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Virus:TR/Spy.ZBot.bkaa
Date discovered:19/04/2011
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:246.272 Bytes
MD5 checksum:cbb8611337f0435726d4d504d1c9e3c3
VDF version:7.11.06.176 - Tuesday, April 19, 2011
IVDF version:7.11.06.176 - Tuesday, April 19, 2011

 General Aliases:
   •  Kaspersky: Trojan-Spy.Win32.Zbot.bkaa
   •  F-Secure: Trojan-Spy.Win32.Zbot.bkaa
   •  Bitdefender: Trojan.Generic.KD.192707
   •  GData: Trojan.Generic.KD.192707
   •  DrWeb: Trojan.PWS.SpySweep.42


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

– [HKEY_USERS\.DEFAULT\SOFTWARE\Microsoft Windows]
   • "000002C8EFC5BA55"=hex:5E,A3,78,C0,F7,F6,F6,F6,F6,F1,F2,F2,F2,F2,F0,F0,F0,F0,FD,FD,FD,FD,89,E6,C6,B2,D3,B1,DD,B8,B8,CA,AF,DF,EE,9E,9C,9C,80,AA,AA,AA,AA,C8,A7,D3,8C,EB,9E,F7,93,93,A6,88,B9,97,A5,93,A3,93,B2,E4,BC,91,A6,9E,A6,96,A1,91,D4,91,D2,93,A3,E0,C1,F2,CA,8F,BB,88,CA,F2,C1,A4,A2,B3,77,71,7B,0D,68,1A,69,00,6F,01,01,30,00,33,03,3A,5B,58,7A,26,2D,2D,3D,51,3E,5D,3C,50,0F,7B,12,7F,1A,1A,28,18,29,18,36,06,30,1E,2E,16,36,06,3E,04,34,01,3B,0A,32,1C,2B,1C,2C,49,4C,1D,59,5C,30,34,34,24,5E,31,5F,3A,3A,12,12,55,55,18,18,4C,4C,6C,6C,47,47,77,77,44,44,7E,7E,4E,4E,7E,7E,57,57,77,77,32,32,1C,88,88,8E,FB,FB,89,89,E6,E6,96,96,F3,BF,BB,BB,B3,E0,E0,94,94,F5,F5,9B,9B,FF,FF,9E,9E,EC,EC,88,88,A8,A8,FC,FC,95,95,F8,F8,9D,9D,FD,F6,9A,89,88,FC,95,F6,9D,39,29,2B,1A,2A,1D,2C,1A,B6,A5,A1,B2,B2,B2,B2,DD,AE,F1,1D,0B,EB,F6,9B,9D,8D,DD,CC,CC,CE,A2,C3,AD,CA,BF,DE,B9,DC,83,EA,8E,8E,BF,8F,BC,8F,8F,8F,8F,8F,9E,9E,9E

– [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
    • Username
    • 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:
   • zrVfp8X63O165mU5UUiUU5u5KUUUuU

 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.

說明撰寫者 Petre Galan 開啟 2011年6月8日星期三
說明更新者 Petre Galan 開啟 2011年6月8日星期三

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