Emerging Threathightest

Potential CVE-2022-26809 Exploitation Attempt

Detects suspicious remote procedure call (RPC) service anomalies based on the spawned sub processes (long shot to detect the exploitation of vulnerabilities like CVE-2022-26809)

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Launch

Florian Roth (Nextron Systems)Created Wed Apr 13Updated Fri Feb 03a7cd7306-df8b-4398-b711-6f3e4935cf162022

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:
        ParentImage: 'C:\Windows\System32\svchost.exe'
        ParentCommandLine|contains: '-k RPCSS'
    condition: selection

False Positives

Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

Some cases in which the service spawned a werfault.exe process

References