This description is for a file infecting virus which searches for executable files on the infected machine to prepend its viral code.
Apart from this, it also drops other malware, which inturn download password stealing trojans from various websites.
The characteristics of this virus with regards to file names/folders created will differ depending on the way in which the attacker had configured it. Hence, this is a general description.
5024 (2007-05-04)Updated DAT
When executed, this virus drops the following files:
It then creates the following registry entries:
The dropped dll file named RichDll.dll then injects itself into Explorer.exe and IExplore.exe and attempts to download other file from the following location:
This site hosts password stealing Trojans, typically from PWS-Lineage and PWS-WOW family.
The virus, then searches for executable files and prepends its viral code to target files.
The virus creates files with the name "_desktop.ini" in every folder where an infection takes place. This is created as a hidden system file and contains the date on which virus was executed to visit the folder in which the file resides. The date is shown in yyyy/mm/dd format.
The virus tries to spread via existing network shares. It searches for all active machines within the subnet. When it finds an active machine it sends an ICMP ping request and waits for a response. After getting the ping response it tries to access the ADMIN$, IPC$ and any other shares that might exist on the machine.
If the virus is able to access a shared resource, it first copies "_desktop.ini" to the root of the share to mark the share as visited and then infects executables present in the share.
While infecting executables via a network share the virus does not limit itself to infecting specific file names as mentioned above. In the case of a shared printer, the virus's infection routine effectively creates printer job to print the date as contained in "_desktop.ini" file that the virus tries to copy.
This is a file infecting virus, and infection starts with manual execution of the binary. It may rely on improperly configured shares to spread.
This virus may also be received as a result of poor security practices, or un-patched machines and vulnerable systems. Distribution channels include IRC, peer-to-peer networks, email, newsgroups postings, etc.
A combination of the latest DATs and the Engine will be able to detect and remove this threat. AVERT recommends users not to trust seemingly familiar or safe file icons, particularly when received via P2P clients, IRC, email or other media where users can share files.