This is a virus-worm that spreads via the Internet attached to infected
e-mail. The worm itself is a Windows PE EXE file about 30Kb in length
(compressed by UPX, 76K decompressed), and it is written in Microsoft Visual C++.
Infected messages appear as follows:
The worm activates from infected e-mail only when a user double-clicks on the attached
file. The worm then installs itself to the system and runs a spreading routine.
While installing, the worm copies itself to:
c:regctrl.exe – under Win9x/ME
c:recycledregctrl.exe – under WinNT/2K/XP
and spawns this copy. When the worm’s file name is not “.com” (as in the attachment),
but rather “.exe” (the worm is re-named), it also opens the Web page
The original file (as it was run from an infected e-mail) is moved to the Recylced or
Recycler directory with one of the following names:
where %1, %2, %3 are randomly selected numbers, for example:
While installing, the worm checks the keyboard layouot set, and when there
is Russian keyboard support, the worm copies itself to Recycled/Recycler in the
same way and exits. This is the same on any date except for 25-29 January 2002.
As a result, the worm works only from 25 until 29 January 2002, and only on machines
without Russian keyboard support.
To send infected messages, the worm uses a direct SMTP connection to an e-mail
server. To obtain a victim’s e-mail addresses, the worm scans WAB files (Windows
Address Book) and *.DBX files (Outlook Express).
The worm also sends one e-mail (without an attachment) to “firstname.lastname@example.org”.
Under WinNT/2000/… the worm also creates a new file in a user’s auto-run directory:
and writes a backdoor program to there. This backdoor is run by data
that are stored in a file at the Web site “http://188.8.131.52”.
This one is a slightly modified ‘a’ version. The differences are: