Sigma rule: Small Sieve Malware Potential C2 Communication

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-1a68d50b61b6, updated 2023-05-19T00:00:00.000Z.

Rule

Title
Small Sieve Malware Potential C2 Communication
Status
test
Level
critical
Author
Nasreddine Bencherchali (Nextron Systems)
Date
2023-05-19
File
rules-emerging-threats/2021/Malware/Small-Sieve/proxy_malware_small_sieve_telegram_communication.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects potential C2 communication related to Small Sieve malware

Log source

category
proxy

Detection

selection:
    cs-method: 'GET'
    cs-host: 'api.telegram.org'
    cs-uri|contains|all:
        - 'chat_id=2090761833'
        - 'text=com/'
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.command-and-control
  • detection.emerging-threats

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Small-Sieve/proxy_malware_small_sieve_telegram_communication.yml

Sources and licences

  • SigmaHQ

    "Small Sieve Malware Potential C2 Communication" by Nasreddine Bencherchali (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2021/Malware/Small-Sieve/proxy_malware_small_sieve_telegram_communication.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Small Sieve Malware Potential C2 Communication",
entity page, dataset version ref-1a68d50b61b6, updated 2023-05-19T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/b0422664-37a4-4e78-949a-4a139309eaf0 (accessed 2026-11-03).
Underlying source: SigmaHQ rule b0422664-37a4-4e78-949a-4a139309eaf0, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.