Suspicious Data Exfiltration to Anonymous File Sharing Services (via dns_query)

ATT&CK techniques

Exfiltration

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
- T1567.002Exfiltration to Cloud Storage
Impact

What it detects

This rule detects DNS lookups for the anonfiles and bayfiles anonymous file sharing services, which the Cyclops stealer uses to upload harvested victim data over web services. Exfiltration to anonymous upload endpoints lets the attacker collect stolen credentials and documents while evading corporate data controls.

Reporting behind it

Related detections9 linkedT1567.002 — drag to rearrange

Malicious Bulk Data Exfiltration via Rclone (via process_creation)

Rclone SMB Share Exfiltration

Suspicious Data Exfiltration via Rclone to Cloud Storage (via process_creation)

Malicious Data Exfiltration via MEGAcmd

Suspicious Command and Control via Discord or Telegram Bot API

Data Exfiltration to WebDAV Share via curl Upload

Suspicious Data Exfiltration Tool S3 Browser Execution (via process_creation)

Suspicious Restic Cloud Backup Exfiltration via Renamed winupdate Binary via process_creation

Suspicious Data Exfiltration to Telegram Bot API sendDocument (via proxy)

Suspicious Data Exfiltration to Anonymous File Sharing Services (via dns_query)

Pivot detection · T1567.002 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →