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Virus:TR/Dldr.VB.acyt
Date discovered:16/02/2011
Type:Trojan
Subtype:Downloader
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:131.072 Bytes
MD5 checksum:e236663e37905f7cdbb3b7c1b3535c2b
VDF version:7.10.08.215
IVDF version:7.11.03.121 - Wednesday, February 16, 2011

 General Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.VB.acyt
   •  Bitdefender: Trojan.Generic.KD.87975
   •  Panda: Trj/SpyEyes.E
     GData: Trojan.Generic.KD.87975


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


Side effects:
   • Drops malicious files
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • C:\abibasdsvd.exe\abibasdsvd.exe



It deletes the initially executed copy of itself.



The following file is created:

C:\abibasdsvd.exe\config.bin



It tries to execute the following file:

Filename:
   • C:\abibasdsvd.exe\abibasdsvd.exe

 Registry The following registry key is added in order to run the process after reboot:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "abibasdsvd.exe"="C:\abibasdsvd.exe\abibasdsvd.exe"



The following registry keys are added:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\0]
   • "1409"=dword:0x00000003

[HKCU\Software\Microsoft\Internet Explorer\PhishingFilter]
   • "ShownServiceDownBalloon"=dword:0x00000000

[HKCU\Software\Microsoft\Internet Explorer\Recovery]
   • "ClearBrowsingHistoryOnExit"=dword:0x00000000



The following registry keys are changed:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\1]
   New value:
   • "1406"=dword:0x00000000
   • "1409"=dword:0x00000003
   • "1609"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\0]
   New value:
   • "1406"=dword:0x00000000
   • "1609"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\2]
   New value:
   • "1406"=dword:0x00000000
   • "1409"=dword:0x00000003
   • "1609"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Lockdown_Zones\4]
   New value:
   • "1406"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Lockdown_Zones\1]
   New value:
   • "1406"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Lockdown_Zones\2]
   New value:
   • "1406"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Lockdown_Zones\3]
   New value:
   • "1406"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\3]
   New value:
   • "1406"=dword:0x00000000
   • "1409"=dword:0x00000003
   • "1609"=dword:0x00000000

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\4]
   New value:
   • "1406"=dword:0x00000000
   • "1409"=dword:0x00000003
   • "1609"=dword:0x00000000

[HKCU\Software\Microsoft\Internet Explorer\PhishingFilter]
   New value:
   • "EnabledV8"=dword:0x00000000

 Backdoor Contact server:
The following:
   • http://www.analservice.eu/helper/**********?guid=%character string%&ver=%number%&stat=%character string%&ie=%character string%&os=%character string%&ut=%character string%&cpu=%number%&ccrc=%character string%&md5=%character string%



Sends information about:
    • Computer name
    • CPU type
     Current malware status
     Username
     Information about the Windows operating system

 Stealing It tries to steal the following information:
 Recorded passwords used by the AutoComplete function

The password from the following program:
   • Mozilla Firefox

 Injection It injects itself as a remote thread into a process.

    Process name:
   • explorer.exe


It is injected into all processes.


 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • http://www.microsoft.com/


Mutex:
It creates the following Mutexes:
   • __fdbnfd__
   • __SPYNET_REPALREADYSENDED__

 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 Thursday, July 7, 2011
Description updated by Andrei Ivanes on Friday, July 15, 2011

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