tofsee | 3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae

Disable or Modify System Firewall

T1562.004

pid	Process
2108	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\yfntpetw\ImagePath = "C:\\Windows\\SysWOW64\\yfntpetw\\oonteszc.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
5660	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4224	oonteszc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4224 set thread context of 5660	4224	oonteszc.exe	104

Launches sc.exe 3 IoCs

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

pid	Process
1048	sc.exe
2624	sc.exe
1536	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
1108	cmd.exe
5872	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	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.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	oonteszc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4116 wrote to memory of 1108	4116	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe	90
PID 4116 wrote to memory of 5872	4116	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe	92
PID 4116 wrote to memory of 1048	4116	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe	94
PID 4116 wrote to memory of 2624	4116	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe	96
PID 4116 wrote to memory of 1536	4116	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe	99
PID 4116 wrote to memory of 2108	4116	3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe	102
PID 4224 wrote to memory of 5660	4224	oonteszc.exe	104
PID 4224 wrote to memory of 5660	4224	oonteszc.exe	104

C:\Users\Admin\AppData\Local\Temp\3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe
"C:\Users\Admin\AppData\Local\Temp\3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4116
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\yfntpetw\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:1108
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oonteszc.exe" C:\Windows\SysWOW64\yfntpetw\
  2⤵
  - Executes a command shell one-liner
  - System Location Discovery: System Language Discovery
  PID:5872
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create yfntpetw binPath= "C:\Windows\SysWOW64\yfntpetw\oonteszc.exe /d\"C:\Users\Admin\AppData\Local\Temp\3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1048
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description yfntpetw "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2624
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start yfntpetw
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1536
- 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:2108

C:\Windows\SysWOW64\yfntpetw\oonteszc.exe
C:\Windows\SysWOW64\yfntpetw\oonteszc.exe /d"C:\Users\Admin\AppData\Local\Temp\3b40237ab21ab21b7e78bd7fbe873a3fa84b71bf409181e710051e88e03e96ae.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4224
- 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:5660

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