Malicious Data Exfiltration via curl with Stealer Specific BuildID Header

ATT&CK techniques

Execution → Exfiltration

Recon
Resource Dev
Initial Access
Execution
- T1059.002AppleScript
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1071.001Web Protocols
Exfiltration
- T1567Exfiltration Over Web Service
Impact

What it detects

This rule detects curl invoked with the custom BuildID or buildid HTTP header used by the Atomic and Odyssey macOS information stealers to exfiltrate collected data to their command and control servers. These distinctive headers identify the stealer build during the collection upload. Detecting them surfaces active credential and data theft on macOS endpoints.

Reporting behind it

Related detections9 linkedT1071.001 — drag to rearrange

Malicious Sapphire Sleet curl to osascript Chain With mac-cur User-Agent (via process_creation)

Malicious Mini Shai-Hulud TanStack C2 git-tanstack and getsession (via dns_query)

Malicious TeamPCP LiteLLM Credential Exfiltration C2 Lookup (via dns_query)

Malicious TeamPCP Trivy C2 Beacon to ICP Canister and Cloudflare Tunnel (via dns_query)

Suspicious osascript Password Prompt via AppleScript Display Dialog (via process_creation)

Suspicious Shadow File Exfiltration Over Dev TCP on Linux via Process Creation (via process_creation)

Suspicious Netcat Reverse Shell via Named Pipe on Linux via Process Creation (via process_creation)

Malicious GenAI Browser Extension C2 and PAC Redirection (via proxy)

Possible Prometei Botnet C2 URI Pattern

Malicious Data Exfiltration via curl with Stealer Specific BuildID Header

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 →