Downloader.gen.a!3AD4​0DA40222

This page shows details and results of our analysis on the malware Downloader.gen.a!3AD40DA40222

Overview

This is a Trojan detection. Unlike viruses, Trojans do not self-replicate. They are spread manually, often under the premise that they are beneficial or wanted. The most common installation methods involve system or security exploitation, and unsuspecting users manually executing unknown programs. Distribution channels include e-mail, malicious or hacked Web pages, Internet Relay Chat (IRC), peer-to-peer networks, etc.


Minimum Engine

5600.1067

File Length

288696

Description Added

2014-06-30

Description Modified

2014-06-30

Malware Proliferation

Characteristics

This is a Trojan

File PropertiesProperty Values
McAfee DetectionDownloader.gen.a
Length288696 bytes
MD53ad40da40222fafe5eab81ffc4703dc6
SHA14343005bdacda534f902d86812c8adb914bc2c24


Other Common Detection Aliases

Company NamesDetection Names
AVG (GriSoft)Skodna.Generic.AMG
aviraAPPL/Solimba.Gen
Kasperskynot-a-virus:Downloader.Win32.Solimba.b
Dr.WebAdware.Downware.1302
FortiNetAdware/Solimba
EsetMSIL/Solimba
risingPE:PUF.FirseriaInstaller@CV!1.5C42
SophosSolimba Installer
vba32TScope.Trojan.MSIL

Other brands and names may be claimed as the property of others.


ActivitiesRisk Levels
Attempts to launch an instance of Internet Explorer.Low
Enumerates many system files and directories.Low
Adds or modifies Internet Explorer cookiesLow


McAfee ScansScan Detections
McAfee BetaDownloader.gen.a
McAfee SupportedDownloader.gen.a



System Changes

Some path values have been replaced with environment variables as the exact location may vary with different configurations.
e.g.
%WINDIR% = \WINDOWS (Windows 9x/ME/XP/Vista/7), \WINNT (Windows NT/2000)
%PROGRAMFILES% = \Program Files


The following files were analyzed:

4343005BDACDA534F902D86812C8ADB914BC2C24

The following files have been added to the system:

  • %TEMP%\nsz23.tmp

The following files were temporarily written to disk then later removed:

  • %TEMP%\nsu22.tmp

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\FULLSCREEN = no
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\MAIN\WINDOW_PLACEMENT = [binary data]
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\INTERNET EXPLORER\TOOLBAR\LOCKED = 1

The applications attempted the following network connection(s):

  • hxxp://api.downloadmr.com/installer/8326f16e-dd66-11e2-a752-00259033c1da/9107993/*****
  • 200.236.31.*:80

Symptoms

This symptoms of this detection are the files, registry, and network communication referenced in the characteristics section.

Method of Infection

Trojans do not self-replicate. They are spread manually, often under the premise that the executable is something beneficial. Distribution channels include IRC, peer-to-peer networks, newsgroup postings, e-mail, etc.

Removal

Please use the following instructions for all supported versions of Windows:


1. Disable Windows System Restore. For instructions, please refer to: http://www.mcafee.com/us/downloads/free-tools/disabling-system-restore.aspx

2. Update your McAfee Anti-Virus product to the latest version (when possible), and ensure the latest DAT and Engine and any applicable EXTRA.DATs are installed.

3. Run a full system scan. (On-Demand Scan)

4. Reboot, as soon as it is convenient, to ensure all malicious components are removed.

Variants