Suspicious Data Exfiltration Tool S3 Browser Execution (via process_creation)

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 execution of the S3 Browser client, the third-party utility Muddled Libra uses to stage and exfiltrate collected data to attacker-controlled S3 buckets. Presence of S3 Browser on servers and admin hosts is abnormal and aligns with bulk cloud exfiltration after domain compromise.

Reporting behind it

Related detections9 linkedT1567.002 — drag to rearrange

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

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Data Exfiltration to WebDAV Share via curl Upload

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)

Suspicious Data Exfiltration Tool S3 Browser Execution (via process_creation)

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.

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