Uncommon network tunnel creation

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	12 Hours
Required Data	Palo Alto Networks Url Logs
ATT&CK Tactic	Command and Control (TA0011)
ATT&CK Technique	Protocol Tunneling (T1572)
Severity	Informational

Description

An uncommon network tunnel was established.

Attacker's Goals

Attackers may use SSH or any similar utility to create a network tunnel to allow an attacker to covertly connect to an internal host.

Investigative actions

• Review the external IP/domain using known intelligence tools.
• Investigate the causality of the process and its user ID to find uncommon behaviors.
• Search for processes or files that were created by this SSH instance.

Variations

Uncommon network tunnel creation

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011)
ATT&CK Technique	Protocol Tunneling (T1572)
Severity	Informational

Description

An uncommon network tunnel was established using ACS_ssh.exe.

Attacker's Goals

Attackers may use SSH or any similar utility to create a network tunnel to allow an attacker to covertly connect to an internal host.

Investigative actions

• Review the external IP/domain using known intelligence tools.
• Investigate the causality of the process and its user ID to find uncommon behaviors.
• Search for processes or files that were created by this SSH instance.

Uncommon SSH tunnel to unpopular IP address

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011)
ATT&CK Technique	Protocol Tunneling (T1572)
Severity	Low

Description

An uncommon SSH tunnel was established to an unpopular remote IP address at the organization.

Attacker's Goals

Attackers may use SSH or any similar utility to create a network tunnel to allow an attacker to covertly connect to an internal host.

Investigative actions

• Review the external IP/domain using known intelligence tools.
• Investigate the causality of the process and its user ID to find uncommon behaviors.
• Search for processes or files that were created by this SSH instance.

An uncommon network tunnel was established over the default SSH port

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011)
ATT&CK Technique	Protocol Tunneling (T1572)
Severity	Low

Description

An unpopular process and command line created a network tunnel over the default SSH port.

Attacker's Goals

Attackers may use SSH or any similar utility to create a network tunnel to allow an attacker to covertly connect to an internal host.

Investigative actions

• Review the external IP/domain using known intelligence tools.
• Investigate the causality of the process and its user ID to find uncommon behaviors.
• Search for processes or files that were created by this SSH instance.