	88
PID 3912 wrote to memory of 1312	3912	cmd.exe	88
PID 3912 wrote to memory of 1312	3912	cmd.exe	88
PID 1092 wrote to memory of 2248	1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe	89
PID 1092 wrote to memory of 2248	1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe	89
PID 1092 wrote to memory of 2248	1092	48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe	89
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90
PID 2248 wrote to memory of 1668	2248	mcsft.exe	90

C:\Users\Admin\AppData\Local\Temp\48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe
"C:\Users\Admin\AppData\Local\Temp\48e5a4a16442945adb5523b5ea5bd19d71a1eb8c5d66e7ec92f0999b8e37dcce.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1092
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\EDolk.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3912
- - 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:1312
- 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:2248
- - 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:1668

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