Internet Explorer Autorun Keys Modification

Detects modification of autostart extensibility point (ASEP) in registry.

Sigma rule (View on GitHub)

 1title: Internet Explorer Autorun Keys Modification
 2id: a80f662f-022f-4429-9b8c-b1a41aaa6688
 3related:
 4    - id: 17f878b8-9968-4578-b814-c4217fc5768c
 5      type: obsoletes
 6status: test
 7description: Detects modification of autostart extensibility point (ASEP) in registry.
 8references:
 9    - https://github.com/redcanaryco/atomic-red-team/blob/f339e7da7d05f6057fdfcdd3742bfcf365fee2a9/atomics/T1547.001/T1547.001.md
10    - https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns
11    - https://gist.github.com/GlebSukhodolskiy/0fc5fa5f482903064b448890db1eaf9d # a list with registry keys
12author: Victor Sergeev, Daniil Yugoslavskiy, Gleb Sukhodolskiy, Timur Zinniatullin, oscd.community, Tim Shelton, frack113 (split)
13date: 2019/10/25
14modified: 2023/08/17
15tags:
16    - attack.persistence
17    - attack.t1547.001
18logsource:
19    category: registry_set
20    product: windows
21detection:
22    ie:
23        TargetObject|contains:
24            - '\Software\Wow6432Node\Microsoft\Internet Explorer'
25            - '\Software\Microsoft\Internet Explorer'
26    ie_details:
27        TargetObject|contains:
28            - '\Toolbar'
29            - '\Extensions'
30            - '\Explorer Bars'
31    filter_empty:
32        Details: '(Empty)'
33    filter_extensions:
34        TargetObject|contains:
35            - '\Extensions\{2670000A-7350-4f3c-8081-5663EE0C6C49}'
36            - '\Extensions\{31D09BA0-12F5-4CCE-BE8A-2923E76605DA}'
37            - '\Extensions\{789FE86F-6FC4-46A1-9849-EDE0DB0C95CA}'
38            - '\Extensions\{A95fe080-8f5d-11d2-a20b-00aa003c157a}'
39    filter_toolbar:
40        TargetObject|endswith:
41            - '\Toolbar\ShellBrowser\ITBar7Layout'
42            - '\Toolbar\ShowDiscussionButton'
43            - '\Toolbar\Locked'
44    condition: ie and ie_details and not 1 of filter_*
45fields:
46    - SecurityID
47    - ObjectName
48    - OldValueType
49    - NewValueType
50falsepositives:
51    - Legitimate software automatically (mostly, during installation) sets up autorun keys for legitimate reason
52    - Legitimate administrator sets up autorun keys for legitimate reason
53level: medium

References

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