ENSRT Incident Note ETS-i-2006-12601
The Enterasys Security Response Team (ENSRT) publishes incident notes to provide information for our constituents to raise awareness of issues deemed threatening to the security and integrity of our customers.
Worm - W32.Blackmal.E@mm
Release Date: 01/24/2006
Last Updated: 01/25/2006
Overview
Worm W32.Blackmal.E@mm spreads via a mass-mailing component which utilizes an embedded SMTP engine. Additionally, Blackmal.E attempts to spread through the transfer of itself to Microsoft Windows network shares with weak passwords.
Details below describe the characteristics of W32.Blackmal.E@mm as well as provide detection, containment, and prevention techniques available through Enterasys Secure Networks solutions.
Systems affected
Windows operating systemsSystems not affected
Linux and MAC/OSXDescription
For a full analysis of the W32.Blackmal.E@mm mass-mailing worm utilize the reference section of this security advisory.
Threat Assessment
Mass-mailing worms if not addressed through prudent remediation steps may congest mail servers and/or degrade network performance. Mass-mailing worms may impact individual system performance and compromise security settings allowing unauthorized remote access to the compromised host.
Trojans or backdoor listeners if not addressed through prudent remediation steps, can compromise network and host security. Additionally, trojans and backdoor listeners potentially allow theft of information, unauthorized remote access, and damage to critical files.
Remediation
| Matrix N7 | X |
| Matrix E7 | X |
| Matrix E6 | X |
| Matrix E5 | X |
| Matrix E1 | X |
| VH | X |
| C-Series | X | B-Series | X |
Detection
A specific Dragon signature to detect worm W32.Blackmal.E@mm can be retrieved via Dragon Live Update and is located in the Master Library within the ENSRT category. The signature "ENSRT:W32-BLACKMAL-E-001" can be copied into a custom library and deployed on Dragon network sensors to successfully detect end-user class machines which have become infected with the worm.
Additionally, Dragon Intrusion Defense 7.2 installations can deploy signatures "DC:2002789" and "DC:2002788" to detect the W32.Blackmal.E@mm worm.
Prevention
Enterasys offers two forms of prevention:
1) The Enterasys Sentinel ™ solution is capable of monitoring various end system activities. Enterasys Sentinel ™ is able to take immediate action such as traffic filtering for IP addresses and TCP/UDP ports or placing the user into a Quarantine policy or VLAN until end system threat is mitigated.
2) In-line attack disruption can be achieved via the Dragon Intrusion Prevention System (IPS) to drop detected events before vulnerabilities can be exploited.
Containment
The Enterasys Secure Networks ™ solution can remove infected end-users from the enterprise network by detecting the infection with a Dragon NIDS signature (see "Detection" section of this report), locating the user's connection point using Automated Security Manager's location services module, and either placing the user in a quarantine VLAN or disabling the associated switch port for the user.
Using Enterasys Policy Manager, enforce a policy that allows SMTP traffic from end user PCs to authorized SMTP mail servers and blocks SMTP traffic to unauthorized end users or unknown Internet systems. If the SMTP protocol is not implemented for end users within the enterprise, consider implementing a policy blocking SMTP traffic from end user ports.
Repair
Monitor Dragon Realtime Console for alerts that end-user PCs have become infected with the virus. If utilizing Enterasys Secure Networks ™ architecture to detect and locate network threats, users can either be expunged from the network or quarantined. Once isolated, see your anti-virus vendor for Windows repair procedures for infected users.
References
http://securityresponse.symantec.com/avcenter/venc/data/w32.blackmal.e@mm.html
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Revision History:
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Version: 1.0 |
Date: 01/24/2006 |
Author: ENSRT STAFF |
Change |