Query: write Sigma for Detects a commandline containing references to the Microsoft Teams database or cookies files from a process other than T
Matching passage: Sigma rule: Detects a commandline containing references to the Microsoft Teams database or cookies files from a process other than T. Logsource: windows / process_creation. Rule: title: Potentially Suspicious Command Targeting Teams Sensitive Files id: d2eb17db-1d39-41dc-b57f-301f6512fa75 status: test description: 'Detects a commandline containing references to the Microsoft Teams database or cookies files from a process other than Teams. The database might contain authentication tokens and other sensitive information about the logged in accounts. ' references: - https://www.bleepingcomputer.com/news/security/microsoft-teams-stores-auth-tokens-as-cleartext-in-windows-linux-macs/ - https://www.vectra.ai/blogpost/undermining-microsoft-teams-security-by-mining-tokens author: '@SerkinValery' date: 2022-09-16 modified: 2023-12-18 tags: - attack.credential-access - attack.t1528 logsource: product: windows category: process_creation detection: selection: CommandLine|contains: - \Microsoft\Teams\Cookies - \Microsoft\Teams\Local Storage\leveldb filter_main_legit_locations: Image|endswith: \Microsoft\Teams\current\Teams.exe condition: selection and not 1 of filter_main_* falsepositives: - Unknown level: medium
Near-miss passage: Sigma rule: Detects modifications or creations of Windows Defender's default threat action settings based on severity to 'allow' or. Logsource: windows / registry_event. Rule: title: Windows Defender Threat Severity Default Action Modified id: 5a9e1b2c-8f7d-4a1e-9b3c-0f6d7e5a4b1f related: - id: 1e8a9b4d-3c2a-4f9b-8d1e-7c6a5b4f3d2e type: similar status: experimental description: 'Detects modifications or creations of Windows Defender''s default threat action settings based on severity to ''allow'' or take ''no action''. This is a highly suspicious configuration change that effectively disables Defender''s ability to automatically mitigate threats of a certain severity level, allowing malicious software to run unimpeded. An attacker might use this technique to bypass defenses before executing payloads. ' references: - https://learn.microsoft.com/en-us/powershell/module/defender/set-mppreference - https://learn.microsoft.com/en-us/windows-hardware/customize/desktop/unattend/security-malware-windows-defender-threatseveritydefaultaction - https://research.splunk.com/endpoint/7215831c-8252-4ae3-8d43-db588e82f952 - https://gist.github.com/Dump-GUY/8daef859f382b895ac6fd0cf094555d2 - https://thedfirreport.com/2021/10/18/icedid-to-xinglocker-ransomware-in-24-hours/ author: Matt Anderson (Huntress) date: 2025-07-11 tags: - attack.defense-impairment - attack.t1685 logsource: category: registry_event product: windows detection: selection: TargetObject|contains: \Microsoft\Windows Defender\Threats\ThreatSeverityDefaultAction\ TargetObject|endswith: - \1 - \2 - \4 - \5 Details: - DWORD (0x00000006) - DWORD (0x00000009) condition: selection falsepositives: - Legitimate administration via scripts or tools (e.g., SCCM, Intune, GPO enforcement). Correlate with administrative activity. - Software installations that legitimately modify Defender settings (less common for these specific keys). level: high