Suspicious Base64 Bash Execution via nohup on macOS via ClickFix (via process_creation)

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059.004Unix Shell
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects a detached bash process decoding a Base64 payload via nohup on macOS, matching the Odyssey stealer delivery produced by the IUAM ClickFix Generator for Apple systems. The lure instructs victims to paste a terminal command that background-executes an obfuscated downloader. Detecting this pattern surfaces cross-platform ClickFix infections targeting macOS users.

Reporting behind it

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Suspicious Base64 Bash Execution via nohup on macOS via ClickFix (via process_creation)

Pivot detection · T1204.002 · 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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