Malicious Data Exfiltration via Backblaze B2 CLI

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 the b2 command line client syncing local data to a b2 cloud bucket, an exfiltration path to attacker-controlled object storage. This was catalogued among data-exfiltration LOLBIN binaries used before extortion. Uploading internal files to Backblaze from servers or endpoints signals data theft.

Reporting behind it

Related detections9 linkedT1567.002 — drag to rearrange

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

Possible Gamaredon Dead-Drop C2 via Telegraph and GoFile Web Services

Suspicious Data Exfiltration via Rclone Remote Copy

Suspicious Data Exfiltration via rclone

Malicious Data Exfiltration via Backblaze B2 CLI

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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