Unusual process accessed web browser cookies

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	1 Day
Required Data	XDR Agent with eXtended Threat Hunting (XTH)
Detector Tags	Credentials Grabbing Analytics
ATT&CK Tactic	Credential Access (TA0006)
ATT&CK Technique	Steal Web Session Cookie (T1539)
Severity	Informational

Description

An unusual process has accessed a web browser's session cookie store.

Attacker's Goals

Obtain access to or hijack sessions to websites stored in the web browser's cookies.

Investigative actions

• Determine whether it is legitimate for the process to access session cookies directly.
• Analyze the process/application that accessed the cookie store.
• Check for any other suspicious actions that were performed by the process.
• Look for unusual access to resources using credentials cached in the web browser/cookie store.

Variations

Unusual unsigned process accessed web browser cookies

Synopsis

Field	Value
ATT&CK Tactic	Credential Access (TA0006)
ATT&CK Technique	Steal Web Session Cookie (T1539)
Severity	Low

Description

An unusual process has accessed a web browser's session cookie store.

Attacker's Goals

Obtain access to or hijack sessions to websites stored in the web browser's cookies.

Investigative actions

• Determine whether it is legitimate for the process to access session cookies directly.
• Analyze the process/application that accessed the cookie store.
• Check for any other suspicious actions that were performed by the process.
• Look for unusual access to resources using credentials cached in the web browser/cookie store.