Potential Emotet Activity

calendar Jun 20, 2023 · attack.execution attack.t1059.001 attack.defense_evasion attack.t1027 detection.emerging_threats  ·
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Detects all Emotet like process executions that are not covered by the more generic rules

Sigma rule (View on GitHub)

 1title: Potential Emotet Activity
 2id: d02e8cf5-6099-48cf-9bfc-1eec2d0c7b18
 3status: stable
 4description: Detects all Emotet like process executions that are not covered by the more generic rules
 5references:
 6    - https://app.any.run/tasks/e13ab713-64cf-4b23-ad93-6dceaa5429ac/
 7    - https://app.any.run/tasks/81f3c28c-c686-425d-8a2b-a98198d244e1/
 8    - https://app.any.run/tasks/97f875e8-0e08-4328-815f-055e971ba754/
 9    - https://app.any.run/tasks/84fc9b4a-ea2b-47b1-8aa6-9014402dfb56/
10author: Florian Roth (Nextron Systems)
11date: 2019/09/30
12modified: 2023/02/04
13tags:
14    - attack.execution
15    - attack.t1059.001
16    - attack.defense_evasion
17    - attack.t1027
18    - detection.emerging_threats
19logsource:
20    category: process_creation
21    product: windows
22detection:
23    selection:
24        CommandLine|contains:
25            - ' -e* PAA'
26            - 'JABlAG4AdgA6AHUAcwBlAHIAcAByAG8AZgBpAGwAZQ' # $env:userprofile
27            - 'QAZQBuAHYAOgB1AHMAZQByAHAAcgBvAGYAaQBsAGUA' # $env:userprofile
28            - 'kAGUAbgB2ADoAdQBzAGUAcgBwAHIAbwBmAGkAbABlA' # $env:userprofile
29            - 'IgAoACcAKgAnACkAOwAkA' # "('*');$
30            - 'IAKAAnACoAJwApADsAJA' # "('*');$
31            - 'iACgAJwAqACcAKQA7ACQA' # "('*');$
32            - 'JABGAGwAeAByAGgAYwBmAGQ'
33            - 'PQAkAGUAbgB2ADoAdABlAG0AcAArACgA' # =$env:temp+(
34            - '0AJABlAG4AdgA6AHQAZQBtAHAAKwAoA' # =$env:temp+(
35            - '9ACQAZQBuAHYAOgB0AGUAbQBwACsAKA' # =$env:temp+(
36    filter:
37        CommandLine|contains:
38            - 'fAAgAEMAbwBuAHYAZQByAHQAVABvAC0ASgBzAG8AbgAgAC0ARQByAHIAbwByAEEAYwB0AGkAbwBuACAAUwBpAGwAZQBuAHQAbAB5AEMAbwBuAHQAaQBuAHUAZQ'
39            - 'wAIABDAG8AbgB2AGUAcgB0AFQAbwAtAEoAcwBvAG4AIAAtAEUAcgByAG8AcgBBAGMAdABpAG8AbgAgAFMAaQBsAGUAbgB0AGwAeQBDAG8AbgB0AGkAbgB1AGUA'
40            - '8ACAAQwBvAG4AdgBlAHIAdABUAG8ALQBKAHMAbwBuACAALQBFAHIAcgBvAHIAQQBjAHQAaQBvAG4AIABTAGkAbABlAG4AdABsAHkAQwBvAG4AdABpAG4AdQBlA'
41    condition: selection and not filter
42fields:
43    - CommandLine
44    - ParentCommandLine
45falsepositives:
46    - Unlikely
47level: high

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