ENSRT Incident Note ETS-i-2005-12595
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.Looked.F
Release Date: 09/20/2005
Last Updated:
Overview
The W32.Looked.F worm spreads through network shares and attempts to infect .exe files. In addition, W32.Looked.F lowers security settings and attempts to download and execute a remote file.
Details below describe the characteristics of the W32.Looked.F worm 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
Once the W32.Looked.F worm infects a network, it spreads to end-user PCs and performs the following actions:
1. Creates new a new file named Logo1_.exe in the Windows directory.
2. Closes properties associated with security related products.
3. Changes specific registry entries.
4. Searches for the file PasswordGuard.exe and if its name begins with a numeric character, the worm ends any processes relating to these files.
5. Tries to download and execute a file from a remote web site.
6. Searches all network drives for .exe and prepends itself file to those executables.
7. Sends ICMP packets containing the string "Hello,World" to IP addresses in the same range as the IP address of the compromised computer, as well as 192.168.0.30 and 192.168.8.1.
8. If any computer responds to the ICMP packet, the worm attempts to open a shared folder named \\ipc$ or "\\admin$"
Threat Assessment
Trojans, Worms 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 N-Series | 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 the W32.Looked.F worm can be retrieved via Dragon Live Update and is located in the Master Library within the ENSRT category. The "ENSRT:W32-LOOKED-F-001" signature can be copied into a custom library and deployed on internal Dragon network sensors to successfully detect end-user class machines which have become infected with the worm.
Prevention
Trusted End System solutions are capable of monitoring various end system activity. TES is able to take immediate action such as firewalling specific IPs, TCP/UDP ports, applications, or placing the user into a Quarantine policy or VLAN until end system threat is mitigated. Learn more at: http://www.enterasys.com/solutions/secure-networks/trusted_end_system/
Containment
The Enterasys Dynamic Intrusion Response (DIR) solution can be utilized to 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.
Repair
Monitor Dragon RealTime Console for alerts that end-user PCs have become infected with the virus. If utilizing the DIR solution, users can either be expunged from the network or provided with a quarantine Policy. Once isolated, see your anti-virus vendor for Windows repair procedures for infected users.
References
http://securityresponse.symantec.com/avcenter/venc/data/w32.looked.f.html
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Revision History:
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Version: 1.0 |
Date: 09/20/2005 |
Author: ENSRT STAFF |
Change |