Uncommon VNC server communication

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
ATT&CK Tactic	Command and Control (TA0011), Lateral Movement (TA0008)
ATT&CK Technique	Remote Access Tools (T1219), Remote Services: VNC (T1021.005)
Severity	Low

Description

Uncommon VNC server network traffic was observed.

Attacker's Goals

• Accessing a remote machine with full interactive graphic interface capabilities.

Investigative actions

• Check if the product usage is approved.
• Check if it was executed remotely or locally.

Variations

Uncommon VNC scanning activity detected from a scanning tool

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011), Lateral Movement (TA0008)
ATT&CK Technique	Remote Access Tools (T1219), Remote Services: VNC (T1021.005)
Severity	Medium

Description

An uncommon VNC scanning network traffic was observed from a scanning tool.

Attacker's Goals

• Accessing a remote machine with full interactive graphic interface capabilities.

Investigative actions

• Check if the product usage is approved.
• Check if it was executed remotely or locally.

Uncommon VNC server communication from an unmanaged previously unseen external host

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011), Lateral Movement (TA0008)
ATT&CK Technique	Remote Access Tools (T1219), Remote Services: VNC (T1021.005)
Severity	Low

Description

Uncommon VNC server network traffic was observed from an unmanaged, previously unseen external host.

Attacker's Goals

• Accessing a remote machine with full interactive graphic interface capabilities.

Investigative actions

• Check the external client's IP address.
• Check if the product usage is approved.
• Check if it was executed remotely or locally.

Partially uncommon VNC server communication

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011), Lateral Movement (TA0008)
ATT&CK Technique	Remote Access Tools (T1219), Remote Services: VNC (T1021.005)
Severity	Informational

Description

Uncommon VNC server network traffic was observed.

Attacker's Goals

• Accessing a remote machine with full interactive graphic interface capabilities.

Investigative actions

• Check if the product usage is approved.
• Check if it was executed remotely or locally.

Uncommon VNC server connection

Synopsis

Field	Value
ATT&CK Tactic	Command and Control (TA0011), Lateral Movement (TA0008)
ATT&CK Technique	Remote Access Tools (T1219), Remote Services: VNC (T1021.005)
Severity	Informational

Description

An uncommon VNC Server network connection was observed.

Attacker's Goals

• Accessing a remote machine with full interactive graphic interface capabilities.

Investigative actions

• Check if the product usage is approved.
• Check if it was executed remotely or locally.