Malicious C2 Communication via M-RED-TEAM User Agent (via proxy)

ATT&CK techniques

C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1071.001Web Protocols
Exfiltration
Impact

What it detects

This rule detects outbound HTTP traffic carrying the hardcoded M-RED-TEAM user-agent tag used by the AsyncAPI supply-chain implant for command-and-control. The distinctive agent string identifies beaconing from the compromised host. This constant is tool-specific and rarely appears in legitimate traffic.

Reporting behind it

Related detections9 linkedT1071.001 — drag to rearrange

Suspicious Bash Reverse Shell via Dev TCP Redirection

Malicious TeamPCP antv Backup C2 Domain m-kosche (via dns_query)

Malicious Axios npm Compromise C2 Beacon to sfrclak and callnrwise (via dns_query)

Malicious TeamPCP durabletask C2 git-service and m-kosche (via dns_query)

Possible PowerShell Empire Default C2 URI Beaconing

Malicious GhostLocker Ransomware C2 Communication via HTTP (via proxy)

Malicious Agent Tesla Loader Malformed User-Agent in HTTP Traffic (via proxy)

Malicious Interlock RAT FileFix Download-Cradle via PowerShell WebClient with PowerShell User-Agent (via ps_script)

Suspicious Cobalt Strike Malleable Profile Beaconing via Legacy MSIE9 User-Agent and IE Compatibility URIs (via proxy)

Malicious C2 Communication via M-RED-TEAM User Agent (via proxy)

Pivot detection · T1071.001 · 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 →