Query: Sigma YAML for azure / activitylogs
Matching passage: Sigma rule: Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.. Logsource: azure / activitylogs. Rule: title: Azure Firewall Rule Collection Modified or Deleted id: 025c9fe7-db72-49f9-af0d-31341dd7dd57 status: test description: Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted. references: - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations author: Austin Songer @austinsonger date: 2021-08-08 modified: 2022-08-23 tags: - attack.impact - attack.defense-impairment - attack.t1686.001 logsource: product: azure service: activitylogs detection: selection: operationName: - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/WRITE - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/DELETE - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/WRITE - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/DELETE - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/WRITE - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/DELETE condition: selection falsepositives: - Rule Collections (Application, NAT, and Network) being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. - Rule Collections (Application, NAT, and Network) modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule. level: medium
Near-miss passage: Sigma rule: Detects execution of mshta.exe with file types that looks like they do not typically represent HTA (HTML Application) co. Logsource: windows / process_creation. Rule: title: MSHTA Execution with Suspicious File Extensions id: cc7abbd0-762b-41e3-8a26-57ad50d2eea3 status: test description: 'Detects execution of mshta.exe with file types that looks like they do not typically represent HTA (HTML Application) content, such as .png, .jpg, .zip, .pdf, and others, which are often polyglots. MSHTA is a legitimate Windows utility for executing HTML Applications containing VBScript or JScript. Threat actors often abuse this lolbin utility to download and execute malicious scripts disguised as benign files or hosted under misleading extensions to evade detection. ' references: - http://blog.sevagas.com/?Hacking-around-HTA-files - https://0x00sec.org/t/clientside-exploitation-in-2018-how-pentesting-has-changed/7356 - https://learn.microsoft.com/en-us/previous-versions/dotnet/framework/data/xml/xslt/xslt-stylesheet-scripting-using-msxsl-script - https://medium.com/tsscyber/pentesting-and-hta-bypassing-powershell-constrained-language-mode-53a42856c997 - https://twitter.com/mattifestation/status/1326228491302563846 - https://www.virustotal.com/gui/file/c1f27d9795a2eba630db8a043580a0761798f06370fb1317067805f8a845b00c author: Diego Perez (@darkquassar), Markus Neis, Swisscom (Improve Rule), Swachchhanda Shrawan Poudel (Nextron Systems) date: 2019-02-22 modified: 2025-05-12 tags: - attack.stealth - attack.t1140 - attack.t1218.005 - attack.execution - attack.t1059.007 - cve.2020-1599 logsource: category: process_creation product: windows detection: selection_img: - Image|endswith: \mshta.exe - OriginalFileName: mshta.exe selection_cli: CommandLine|contains: - .7z - .avi - .bat - .bmp - .conf - .csv - .dll - .doc - .gif - .gz - .ini - .jpe - .jpg - .json - .lnk - .log - .mkv - .mp3 - .mp4 - .pdf - .png - .ppt - .rar - .rtf - .svg - .tar - .tmp - .txt - .xls - .xml - .yaml - .yml - .zip - vbscript condition: all of selection_* falsepositives: - False positives depend on scripts and administrative tools used in the monitored environment level: high