dcrat | 295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\SettingsHandlers_UserAccount\\RuntimeBroker.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\SettingsHandlers_UserAccount\\RuntimeBroker.exe\", \"C:\\Windows\\System32\\Nlsdl\\RuntimeBroker.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\SettingsHandlers_UserAccount\\RuntimeBroker.exe\", \"C:\\Windows\\System32\\Nlsdl\\RuntimeBroker.exe\", \"C:\\Windows\\System32\\VoiceActivationManager\\conhost.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Shell = "explorer.exe, \"C:\\Windows\\System32\\SettingsHandlers_UserAccount\\RuntimeBroker.exe\", \"C:\\Windows\\System32\\Nlsdl\\RuntimeBroker.exe\", \"C:\\Windows\\System32\\VoiceActivationManager\\conhost.exe\", \"C:\\Documents and Settings\\Perfmonitorfontinto.exe\""	Perfmonitorfontinto.exe

Process spawned unexpected child process 4 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2120	768	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2856	768	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3968	768	schtasks.exe	86
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4568	768	schtasks.exe	86

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023b98-10.dat	dcrat
behavioral2/memory/3332-13-0x00000000002B0000-0x00000000004BE000-memory.dmp	dcrat

Disables Task Manager via registry modification
evasion

Checks computer location settings 2 TTPs 3 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\Control Panel\International\Geo\Nation	Perfmonitorfontinto.exe

Executes dropped EXE 2 IoCs

pid	Process
3332	Perfmonitorfontinto.exe
4904	RuntimeBroker.exe

Adds Run key to start application 2 TTPs 8 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Windows\\System32\\VoiceActivationManager\\conhost.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Perfmonitorfontinto = "\"C:\\Documents and Settings\\Perfmonitorfontinto.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Perfmonitorfontinto = "\"C:\\Documents and Settings\\Perfmonitorfontinto.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\SettingsHandlers_UserAccount\\RuntimeBroker.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\SettingsHandlers_UserAccount\\RuntimeBroker.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\Nlsdl\\RuntimeBroker.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\RuntimeBroker = "\"C:\\Windows\\System32\\Nlsdl\\RuntimeBroker.exe\""	Perfmonitorfontinto.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\conhost = "\"C:\\Windows\\System32\\VoiceActivationManager\\conhost.exe\""	Perfmonitorfontinto.exe

Drops file in System32 directory 7 IoCs

description	ioc	Process
File created	C:\Windows\System32\SettingsHandlers_UserAccount\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	Perfmonitorfontinto.exe
File created	C:\Windows\System32\Nlsdl\RuntimeBroker.exe	Perfmonitorfontinto.exe
File created	C:\Windows\System32\Nlsdl\9e8d7a4ca61bd92aff00cc37a7a4d62a2cac998d	Perfmonitorfontinto.exe
File created	C:\Windows\System32\VoiceActivationManager\conhost.exe	Perfmonitorfontinto.exe
File created	C:\Windows\System32\VoiceActivationManager\088424020bedd6b28ac7fd22ee35dcd7322895ce	Perfmonitorfontinto.exe
File created	C:\Windows\System32\SettingsHandlers_UserAccount\RuntimeBroker.exe	Perfmonitorfontinto.exe
File opened for modification	C:\Windows\System32\SettingsHandlers_UserAccount\RuntimeBroker.exe	Perfmonitorfontinto.exe

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 4 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	295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000_Classes\Local Settings	295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe
Key created	\REGISTRY\USER\S-1-5-21-3442511616-637977696-3186306149-1000_Classes\Local Settings	Perfmonitorfontinto.exe

Modifies registry key 1 TTPs 1 IoCs

Modify Registry

pid	Process
3256	reg.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 4 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence execution

Scheduled Task

pid	Process
4568	schtasks.exe
2120	schtasks.exe
2856	schtasks.exe
3968	schtasks.exe

Suspicious behavior: EnumeratesProcesses 5 IoCs

pid	Process
3332	Perfmonitorfontinto.exe
3332	Perfmonitorfontinto.exe
3332	Perfmonitorfontinto.exe
4904	RuntimeBroker.exe
4904	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3332	Perfmonitorfontinto.exe
Token: SeDebugPrivilege	4904	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 17 IoCs

description	pid	Process	procid_target
PID 1396 wrote to memory of 3580	1396	295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe	82
PID 1396 wrote to memory of 3580	1396	295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe	82
PID 1396 wrote to memory of 3580	1396	295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe	82
PID 3580 wrote to memory of 2956	3580	WScript.exe	88
PID 3580 wrote to memory of 2956	3580	WScript.exe	88
PID 3580 wrote to memory of 2956	3580	WScript.exe	88
PID 2956 wrote to memory of 3332	2956	cmd.exe	90
PID 2956 wrote to memory of 3332	2956	cmd.exe	90
PID 3332 wrote to memory of 4432	3332	Perfmonitorfontinto.exe	95
PID 3332 wrote to memory of 4432	3332	Perfmonitorfontinto.exe	95
PID 2956 wrote to memory of 3256	2956	cmd.exe	97
PID 2956 wrote to memory of 3256	2956	cmd.exe	97
PID 2956 wrote to memory of 3256	2956	cmd.exe	97
PID 4432 wrote to memory of 4360	4432	cmd.exe	98
PID 4432 wrote to memory of 4360	4432	cmd.exe	98
PID 4432 wrote to memory of 4904	4432	cmd.exe	101
PID 4432 wrote to memory of 4904	4432	cmd.exe	101

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe
"C:\Users\Admin\AppData\Local\Temp\295688858c999f14377a10366d1b74037d6c7e92aa36554bf5b7ce478a6e6205.exe"
1⤵
- DcRat
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1396
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Perfmonitor\lNQQOstPqxiFMmsYvmB.vbe"
  2⤵
  - Checks computer location settings
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:3580
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Perfmonitor\O0mpFdbBjdm7srZfGtzhIPYG.bat" "
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2956
  - - C:\Perfmonitor\Perfmonitorfontinto.exe
      "C:\Perfmonitor\Perfmonitorfontinto.exe"
      4⤵
      Modifies WinLogon for persistence
      Checks computer location settings
      Executes dropped EXE
      Adds Run key to start application
      Drops file in System32 directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:3332
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\CKITq2l3U5.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4432
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4360
      - C:\Windows\System32\Nlsdl\RuntimeBroker.exe
        
        "C:\Windows\System32\Nlsdl\RuntimeBroker.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4904
  - - C:\Windows\SysWOW64\reg.exe
      reg add HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System /v DisableTaskMgr /t REG_DWORD /d 1 /f
      4⤵
      System Location Discovery: System Language Discovery
      Modifies registry key
      PID:3256

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\SettingsHandlers_UserAccount\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2120

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Windows\System32\Nlsdl\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2856

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Windows\System32\VoiceActivationManager\conhost.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3968

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Perfmonitorfontinto" /sc ONLOGON /tr "'C:\Documents and Settings\Perfmonitorfontinto.exe'" /rl HIGHEST /f
1⤵
- DcRat
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4568

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Scheduled Task

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Winlogon Helper DLL

T1547.004

Scheduled Task/Job

T1053

Scheduled Task

Defense Evasion

Modify Registry

3

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery