Potential Emotet Activity

Description

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

Query · sigma

selection:
  CommandLine|contains:
  - ' -e* PAA'
  - JABlAG4AdgA6AHUAcwBlAHIAcAByAG8AZgBpAGwAZQ
  - QAZQBuAHYAOgB1AHMAZQByAHAAcgBvAGYAaQBsAGUA
  - kAGUAbgB2ADoAdQBzAGUAcgBwAHIAbwBmAGkAbABlA
  - IgAoACcAKgAnACkAOwAkA
  - IAKAAnACoAJwApADsAJA
  - iACgAJwAqACcAKQA7ACQA
  - JABGAGwAeAByAGgAYwBmAGQ
  - PQAkAGUAbgB2ADoAdABlAG0AcAArACgA
  - 0AJABlAG4AdgA6AHQAZQBtAHAAKwAoA
  - 9ACQAZQBuAHYAOgB0AGUAbQBwACsAKA
filter:
  CommandLine|contains:
  - fAAgAEMAbwBuAHYAZQByAHQAVABvAC0ASgBzAG8AbgAgAC0ARQByAHIAbwByAEEAYwB0AGkAbwBuACAAUwBpAGwAZQBuAHQAbAB5AEMAbwBuAHQAaQBuAHUAZQ
  - wAIABDAG8AbgB2AGUAcgB0AFQAbwAtAEoAcwBvAG4AIAAtAEUAcgByAG8AcgBBAGMAdABpAG8AbgAgAFMAaQBsAGUAbgB0AGwAeQBDAG8AbgB0AGkAbgB1AGUA
  - 8ACAAQwBvAG4AdgBlAHIAdABUAG8ALQBKAHMAbwBuACAALQBFAHIAcgBvAHIAQQBjAHQAaQBvAG4AIABTAGkAbABlAG4AdABsAHkAQwBvAG4AdABpAG4AdQBlA
condition: selection and not filter

Known false positives

  • Unlikely
Raw source Potential Emotet Activity · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Potential Emotet Activity
id: d02e8cf5-6099-48cf-9bfc-1eec2d0c7b18
status: stable
description: Detects all Emotet like process executions that are not covered by the more generic rules
references:
    - https://app.any.run/tasks/e13ab713-64cf-4b23-ad93-6dceaa5429ac/
    - https://app.any.run/tasks/81f3c28c-c686-425d-8a2b-a98198d244e1/
    - https://app.any.run/tasks/97f875e8-0e08-4328-815f-055e971ba754/
    - https://app.any.run/tasks/84fc9b4a-ea2b-47b1-8aa6-9014402dfb56/
author: Florian Roth (Nextron Systems)
date: 2019-09-30
modified: 2023-02-04
tags:
    - attack.execution
    - attack.stealth
    - attack.t1059.001
    - attack.t1027
    - detection.emerging-threats
logsource:
    category: process_creation
    product: windows
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
falsepositives:
    - Unlikely
level: high

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