Suspicious File Download to tmp and Quarantine Removal via curl and xattr

ATT&CK techniques

Execution → C2

Recon
Resource Dev
Initial Access
Execution
- T1059.004Unix Shell
Persistence
Priv Esc
Defense Evasion
- T1553.001Gatekeeper Bypass
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects a shell command that downloads a file into the tmp directory with curl, strips the macOS quarantine attribute with xattr, marks it executable and runs it. This chain is the macOS infection path from fake Claude Code advertisements delivering an AMOS style stealer.

Reporting behind it

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Suspicious File Download to tmp and Quarantine Removal via curl and xattr

Pivot detection · T1059.004 · 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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