Query: alert when Detects execution of "Diskshadow.exe" in script mode to execute an script with a potentially uncommon extension. Initial
Matching passage: Sigma rule: Detects execution of "Diskshadow.exe" in script mode to execute an script with a potentially uncommon extension. Initial. Logsource: windows / process_creation. Rule: title: Diskshadow Script Mode - Uncommon Script Extension Execution id: 1dde5376-a648-492e-9e54-4241dd9b0c7f related: - id: fa1a7e52-3d02-435b-81b8-00da14dd66c1 type: similar - id: 9f546b25-5f12-4c8d-8532-5893dcb1e4b8 type: similar - id: 56b1dde8-b274-435f-a73a-fb75eb81262a type: similar - id: 0c2f8629-7129-4a8a-9897-7e0768f13ff2 type: similar status: test description: '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. ' 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/ author: Nasreddine Bencherchali (Nextron Systems) date: 2023-09-15 modified: 2024-03-05 tags: - attack.stealth - attack.t1218 logsource: category: process_creation product: windows detection: selection_img: - OriginalFileName: diskshadow.exe - Image|endswith: \diskshadow.exe selection_flag: CommandLine|contains|windash: '-s ' filter_main_ext: CommandLine|contains: .txt condition: all of selection_* and not 1 of filter_main_* falsepositives: - False postitve might occur with legitimate or uncommon extensions used internally. Initial baseline is required. level: medium
Near-miss passage: Sigma rule: Detects file downloads directly from IP address URL using curl.exe. Logsource: windows / process_creation. Rule: title: File Download From IP URL Via Curl.EXE id: 9cc85849-3b02-4cb5-b371-3a1ff54f2218 related: - id: 5cb299fc-5fb1-4d07-b989-0644c68b6043 type: similar status: test description: Detects file downloads directly from IP address URL using curl.exe references: - https://labs.withsecure.com/publications/fin7-target-veeam-servers - https://github.com/WithSecureLabs/iocs/blob/344203de742bb7e68bd56618f66d34be95a9f9fc/FIN7VEEAM/iocs.csv - https://github.com/pr0xylife/IcedID/blob/8dd1e218460db4f750d955b4c65b2f918a1db906/icedID_09.28.2023.txt author: Nasreddine Bencherchali (Nextron Systems) date: 2023-10-18 tags: - attack.execution logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \curl.exe - OriginalFileName: curl.exe selection_ip: CommandLine|re: ://[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3} selection_http: CommandLine|contains: http selection_flag: CommandLine|contains: - ' -O' - --remote-name - --output filter_main_ext: CommandLine|endswith: - .bat - .bat" - .dat - .dat" - .dll - .dll" - .exe - .exe" - .gif - .gif" - .hta - .hta" - .jpeg - .jpeg" - .log - .log" - .msi - .msi" - .png - .png" - .ps1 - .ps1" - .psm1 - .psm1" - .vbe - .vbe" - .vbs - .vbs" - .bat' - .dat' - .dll' - .exe' - .gif' - .hta' - .jpeg' - .log' - .msi' - .png' - .ps1' - .psm1' - .vbe' - .vbs' condition: all of selection_* and not 1 of filter_main_* falsepositives: - Unknown level: medium regression_tests_path: regression_data/rules/windows/process_creation/proc_creation_win_curl_download_direct_ip_exec/info.yml