July 23, 2001
The 4149 (or greater) DATs
(the full set and incrementals) include scanning of files with the .LNK extension mentioned below. VirusScan TC and VirusScan 4.51 (corporate) users can take advantage of this if they are using the default extension list. All other users, including corporate and retail, must update the extension list as noted below or SCAN ALL FILES.
July 22, 2001
For detection of W32/SirCam@MM, the LNK and PIF extensions need to be present on the extension list or SCAN ALL FILES must be chosen.
This mass-mailing virus attempts to send itself and local documents to all users found in the Windows Address Book and email addresses found in temporary Internet cached files (web browser cache).
It may be received in an email message containing the following information:
Hi! How are you?
I send you this file in order to have your advice
I hope you can help me with this file that I send
I hope you like the file that I sendo you
This is the file with the information that you ask for
See you later. Thanks
--- the same message may be received in Spanish ---
Hola como estas ?
Te mando este archivo para que me des tu punto de vista
Espero me puedas ayudar con el archivo que te mando
Espero te guste este archivo que te mando
Este es el archivo con la información que me pediste
Nos vemos pronto, gracias.
--- end message ---
Although other message body possibilities are present in the virus,
these aren't actually being generated frequently.
Attached will be a document with a double extension (the filename varies). The first extension will be the file type which was prepended by the virus. When run, the document will be saved to the C:\RECYCLED folder and then opened while the virus copies itself to C:\RECYCLED\SirC32.exe folder to conceal its presence and create the following registry key value to load itself whenever .EXE files are executed:
\Default="C:\recycled\SirC32.exe" "%1" %*
As the RECYCLE BIN is often on the exclusion list, check your settings to insure that this directory IS being scanned.
It also copies itself to the WINDOWS SYSTEM directory as SCam32.exe and creates the following registry key value to load itself automatically:
A list of .GIF, .JPG, .JPEG, .MPEG, .MOV, .MPG, .PDF, .PNG, .PS, and .ZIP files in the MY DOCUMENTS folder is saved to the file SCD.DLL (the 2nd character of the name appears to be random) in the SYSTEM directory. Email addresses are gathered from the Windows Address Book and temporary Internet cached pages and saved to the file SCD1.DLL (the 2nd and 3rd character of the name appears to be random) in the SYSTEM directory.
The worm prepends a copy of the files that are named in the SCD.DLL file and attaches this copy to the email messages that it sends via a built in for communicating directly with a SMTP server, using one of the following extensions: .BAT, .COM, .EXE, .LNK, .PIF. This results in attachment names having double-extensions.
The program creates a registry key to store variables for itself (such as a run count, and SMTP information):
The virus may also infect other systems by using open network shares
. On remote systems the file \windows\rundll32.exe may get replaced with a viral copy, while the valid RUNDLL32.EXE file is renamed to RUN32.EXE. On those systems, the AUTOEXEC.BAT file may be appended with the line: @win \recycled\sirc32.exe.
Aside from e-mail overloading, it may delete files and/or fill up harddisk space by adding text entries over & over again to a sircam recycle bin file.
||This detection covers corrupt, SirCam infected, files.