Query: Sigma YAML for windows / file_access
Matching passage: Sigma rule: Detects file access to browser credential storage paths by non-browser processes, which may indicate credential access a. Logsource: windows / file_access. Rule: title: Suspicious File Access to Browser Credential Storage id: a1dfd976-4852-41d4-9507-dc6590a3ccd0 status: experimental description: 'Detects file access to browser credential storage paths by non-browser processes, which may indicate credential access attempts. Adversaries may attempt to access browser credential storage to extract sensitive information such as usernames and passwords or cookies. This behavior is often commonly observed in credential stealing malware. ' references: - https://github.com/splunk/security_content/blob/7283ba3723551f46b69dfeb23a63b358afb2cb0e/lookups/browser_app_list.csv?plain=1 - https://fourcore.io/blogs/threat-hunting-browser-credential-stealing author: frack113, X__Junior (Nextron Systems), Swachchhanda Shrawan Poudel (Nextron Systems), Parth-FourCore date: 2025-05-22 tags: - attack.credential-access - attack.t1555.003 - attack.discovery - attack.t1217 logsource: category: file_access product: windows detection: selection_browser_paths: FileName|contains: - \Sputnik\Sputnik - \MapleStudio\ChromePlus - \QIP Surf - \BlackHawk - \7Star\7Star - \CatalinaGroup\Citrio - \Google\Chrome - \Coowon\Coowon - \CocCoc\Browser - \uCozMedia\Uran - \Tencent\QQBrowser - \Orbitum - \Slimjet - \Iridium - \Vivaldi - \Chromium - \GhostBrowser - \CentBrowser - \Xvast - \Chedot - \SuperBird - \360Browser\Browser - \360Chrome\Chrome - \Comodo\Dragon - \BraveSoftware\Brave-Browser - \Torch - \UCBrowser\ - \Blisk - \Epic Privacy Browser - \Nichrome - \Amigo - \Kometa - \Xpom - \Microsoft\Edge - \Liebao7Default\EncryptedStorage - \AVAST Software\Browser - \Kinza - \Mozilla\SeaMonkey\ - \Comodo\IceDragon\ - \8pecxstudios\Cyberfox\ - \FlashPeak\SlimBrowser\ - \Moonchild Productions\Pale Moon\ selection_browser_subpaths: FileName|contains: - \Profiles\ - \User Data selection_cred_files: - FileName|contains: - \Login Data - \Cookies - \EncryptedStorage - \WebCache\ - FileName|endswith: - cert9.db - cookies.sqlite - formhistory.sqlite - key3.db - key4.db - Login Data.sqlite - logins.json - places.sqlite filter_main_img: Image|endswith: - \Sputnik.exe - \ChromePlus.exe - \QIP Surf.exe - \BlackHawk.exe - \7Star.exe - \Sleipnir5.exe - \Citrio.exe - \Chrome SxS.exe - \Chrome.exe - \Coowon.exe - \CocCocBrowser.exe - \Uran.exe - \QQBrowser.exe - \Orbitum.exe - \Slimjet.exe - \Iridium.exe - \Vivaldi.exe - \Chromium.exe - \GhostBrowser.exe - \CentBrowser.exe - \Xvast.exe - \Chedot.exe - \SuperBird.exe - \360Browser.exe - \360Chrome.exe - \dragon.exe - \brave.e
Near-miss passage: Sigma rule: Detects file access requests to the the Windows Data Protection API Master keys by an uncommon application. This can be. Logsource: windows / file_access. Rule: title: Access To Windows DPAPI Master Keys By Uncommon Applications id: 46612ae6-86be-4802-bc07-39b59feb1309 status: test description: 'Detects file access requests to the the Windows Data Protection API Master keys by an uncommon application. This can be a sign of credential stealing. Example case would be usage of mimikatz "dpapi::masterkey" function ' references: - http://blog.harmj0y.net/redteaming/operational-guidance-for-offensive-user-dpapi-abuse/ - https://book.hacktricks.xyz/windows-hardening/windows-local-privilege-escalation/dpapi-extracting-passwords author: Nasreddine Bencherchali (Nextron Systems) date: 2022-10-17 modified: 2026-07-28 tags: - attack.credential-access - attack.t1555.004 logsource: category: file_access product: windows definition: 'Requirements: Microsoft-Windows-Kernel-File ETW provider' detection: selection: FileName|contains: - \Microsoft\Protect\S-1-5-18\ - \Microsoft\Protect\S-1-5-21- filter_main_system_folders: Image|startswith: - C:\Program Files\ - C:\Program Files (x86)\ - C:\Windows\system32\ - C:\Windows\SysWOW64\ filter_main_explorer: Image: C:\Windows\explorer.exe condition: selection and not 1 of filter_main_* falsepositives: - Unknown level: medium