Potential RipZip Attack on Startup Folder

calendar Nov 2, 2023 · attack.persistence attack.t1547  ·
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Detects a phishing attack which expands a ZIP file containing a malicious shortcut. If the victim expands the ZIP file via the explorer process, then the explorer process expands the malicious ZIP file and drops a malicious shortcut redirected to a backdoor into the Startup folder. Additionally, the file name of the malicious shortcut in Startup folder contains {0AFACED1-E828-11D1-9187-B532F1E9575D} meaning the folder shortcut operation.

Sigma rule (View on GitHub)

 1title: Potential RipZip Attack on Startup Folder
 2id: a6976974-ea6f-4e97-818e-ea08625c52cb
 3status: test
 4description: |
 5    Detects a phishing attack which expands a ZIP file containing a malicious shortcut.
 6    If the victim expands the ZIP file via the explorer process, then the explorer process expands the malicious ZIP file and drops a malicious shortcut redirected to a backdoor into the Startup folder.
 7    Additionally, the file name of the malicious shortcut in Startup folder contains {0AFACED1-E828-11D1-9187-B532F1E9575D} meaning the folder shortcut operation.    
 8references:
 9    - https://twitter.com/jonasLyk/status/1549338335243534336?t=CrmPocBGLbDyE4p6zTX1cg&s=19
10author: Greg (rule)
11date: 2022/07/21
12modified: 2023/01/05
13tags:
14    - attack.persistence
15    - attack.t1547
16logsource:
17    category: file_event
18    product: windows
19detection:
20    selection: # %APPDATA%\Microsoft\Windows\Start Menu\Programs\Startup\target.lnk.{0AFACED1-E828-11D1-9187-B532F1E9575D}\target.lnk
21        TargetFilename|contains|all:
22            - '\Microsoft\Windows\Start Menu\Programs\Startup'
23            - '.lnk.{0AFACED1-E828-11D1-9187-B532F1E9575D}'
24        Image|endswith: '\explorer.exe'
25    condition: selection
26falsepositives:
27    - Unknown
28level: high

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