Sigma rule: Chafer Malware URL Pattern

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-41b4140e4ae1, updated 2024-02-15T00:00:00.000Z.

Rule

Title
Chafer Malware URL Pattern
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2019-01-31
Modified
2024-02-15
File
rules-emerging-threats/2019/Malware/Chafer/proxy_malware_chafer_url_pattern.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects HTTP request used by Chafer malware to receive data from its C2.

Log source

category
proxy

Detection

selection:
    c-uri|contains: '/asp.asp\?ui='
condition: selection

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.command-and-control
  • attack.t1071.001
  • detection.emerging-threats

MITRE ATT&CK ids this rule names

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/2019/Malware/Chafer/proxy_malware_chafer_url_pattern.yml

Sources and licences

  • SigmaHQ

    "Chafer Malware URL Pattern" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2019/Malware/Chafer/proxy_malware_chafer_url_pattern.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: Chafer Malware URL Pattern",
entity page, dataset version ref-41b4140e4ae1, updated 2024-02-15T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/fb502828-2db0-438e-93e6-801c7548686d (accessed 2026-11-03).
Underlying source: SigmaHQ rule fb502828-2db0-438e-93e6-801c7548686d, 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.