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Virus:TR/Buzus.hmxh
Date discovered:05/05/2011
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:46.084 Bytes
MD5 checksum:21a5776cac8cea4aae3785b9cef66cf2
VDF version:7.11.07.154 - Thursday, May 5, 2011
IVDF version:7.11.07.154 - Thursday, May 5, 2011

 General Methods of propagation:
    Autorun feature
    Messenger


Aliases:
   •  Kaspersky: Trojan.Win32.Buzus.hmxh
   •  F-Secure: Trojan.Win32.Buzus.hmxh
   •  Bitdefender: Trojan.Generic.KD.210868
     GData: Trojan.Generic.KD.210868
     DrWeb: BackDoor.IRC.Sdbot.15749


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


Side effects:
   • Third party control
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %HOME%\Application Data\svchost.exe
   • %drive%\SelfUpdate.exe



The following files are created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%SYSDIR%\system.acm



It tries to execute the following file:

Filename:
   • %HOME%\Application Data\svchost.exe

 Registry The following registry keys are added in order to run the processes after reboot:

[HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • "Adobe Flash"="%HOME%\Application Data\svchost.exe"

[HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • "Adobe Flash"="%HOME%\Application Data\svchost.exe"



The values of the following registry keys are removed:

–  [HKCU\Software\Microsoft\Windows\CurrentVersion\Run]
   • HnINVKqyzxDahoSfeuyCsShaKrtPrvKGoDccDMYBUzXpPpBuNw
   • King_ar
   • Microsoft Software
   • Microsoft iexplorer
   • Microsotf
   • Mircosoft Explorer
   • Msn Messsenger
   • Windows
   • api32
   • cdoosoft
   • dso32
   • king_mg
   • winlog.exe

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • Alcmtr
   • Intel i386
   • Microsoft
   • Microsoft Software
   • Microsoft iexplorer
   • Microsotf
   • Mircosoft Explorer
   • Persistence
   • nwiz
   • run32
   • svchost
   • upwin

 Messenger It is spreading via Messenger. The characteristics are described below:

 Windows Messenger

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.

 IRC To deliver system information and to provide remote control it connects to the following IRC Server:

Server: kmal.ms6**********.net
Port: 3921
Channel: #iii
Nickname: [N]{USA-XP|135242}

 Miscellaneous Mutex:
It creates the following Mutex:
   • 7iexpsdsdddddddad1

 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 28, 2011
Description updated by Petre Galan on Tuesday, June 28, 2011

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