Abnormal communication with a rare combination of TLS and HTTP User Agent

Analytics BIOC Low

Abnormal communication with a rare combination of TLS and HTTP User Agent

Abnormal communication with a rare combination of TLS and HTTP User Agent to an external address.

Module:: Platform Analytics
Data source:: Palo Alto Networks Firewall EAL Logs, XDR Agent

ATT&CK tactics: Command and Control (TA0011) Exfiltration (TA0010)

ATT&CK techniques: Web Service (T1102) Exfiltration Over Web Service (T1567)

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.

Test period:: N/A (single event)
Deduplication:: 1 Day

2 variations:

Abnormal communication with a rare combination of TLS and HTTP User Agent to an instant messaging server Low
Abnormal communication with a rare combination of TLS and HTTP User Agent to a globally rare domain Low