Suspicious Java Runtime Executing JAR from User Download or Temp Directory
- Product
- windows
- Category
- process_creation
- Author
- HuntRule
- Published
- 2026-06-12
- Updated
- 2026-08-28
ATT&CK techniques
ExecutionRecon
Resource Dev
Initial Access
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
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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