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Virus:Worm/Reclog.A.15
Date discovered:16/03/2011
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:244.816 Bytes
MD5 checksum:32530b68d78e5bcbd73a138276f45490
VDF version:7.10.09.195
IVDF version:7.11.04.218 - Wednesday, March 16, 2011

 General Aliases:
   •  Kaspersky: Trojan-Spy.Win32.Zbot.bjml
   •  F-Secure: Trojan-Spy.Win32.Zbot.bjml
   •  Bitdefender: Trojan.Spy.ZBot.ESK
     GData: Trojan.Spy.ZBot.ESK
     DrWeb: Trojan.PWS.SpySweep.44


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


Side effects:
   • Drops malicious files
   • Registry modification

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



It deletes the initially executed copy of itself.



The following file is created:

C:\Recycle.Bin\config.bin



It tries to execute the following file:

Filename:
   • C:\Recycle.Bin\Recycle.Bin.exe

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

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



The following registry keys are added:

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

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

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

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings]
   • "GlobalUserOffline"=dword:0x00000000
   • "ProxyEnable"=dword:0x00000000
   • "ProxyHttp1.1"=dword:0x00000001
   • "WarnOnIntranet"=dword:0x00000000
   • "WarnOnPostRedirect"=dword:0x00000000

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

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

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

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



The following registry keys are changed:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Internet Settings\
   Zones\1]
   New value:
   • "1406"=dword:0x00000000
   • "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
   • "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]
   New value:
   • "EnableHttp1_1"=dword:0x00000001
   • "MigrateProxy"=dword:0x00000001
   • "WarnOnPost"=hex:00,00,00,00

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

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

 Backdoor Contact server:
All of the following:
   • mar**********.com:443 (TCP)
   • http://markizak.com/BViewbv32y77ebcbc/**********?guid=%character string%&ver=%number%&ie=%character string%&os=%character string%&ut=%character string%&ccrc=%character string%&md5=%character string%&plg=%character string%&stat=%character string%



Sends information about:
    • Computer name
     Current user
     Current malware status
     Platform ID
     Information about the Windows operating system

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

    Process name:
   • explorer.exe



It injects itself as a remote thread into a process.

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 Mutex:
   • zIlYJZJUU9uUuUUBP0RXELMSIEuU3

 File details Programming language:
The malware program was written in MS Visual C++.


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, June 7, 2011
Description updated by Petre Galan on Tuesday, June 7, 2011

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