ZxShell Malware

calendar Jun 20, 2023 · attack.execution attack.t1059.003 attack.defense_evasion attack.t1218.011 attack.s0412 attack.g0001 detection.emerging_threats  ·
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Detects a ZxShell start by the called and well-known function name

Sigma rule (View on GitHub)

 1title: ZxShell Malware
 2id: f0b70adb-0075-43b0-9745-e82a1c608fcc
 3status: test
 4description: Detects a ZxShell start by the called and well-known function name
 5references:
 6    - https://www.hybrid-analysis.com/sample/5d2a4cde9fa7c2fdbf39b2e2ffd23378d0c50701a3095d1e91e3cf922d7b0b16?environmentId=100
 7    - https://pub-7cb8ac806c1b4c4383e585c474a24719.r2.dev/116309e7121bc8b0e66e4166c06f7b818e1d3629.pdf
 8author: Florian Roth (Nextron Systems), oscd.community, Jonhnathan Ribeiro
 9date: 2017/07/20
10modified: 2021/11/27
11tags:
12    - attack.execution
13    - attack.t1059.003
14    - attack.defense_evasion
15    - attack.t1218.011
16    - attack.s0412
17    - attack.g0001
18    - detection.emerging_threats
19logsource:
20    category: process_creation
21    product: windows
22detection:
23    selection:
24        Image|endswith: '\rundll32.exe'
25        CommandLine|contains:
26            - 'zxFunction'
27            - 'RemoteDiskXXXXX'
28    condition: selection
29fields:
30    - CommandLine
31    - ParentCommandLine
32falsepositives:
33    - Unlikely
34level: critical

References

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