phorphiex | 1f2e9724dfb091059ae16c305601e21d64b5308df76ddef6b394573e576ef1ff

Windows Service

T1543.003

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\wuauserv\Start = "4"	sysvplervcs.exe

Phorphiex payload 1 IoCs

resource	yara_rule
behavioral1/files/0x000a000000023c91-3.dat	family_phorphiex

Phorphiex, Phorpiex
Phorphiex or Phorpiex Malware family which infects systems to distribute other malicious payloads such as ransomware, stealers and cryptominers.
worm trojan loader phorphiex

Windows security bypass 2 TTPs 6 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	sysvplervcs.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
848	powershell.exe

Stops running service(s) 4 TTPs
evasion execution

Windows Service
T1543.003

Impair Defenses
T1562

Service Stop
T1489

Service Execution
T1569.002

Checks computer location settings 2 TTPs 1 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	sysvplervcs.exe

Executes dropped EXE 1 IoCs

pid	Process
4772	sysvplervcs.exe

Windows security modification 2 TTPs 7 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\FirewallDisableNotify = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiSpywareOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\AntiVirusDisableNotify = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesOverride = "1"	sysvplervcs.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Security Center\UpdatesDisableNotify = "1"	sysvplervcs.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Windows Settings = "C:\\Windows\\sysvplervcs.exe"	21900.scr

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\sysvplervcs.exe	21900.scr
File opened for modification	C:\Windows\sysvplervcs.exe	21900.scr

Launches sc.exe 5 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
4908	sc.exe
2904	sc.exe
744	sc.exe
4260	sc.exe
4144	sc.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 10 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	sysvplervcs.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	21900.scr
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	powershell.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
848	powershell.exe
848	powershell.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	848	powershell.exe

Suspicious use of WriteProcessMemory 27 IoCs

description	pid	Process	procid_target
PID 4484 wrote to memory of 4772	4484	21900.scr	87
PID 4484 wrote to memory of 4772	4484	21900.scr	87
PID 4484 wrote to memory of 4772	4484	21900.scr	87
PID 4772 wrote to memory of 2840	4772	sysvplervcs.exe	92
PID 4772 wrote to memory of 2840	4772	sysvplervcs.exe	92
PID 4772 wrote to memory of 2840	4772	sysvplervcs.exe	92
PID 4772 wrote to memory of 3240	4772	sysvplervcs.exe	94
PID 4772 wrote to memory of 3240	4772	sysvplervcs.exe	94
PID 4772 wrote to memory of 3240	4772	sysvplervcs.exe	94
PID 2840 wrote to memory of 848	2840	cmd.exe	96
PID 2840 wrote to memory of 848	2840	cmd.exe	96
PID 2840 wrote to memory of 848	2840	cmd.exe	96
PID 3240 wrote to memory of 4908	3240	cmd.exe	97
PID 3240 wrote to memory of 4908	3240	cmd.exe	97
PID 3240 wrote to memory of 4908	3240	cmd.exe	97
PID 3240 wrote to memory of 2904	3240	cmd.exe	98
PID 3240 wrote to memory of 2904	3240	cmd.exe	98
PID 3240 wrote to memory of 2904	3240	cmd.exe	98
PID 3240 wrote to memory of 744	3240	cmd.exe	99
PID 3240 wrote to memory of 744	3240	cmd.exe	99
PID 3240 wrote to memory of 744	3240	cmd.exe	99
PID 3240 wrote to memory of 4260	3240	cmd.exe	100
PID 3240 wrote to memory of 4260	3240	cmd.exe	100
PID 3240 wrote to memory of 4260	3240	cmd.exe	100
PID 3240 wrote to memory of 4144	3240	cmd.exe	101
PID 3240 wrote to memory of 4144	3240	cmd.exe	101
PID 3240 wrote to memory of 4144	3240	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\21900.scr
"C:\Users\Admin\AppData\Local\Temp\21900.scr" /S
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4484
- C:\Windows\sysvplervcs.exe
  C:\Windows\sysvplervcs.exe
  2⤵
  - Modifies security service
  - Windows security bypass
  - Checks computer location settings
  - Executes dropped EXE
  - Windows security modification
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:4772
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c powershell -Command "Add-MpPreference -ExclusionPath $env:windir; Add-MpPreference -ExclusionPath $env:TEMP; Add-MpPreference -ExclusionPath $env:USERPROFILE"
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:2840
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -Command "Add-MpPreference -ExclusionPath $env:windir; Add-MpPreference -ExclusionPath $env:TEMP; Add-MpPreference -ExclusionPath $env:USERPROFILE"
      4⤵
      Command and Scripting Interpreter: PowerShell
      System Location Discovery: System Language Discovery
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:848
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c sc stop UsoSvc & sc stop WaaSMedicSvc & sc stop wuauserv & sc stop DoSvc & sc stop BITS /wait
    3⤵
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:3240
  - - C:\Windows\SysWOW64\sc.exe
      sc stop UsoSvc
      4⤵
      Launches sc.exe
      System Location Discovery: System Language Discovery
      PID:4908
  - - C:\Windows\SysWOW64\sc.exe
      sc stop WaaSMedicSvc
      4⤵
      Launches sc.exe
      System Location Discovery: System Language Discovery
      PID:2904
  - - C:\Windows\SysWOW64\sc.exe
      sc stop wuauserv
      4⤵
      Launches sc.exe
      System Location Discovery: System Language Discovery
      PID:744
  - - C:\Windows\SysWOW64\sc.exe
      sc stop DoSvc
      4⤵
      Launches sc.exe
      System Location Discovery: System Language Discovery
      PID:4260
  - - C:\Windows\SysWOW64\sc.exe
      sc stop BITS /wait
      4⤵
      Launches sc.exe
      System Location Discovery: System Language Discovery
      PID:4144

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Defense Evasion

Impair Defenses

3

T1562

Disable or Modify Tools

Modify Registry

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Service Stop