Generic.dx!5F4C4C8C

This page shows details and results of our analysis on the malware Generic.dx!5F4C4C8C

Download Current DAT: 6617

Threat Detail

Malware Type: Trojan

Malware Sub-type: N/A

Discovery Date: 2008-09-08

Next Steps:

Overview
Characteristics
Symptoms
Method of Infection
Removal

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 DAT

5378 (2008-09-05)

Updated DAT

5378 (2008-09-05)

Minimum Engine

5.3.00

File Length

240128

Description Added

2008-09-08

Description Modified

2008-09-08

Malware Proliferation

Characteristics

File Property	Property Value
FileName	ren.exe
McAfee Detection	Generic.dx
Length	240,128 bytes
CRC	5F4C4C8C
MD5	C796482CCFE04D1F9A49B7F9A0FA6373
SHA1	5C092F0FAFF9BC744FE9F61358BCF650C4DEA019

Other Common Detection Aliases

Company Name	Detection Name
ahnlab	Win-Trojan/Hider.234496
avast	Win32:Trojan-gen {Other}
AVG (GriSoft)	Generic8.GHY
Avira	TR/Hider.I
BitDefender	Trojan.Hider.I
Dr.Web	Trojan.Hidn
Eset	Win32/Hider.I
F-Prot	W32/Backdoor.BVFG
Kaspersky	Trojan.Win32.Hider.i
microsoft	trojan:win32/hider
norman	w32/malware.ptu
panda	Trj/Agent.ECB
rising	Trojan.Hider.ve
Sophos	Troj/Hider-O
Symantec	W32.SillyFDC
Trend Micro	TROJ_HIDER.I
vba32	Trojan.Win32.Hider.i
V-Buster	Trojan.Hider.G
Vet (Computer Associates)	Win32/HideIt.A

Avert® Labs has observed the following system activities:

Activity	Risk Level
Writes executable in the windows folder	Low
Performs a shell execute of downloaded or existing files	Informational

Other detections that have been observed.

FileName	McAfee Supported
%WINDIR%\system32\isass.exe	Generic.dx

System Changes

These are general defaults for typical path variables. (Although they may differ, these examples are common.):
%WinDir% = \WINDOWS (Windows 9x/ME/XP/Vista), \WINNT (Windows NT/2000)
%SystemDir% = \WINDOWS\SYSTEM (Windows 98/ME), \WINDOWS\SYSTEM32 (Windows XP/Vista), \WINNT\SYSTEM32 (Windows NT/2000)
%ProgramFiles% = \Program Files

The following files have been added to the system:

%WINDIR%\system32\exe2.tmp

%WINDIR%\system32\exe3.tmp

%WINDIR%\system32\isass.exe

The following registry elements have been changed:

hkey_local_machine\software\classes\exefile\

(default) = file folder

hkey_local_machine\software\microsoft\windows\currentversion\explorer\advanced\folder\hidefileext\

uncheckedvalue = 1

hkey_local_machine\software\microsoft\windows\currentversion\explorer\advanced\folder\superhidden\

uncheckedvalue = 0

hkey_local_machine\system\controlset001\control\servicecurrent\

(default) = 9

hkey_local_machine\system\currentcontrolset\enum\root\legacy_csnetmanagerxp\0000\control\

activeservice = csnetmanagerxp

hkey_users\s-1-5-21-1202660629-602609370-839522115-500\software\microsoft\windows\currentversion\explorer\advanced\

hidefileext = 1
showsuperhidden = 0

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.