61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276

Processes:

csrss.exe61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

Adds policy Run key to start application 2 TTPs 2 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\Audio Driver = "C:\\Program Files\\Common Files\\lsass.exe"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

Executes dropped EXE 2 IoCs

Processes:

csrss.exelsass.exe

pid process

4644 csrss.exe
4976 lsass.exe

pid	process
4644	csrss.exe
4976	lsass.exe

Modifies Installed Components in the registry 2 TTPs 3 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

description	ioc	process
Key created	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{d2616110-0000-0000-0000-d01200000000}	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{d2616110-0000-0000-0000-d01200000000}\StubPath = "C:\\ProgramData\\csrss.exe -r"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Active Setup\Installed Components\{d2616110-0000-0000-0000-d01200000000}\IsInstalled = "1"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

2944 netsh.exe

pid	process
2944	netsh.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:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2971393436-602173351-1645505021-1000\Control Panel\International\Geo\Nation	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

Modify Registry

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Audio Driver = "C:\\ProgramData\\csrss.exe"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

Checks whether UAC is enabled 1 TTPs 4 IoCs

evasion trojan

System Information Discovery

T1082

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.execsrss.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Key value queried	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA	csrss.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe

Drops file in Program Files directory 2 IoCs

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

description	ioc	process
File created	C:\Program Files\Common Files\lsass.exe	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
File opened for modification	C:\Program Files\Common Files\lsass.exe	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.execsrss.exelsass.exe

description	pid	process
Token: SeDebugPrivilege	3728	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Token: SeDebugPrivilege	4644	csrss.exe
Token: SeDebugPrivilege	4976	lsass.exe

Suspicious use of WriteProcessMemory 6 IoCs

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.execsrss.exe

description	pid	process	target process
PID 3728 wrote to memory of 4644	3728	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe	csrss.exe
PID 3728 wrote to memory of 4644	3728	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe	csrss.exe
PID 3728 wrote to memory of 4976	3728	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe	lsass.exe
PID 3728 wrote to memory of 4976	3728	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe	lsass.exe
PID 4644 wrote to memory of 2944	4644	csrss.exe	netsh.exe
PID 4644 wrote to memory of 2944	4644	csrss.exe	netsh.exe

System policy modification 1 TTPs 2 IoCs

evasion

Modify Registry

Processes:

61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.execsrss.exe

description	ioc	process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System\EnableLUA = "0"	csrss.exe

C:\Users\Admin\AppData\Local\Temp\61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe
"C:\Users\Admin\AppData\Local\Temp\61e6b39454f3b5fef2fde0bd3ccc3acf37830e68d6ba1e3d5402d2d7cd38d276.exe"
1⤵
- UAC bypass
- Adds policy Run key to start application
- Modifies Installed Components in the registry
- Checks computer location settings
- Adds Run key to start application
- Checks whether UAC is enabled
- Drops file in Program Files directory
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:3728

C:\ProgramData\csrss.exe
"C:\ProgramData\csrss.exe"
2⤵
- UAC bypass
- Executes dropped EXE
- Checks whether UAC is enabled
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
- System policy modification
PID:4644

C:\Windows\SYSTEM32\netsh.exe
"netsh.exe" firewall add allowedprogram program="C:\ProgramData\csrss.exe" name="Audio Driver" mode=ENABLE scope=ALL profile=ALL
3⤵
- Modifies Windows Firewall
PID:2944

C:\Program Files\Common Files\lsass.exe
"C:\Program Files\Common Files\lsass.exe"
2⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:4976

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Registry Run Keys / Startup Folder

3

Modify Existing Service

T1031

Privilege Escalation

Bypass User Account Control

T1088

Defense Evasion

Bypass User Account Control

T1088

Disabling Security Tools

T1089

Modify Registry

5

Credential Access

Discovery

Query Registry