Detectionmediumtest

Program Executed Using Proxy/Local Command Via SSH.EXE

Detect usage of the "ssh.exe" binary as a proxy to launch other programs.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

François Hubaut, Nasreddine Bencherchali (Nextron Systems)Created Thu Dec 29Updated Thu Oct 167d6d30b8-5b91-4b90-a891-46cccaf29598windows

Log Source

WindowsProcess Creation

ProductWindows← raw: windows

CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic

detection:
    selection_parent:
        # ParentCommandLine: '"C:\Windows\System32\OpenSSH\sshd.exe" -R'
        ParentImage: 'C:\Windows\System32\OpenSSH\sshd.exe'
    selection_cli_img:
        - Image|endswith: '\ssh.exe'
        - Product: 'OpenSSH for Windows'
        - Hashes|contains:
              - 'IMPHASH=55b4964d29aad5438b9e950052dbbbc0'
              - 'IMPHASH=334d66c33503ccbf647c15b47c27eef4'
              - 'IMPHASH=27b0da080ef92afb37983d30d839141e'
              - 'IMPHASH=977eb4c263d384e47daa0712d34713ab'
              - 'IMPHASH=3eaadce9ae43d5a918bb082065815c3b'
              - 'IMPHASH=980fe6cf0d996ab1eedf877222e722aa'
              - 'IMPHASH=5f959422308ac3d721010d66647e100e'
              - 'IMPHASH=a49aaa3d03d1cd9c8dc7fca60f7f480b'
              - 'IMPHASH=dd335f759b6d5d6a8382b71dd9d65791'
    selection_cli_flags:
        - CommandLine|contains: 'ProxyCommand='
        - CommandLine|contains|all:
              - 'PermitLocalCommand=yes'
              - ' LocalCommand'
    condition: selection_parent or all of selection_cli_*