Emerging Threathighstable

Potential Emotet Activity

Detects all Emotet like process executions that are not covered by the more generic rules

Convert In Phoenix Studio

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

Florian Roth (Nextron Systems)Created Mon Sep 30Updated Sat Feb 04d02e8cf5-6099-48cf-9bfc-1eec2d0c7b182019

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:
        CommandLine|contains:
            - ' -e* PAA'
            - 'JABlAG4AdgA6AHUAcwBlAHIAcAByAG8AZgBpAGwAZQ' # $env:userprofile
            - 'QAZQBuAHYAOgB1AHMAZQByAHAAcgBvAGYAaQBsAGUA' # $env:userprofile
            - 'kAGUAbgB2ADoAdQBzAGUAcgBwAHIAbwBmAGkAbABlA' # $env:userprofile
            - 'IgAoACcAKgAnACkAOwAkA' # "('*');$
            - 'IAKAAnACoAJwApADsAJA' # "('*');$
            - 'iACgAJwAqACcAKQA7ACQA' # "('*');$
            - 'JABGAGwAeAByAGgAYwBmAGQ'
            - 'PQAkAGUAbgB2ADoAdABlAG0AcAArACgA' # =$env:temp+(
            - '0AJABlAG4AdgA6AHQAZQBtAHAAKwAoA' # =$env:temp+(
            - '9ACQAZQBuAHYAOgB0AGUAbQBwACsAKA' # =$env:temp+(
    filter:
        CommandLine|contains:
            - 'fAAgAEMAbwBuAHYAZQByAHQAVABvAC0ASgBzAG8AbgAgAC0ARQByAHIAbwByAEEAYwB0AGkAbwBuACAAUwBpAGwAZQBuAHQAbAB5AEMAbwBuAHQAaQBuAHUAZQ'
            - 'wAIABDAG8AbgB2AGUAcgB0AFQAbwAtAEoAcwBvAG4AIAAtAEUAcgByAG8AcgBBAGMAdABpAG8AbgAgAFMAaQBsAGUAbgB0AGwAeQBDAG8AbgB0AGkAbgB1AGUA'
            - '8ACAAQwBvAG4AdgBlAHIAdABUAG8ALQBKAHMAbwBuACAALQBFAHIAcgBvAHIAQQBjAHQAaQBvAG4AIABTAGkAbABlAG4AdABsAHkAQwBvAG4AdABpAG4AdQBlA'
    condition: selection and not filter