Information about Trojan Dropper

"These types of programs are not "Trojan programs" themselves, but they are written by hackers, and are frequently used to deploy viruses, Trojan programs and backdoors to victim machines.

These "TrojanDroppers" are programs that silently (with no messages at all, or with some fake message) extract from themselves, drop to disk files and spawn one or more extra programs that are stored in (or attached to) the main "TrojanDropper" file.

Usually, the structure of such programs appears as follows:


----------¬
¦Main code¦
¦ ¦
+---------+
¦file1 ¦
+---------+
¦file2 ¦
+---------+

¦... ¦
L----------


The "Main code" extracts other components ("file1", "file2", ...), drops them to a disk (to disk C: root, to Windows or Windows system directory, to TEMP directory, etc.) and opens (spawns) these files.

Usually, one (or more) file(s) in there is/are Trojans or backdoors, and at least one file is a "decoy" component - a joke program, game, or some other kind of attractive program. This is done in order to deceive a user and disguise the Trojan/backdoor installation, using a decoy component.

As a result of using this type of "deploy packages," hackers achieve two goals:

a.. deceive a user and install a virus, Trojan, or backdoor silently, often hidden by a "decoy" program
b.. avoid detection by anti-virus scanners, most of which cannot scan inside such packages"

-Kapersky Lab


It looks like your hard drive may have been wanked by a malicious program spawned by the trojan dropper.