Query: Sigma rule for Detects an a non-browser process interacting with the Telegram API which could indicate use of a covert C2
Matching 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
Near-miss passage: Sigma rule: Detects suspicious application installed by looking at the added shortcut to the app resolver cache. Logsource: windows / shell-core. Rule: title: Suspicious Application Installed id: 83c161b6-ca67-4f33-8ad0-644a0737cf07 status: test description: Detects suspicious application installed by looking at the added shortcut to the app resolver cache references: - https://nasbench.medium.com/finding-forensic-goodness-in-obscure-windows-event-logs-60e978ea45a3 author: Nasreddine Bencherchali (Nextron Systems) date: 2022-08-14 tags: - attack.execution logsource: product: windows service: shell-core detection: selection_name: EventID: 28115 Name|contains: - Zenmap - AnyDesk - wireshark - openvpn selection_packageid: EventID: 28115 AppID|contains: - zenmap.exe - prokzult ad - wireshark - openvpn condition: 1 of selection_* falsepositives: - Packages or applications being legitimately used by users or administrators level: medium