Suspicious Downloaded Shell Stager Made Executable Via Chmod 777

ATT&CK techniques

Execution → C2

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

What it detects

This rule detects a shell retrieving a remote script with wget and immediately granting it world writable and executable permissions using chmod 777 which is the KAIJI stager delivery pattern in the Betting on Bots campaign. Adversaries download and mark payloads executable in one step to bootstrap further malware on the compromised Linux host.

Reporting behind it

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

Suspicious Downloaded Shell Stager Made Executable Via Chmod 777

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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