Synopsis
Activation Period |
14 Days |
Training Period |
30 Days |
Test Period |
N/A (single event) |
Deduplication Period |
1 Day |
Required Data |
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Detection Modules |
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Detector Tags |
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ATT&CK Tactic |
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ATT&CK Technique |
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Severity |
Low |
Description
Abnormal communication with a rare combination of TLS and HTTP User Agent to an external address.
Attacker's Goals
Data exfiltration, attack tool staging or command and control channel through a trusted service.
Investigative actions
- Examine the legitimacy of the application that produced this rare TLS fingerprint with the external server.
- Examine the parent process of this application.
- Check for anomalies at the time when the communication occurred.
- Verify if the outbound communication is being routed through a legitimate HTTP tunneling solution.
Variations
Abnormal communication with a rare combination of TLS and HTTP User Agent to an instant messaging serverAbnormal communication with a rare combination of TLS and HTTP User Agent to a globally rare domain