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HomeTopics 4Network SecurityNTLM Vulnerability Targeted: TA577 Explores Backdoor for Malicious Activity

NTLM Vulnerability Targeted: TA577 Explores Backdoor for Malicious Activity


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Cybersecurity researchers have identified a concerning tactic employed by the cybercriminal group TA577, highlighting a potential vulnerability within the NTLM (NT LAN Manager) authentication protocol.

This article delves into the details of the attack, explores the associated risks, and provides crucial recommendations for organizations to mitigate such threats and protect their systems.

Understanding NTLM and its Vulnerabilities:

NTLM, an older authentication protocol often used in legacy systems and Windows environments, has known security weaknesses. One such vulnerability involves the transmission of user credentials in a non-encrypted format, making them susceptible to interception by attackers. This vulnerability is what TA577 is reportedly exploiting.

TA577’s Malicious Exploit:

TA577’s attack strategy involves:

  • Distributing malicious files: These files, typically disguised as legitimate software or documents, are distributed through phishing emails or other social engineering tactics.
  • Exploiting NTLM vulnerability: Once the file is executed, it exploits the NTLM vulnerability to steal user credentials, including usernames and passwords.
  • Lateral movement and data exfiltration: Using the stolen credentials, attackers can gain access to other systems within the network, potentially exfiltrating sensitive data or installing additional malware.

This attack method raises concerns, as it allows unauthorized access to internal systems and potentially grants attackers a foothold within the network, enabling further malicious activity.

10 Best Practices to Mitigate NTLM-based Threats:

  1. Disable NTLM: Wherever possible, organizations are strongly advised to disable NTLM authentication and migrate to more secure alternatives like Kerberos or Modern Authentication.
  2. Enforce strong password policies: Implement robust password policies requiring complex, unique passwords and enforce regular password changes.
  3. Multi-factor authentication (MFA): Enable MFA for all user accounts, adding an extra layer of security beyond passwords.
  4. Educate employees: Train employees on identifying phishing attempts and suspicious emails to prevent accidental compromise of credentials.
  5. Patch and update systems promptly: Regularly apply security patches and software updates to address known vulnerabilities in operating systems and applications.
  6. Segment networks: Implement network segmentation to limit lateral movement within the network if a breach occurs.
  7. Monitor network activity: Continuously monitor network activity for unusual or suspicious behavior that might indicate an ongoing attack.
  8. Implement endpoint detection and response (EDR) solutions: Utilize EDR solutions to detect and respond to malicious activity on endpoints within the network.
  9. Maintain robust backups: Regularly back up critical data and maintain a comprehensive disaster recovery plan to facilitate swift restoration in case of a cyberattack.
  10. Stay informed about evolving threats: Regularly update your knowledge about evolving cybersecurity threats and best practices through reputable sources.


The TA577 attack on NTLM vulnerabilities underscores the importance of prioritizing strong authentication protocols and implementing robust cybersecurity measures. By adopting the recommended best practices, organizations can significantly reduce their attack surface and protect their systems from malicious actors like TA577. Remember, a proactive approach to cybersecurity is essential in safeguarding your organization’s data and maintaining a secure digital environment.

Ouaissou DEMBELE
Ouaissou DEMBELEhttps://cybercory.com
Ouaissou DEMBELE is an accomplished cybersecurity professional and the Editor-In-Chief of cybercory.com. He has over 10 years of experience in the field, with a particular focus on Ethical Hacking, Data Security & GRC. Currently, Ouaissou serves as the Co-founder & Chief Information Security Officer (CISO) at Saintynet, a leading provider of IT solutions and services. In this role, he is responsible for managing the company's cybersecurity strategy, ensuring compliance with relevant regulations, and identifying and mitigating potential threats, as well as helping the company customers for better & long term cybersecurity strategy. Prior to his work at Saintynet, Ouaissou held various positions in the IT industry, including as a consultant. He has also served as a speaker and trainer at industry conferences and events, sharing his expertise and insights with fellow professionals. Ouaissou holds a number of certifications in cybersecurity, including the Cisco Certified Network Professional - Security (CCNP Security) and the Certified Ethical Hacker (CEH), ITIL. With his wealth of experience and knowledge, Ouaissou is a valuable member of the cybercory team and a trusted advisor to clients seeking to enhance their cybersecurity posture.


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