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Microsoft Security Intelligence
Published Dec 12, 2021 | Updated Dec 20, 2021


Detected by Microsoft Defender Antivirus

Aliases: No associated aliases


Microsoft Defender Antivirus detects and removes this threat.

This threat exploits the remote code execution vulnerability, CVE-2021-44228 (also referred to as “Log4Shell”), in the Log4j component of Apache. This vulnerability affects Java-based applications that use Log4j 2 versions 2.0 through 2.14.1.

Attackers gain access to the target device and launch arbitrary remote code loaded from LDAP servers, which are logged and launched by the Log4j component.

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Microsoft Defender Antivirus  automatically removes threats as they are detected. If you have cloud-delivered protection, your device gets the latest defenses against new and unknown threats. If you don't have this feature enabled, update your antimalware definitions and run a full scan to remove this threat. You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

  • Confirm that this server has Apache and the Log4j component installed.
  • Check for possible post-exploitation activities, such as unusual behavior from users with elevated privileges or suspicious spawned processes. 
  • Stop suspicious processes, isolate affected devices, decommission compromised accounts or reset passwords, block IP addresses and URLs, and install security updates. Update the Log4j component to log4j-2.17.0 or ensure that the device is set to start with log4j2.formatMsgNoLookups set to True.
  • Contact your incident response team, or contact Microsoft support for investigation and remediation services

You can also visit our advanced troubleshooting page or search the Microsoft virus and malware community for more help.

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