Generic BackDoor!68a521cd1d46

This page shows details and results of our analysis on the malware Generic BackDoor!68a521cd1d46

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

949984

Description Added

2009-08-11

Description Modified

2009-08-11

Malware Proliferation

Characteristics

File PropertyProperty Value
FileNameUnavailable
McAfee ArtemisArtemis!68a521cd1d46
McAfee DetectionGeneric BackDoor
Length949,984 bytes
CRC10AD8E9E
MD568A521CD1D46AE3B99D18F4C4DABE1B5
SHA17939051D772A1F92B12632F0A1D8BDB8D770EC93

Other Common Detection Aliases

Company NameDetection Name
ahnlabWin-Trojan/Agent.949984
avastVBS:Malware-gen
AVG (GriSoft)backdoor.generic_c.cfi
AviraDR/PSW.Zapchast.zwrc.67
BitDefenderBackdoor.Zapchast.PF
clamavTrojan.IRC.Zapchast-16
Dr.WebProgram.mIRC.603
EMSI SoftwareBackdoor.IRC.Zapchast!IK
EsetREG/RunKeys.NAA
F-Prot~W32/Heuristic-300!Eldorado
KasperskyBackdoor.IRC.Zapchast.zwrc
microsoftBackdoor:Win32/IRCFlood
pandaBAT/Autorun.TA
risingTrojan.Win32.ZBot.bi
SophosMal/Zapchas-C
SymantecTrojan.Dropper
Trend MicroREG_ZAPCHAST.ED
vba32Backdoor.IRC.Zapchast.zwrc
V-BusterTrojan.mIRC-Based.AM

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 were analyzed:

  • %USERPROFILE%\local settings\temp\68a521cd1d46ae3b99d18f4c4dabe1b5.exe
  • The following files have been added to the system:

  • %TEMP%\spoolsv
  • %TEMP%\spoolsv\a.reg
  • %TEMP%\spoolsv\aliases.ini
  • %TEMP%\spoolsv\com.mrc
  • %TEMP%\spoolsv\control.ini
  • %TEMP%\spoolsv\download
  • %TEMP%\spoolsv\fullname.txt
  • %TEMP%\spoolsv\ident.txt
  • %TEMP%\spoolsv\logs
  • %TEMP%\spoolsv\mirc.ico
  • %TEMP%\spoolsv\mirc.ini
  • %TEMP%\spoolsv\remote.ini
  • %TEMP%\spoolsv\run.bat
  • %TEMP%\spoolsv\s.mrc
  • %TEMP%\spoolsv\servers.ini
  • %TEMP%\spoolsv\sounds
  • %TEMP%\spoolsv\spoolsv.exe
  • %TEMP%\spoolsv\users.ini
  • %TEMP%\spoolsv\xmas.jpg
  • The following registry elements have been created:

  • HKEY_CURRENT_USER\software\mirc\license\
    • (default) = 5662-546732
  • HKEY_CURRENT_USER\software\mirc\lockoptions\
    • (default) = 0,4096
  • HKEY_CURRENT_USER\software\mirc\username\
    • (default) = whitehat
  • HKEY_LOCAL_MACHINE\software\classes\.cha\
    • (default) = chatfile
  • HKEY_LOCAL_MACHINE\software\classes\.chat\
    • (default) = chatfile
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\
    • (default) = chat file
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\defaulticon\
    • (default) = "c:\windows\temp\spoolsv\spoolsv.exe"
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\shell\open\command\
    • (default) = "c:\windows\temp\spoolsv\spoolsv.exe" -noconnect
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\shell\open\ddeexec\
    • (default) = %1
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\shell\open\ddeexec\application\
    • (default) = svchost
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\shell\open\ddeexec\ifexec\
    • (default) = %1
  • HKEY_LOCAL_MACHINE\software\classes\chatfile\shell\open\ddeexec\topic\
    • (default) = connect
  • HKEY_LOCAL_MACHINE\software\classes\irc\
    • (default) = url:irc protocol
    • editflags = 2
  • HKEY_LOCAL_MACHINE\software\classes\irc\defaulticon\
    • (default) = "c:\windows\temp\spoolsv\spoolsv.exe"
  • HKEY_LOCAL_MACHINE\software\classes\irc\shell\open\command\
    • (default) = "c:\windows\temp\spoolsv\spoolsv.exe" -noconnect
  • HKEY_LOCAL_MACHINE\software\classes\irc\shell\open\ddeexec\
    • (default) = %1
  • HKEY_LOCAL_MACHINE\software\classes\irc\shell\open\ddeexec\application\
    • (default) = svchost
  • HKEY_LOCAL_MACHINE\software\classes\irc\shell\open\ddeexec\ifexec\
    • (default) = %1
  • HKEY_LOCAL_MACHINE\software\classes\irc\shell\open\ddeexec\topic\
    • (default) = connect
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\currentversion\uninstall\mirc\
    • displayname = mirc
    • uninstallstring = "c:\windows\temp\spoolsv\spoolsv.exe" -uninstall
  • HKEY_LOCAL_MACHINE\system\currentcontrolset\services\svchost\parameters\
    • appdirectory = "c:\windows\temp\spoolsv\spoolsv.exe"
    • application = "c:\windows\temp\spoolsv\spoolsv.exe"
  • The following registry elements have been changed:

  • HKEY_CURRENT_USER\software\winrar sfx\
    • c%%windows%temp%spoolsv% = c:\windows\temp\spoolsv\
  • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\currentversion\run\
    • spoolsv = "c:\windows\temp\spoolsv\spoolsv.exe"
  • The applications created the following network connection(s):

  • 208.83.20.130:6667 (irc)
    • NICK clinto
    • NICK clinto USER edwards "" "208.83.20.130" :robert
    • NICK clinto USER edwards "" "208.83.20.130" :robert NICK :louised
    • NICK clinto
      USER edwards "" "208.83.20.130" :robert NICK :louised MODE clinto +i
    • NICK clinto
      USER edwards "" "208.83.20.130" :robert
      NICK :louised MODE clinto +i WATCH C S
    • NICK clinto
      USER edwards "" "208.83.20.130" :robert
      NICK :louised MODE clinto +i WATCH C S MODE clinto +iwx
    • NICK clinto
      USER edwards "" "208.83.20.130" :robert
      NICK :louised MODE clinto +i WATCH C S MODE clinto +iwx SILENCE +*!*@*
    • NICK clinto
      USER edwards "" "208.83.20.130" :robert
      NICK :louised
      MODE clinto +i
      WATCH C S MODE clinto +iwx SILENCE +*!*@* MODE clinto +iwx
  • 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