phorphiex | 31fee21f74a3be7ddc0947ff40c941a68545a7f183e56c52b4830c0dbb815a89

Windows Service

T1543.003

Disable or Modify Tools

Processes:

taskhostw.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableScanOnRealtimeEnable = "1"	taskhostw.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableOnAccessProtection = "1"	taskhostw.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection\DisableBehaviorMonitoring = "1"	taskhostw.exe
Key created	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Policies\Microsoft\Windows Defender\Real-Time Protection	taskhostw.exe

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

Phorphiex payload 1 IoCs

Processes:

resource	yara_rule
C:\287072213927849\taskhostw.exe	family_phorphiex

Windows security bypass 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

Modify Registry

Processes:

taskhostw.exe

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

Executes dropped EXE 1 IoCs

Processes:

taskhostw.exe

pid process

3464 taskhostw.exe

pid	process
3464	taskhostw.exe

Windows security modification 2 TTPs 4 IoCs

evasion trojan

Disable or Modify Tools

Modify Registry

Processes:

taskhostw.exe

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

Adds Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

Processes:

22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\Windows\CurrentVersion\Run\Host Process for Windows Tasks = "C:\\287072213927849\\taskhostw.exe"	22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-17203666-93769886-2545153620-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Host Process for Windows Tasks = "C:\\287072213927849\\taskhostw.exe"	22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe

Drops file in Program Files directory 1 IoCs

Processes:

taskhostw.exe

description ioc process

File opened for modification C:\Program Files\7-Zip\7z.exe taskhostw.exe
Program crash 1 IoCs

Processes:

WerFault.exe

pid pid_target process target process

3876 3464 WerFault.exe taskhostw.exe

description	ioc	process
File opened for modification	C:\Program Files\7-Zip\7z.exe	taskhostw.exe

pid	pid_target	process	target process
3876	3464	WerFault.exe	taskhostw.exe

Suspicious use of WriteProcessMemory 3 IoCs

Processes:

22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe

description	pid	process	target process
PID 944 wrote to memory of 3464	944	22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe	taskhostw.exe
PID 944 wrote to memory of 3464	944	22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe	taskhostw.exe
PID 944 wrote to memory of 3464	944	22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe	taskhostw.exe

C:\Users\Admin\AppData\Local\Temp\22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\22e422508a4d16745e129af689b8b6b6_JaffaCakes118.exe"
1⤵
- Adds Run key to start application
- Suspicious use of WriteProcessMemory
PID:944

C:\287072213927849\taskhostw.exe
C:\287072213927849\taskhostw.exe
2⤵
- Modifies Windows Defender Real-time Protection settings
- Windows security bypass
- Executes dropped EXE
- Windows security modification
- Drops file in Program Files directory
PID:3464

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -u -p 3464 -s 1304
3⤵
- Program crash
PID:3876

C:\Windows\SysWOW64\WerFault.exe
C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 3464 -ip 3464
1⤵
PID:540

Network

MITRE ATT&CK Matrix ATT&CK v13

Initial Access

Execution

Persistence

Create or Modify System Process

T1543

Windows Service

T1543.003

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Privilege Escalation

Create or Modify System Process

T1543

Windows Service

T1543.003

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Defense Evasion

Modify Registry

4

Impair Defenses

3

T1562

Disable or Modify Tools

3