Suspicious Non-Browser Network Communication With Telegram API

Detects an a non-browser process interacting with the Telegram API which could indicate use of a covert C2

Detection logic

Platform: ESXi Linux macOS Network Devices Office Suite SaaS Windows
The rule states no platform. This is derived from the 3 ATT&CK techniques it maps to.
Log source product: windows
Log source category: network_connection

Legitimate applications communicating with the Telegram API e.g. web browsers not in the exclusion list, app with an RSS etc.

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
www.ncsc.gov.uk/static-assets/documents/malware-analysis-reports/small-sieve/NCSC-MAR-Small-Sieve.pdf	Unclassified	Only this detection cites it