Diskshadow Script Mode - Uncommon Script Extension Execution

calendar Mar 11, 2024 · attack.defense_evasion attack.t1218  ·
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Detects execution of "Diskshadow.exe" in script mode to execute an script with a potentially uncommon extension. Initial baselining of the allowed extension list is required.

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 1title: Diskshadow Script Mode - Uncommon Script Extension Execution
 2id: 1dde5376-a648-492e-9e54-4241dd9b0c7f
 3related:
 4    - id: fa1a7e52-3d02-435b-81b8-00da14dd66c1 # Diskshadow Script Mode - Execution From Potential Suspicious Location
 5      type: similar
 6    - id: 9f546b25-5f12-4c8d-8532-5893dcb1e4b8 # Potentially Suspicious Child Process Of DiskShadow.EXE
 7      type: similar
 8    - id: 56b1dde8-b274-435f-a73a-fb75eb81262a # Diskshadow Child Process Spawned
 9      type: similar
10    - id: 0c2f8629-7129-4a8a-9897-7e0768f13ff2 # Diskshadow Script Mode Execution
11      type: similar
12status: experimental
13description: |
14    Detects execution of "Diskshadow.exe" in script mode to execute an script with a potentially uncommon extension.
15    Initial baselining of the allowed extension list is required.    
16references:
17    - https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/
18    - https://www.ired.team/offensive-security/credential-access-and-credential-dumping/ntds.dit-enumeration
19    - https://medium.com/@cyberjyot/lolbin-execution-via-diskshadow-f6ff681a27a4
20    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/diskshadow
21    - https://www.lifars.com/wp-content/uploads/2022/01/GriefRansomware_Whitepaper-2.pdf
22    - https://www.zscaler.com/blogs/security-research/technical-analysis-crytox-ransomware
23    - https://research.checkpoint.com/2022/evilplayout-attack-against-irans-state-broadcaster/
24author: Nasreddine Bencherchali (Nextron Systems)
25date: 2023/09/15
26modified: 2024/03/05
27tags:
28    - attack.defense_evasion
29    - attack.t1218
30logsource:
31    category: process_creation
32    product: windows
33detection:
34    selection_img:
35        - OriginalFileName: 'diskshadow.exe'
36        - Image|endswith: '\diskshadow.exe'
37    selection_flag:
38        CommandLine|contains|windash: '-s '
39    filter_main_ext:
40        # Note: can be changed to an "endswith" to avoid rare FPs. But you need to account for quoted paths
41        # Note: Using the ".txt" is based on the MS documentation example. Best add the extension you use internally before using this rule
42        CommandLine|contains: '.txt'
43    condition: all of selection_* and not 1 of filter_main_*
44falsepositives:
45    - False postitve might occur with legitimate or uncommon extensions used internally. Initial baseline is required.
46level: medium

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