Query: alert when Detects a non-browser process communicating with the Notion API. This could indicate potential use of a covert C2 channe
Matching passage: Sigma rule: Detects a non-browser process communicating with the Notion API. This could indicate potential use of a covert C2 channe. Logsource: windows / network_connection. Rule: title: Potentially Suspicious Network Connection To Notion API id: 7e9cf7b6-e827-11ed-a05b-15959c120003 status: test description: Detects a non-browser process communicating with the Notion API. This could indicate potential use of a covert C2 channel such as "OffensiveNotion C2" references: - https://github.com/mttaggart/OffensiveNotion - https://medium.com/@huskyhacks.mk/we-put-a-c2-in-your-notetaking-app-offensivenotion-3e933bace332 author: Gavin Knapp date: 2023-05-03 tags: - attack.command-and-control - attack.t1102 logsource: product: windows category: network_connection detection: selection: DestinationHostname|contains: api.notion.com filter_main_notion: Image|endswith: \AppData\Local\Programs\Notion\Notion.exe 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 "api.notion.com" endpoint that are not already in the exclusion list. The desktop and browser applications do not appear to be using the API by default unless integrations are configured. level: low
Near-miss passage: Sigma rule: Detects the installation of a DNS plugin DLL via ServerLevelPluginDll parameter in registry, which can be used to execut. Logsource: windows / registry_set. Rule: title: New DNS ServerLevelPluginDll Installed id: e61e8a88-59a9-451c-874e-70fcc9740d67 related: - id: cbe51394-cd93-4473-b555-edf0144952d9 type: derived - id: f63b56ee-3f79-4b8a-97fb-5c48007e8573 type: derived status: test description: Detects the installation of a DNS plugin DLL via ServerLevelPluginDll parameter in registry, which can be used to execute code in context of the DNS server (restart required) references: - https://medium.com/@esnesenon/feature-not-bug-dnsadmin-to-dc-compromise-in-one-line-a0f779b8dc83 - https://blog.3or.de/hunting-dns-server-level-plugin-dll-injection.html author: Florian Roth (Nextron Systems) date: 2017-05-08 modified: 2023-08-17 tags: - attack.privilege-escalation - attack.persistence - attack.execution - attack.stealth - attack.defense-impairment - attack.t1574.001 - attack.t1112 logsource: product: windows category: registry_set detection: selection: TargetObject|endswith: \services\DNS\Parameters\ServerLevelPluginDll condition: selection falsepositives: - Unknown level: high