CISA updates Exchange Server guidance with two web shells.

News: CISA Adds Two Web Shells to Exchange Server Guidance On August 2, 2021, the Cybersecurity and Infrastructure Security Agency (CISA) issued a new warning regarding vulnerabilities in Microsoft Exchange servers. CISA has identified two new web shells that are being used by threat actors to compromise Exchange servers. These web shells, named China Chopper and Mimikatz, allow attackers to maintain persistence, exfiltrate data, and execute commands on compromised systems. According to CISA, these web shells were not previously included in their guidelines for securing Exchange servers. As such, organizations that have not implemented the recommended mitigations are advised to take immediate action to protect their systems. CISA has provided updated guidance on detecting and mitigating these web shells, along with indicators of compromise (IOCs) that can help organizations identify if their systems have been compromised. In response to this threat, CISA has urged organizations to: 1. Implement the latest security updates and patches for Microsoft Exchange servers. 2. Conduct thorough security assessments to identify any signs of compromise. 3. Monitor network traffic for suspicious activity and unauthorized access. 4. Use multi-factor authentication and strong password policies to secure systems. 5. Work closely with CISA and other cybersecurity agencies to share information and collaborate on threat intelligence. The addition of these two web shells to CISAs guidance underscores the evolving nature of cyber threats and the importance of staying vigilant in protecting critical infrastructure. By following the recommended best practices and staying informed about emerging threats, organizations can reduce their risk of falling victim to cyber attacks. People Also ask: ### What is the significance of the China Chopper web shell?

The China Chopper web shell is a small yet powerful tool used by threat actors to compromise web servers and maintain persistent access. Named for its small size and origins in China, this web shell allows attackers to execute commands, exfiltrate data, and conduct reconnaissance on compromised systems. Organizations should be aware of the threat posed by the China Chopper web shell and take steps to detect and mitigate its presence.

### How does the Mimikatz web shell work?

The Mimikatz web shell is a versatile tool that allows threat actors to gather credentials from compromised systems, which can then be used to escalate privileges and move laterally within a network. This web shell is capable of extracting passwords, hashes, and other sensitive information from memory, making it a potent tool for attackers. Organizations should be alert to signs of Mimikatz activity on their systems and take immediate steps to remove it.

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CISA updates Exchange Server guidance with two web shells.