WORM_UTOTI.DD
Symantec : W32.Harakit; Mcafee : [.au3]:W32/Autorun.worm.zf.gen
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This worm adds registry entries to enable its automatic execution at every system startup. It modifies registry entries to enable its automatic execution at every system startup.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system. It uses icons similar to those of legitimate applications to entice a user to click them.
TECHNICAL DETAILS
Installation
This worm drops the following copies of itself into the affected system:
- %System%\csrcs.exe
- %System%\{numbers}.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
It drops the following files:
- %System%\autorun.inf - autorun component
- [DRIVE]:\xerfoj1 - empty file
(Note: %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
csrcs = %System%\csrcs.exe
It modifies the following registry entry(ies) to enable its automatic execution at every system startup:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Shell = Explorer.exe csrcs.exe
(Note: The default value data of the said registry entry is Explorer.exe.)
Other System Modifications
This worm adds the following registry keys:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
DRM\amty
Propagation
This worm drops the following copy(ies) of itself in all removable drives:
- {random}.exe
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
The said .INF file contains the following strings:
;{garbage codes}
[AuTOrUn
;{garbage codes}
open={random}.exe
;{garbage codes}
shell\open\Command={random}.exe
;{garbage codes}
shell\open\Default=1
;{garbage codes}
It uses icons similar to those of legitimate applications to entice a user to click them.
Other Details
This worm connects to the following URL(s) to get the affected system's IP address:
- http://www.whatismyip.com/
It connects to the following possibly malicious URL:
- http://{BLOCKED}xh.dip.jp:38544/po.php - inaccessible as of this writing
- http://{BLOCKED}xh.dip.jp:38544/limp.gif - contains garbage codes
It does the following:
- It connects to http://{BLOCKED}atebay.org/ to check for top software downloads
SOLUTION
Step 1
For Windows ME and XP users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Step 2
Identify and terminate files detected as WORM_UTOTI.DD
- 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.
Step 3
Restore this modified registry value
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.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
- From: Shell = Explorer.exe csrcs.exe
To: Shell = Explorer.exe
- From: Shell = Explorer.exe csrcs.exe
Step 4
Delete this registry key
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.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\DRM
- amty
- amty
Step 5
Delete this registry value
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.
- In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
- csrcs = %System%\csrcs.exe
- csrcs = %System%\csrcs.exe
Step 6
Search and delete this file
Step 7
Search and delete AUTORUN.INF files created by WORM_UTOTI.DD that contain these strings
Step 8
Scan your computer with your Trend Micro product to delete files detected as WORM_UTOTI.DD 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.
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