Emerging Threathighexperimental

Suspicious Child Process of SolarWinds WebHelpDesk

Detects suspicious child processes spawned by SolarWinds WebHelpDesk (WHD) application, which may indicate exploitation activity leveraging RCE vulnerabilities such as CVE-2025-40551, CVE-2025-40536, or CVE-2025-26399

Convert In Phoenix Studio

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

Launch

Huntress Team, Swachchhanda Shrawan Poudel (Nextron Systems)Created Wed Feb 118c7f4a2d-3b9e-4f1c-9a6d-2e8f5c3d9a1b2025

Emerging Threat

Active Threat

Developed to detect an active or emerging threat. Prioritize investigation of any alerts and correlate with threat intelligence.

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|contains: '\WebHelpDesk\bin\'
        ParentImage|endswith:
            - '\java.exe'
            - '\javaw.exe'
        ParentCommandLine|contains: 'tomcat'
    selection_suspicious_child:
        CommandLine|contains:
            - '-enc'
            - 'base64'
            - 'bitsadmin'
            - 'certutil'
            - 'curl'
            - 'Invoke-RestMethod'
            - 'Invoke-WebRequest'
            - 'irm '
            - 'iwr '
            - 'mshta'
            - 'msiexec'
            - 'Net.WebClient'
            - 'Start-BitsTransfer'
            - 'wget'
            - 'wmic'
    condition: all of selection_*