Licat.C, a variant of Licat, is a Trojan. Licat.C can send instant messages or contact certain websites to inform malware authors about certain events and allows downloading files on the infected computer. Licat.C tries to connect to certain websites on Internet.
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
Licat.C arrives on the system as a downloaded file via a link that is spammed through MSN Messenger. Below is a sample message:
It searches for the location of MSN Messenger installed on the system through the following registry key:
When found, it attempts to rename the original MSN Messenger application client to msgs.exe. It then copies itself to the folder using the filename msnmsgr.exe so that it will start each time that MSN Messenger is started by the user. The copy then launches the renamed Messenger file.
Licat.C's backdoor component (some instances are detected as Backdoor.Win32.MSNMaker.v) connects to the following website:
This websites contains links to the following malicious IP address:
It uses a vulnerability in the meta tag, which has a malicious IP address on its content. Vulnerable web browsers will automatically execute the file when this site is accessed.
When this IP address is accessed, it will again download from the following websites and execute other malware on the system using the following filenames:
When this URL link is clicked, a copy of Licat.C will be downloaded on the system.
The two other downloaded files are a trojan dropper (Xinstall.exe) and an adware application (alfa.exe) respectively. They are now detected asTrojan-Dropper.Win32.PurityScan.ag and not-a-virus:AdWare.Win32.Softomate.q.
Date Created: Elda Dimakiling, September 25, 2006
Date Last Modified: Sean Sullivan, November 3, 2006