A browser extension was installed or loaded in an uncommon way

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	Chromium Extensions Analytics
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Software Extensions: Browser Extensions (T1176.001)
Severity	Informational

Description

A browser extension was installed or loaded in an uncommon way.

Attacker's Goals

• Gain persistency on a machine and steal sensitive browsing data.

Investigative actions

• Investigate the extension files and the process that installed them.
• Check if this extension is currently present at the relevant extensions web store by looking up for its extension ID.

Variations

A browser was forced to load an extension using a special command line argument

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Software Extensions: Browser Extensions (T1176.001)
Severity	Low

Description

A browser was forced to load an extension using a special command line argument, an uncommon method.

Attacker's Goals

• Gain persistency on a machine and steal sensitive browsing data.

Investigative actions

• Investigate the extension files and the process that installed them.
• Check if this extension is currently present at the relevant extensions web store by looking up for its extension ID.

A browser extension was installed or loaded in an uncommon way by a LOLBIN process

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Software Extensions: Browser Extensions (T1176.001)
Severity	Low

Description

A browser extension was installed or loaded in an uncommon way.

Attacker's Goals

• Gain persistency on a machine and steal sensitive browsing data.

Investigative actions

• Investigate the extension files and the process that installed them.
• Check if this extension is currently present at the relevant extensions web store by looking up for its extension ID.

A browser extension was installed or loaded in an uncommon way by an uncommon process

Synopsis

Field	Value
ATT&CK Tactic	Persistence (TA0003)
ATT&CK Technique	Software Extensions: Browser Extensions (T1176.001)
Severity	Low

Description

A browser extension was installed or loaded in an uncommon way.

Attacker's Goals

• Gain persistency on a machine and steal sensitive browsing data.

Investigative actions

• Investigate the extension files and the process that installed them.
• Check if this extension is currently present at the relevant extensions web store by looking up for its extension ID.