windows verified critical v1.0.0

f.sys

Sophos, from time to time, has observed a threat actor deploy variants of Poortry on different machines within a single estate during an attack. These variants contain the same payload, but signed with a different certificate than the driver first seen used during the attack.

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sc.exe create f.sys binPath=C:\windows\temp\f.sys type=kernel && sc.exe start f.sys
sc.exe create f.sys binPath=C:\windows\temp\f.sys type=kernel && sc.exe start f.sys

Sandbox: execFile · Timeout: 30s

Capabilities

security.privilegeescalation.kernel-exploit

Documentation

examples:

  • description: "Load the kernel driver" command: "sc.exe create f.sys binPath=C:\\windows\\temp\\f.sys type=kernel && sc.exe start f.sys"
  • description: "Exploit the driver for privilege escalation" command: "Exploit.exe --driver f.sys"

f.sys

Sophos, from time to time, has observed a threat actor deploy variants of Poortry on different machines within a single estate during an attack. These variants contain the same payload, but signed with a different certificate than the driver first seen used during the attack.

Use Case: Elevate privileges

Required Privileges: kernel

MITRE ATT&CK: T1068

References