ZeroAccess.y!F323DBAF​719F

This page shows details and results of our analysis on the malware ZeroAccess.y!F323DBAF719F

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

90112

Description Added

2013-04-02

Description Modified

2013-04-02

Malware Proliferation

Characteristics

This is a Trojan

File PropertiesProperty Values
McAfee DetectionZeroAccess.y
Length90112 bytes
MD5f323dbaf719fdfbae43fbd0d0c68058d
SHA1ae7ae76025863a66cc8bb1bb647aecf289d955fb


Other Common Detection Aliases

Company NamesDetection Names
avastWin32:VB-ADPU
AVG (GriSoft)Worm/VB.14.DL
aviraTR/Dropper.Gen
KasperskyWorm.Win32.WBNA.naf
BitDefenderGen:Heur.VB.Agent.3
clamavWin.Trojan.Agent-19124
Dr.WebWin32.HLLW.Autoruner1.18501
F-ProtW32/Vobfus.AT.gen!Eldorado
FortiNetW32/VBObfus.AU!tr
MicrosoftWorm:Win32/Vobfus.FW
SymantecW32.Changeup
EsetWin32/AutoRun.VB.AXK worm
normanVobfus.AMHZ
pandaGeneric Worm
risingWorm.Win32.VobfusEx.b
SophosMal/VBObfus-B
Trend MicroWORM_VOBFUS.SMPI
vba32Worm.WBNA.naf
V-BusterTrojan.VBGent.Gen.1615 (trojan)
Vet (Computer Associates)Win32/Vobfus.ANP

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


ActivitiesRisk Levels
Modifies Windows explorer file browser's Advanced settings. Sometimes used by malware to make executable files look like documents.Medium
Enumerates many system files and directories.Low
Enumerates process listLow
No digital signature is presentInformational


McAfee ScansScan Detections
McAfee BetaZeroAccess.y
McAfee SupportedZeroAccess.y



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:

AE7AE76025863A66CC8BB1BB647AECF289D955FB

The following files have been added to the system:

  • %USERPROFILE%\cowoc.exe

The following registry elements have been created:

  • HKEY_LOCAL_MACHINE\SOFTWARE\POLICIES\MICROSOFT\WINDOWS\WINDOWSUPDATE\
  • HKEY_LOCAL_MACHINE\SOFTWARE\POLICIES\MICROSOFT\WINDOWS\WINDOWSUPDATE\AU\

The following registry elements have been changed:

  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\EXPLORER\ADVANCED\SHOWSUPERHIDDEN = 0
  • HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\WINDOWS\CURRENTVERSION\RUN\COWOC = %USERPROFILE%\cowoc.exe /o
  • HKEY_LOCAL_MACHINE\SOFTWARE\POLICIES\MICROSOFT\WINDOWS\WINDOWSUPDATE\AU\NOAUTOUPDATE = 1

The applications attempted the following network connection(s):

  • 255.255.255.***:8000
  • 60.173.12.**:8000

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

All Users:

Please use the following instructions for all supported versions of Windows to remove threats and other potential risks:

1.Disable System Restore .

2.Update to current engine and DAT files for detection and removal.

3.Run a complete system scan.

Modifications made to the system Registry and/or INI files for the purposes of hooking system startup, will be successfully removed if cleaning with the recommended engine and DAT combination (or higher).

1. Please go to the Microsoft Recovery Console and restore a clean MBR.

On windows XP:

Insert the Windows XP CD into the CD-ROM drive and restart the computer.
When the "Welcome to Setup" screen appears, press R to start the Recovery Console.
Select the Windows installation that is compromised and provide the administrator password
Issue 'fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.


On Windows Vista and 7:

Insert the Windows CD into the CD-ROM drive and restart the computer.
Click on "Repair Your Computer"
When the System Recovery Options dialog comes up, choose the Command Prompt.
Issue 'bootrec /fixmbr' command to restore the Master Boot Record
Follow onscreen instructions
Reset and remove the CD from CD-ROM drive.

Variants