Query: alert when Detects S3 Browser utility performing reconnaissance looking for existing IAM Users without a LoginProfile defined then
Matching passage: Sigma rule: Detects S3 Browser utility performing reconnaissance looking for existing IAM Users without a LoginProfile defined then. Logsource: aws / cloudtrail. Rule: title: AWS IAM S3Browser LoginProfile Creation id: db014773-b1d3-46bd-ba26-133337c0ffee status: test description: Detects S3 Browser utility performing reconnaissance looking for existing IAM Users without a LoginProfile defined then (when found) creating a LoginProfile. references: - https://permiso.io/blog/s/unmasking-guivil-new-cloud-threat-actor author: daniel.bohannon@permiso.io (@danielhbohannon) date: 2023-05-17 tags: - attack.execution - attack.persistence - attack.initial-access - attack.privilege-escalation - attack.stealth - attack.t1059.009 - attack.t1078.004 logsource: product: aws service: cloudtrail detection: selection: eventSource: iam.amazonaws.com eventName: - GetLoginProfile - CreateLoginProfile userAgent|contains: S3 Browser condition: selection falsepositives: - Valid usage of S3 Browser for IAM LoginProfile listing and/or creation level: high
Near-miss passage: Sigma rule: Detects an a non-browser process interacting with the Telegram API which could indicate use of a covert C2. Logsource: windows / network_connection. Rule: title: Suspicious Non-Browser Network Communication With Telegram API id: c3dbbc9f-ef1d-470a-a90a-d343448d5875 status: test description: Detects an a non-browser process interacting with the Telegram API which could indicate use of a covert C2 references: - https://www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/small-sieve/NCSC-MAR-Small-Sieve.pdf author: Nasreddine Bencherchali (Nextron Systems) date: 2023-05-19 tags: - attack.command-and-control - attack.exfiltration - attack.t1102 - attack.t1567 - attack.t1105 logsource: product: windows category: network_connection detection: selection: DestinationHostname|contains: api.telegram.org filter_main_brave: Image|endswith: \brave.exe filter_main_chrome: Image: - C:\Program Files\Google\Chrome\Application\chrome.exe - C:\Program Files (x86)\Google\Chrome\Application\chrome.exe filter_main_firefox: Image: - C:\Program Files\Mozilla Firefox\firefox.exe - C:\Program Files (x86)\Mozilla Firefox\firefox.exe filter_main_ie: Image: - C:\Program Files (x86)\Internet Explorer\iexplore.exe - C:\Program Files\Internet Explorer\iexplore.exe filter_main_maxthon: Image|endswith: \maxthon.exe filter_main_edge_1: - Image|startswith: C:\Program Files (x86)\Microsoft\EdgeWebView\Application\ - Image|endswith: \WindowsApps\MicrosoftEdge.exe - Image: - C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe - C:\Program Files\Microsoft\Edge\Application\msedge.exe filter_main_edge_2: Image|startswith: - C:\Program Files (x86)\Microsoft\EdgeCore\ - C:\Program Files\Microsoft\EdgeCore\ Image|endswith: - \msedge.exe - \msedgewebview2.exe filter_main_opera: Image|endswith: \opera.exe filter_main_safari: Image|endswith: \safari.exe filter_main_seamonkey: Image|endswith: \seamonkey.exe filter_main_vivaldi: Image|endswith: \vivaldi.exe filter_main_whale: Image|endswith: \whale.exe condition: selection and not 1 of filter_main_* falsepositives: - Legitimate applications communicating with the Telegram API e.g. web browsers not in the exclusion list, app with an RSS etc. level: medium