{"id":"1dde5376-a648-492e-9e54-4241dd9b0c7f","title":"Diskshadow Script Mode - Uncommon Script Extension Execution","description":"Detects execution of \"Diskshadow.exe\" in script mode to execute an script with a potentially uncommon extension.\nInitial baselining of the allowed extension list is required.\n","author":"Nasreddine Bencherchali (Nextron Systems)","status":"test","level":"medium","date":"2023-09-15","modified":"2024-03-05","tags":["attack.stealth","attack.t1218"],"technique_ids":["T1218"],"logsource":{"category":"process_creation","product":"windows"},"falsepositives":["False postitve might occur with legitimate or uncommon extensions used internally. Initial baseline is required."],"references":["https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/","https://www.ired.team/offensive-security/credential-access-and-credential-dumping/ntds.dit-enumeration","https://medium.com/@cyberjyot/lolbin-execution-via-diskshadow-f6ff681a27a4","https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/diskshadow","https://www.lifars.com/wp-content/uploads/2022/01/GriefRansomware_Whitepaper-2.pdf","https://www.zscaler.com/blogs/security-research/technical-analysis-crytox-ransomware","https://research.checkpoint.com/2022/evilplayout-attack-against-irans-state-broadcaster/"],"source_path":"rules/windows/process_creation/proc_creation_win_diskshadow_script_mode_susp_ext.yml","source_sha256":"2f3b994e989be731b10781b00db520ff5463dd01c95e4765727c472dc490243e","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/windows/process_creation/proc_creation_win_diskshadow_script_mode_susp_ext.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Diskshadow Script Mode - Uncommon Script Extension Execution\nid: 1dde5376-a648-492e-9e54-4241dd9b0c7f\nrelated:\n    - id: fa1a7e52-3d02-435b-81b8-00da14dd66c1 # Diskshadow Script Mode - Execution From Potential Suspicious Location\n      type: similar\n    - id: 9f546b25-5f12-4c8d-8532-5893dcb1e4b8 # Potentially Suspicious Child Process Of DiskShadow.EXE\n      type: similar\n    - id: 56b1dde8-b274-435f-a73a-fb75eb81262a # Diskshadow Child Process Spawned\n      type: similar\n    - id: 0c2f8629-7129-4a8a-9897-7e0768f13ff2 # Diskshadow Script Mode Execution\n      type: similar\nstatus: test\ndescription: |\n    Detects execution of \"Diskshadow.exe\" in script mode to execute an script with a potentially uncommon extension.\n    Initial baselining of the allowed extension list is required.\nreferences:\n    - https://bohops.com/2018/03/26/diskshadow-the-return-of-vss-evasion-persistence-and-active-directory-database-extraction/\n    - https://www.ired.team/offensive-security/credential-access-and-credential-dumping/ntds.dit-enumeration\n    - https://medium.com/@cyberjyot/lolbin-execution-via-diskshadow-f6ff681a27a4\n    - https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/diskshadow\n    - https://www.lifars.com/wp-content/uploads/2022/01/GriefRansomware_Whitepaper-2.pdf\n    - https://www.zscaler.com/blogs/security-research/technical-analysis-crytox-ransomware\n    - https://research.checkpoint.com/2022/evilplayout-attack-against-irans-state-broadcaster/\nauthor: Nasreddine Bencherchali (Nextron Systems)\ndate: 2023-09-15\nmodified: 2024-03-05\ntags:\n    - attack.stealth\n    - attack.t1218\nlogsource:\n    category: process_creation\n    product: windows\ndetection:\n    selection_img:\n        - OriginalFileName: 'diskshadow.exe'\n        - Image|endswith: '\\diskshadow.exe'\n    selection_flag:\n        CommandLine|contains|windash: '-s '\n    filter_main_ext:\n        # Note: can be changed to an \"endswith\" to avoid rare FPs. But you need to account for quoted paths\n        # Note: Using the \".txt\" is based on the MS documentation example. Best add the extension you use internally before using this rule\n        CommandLine|contains: '.txt'\n    condition: all of selection_* and not 1 of filter_main_*\nfalsepositives:\n    - False postitve might occur with legitimate or uncommon extensions used internally. Initial baseline is required.\nlevel: medium\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1218","id":"T1218","name":"System Binary Proxy Execution","page":"techniques/enterprise/T1218/"}],"data_path":"data/detection-rules/1dde5376-a648-492e-9e54-4241dd9b0c7f.json","kind":"sigma"}