Type: Trojan In the wild: No
Reported Infections: Low
Distribution Potential: Low
Damage Potential: Low to medium
Static file: Yes File size: 141 kb
Method of propagation: • The malware spreads itself by creating "Autorun .inf" and a "smss.exe" onto hard drive partitions,including removable media(eg flsh disk, memory card). It hides the autorun.inf by changing its file attributes
Aliases:
• Kaspersky: Virus.Win32.Autorun
• F-Secure: Virus.Win32.VB.bg
• Grisoft: Worm/VB.ZU
• Eset: Win32/VB.DA
Platforms / OS:
• Windows 98
• Windows 98 SE
• Windows NT
• Windows ME
• Windows 2000
• Windows XP
• Windows 2003
Side effects:
• Drops files
• Lowers security settings
• Registry modification
• Eject itself to every file with the following .doc extension
Files It copies itself to the following locations:
• %SYSDIR%\"barack.inf"
• %SYSDIR%\usa\smss.exe
• %SYSDIR%\usa\services.exe
• %SYSDIR%\usa\lsass.exe • %drive%\documents.exe
• %drive%\state\smss.exe
It creates the following directory:
• %drive%\state
The following registry keys are changed:
– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] Old value:
• "Shell"="Explorer.exe" • "Userinit"="%SYSDIR%\userinit.exe" New value:
• "System"="Explorer.exe "%SYSDIR%\usa\services.exe"
• "Userinit"="%SYSDIR%\usa\lsass.exe"
– [HKCR\exefile]
Old value: • @="Application"
New value: • @="Microsoft word Document"
– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug]
Old value: • "Auto"="1" • "Debugger"="drwtsn32 -p %ld -e %ld -g"
New value: • "Auto"="1" • "Debugger"="%SYSDIR%\usa\lsass.exe"
Various Explorer settings:– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
Old value: • "Hidden"=%user defined settings% • "HideFileExt"=%user defined settings% • "ShowSuperHidden"=%user defined settings%
New value: • "Hidden"=dword:00000000 • "HideFileExt"=dword:00000001 • "ShowSuperHidden"=dword:00000000
– [HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot]
Old value: • "AlternateShell"="cmd.exe"
New value: • "AlternateShell"="%SYSDIR%\usa\lsass.exe"
– [HKCR\lnkfile\shell\open\command]
Old value: • @=" "%1" %*"
New value: • @=" "%SYSDIR%\usa\lsass.exe" "%1" %*"
– [HKCR\piffile\shell\open\command]
Old value: • @=""%1" %*"
New value: • @="%SYSDIR%\usa\lsass.exe"" "%1" %*"
– [HKCR\batfile\shell\open\command]
Old value: • @=""%1" %*"
New value: • @="%SYSDIR%\usa\lsass.exe" "%1" %*"
– [HKCR\comfile\shell\open\command]
Old value: • @=""%1" %*"
New value: • @="%SYSDIR%\usa\lsass.exe" "%1" %*"
Disable Regedit and Task Manager:– [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
Old value: • "DisableCMD"=%user defined settings% • "DisableTaskMgr"=%user defined settings% • "DisableRegistryTools"=%user defined settings%
New value: • "DisableCMD"=dword:00000001 • "DisableTaskMgr"=dword:00000001 • "DisableRegistryTools"=dword:00000001
[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
Old value: • "NoFolderOptions"=%user defined settings%
New value: • "NoFolderOptions"=dword:00000001
– [HKLM\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore]
Old value: • "DisableConfig"=%user defined settings% • "DisableSR"=%user defined settings%
New value: • "DisableConfig"=dword:00000001 • "DisableSR"=dword:00000001
– [HKLM\SOFTWARE\Policies\Microsoft\Windows\Installer]
New value: • "LimitSystemRestoreCheckpointing"=dword:00000001 • "DisableMSI"=dword:00000001
– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\ CabinetState]
New value: • "FullPathAddress"=dword:00000001
Process termination List of processes that are terminated:
• regedit.exe; AVP.exe; rtvscan.exe; NAV.exe; VSHWIN32.exe; ProcessManager.exe; RegistryEditor.exe; Msiexec.exe; avgemc.exe; nvcoas.exe; mcvsescn.exe; firefox.exe; TASKMGR.EXE; setup.exe; Opera.exe; avguad.exe.; avgnt.exe; killvb.exe; Msi.exe
Processes with one of the following strings are terminated:
• ANT; BRO; VIR; TASK; REG; ASM; DBG; W32; BUG; HEX; DETEC; PROC; WALK; REST; AVS; OPTIONS; AVG; SYMANTEC; PANDA; MCAFEE; PC-CILLIN; F-PROT; KASPERSKY; VAKSIN; ANTI; VIRUS
Processes containing one of the following window titles are terminated:
• RegEdit_RegEdit
• Registry Editor
• Folder Options
• Local Settings
The following service is disabled:
• System Restore
Programming language:
•The malware program was written in Visual Basic.
Removal instruction
If your computer does not have an up-to-date antivirus, or does not have an antivirus solution at all, follow the instructions below to delete the malicious program:
Use Task Manager to terminate the virus process.
Delete the original virus file (the location will depend on how the program originally penetrated the victim machine).
change above new registry value to old value
Delete the following parameters from the system registry [HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\System]
DisableTaskMgr = 1
[HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer]
NoFolderOptions = 1
Delete the following files: %System%\buat\csrss.exe
%System%\usa\lsass.exe
%System%\usa\services.exe
%System%\usa\smss.exe
%System%\"barack.inf"
%drive%\states\smss.exe
%drive%\autorun.inf
Update your antivirus databases and perform a full scan of the computer
Be careful when editing the system registry.
Warning One incorrect change may result in the OS malfunctioning! Strictly follow the recommendations of experts when editing/changing the system registry! Recommendations We encourages all users and administrators to adhere to the following basic security
BEST PRACTICES
Turn off and remove unneeded services. By default, many operating systems install auxiliary services that are not critical, such as an FTP server, telnet, and a Web server. These services are avenues of attack.
If they are removed, blended threats have less avenues of attack and you have fewer services to maintain through patch updates.
If a blended threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services (for example, all Windows-based computers should have the current Service Pack installed.). Additionally, please apply any security updates that are mentioned in this writeup, in trusted Security Bulletins, or on vendor Web sites.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread viruses, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate infected computers quickly to prevent further compromising your organization. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
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