Detectionhightest

Suspicious Child Process Of BgInfo.EXE

Detects suspicious child processes of "BgInfo.exe" which could be a sign of potential abuse of the binary to proxy execution via external VBScript

Convert In Phoenix Studio

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

Launch

Nasreddine Bencherchali (Nextron Systems)Created Wed Aug 16811f459f-9231-45d4-959a-0266c6311987windows

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:
        ParentImage|endswith:
            - '\bginfo.exe'
            - '\bginfo64.exe'
    selection_child:
        - Image|endswith:
              - '\calc.exe'
              - '\cmd.exe'
              - '\cscript.exe'
              - '\mshta.exe'
              - '\notepad.exe'
              - '\powershell.exe'
              - '\pwsh.exe'
              - '\wscript.exe'
        - Image|contains:
              - '\AppData\Local\'
              - '\AppData\Roaming\'
              - ':\Users\Public\'
              - ':\Temp\'
              - ':\Windows\Temp\'
              - ':\PerfLogs\'
    condition: all of selection_*