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The Exchange built-in malware agent must be disabled.


Finding ID Version Rule ID IA Controls Severity
V-259696 EX19-MB-000151 SV-259696r942402_rule Medium
Malicious code protection mechanisms include but are not limited to antivirus and malware detection software. To minimize potential negative impact to the organization that can be caused by malicious code, it is imperative that malicious code is identified and eradicated. Malicious code includes viruses, worms, trojan horses, and spyware. It is not enough to have the software installed; this software must periodically scan the system to search for malware on an organization-defined frequency. Exchange's built-in Malware Agent is not designed to address all malicious code protection workloads. This workload is best handled by third-party antivirus and intrusion prevention software. Sites must use an approved DOD scanner. Exchange Malware software has a limited scanning capability and does not scan files that are downloaded, opened, or executed.
Microsoft Exchange 2019 Mailbox Server Security Technical Implementation Guide 2024-01-10


Check Text ( C-63435r942400_chk )
Open the Exchange Management Shell and enter the following command:

Get-TransportAgent "Malware Agent"

If the value of "Enabled" is set to "True", this is a finding.
Fix Text (F-63343r942401_fix)
Open the Exchange Management Shell and enter the following command:

& env:ExchangeInstallPath\Scripts\Disable-Antimalwarescanning.ps1