General discussion

Zafi.B worm can terminate antivirus programs


For release June 14, 2004

Zafi.B worm can terminate antivirus programs

The new variant spreads fast in several different languages

F-Secure is warning the computer users of a new variant of Zafi email worm -
Zafi.B - that was found in the wild on Friday, June 11th. Due to the worm's
spreading speed, it was raised to Radar level 2 alert on Sunday, May 13th.
The worm spreads by email in variable PIF.-, .EXE-, or COM -attachments. It
also sends the messages in several different languages; e.g. in English,
Italian, Spanish, Russian, Swedish, German or Finnish.

Like a typical email worm, Zafi.B also gathers addresses from the users
address books and then spreads by sending itself to those addresses. When the
worm activates, it copies itself to the Windows System Directory with a
random .DLL and random .EXE name. After this the worm scans through all
directories in the system and replicates as either 'winamp 7.0
full_install.exe' or 'Total Commander 7.0 full_install.exe' to all folders
that contain 'share' or 'upload' in their name. In addition to this, it
terminates all applications that have 'firewall' or 'virus' in their

"This worm is tricky, as it has a feature that can close down firewalls and
antivirus programs in order to help itself spread further", Mikael Albrecht,
the product Manager at F-Secure explains. "But that's not all. Another
interesting thing about this worm is that the infected messages come in many
different languages. As most of the widely spread worms use only English,
this feature may confuse the user to open the message - and the worm spreads
on", he continues.

Examples of the messages in other languages as well as more detailed
technical description of the Zafi.B worm are available in the F-Secure Virus
Description Database at

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