Suspicious PowerShell Download of Bumblebee Stager Files (via process_creation)

ATT&CK techniques

C2

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

What it detects

This rule detects PowerShell referencing the stager filenames update_ver or w_ver.dat used in the Bumblebee delivery chain. These files were fetched from the download server before the Bumblebee DLL was executed.

Reporting behind it

Related detections9 linkedT1105 — drag to rearrange

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

Suspicious Payload Download from Transfer.sh After ScreenConnect Exploitation (via proxy)

Suspicious Python HTTP Server Staging for Payload Delivery

Suspicious Execution of PAN-OS Captive Portal Implant Binaries (via process_creation)

Possible Mirai IoT Payload Staging via chmod on Linux (via process_creation)

Malicious Payload Download From copy.fail Exploit Host on Linux (via process_creation)

Suspicious ClickFix cv.bat Staging in Temp via PowerShell (via process_creation)

Suspicious GeoServer Java Process Spawning Download Utility

Suspicious Script Host Downloader via MSXML and WScript Shell

Suspicious PowerShell Download of Bumblebee Stager Files (via process_creation)

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.

Full detection rule

Unlock this rule to view and copy it

The detection logic is included with a plan. Everything else — context, mappings and implementation details — stays free on this page.

Sign in for 3 free unlocks

Signing in gives you 3 unlocks to spend on any rule in the library. No card, and they do not expire.

Also included

Unlocked rules convert on this page — to Splunk SPL or Splunk — Raw Index SPL or Microsoft Sentinel KQL or Microsoft Sentinel ASIM ASIM KQL or Microsoft Defender XDR KQL or Elastic Security KQL or Elastic Security Lucene or Elastic Security ES|QL or CrowdStrike Falcon CQL or SentinelOne PowerQuery or Palo Alto Cortex XDR XQL or Carbon Black Cloud Platform Search or Carbon Black EDR Process Search or Google Security Operations UDM Search or IBM QRadar AQL or Sumo Logic Cloud SIEM Rules expression or Rapid7 InsightIDR LEQL or Graylog Search or OpenSearch Lucene or OpenSearch PPL PPL or Grafana Loki LogQL or SQLite SQL or Zircolite SQLite — with the log-source profile the engine picked, the field map it used, and everything it could not express. Converting a rule you have unlocked costs no further credit.

See it run on a free rule →Convert your own rule →