Suspicious Download to tmp Followed by chmod Execution on Linux

ATT&CK techniques

Defense Evasion → C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
- T1222.002Linux and Mac Permissions
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1105Ingress Tool Transfer
Exfiltration
Impact

What it detects

This rule detects a single command line that downloads a file into a temporary directory and makes it executable. SSH compromise scripts fetch architecture specific botnet binaries into tmp with wget or curl and immediately grant execute permissions before launching them.

Reporting behind it

Related detections9 linkedT1105 — drag to rearrange

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Suspicious PowerShell Download Cradle via IEX and DownloadString (via process_creation)

Suspicious Remote File Download via certutil URLCache (via process_creation)

Suspicious WebDAV Retrieval via rundll32 and davclnt.dll (via process_creation)

Suspicious PowerShell Download to Temp and In-Memory Execution via IEX (via process_creation)

Suspicious PowerShell Download of Bumblebee Stager Files (via process_creation)

Suspicious Download to tmp Followed by chmod Execution on Linux

Pivot detection · T1105 · 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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