Virus.Win32.Small.r

Kaspersky:Virus.Win32.Small.r

[hide=50]

http://file.citecclub.org/download.php?id=278C1A71

pass:virus

Malware type: Worm

Aliases: Virus.Win32.Small.r (Kaspersky), Generic BackDoor.j (McAfee), W32.SillyDC (Symantec), W32/Small.R (Avira), W32/SillyFDC-H (Sophos), Virus:Win32/Small.R (Microsoft)

In the wild: Yes

Destructive: No

Language: English

Platform: Windows NT, 2000, XP, Server 2003

Encrypted: No

Infection Channel 1 : Propagates via removable drives

Description:

This worm propagates via removable drives. It does the said routine by creating the folder RECYCLER in all available removable drives, then dropping copies of itself in the said folder.

Moreover, it arrives on a system as a file downloaded from the Internet by an unsuspecting user when visiting a malicious Web site, or may be dropped by another malware.

It also drops an AUTORUN.INF file in the root folder of the removable drive to automatically execute the dropped copy when the drives are accessed.

MANUAL REMOVAL INSTRUCTIONS

Identifying the Malware Program

To remove this malware, first identify the malware program.

1. Scan your computer with your Trend Micro antivirus product.
2. NOTE the path and file name of all files detected as WORM_SMALL.HYN.

Trend Micro customers need to download the latest virus pattern file before scanning their computer. Other users can use Housecall, the Trend Micro online virus scanner.

Terminating the Malware Program

Since this malware uses a file name that is also the file name of a legitimate process, it is necessary to use third party process viewers such as Process Explorer, to isolate the malware process itself.

If the process you are looking for is not in the list displayed by Process Explorer, proceed to the succeeding solution set.

1. Download Process Explorer.
2. Extract the contents of the compressed (ZIP) file to a location of your choice.
3. Execute Process Explorer by double-clicking procexp.exe.
4. In the list of running programs*, locate the malware file(s) detected earlier.
5. Right-click the malware process, and choose Properties.
6. Check if the value for the Current Directory is the same as the directory where the detected file(s) is located.
7. If yes, then right-click on the malware process, and click Kill Process Tree.
8. Close Process Explorer.

*NOTE: On computers running all Windows platforms, if the process you are looking for is not in the list displayed by Process Explorer, continue with the next solution procedure, noting additional instructions. If the malware process is in the list displayed by Process Explorer, but you are unable to terminate it, restart your computer in safe mode.

Editing the Registry

This malware modifies the computer's registry. Users affected by this malware may need to modify or delete specific registry keys or entries. For detailed information regarding registry editing, please refer to the following articles from Microsoft:

1. HOW TO: Backup, Edit, and Restore the Registry in Windows NT 4.0
2. HOW TO: Backup, Edit, and Restore the Registry in Windows 2000
3. HOW TO: Back Up, Edit, and Restore the Registry in Windows XP and Server 2003
Restoring Modified Autostart Entry from the Registry

Restoring modified autostart entries from the registry prevents the malware from executing at startup.

If the registry entry below is not found, the malware may not have executed as of detection. If so, proceed to the succeeding solution set.

1. Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
2. In the left panel, double-click the following:
HKEY_LOCAL_MACHINE>SOFTWARE>Microsoft>
Windows NT>CurrentVersion>Winlogon
3. In the right panel, locate the entry:
Userinit = "userinit.exe, %Windows%\system\svchost.exe"
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
4. Right-click on the value name and choose Modify. Change the value data of this entry to:
* %System%\userinit.exe (on Windows 2000, XP, and Server 2003)
* userinit.exe,nddeagnt.exe (on Windows NT)
(Note: %System% is the Windows system folder, which is usually C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
5. Close Registry Editor.

Restoring AUTORUN.INF

1. Open AUTORUN.INF using Notepad on the drive where the malware was detected earlier.
2. Delete the following lines created by the malware:
[code]open=