darkcomet | 0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b

System Information Discovery

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

Executes dropped EXE 2 IoCs

pid	Process
2952	mcsft.exe
2724	mcsft.exe

Loads dropped DLL 6 IoCs

pid	Process
108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
2952	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-1-5-21-3692679935-4019334568-335155002-1000\Software\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2952 set thread context of 2724	2952	mcsft.exe	33

UPX packed file 20 IoCs

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

upx

resource	yara_rule
behavioral1/memory/108-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/files/0x0009000000016cd8-27.dat	upx
behavioral1/memory/2952-46-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/108-44-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2952-57-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2724-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-63-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-65-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2724-75-0x0000000000400000-0x00000000004B5000-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

description	ioc	Process
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	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.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 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
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	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 23 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	2724	mcsft.exe
Token: SeSecurityPrivilege	2724	mcsft.exe
Token: SeTakeOwnershipPrivilege	2724	mcsft.exe
Token: SeLoadDriverPrivilege	2724	mcsft.exe
Token: SeSystemProfilePrivilege	2724	mcsft.exe
Token: SeSystemtimePrivilege	2724	mcsft.exe
Token: SeProfSingleProcessPrivilege	2724	mcsft.exe
Token: SeIncBasePriorityPrivilege	2724	mcsft.exe
Token: SeCreatePagefilePrivilege	2724	mcsft.exe
Token: SeBackupPrivilege	2724	mcsft.exe
Token: SeRestorePrivilege	2724	mcsft.exe
Token: SeShutdownPrivilege	2724	mcsft.exe
Token: SeDebugPrivilege	2724	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2724	mcsft.exe
Token: SeChangeNotifyPrivilege	2724	mcsft.exe
Token: SeRemoteShutdownPrivilege	2724	mcsft.exe
Token: SeUndockPrivilege	2724	mcsft.exe
Token: SeManageVolumePrivilege	2724	mcsft.exe
Token: SeImpersonatePrivilege	2724	mcsft.exe
Token: SeCreateGlobalPrivilege	2724	mcsft.exe
Token: 33	2724	mcsft.exe
Token: 34	2724	mcsft.exe
Token: 35	2724	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
2952	mcsft.exe
2724	mcsft.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 108 wrote to memory of 2528	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	29
PID 108 wrote to memory of 2528	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	29
PID 108 wrote to memory of 2528	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	29
PID 108 wrote to memory of 2528	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	29
PID 2528 wrote to memory of 2820	2528	cmd.exe	31
PID 2528 wrote to memory of 2820	2528	cmd.exe	31
PID 2528 wrote to memory of 2820	2528	cmd.exe	31
PID 2528 wrote to memory of 2820	2528	cmd.exe	31
PID 108 wrote to memory of 2952	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	32
PID 108 wrote to memory of 2952	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	32
PID 108 wrote to memory of 2952	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	32
PID 108 wrote to memory of 2952	108	0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe	32
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33
PID 2952 wrote to memory of 2724	2952	mcsft.exe	33

C:\Users\Admin\AppData\Local\Temp\0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe
"C:\Users\Admin\AppData\Local\Temp\0a90b9a4c0bd329080ec50a0e1d70b473f384ed52bcd0c677866cc4b88965b9b.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:108
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\lfWBu.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2528
- - 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:2820
- 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
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2952
- - 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:2724

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

System Location Discovery

T1614

System Language Discovery