Win32/TrojanDownloader.Zurgop [Threat Name] go to Threat

Win32/TrojanDownloader.Zurgop.BI [Threat Variant Name]

Category trojan
Size 65142 B
Aliases Trojan.Win32.Sharik.rfw (Kaspersky)
  TrojanDownloader:Win32/Dofoil.W (Microsoft)
Short description

Win32/TrojanDownloader.Zurgop.BI is a trojan which tries to download other malware from the Internet.

Installation

When executed, the trojan copies itself into the following location:

  • %appdata%\­%variable2%\­%variable1%.exe

In order to be executed on every system start, the trojan sets the following Registry entries:

  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Run]
    • "%variable3%" = "%appdata%\­%variable2%\­%variable1%.exe"
  • [HKEY_CURRENT_USER\­Software\­Microsoft\­Windows\­CurrentVersion\­Policies\­Explorer\­Run]
    • "%variable3%" = "%appdata%\­%variable2%\­%variable1%.exe"

A string with variable content is used instead of %variable1-3% .


The trojan may create the following files:

  • %startup%\­%variable2%.lnk

The file is a shortcut to a malicious file.


This causes the trojan to be executed on every system start.


The trojan terminates its execution if it detects that it's running in a specific virtual environment.


The trojan quits immediately if the executable file path contains one of the following strings:

  • sample

The trojan quits immediately if any of the following applications is detected:

  • Sandboxie

The trojan quits immediately if it is run within a debugger.


The trojan creates and runs a new thread with its own program code within the following processes:

  • explorer.exe
  • svchost.exe

After the installation is complete, the trojan deletes the original executable file.

Other information

The trojan acquires data and commands from a remote computer or the Internet.


The trojan contains a list of (2) URLs. The HTTP protocol is used.


It can execute the following operations:

  • update itself to a newer version
  • uninstall itself
  • download files from a remote computer and/or the Internet
  • run executable files
  • collect information about the operating system used
  • send gathered information

The trojan checks for Internet connectivity by trying to connect to the following servers:

  • http://www.msn.com

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