Self-Signed SSL Certificates Used in Malware Command-and-Control Networks
IntelliShield: Security Activity Bulletin
2013 March 01 21:09 GMT
2013 March 01 21:09 GMT
Self-signed SSL certificates could allow attackers conducting Advanced Persistent Threat campaigns to obscure malicious command-and-control infrastructure network communications.
Self-signed SSL certificates could allow attackers conducting Advanced Persistent Threat (APT) campaigns to obscure malicious command-and-control (C2) infrastructure network communications.
Reports indicate that ongoing APT campaigns may use self-signed SSL certificates to encrypt network communications between C2 servers. The attackers could use crafted self-signed SSL certificates that use the names of legitimate businesses or individuals in an effort to obscure the nature of the malicious traffic.
Administrators are advised to implement an intrusion prevention system (IPS) or intrusion detection system (IDS) to help detect and prevent attacks that attempt to exploit this vulnerability.
Reports indicate that Advanced Persistent Threat (APT) attackers have been observed to use self-signed SSL certificates in the wild. Detection or identification of self-signed SSL certificates may be an indicator of malicious activity.
The security vulnerability applies to the following combinations of products.
Security Activity Bulletin
Alerts and bulletins on the Cisco Security Intelligence Operations Portal are highlighted by analysts in the
Cisco Threat Operations Center and represent a subset of the comprehensive content that is available through Cisco Security IntelliShield Alert Manager Service.
This customizable threat and vulnerability alert service provides security staff with access to timely, accurate, and credible information about threats and vulnerabilities that may affect their environment.
The urgency and severity ratings of this alert are not tailored to individual users; users may value alerts differently based upon their network configurations and circumstances. THE ALERT, AND INFORMATION CONTAINED THEREIN, ARE PROVIDED ON AN "AS IS" BASIS AND DO NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE. YOUR USE OF THE ALERT, AND INFORMATION CONTAINED THEREIN, OR MATERIALS LINKED FROM THE ALERT, IS AT YOUR OWN RISK. INFORMATION IN THIS ALERT AND ANY RELATED COMMUNICATIONS IS BASED ON OUR KNOWLEDGE AT THE TIME OF PUBLICATION AND IS SUBJECT TO CHANGE WITHOUT NOTICE. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE ALERTS AT ANY TIME.