This Worm connects to certain URLs. It may do this to remotely inform a malicious user of its installation. It may also do this to download possibly malicious files onto the computer, which puts the computer at a greater risk of infection by other threats.
Installation
This Worm drops the following copies of itself into the affected system:
- %System%\svchost .exe
- %Windows%\regsvr.exe
- %System%\regsvr.exe
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.)
Other System Modifications
This Worm adds the following registry keys:
Download Routine
This Worm connects to the following malicious URLs:
- {BLOCKED}
- {BLOCKED}
- {BLOCKED}
- {BLOCKED}
Step 1
Terminate the malware/grayware/spyware process:
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Notes=
For Windows 98 and ME users, Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps. To terminate the malware/grayware/spyware process:
- Scan your computer with your Trend Micro product and then take note of the names of the malware file(s) detected.
- Open Windows Task Manager.
• For Windows 98 and ME users, press
CTRL+ALT+DELETE
• For Windows NT, 2000, XP, and Server 2003 users, press
CTRL+SHIFT+ESC, then click the Processes tab. - In the list of running programs, locate a malware/grayware/spyware file detected earlier.
- Select the detected files, then press either the End Task or the End Process button, depending on the version of Windows you are using.
- Do the same for the remaining detected malware/grayware/spyware files in the list of running programs.
- To check if the malware/grayware/spyware process has been terminated, close Task Manager, and then open it again.
- Close Task Manager.
Step 2
Delete this registry value
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer"s registry.
- HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Policies\Explorer
- HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Policies\SYSTEM
- HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Explorer\WorkgroupCrawler\Shares
To delete the registry value this malware/grayware/spyware created:
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
In the left panel of the Registry Editor window, double-click the following:HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Policies\SYSTEMIn the right panel, locate and delete the entry:DisableTaskMgr=0 - In the right panel, locate and delete the entry:
In the right panel, locate and delete the entry:DisableRegistryTools = 0 - In the left panel, double-click the following:
In the left panel of the Registry Editor window, double-click the following:HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Explorer\WorkgroupCrawler\SharesIn the right panel, locate and delete the entry:shared=\New Folder .exe - In the right panel, locate and delete the entry:
= - Close Registry Editor.
Step 3
Restore this modified registry value
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Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer"s registry.
- HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\Winlogon
- From: Shell=Explorer.exe regsvr.exe
+ To: Shell=Explorer.exe
- HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Policies\SYSTEM
- From: DisableRegistryTools=1
+ To: DisableRegistryTools=0
To restore the registry value this malware/grayware/spyware modified:
- Open Registry Editor. Click Start>Run, type REGEDIT, then press Enter.
- In the left panel, double-click the following:
In the left panel of the Registry Editor window, double-click the following:HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\WINDOWS NT\CURRENTVERSION\WinlogonIn the right panel, locate the registry value: Shell=Explorer.exe regsvr.exe - In the right panel, locate the registry value:
Right-click on the value name and choose Modify. Change the value data of this entry to: Explorer.exe = - In the left panel, double-click the following:
In the left panel of the Registry Editor window, double-click the following:HKEY_CURRENT_USER\SOFTWARE\MICROSOFT\Windows\CURRENTVERSION\Policies\SYSTEMDisableRegistryTools=1 - In the right panel, locate the registry value:
= - Right-click on the value name and choose Modify. Change the value data of this entry to:
=
- Close Registry Editor.
Step 4
Search and delete these files
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There may be some component files that are hidden. Please make sure you check the
Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.
- %System%\svchost .exe
- %Windows%\regsvr.exe
- %System%\regsvr.exe
Note: To do a search for the following files, right-click Start then click
Search... or
Find..., depending on the version of Windows you are running. For each file to be deleted, type its file name in the
Named input box. In the Look In drop-down list, select
My Computer, then press Enter.
Once located, select the file then press SHIFT+DELETE to permanently delete the file. Repeat the said steps for all files listed. Step 5
Restore this file from backup Only Microsoft-related files will be restored. If this malware/grayware/spyware also deleted files related to programs that are not from Microsoft, please reinstall those programs on your computer again.
Step 6
Scan your computer with your Trend Micro product to delete files detected as
WORM_SOHANAD.DIP
*Note: If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
