Detect date
11/25/2001
Class
Trojan-PSW
Platform
Win32

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-PSW

Trojan-PSW programs are designed to steal user account information such as logins and passwords from infected computers. PSW is an acronym of Password Stealing Ware. When launched, a PSW Trojan searches system files which store a range of confidential data or the registry. If such data is found, the Trojan sends it to its “master.” Email, FTP, the web (including data in a request), or other methods may be used to transit the stolen data. Some such Trojans also steal registration information for certain software programs.

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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

Technical Details

This program belongs to the family of password-stealing Trojans.

When activated, the Trojan installs itself to the system. While installing, the Trojan copies itself to the Windows or Windows system directory and registers itself in the system registry auto-run section. For example:

Trojan full name: WINDOWSSYSTEMkernel32.exe
Registry key:
HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRun
kernel32 = kernel32.exe

The installed Trojan file name, the target directory and registry key are optional. They are stored in encrypted form in the Trojan file at the file end. A hacker may configure them before sending the Trojan to a victim's machine, or before putting it on a Web site.

The Trojan then registers itself in the system as a hidden application (service), and the Trojan's process at this time is not visible in the task list. The Trojan also can drop an additional DLL library to intercept keyboard entries and to store these entries.

Being active in the system, the Trojan periodically sends e-mail messages to its host (hacker's e-mail address, which is also optional). The message contains the following: computer information (owner, Internet address, etc.), RAS information, cached passwords (login name and password) as well as text strings that are entered by a user during a Windows session.

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