Suspicious Java Runtime Executing JAR from User Download or Temp Directory

ATT&CK techniques

Execution

Recon
Resource Dev
Initial Access
Execution
- T1059Command and Scripting Interpreter
- T1204.002Malicious File
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact

What it detects

This rule detects java.exe or javaw.exe running a JAR file from a user download, Temp or AppData path, the execution stage of the Java RAT delivered through HTML smuggling in tax themed phishing. A JRE launching a JAR from a download folder is a common cross platform RAT delivery pattern rather than normal application behavior.

Reporting behind it

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Suspicious Java Runtime Executing JAR from User Download or Temp Directory

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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