tofsee | feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37

Disable or Modify System Firewall

T1562.004

pid	Process
564	netsh.exe

Sets service image path in registry 3 TTPs 1 IoCs

This determines the executable launched when a service starts. It can be used to establish persistence.

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Windows Service

persistence privilege_escalation

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\yduqqlcv\ImagePath = "C:\\Windows\\SysWOW64\\yduqqlcv\\tfesdnvp.exe"	svchost.exe

Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Deletes itself 1 TTPs 1 IoCs

defense_evasion

File Deletion

T1070.004

pid	Process
4532	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3492	tfesdnvp.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3492 set thread context of 4532	3492	tfesdnvp.exe	103

Launches sc.exe 3 IoCs

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

pid	Process
1728	sc.exe
2888	sc.exe
4372	sc.exe

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

Executes a command shell one-liner 1 TTPs 2 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
2432	cmd.exe
2680	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 9 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	tfesdnvp.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.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

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 5100 wrote to memory of 2432	5100	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe	89
PID 5100 wrote to memory of 2680	5100	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe	91
PID 5100 wrote to memory of 1728	5100	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe	93
PID 5100 wrote to memory of 2888	5100	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe	96
PID 5100 wrote to memory of 4372	5100	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe	98
PID 5100 wrote to memory of 564	5100	feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe	100
PID 3492 wrote to memory of 4532	3492	tfesdnvp.exe	103
PID 3492 wrote to memory of 4532	3492	tfesdnvp.exe	103

C:\Users\Admin\AppData\Local\Temp\feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe
"C:\Users\Admin\AppData\Local\Temp\feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5100
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yduqqlcv\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:2432
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tfesdnvp.exe" C:\Windows\SysWOW64\yduqqlcv\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:2680
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yduqqlcv binPath= "C:\Windows\SysWOW64\yduqqlcv\tfesdnvp.exe /d\"C:\Users\Admin\AppData\Local\Temp\feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1728
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yduqqlcv "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2888
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yduqqlcv
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4372
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  - Event Triggered Execution: Netsh Helper DLL
  - System Location Discovery: System Language Discovery
  PID:564

C:\Windows\SysWOW64\yduqqlcv\tfesdnvp.exe
C:\Windows\SysWOW64\yduqqlcv\tfesdnvp.exe /d"C:\Users\Admin\AppData\Local\Temp\feb35486eb8bbc12d97577759c289487eca9301e476eaa03499029c4101a2d37.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3492
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  - System Location Discovery: System Language Discovery
  PID:4532

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Windows Command Shell

T1059.003

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

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

2

T1562

Disable or Modify System Firewall

T1562.004

Disable or Modify Tools

T1562.001

Indicator Removal

T1070

File Deletion

Modify Registry

Credential Access

Discovery

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery