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Virus:TR/PSW.ZGQ.8
Date discovered:07/01/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:61.952 Bytes
MD5 checksum:823fc556696c639314459a2022abfd99
IVDF version:7.10.02.127 - Wednesday, January 6, 2010

 General Aliases:
   •  Panda: W32/IRCbot.CWO
   •  Eset: Win32/IRCBot.NBC
   •  Bitdefender: Backdoor.IRCBot.ACZC


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads a malicious file
   • Drops malicious files
   • Lowers security settings
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\alrsvcf.exe
   • %SYSDIR%\asctrlsf.exe



It deletes the initially executed copy of itself.



It deletes the following file:
   • %SYSDIR%\activedsk.exe



The following files are created:

%SYSDIR%\3076z.exe
%SYSDIR%\2648628310.dat
%SYSDIR%\activedsk.exe



It tries to download a file:

– The location is the following:
   • http://nolohing.net/v44/**********




It tries to executes the following files:

– Filename:
   • %SYSDIR%\3076z.exe;%number%;%malware execution directory%\%executed file%


– Filename:
   • svchost.exe "%SYSDIR%\3076z.exe"

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\WmiSSDPSRV]
   • "DisplayName"="Windows Management Instrumentation Driver Extensions WmiSSDPSRV"
   • "ErrorControl"=dword:0x00000000
   • "ImagePath"="%SYSDIR%\3076z.exe srv"
   • "ObjectName"="LocalSystem"
   • "Start"=dword:0x00000002
   • "Type"=dword:0x00000110



The following registry keys are changed:

– [HKLM\SECURITY\Policy\Secrets\SAC\CupdTime]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAI\CupdTime]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAC\OldVal]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAI\OupdTime]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAI\CurrVal]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAC\CurrVal]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAI\OldVal]
   New value:
   • "@"=""

– [HKLM\SECURITY\Policy\Secrets\SAC\OupdTime]
   New value:
   • "@"=""

 Backdoor The following port is opened:

– M-SEARCH * HTTP/1.1 239.255.255.250 MAN: "ssdp:discover" on UDP port 1900

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Petre Galan on Tuesday, May 25, 2010
Description updated by Petre Galan on Tuesday, May 25, 2010

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