Rare MS-Update Server was detected

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	2 Days
Required Data	Palo Alto Networks Firewall EAL Logs
ATT&CK Tactic	Initial Access (TA0001)
ATT&CK Technique	Trusted Relationship (T1199)
Severity	Informational

Description

The endpoint requested an MS-Update operation from a rare update server.

Attacker's Goals

• The Windows Server Update Services enable machines to discover and download software updates from a dedicated update server.
• Attackers may use the MS-Update protocol to execute unauthorized code through Microsoft binaries.

Investigative actions

• Inspect the legitimacy of the server as a WSUS functioning server.
• Verify that your MS-Update network routine is HTTPS enforced* Verify that this MS-Update server is not a newly deployed server as part of a legitimate IT activity.

Variations

Rare MS-Update Server was detected

Synopsis

Field	Value
ATT&CK Tactic	Initial Access (TA0001)
ATT&CK Technique	Trusted Relationship (T1199)
Severity	Informational

Description

The endpoint requested an MS-Update operation from a rare update server.

Attacker's Goals

• The Windows Server Update Services enable machines to discover and download software updates from a dedicated update server.
• Attackers may use the MS-Update protocol to execute unauthorized code through Microsoft binaries.

Investigative actions

• Inspect the legitimacy of the server as a WSUS functioning server.
• Verify that your MS-Update network routine is HTTPS enforced* Verify that this MS-Update server is not a newly deployed server as part of a legitimate IT activity.