darkcomet | b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ce

System Information Discovery

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

Executes dropped EXE 2 IoCs

pid	Process
2940	mcsft.exe
2996	mcsft.exe

Loads dropped DLL 6 IoCs

pid	Process
524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
2940	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 2940 set thread context of 2996	2940	mcsft.exe	35

UPX packed file 29 IoCs

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

upx

resource	yara_rule
behavioral1/memory/524-0-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/files/0x0009000000016ace-42.dat	upx
behavioral1/memory/524-44-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2940-46-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2940-56-0x0000000000400000-0x00000000007C8000-memory.dmp	upx
behavioral1/memory/2996-57-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-52-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-59-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-60-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-63-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-62-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-61-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-64-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/524-65-0x0000000003510000-0x00000000038D8000-memory.dmp	upx
behavioral1/memory/2996-66-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-67-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-68-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-69-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-70-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-71-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-72-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-73-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-74-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-75-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-76-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-77-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral1/memory/2996-78-0x0000000000400000-0x00000000004B5000-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	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.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

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	2996	mcsft.exe
Token: SeSecurityPrivilege	2996	mcsft.exe
Token: SeTakeOwnershipPrivilege	2996	mcsft.exe
Token: SeLoadDriverPrivilege	2996	mcsft.exe
Token: SeSystemProfilePrivilege	2996	mcsft.exe
Token: SeSystemtimePrivilege	2996	mcsft.exe
Token: SeProfSingleProcessPrivilege	2996	mcsft.exe
Token: SeIncBasePriorityPrivilege	2996	mcsft.exe
Token: SeCreatePagefilePrivilege	2996	mcsft.exe
Token: SeBackupPrivilege	2996	mcsft.exe
Token: SeRestorePrivilege	2996	mcsft.exe
Token: SeShutdownPrivilege	2996	mcsft.exe
Token: SeDebugPrivilege	2996	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2996	mcsft.exe
Token: SeChangeNotifyPrivilege	2996	mcsft.exe
Token: SeRemoteShutdownPrivilege	2996	mcsft.exe
Token: SeUndockPrivilege	2996	mcsft.exe
Token: SeManageVolumePrivilege	2996	mcsft.exe
Token: SeImpersonatePrivilege	2996	mcsft.exe
Token: SeCreateGlobalPrivilege	2996	mcsft.exe
Token: 33	2996	mcsft.exe
Token: 34	2996	mcsft.exe
Token: 35	2996	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

pid	Process
524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
2940	mcsft.exe
2996	mcsft.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 524 wrote to memory of 2388	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	31
PID 524 wrote to memory of 2388	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	31
PID 524 wrote to memory of 2388	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	31
PID 524 wrote to memory of 2388	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	31
PID 2388 wrote to memory of 2768	2388	cmd.exe	33
PID 2388 wrote to memory of 2768	2388	cmd.exe	33
PID 2388 wrote to memory of 2768	2388	cmd.exe	33
PID 2388 wrote to memory of 2768	2388	cmd.exe	33
PID 524 wrote to memory of 2940	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	34
PID 524 wrote to memory of 2940	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	34
PID 524 wrote to memory of 2940	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	34
PID 524 wrote to memory of 2940	524	b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe	34
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35
PID 2940 wrote to memory of 2996	2940	mcsft.exe	35

C:\Users\Admin\AppData\Local\Temp\b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe
"C:\Users\Admin\AppData\Local\Temp\b6a28bc8e0b60a4c9fcc7978755bf9a2085bdcca025e13d04b21beea4f7096ceN.exe"
1⤵
- Loads dropped DLL
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:524
- C:\Windows\SysWOW64\cmd.exe
  cmd /c ""C:\Users\Admin\AppData\Local\Temp\YHdRA.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2388
- - 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:2768
- 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:2940
- - 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:2996

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