F-Secure Virus Descriptions : Gop (trojan)
Gop belongs to a family of passwords stealing trojans. This
trojan seems to be written in China. The trojan is designed to
steal OICQ (Chinese clone of ICQ?) passwords.
When run the trojan installs itself to the system. While
installing the trojan copies itself to Windows, Windows system or
TEMP directory and registers itself in system registry auto-run
section. For example:
Trojan's full name:
WINDOWS\SYSTEM\winzipauto.exe
Registry key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
WindowsAgent = winzipauto.exe
The installed trojan file name, the target directory are
optional. They are stored in encrypted form in trojan file at the
file end. To steal OICQ data the trojan also drops additional DLL
file (hooker) with optional name. A hacker may configure optional
data before sending trojan to a victim machine, or before put it
on a web site.
There other optional features of this trojan:
display decoy (fake) messsage, and the message text
delete original file after installing into the system
email address to there stolen data is being sent (default - goicq@sina.com)
smtp server to there the data is being sent (default - smtp.sina.com.cn)
The trojan then registers itself in the system as hidden
aplication (service), the trojan process then is not visible in
task list. Being active in the system trojan periodically sends
email messages to its host (hacker's email address).
There are known "upgrated" version of this trojan that do mail
themselves, and are "Internet worms" as a result. See the
description of Gop worm.
[Analysis: Kaspersky Labs; January 2002]
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