phorphiex | d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3

Windows Service

T1543.003

Processes:

sysarddrvs.exewinblrsnrcs.exe

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

Phorphiex payload 1 IoCs

Processes:

resource	yara_rule
C:\Windows\sysarddrvs.exe	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 12 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

winblrsnrcs.exesysarddrvs.exe

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

Processes:

powershell.exe

pid process

2240 powershell.exe
Stops running service(s) 4 TTPs
evasion execution

Windows Service
T1543.003

Impair Defenses
T1562

Service Stop
T1489

Service Execution
T1569.002

pid	process
2240	powershell.exe

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

Processes:

sysarddrvs.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2636447293-1148739154-93880854-1000\Control Panel\International\Geo\Nation	sysarddrvs.exe

Executes dropped EXE 4 IoCs

Processes:

sysarddrvs.exe1868615765.exewinblrsnrcs.exe250687440.exe

pid process

2884 sysarddrvs.exe
844 1868615765.exe
2960 winblrsnrcs.exe
116 250687440.exe

pid	process
2884	sysarddrvs.exe
844	1868615765.exe
2960	winblrsnrcs.exe
116	250687440.exe

Windows security modification 2 TTPs 14 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

Processes:

sysarddrvs.exewinblrsnrcs.exe

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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe1868615765.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Windows Settings = "C:\\Windows\\sysarddrvs.exe"	d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Windows Service = "C:\\Windows\\winblrsnrcs.exe"	1868615765.exe

Drops file in Windows directory 4 IoCs

Processes:

1868615765.exed8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe

description	ioc	process
File opened for modification	C:\Windows\winblrsnrcs.exe	1868615765.exe
File created	C:\Windows\sysarddrvs.exe	d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe
File opened for modification	C:\Windows\sysarddrvs.exe	d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe
File created	C:\Windows\winblrsnrcs.exe	1868615765.exe

Launches sc.exe 6 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exesc.exesc.exesc.exe

pid process

2532 sc.exe
3144 sc.exe
3760 sc.exe
4508 sc.exe
3912 sc.exe
2084 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

powershell.exe

pid process

2240 powershell.exe
2240 powershell.exe
Suspicious use of AdjustPrivilegeToken 1 IoCs

Processes:

powershell.exe

description pid process

Token: SeDebugPrivilege 2240 powershell.exe

pid	process
2532	sc.exe
3144	sc.exe
3760	sc.exe
4508	sc.exe
3912	sc.exe
2084	sc.exe

pid	process
2240	powershell.exe
2240	powershell.exe

description	pid	process
Token: SeDebugPrivilege	2240	powershell.exe

Suspicious use of WriteProcessMemory 36 IoCs

Processes:

d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exesysarddrvs.execmd.execmd.exe1868615765.exe

description	pid	process	target process
PID 4552 wrote to memory of 2884	4552	d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe	sysarddrvs.exe
PID 4552 wrote to memory of 2884	4552	d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe	sysarddrvs.exe
PID 4552 wrote to memory of 2884	4552	d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe	sysarddrvs.exe
PID 2884 wrote to memory of 5032	2884	sysarddrvs.exe	cmd.exe
PID 2884 wrote to memory of 5032	2884	sysarddrvs.exe	cmd.exe
PID 2884 wrote to memory of 5032	2884	sysarddrvs.exe	cmd.exe
PID 2884 wrote to memory of 4984	2884	sysarddrvs.exe	cmd.exe
PID 2884 wrote to memory of 4984	2884	sysarddrvs.exe	cmd.exe
PID 2884 wrote to memory of 4984	2884	sysarddrvs.exe	cmd.exe
PID 5032 wrote to memory of 2240	5032	cmd.exe	powershell.exe
PID 5032 wrote to memory of 2240	5032	cmd.exe	powershell.exe
PID 5032 wrote to memory of 2240	5032	cmd.exe	powershell.exe
PID 4984 wrote to memory of 4508	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 4508	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 4508	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 3912	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 3912	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 3912	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 2084	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 2084	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 2084	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 2532	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 2532	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 2532	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 3144	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 3144	4984	cmd.exe	sc.exe
PID 4984 wrote to memory of 3144	4984	cmd.exe	sc.exe
PID 2884 wrote to memory of 844	2884	sysarddrvs.exe	1868615765.exe
PID 2884 wrote to memory of 844	2884	sysarddrvs.exe	1868615765.exe
PID 2884 wrote to memory of 844	2884	sysarddrvs.exe	1868615765.exe
PID 844 wrote to memory of 2960	844	1868615765.exe	winblrsnrcs.exe
PID 844 wrote to memory of 2960	844	1868615765.exe	winblrsnrcs.exe
PID 844 wrote to memory of 2960	844	1868615765.exe	winblrsnrcs.exe
PID 2884 wrote to memory of 116	2884	sysarddrvs.exe	250687440.exe
PID 2884 wrote to memory of 116	2884	sysarddrvs.exe	250687440.exe
PID 2884 wrote to memory of 116	2884	sysarddrvs.exe	250687440.exe

C:\Users\Admin\AppData\Local\Temp\d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe
"C:\Users\Admin\AppData\Local\Temp\d8b83f78ed905a7948e2e1e371f0f905bcaaabbb314c692fee408a454f8338a3.exe"
1⤵
- Adds Run key to start application
- Drops file in Windows directory
- Suspicious use of WriteProcessMemory
PID:4552
- C:\Windows\sysarddrvs.exe
  C:\Windows\sysarddrvs.exe
  2⤵
  - Modifies security service
  - Windows security bypass
  - Checks computer location settings
  - Executes dropped EXE
  - Windows security modification
  - Suspicious use of WriteProcessMemory
  PID:2884
- - 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⤵
    - Suspicious use of WriteProcessMemory
    PID:5032
  - - 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
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:2240
- - 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
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4984
  - - C:\Windows\SysWOW64\sc.exe
      sc stop UsoSvc
      4⤵
      Launches sc.exe
      PID:4508
  - - C:\Windows\SysWOW64\sc.exe
      sc stop WaaSMedicSvc
      4⤵
      Launches sc.exe
      PID:3912
  - - C:\Windows\SysWOW64\sc.exe
      sc stop wuauserv
      4⤵
      Launches sc.exe
      PID:2084
  - - C:\Windows\SysWOW64\sc.exe
      sc stop DoSvc
      4⤵
      Launches sc.exe
      PID:2532
  - - C:\Windows\SysWOW64\sc.exe
      sc stop BITS
      4⤵
      Launches sc.exe
      PID:3144
- - C:\Users\Admin\AppData\Local\Temp\1868615765.exe
    C:\Users\Admin\AppData\Local\Temp\1868615765.exe
    3⤵
    - Executes dropped EXE
    - Adds Run key to start application
    - Drops file in Windows directory
    - Suspicious use of WriteProcessMemory
    PID:844
  - - C:\Windows\winblrsnrcs.exe
      C:\Windows\winblrsnrcs.exe
      4⤵
      Modifies security service
      Windows security bypass
      Executes dropped EXE
      Windows security modification
      PID:2960
- - C:\Users\Admin\AppData\Local\Temp\250687440.exe
    C:\Users\Admin\AppData\Local\Temp\250687440.exe
    3⤵
    - Executes dropped EXE
    PID:116

C:\Windows\system32\sc.exe
C:\Windows\system32\sc.exe start wuauserv
1⤵
- Launches sc.exe
PID:3760

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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Service Stop