Trojan-Dropper.Win32.Small

Parent class: TrojWare

Trojans are malicious programs that perform actions which are not authorized by the user: they delete, block, modify or copy data, and they disrupt the performance of computers or computer networks. Unlike viruses and worms, the threats that fall into this category are unable to make copies of themselves or self-replicate. Trojans are classified according to the type of action they perform on an infected computer.

Class: Trojan-Dropper

Trojan-Dropper programs are designed to secretly install malicious programs built into their code to victim computers. This type of malicious program usually save a range of files to the victim’s drive (usually to the Windows directory, the Windows system directory, temporary directory etc.), and launches them without any notification (or with fake notification of an archive error, an outdated operating system version, etc.). Such programs are used by hackers to: secretly install Trojan programs and/or viruses protect known malicious programs from being detected by antivirus solutions; not all antivirus programs are capable of scanning all the components inside this type of Trojans.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

When launching, the Trojan copies itself to the Windows temporary directory and launches its executable file:

%Temp%~__UNINST.EXE

It then extracts the following files from its body to the Windows temporary directory:

• %Temp%d2maphack.exe
• %Temp%Patch.exe — this file is 494,592 bytes in size, and will be detected by Kaspersky Anti-Virus as Backdoor.Win32.Netbus.170

The Trojan then launches these files for execution.

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