darkcomet | e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63

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:

e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid	Process
3032	mcsft.exe
316	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-1-5-21-2437139445-1151884604-3026847218-1000\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 3032 set thread context of 316	3032	mcsft.exe	92

UPX packed file 20 IoCs

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

upx

Processes:

resource	yara_rule
behavioral2/memory/4076-0-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/files/0x000b000000023b73-16.dat	upx
behavioral2/memory/4076-29-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/316-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-31-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-36-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3032-43-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/316-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/316-55-0x0000000000400000-0x00000000004B5000-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:

cmd.exereg.exemcsft.exemcsft.exee3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe

description	ioc	Process
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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.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	316	mcsft.exe
Token: SeSecurityPrivilege	316	mcsft.exe
Token: SeTakeOwnershipPrivilege	316	mcsft.exe
Token: SeLoadDriverPrivilege	316	mcsft.exe
Token: SeSystemProfilePrivilege	316	mcsft.exe
Token: SeSystemtimePrivilege	316	mcsft.exe
Token: SeProfSingleProcessPrivilege	316	mcsft.exe
Token: SeIncBasePriorityPrivilege	316	mcsft.exe
Token: SeCreatePagefilePrivilege	316	mcsft.exe
Token: SeBackupPrivilege	316	mcsft.exe
Token: SeRestorePrivilege	316	mcsft.exe
Token: SeShutdownPrivilege	316	mcsft.exe
Token: SeDebugPrivilege	316	mcsft.exe
Token: SeSystemEnvironmentPrivilege	316	mcsft.exe
Token: SeChangeNotifyPrivilege	316	mcsft.exe
Token: SeRemoteShutdownPrivilege	316	mcsft.exe
Token: SeUndockPrivilege	316	mcsft.exe
Token: SeManageVolumePrivilege	316	mcsft.exe
Token: SeImpersonatePrivilege	316	mcsft.exe
Token: SeCreateGlobalPrivilege	316	mcsft.exe
Token: 33	316	mcsft.exe
Token: 34	316	mcsft.exe
Token: 35	316	mcsft.exe
Token: 36	316	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exemcsft.exemcsft.exe

pid	Process
4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe
3032	mcsft.exe
316	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.execmd.exemcsft.exe

description	pid	Process	procid_target
PID 4076 wrote to memory of 3508	4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe	85
PID 4076 wrote to memory of 3508	4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe	85
PID 4076 wrote to memory of 3508	4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe	85
PID 3508 wrote to memory of 408	3508	cmd.exe	89
PID 3508 wrote to memory of 408	3508	cmd.exe	89
PID 3508 wrote to memory of 408	3508	cmd.exe	89
PID 4076 wrote to memory of 3032	4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe	91
PID 4076 wrote to memory of 3032	4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe	91
PID 4076 wrote to memory of 3032	4076	e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe	91
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92
PID 3032 wrote to memory of 316	3032	mcsft.exe	92

C:\Users\Admin\AppData\Local\Temp\e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe
"C:\Users\Admin\AppData\Local\Temp\e3a163607c77078735e94a225f168dc8efac90e4c112fbaded3881459666fa63N.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4076
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\reXVQ.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3508
- - 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:408
- 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:3032
- - 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:316

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