Being run the trojan creates some Registry entries including the
one which will enable it to run during all next Windows sessions.
Unlike other password stealing trojans the PSW.Boobs doesn't copy
itself to \Windows\ or \Windows\System\ directory and is always
started from the same location it was run first time.
After activation the trojan displays a dialog with a picture of a
nude girl and a message 'Click Here'. When the picture is clicked
the trojan animates it. At the same time the trojan scans all
directory tree of the first hard drive and creates a log file
WSTMP.$$$ where locations of all DOC files are listed. The trojan
uses this file as a 'flag' and doesn't show its dialog box again
during further activations if this file already exists. The
trojan also creates an empty TMP.$$$ file in root directory of
After reboot the trojan gets control and looks for a valid
Internet connection. When it is acquired the trojan sends all DOC
files listed in WSTMP.$$$ to an e-mail address in South Africa
<firstname.lastname@example.org>. The subject line of the message is 'NBS As
Requested'. The trojan doesn't use any e-mail browser to send out
messages, so data leak might be difficult to discover.
To remove the trojan from computer it's sufficient to delete its
executable in DOS as the file is blocked by Windows when the
trojan is active.
F-Secure provides detection and removal of this trojan with
the latest AVC updates that can be downloaded from our ftp site:
[Analysis: Alexey Podrezov, F-Secure]