WORM_UTOTI.SS
Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)
![](/vinfo/imgFiles/legend.jpg)
Threat Type: Worm
Destructiveness: No
Encrypted: Yes
In the wild: Yes
OVERVIEW
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.
TECHNICAL DETAILS
Arrival Details
This worm arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
Installation
This worm drops the following copies of itself into the affected system:
- %System%\46781054.exe
- %System%\csrcs.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
It drops the following files:
- %User Temp%\suicide.bat
- %System%\autorun.inf
(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista and 7.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
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"
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\policies\
Explorer\Run
WMIX = "%System%\prexi.exe"
It modifies the following registry entries to ensure it 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".)
Propagation
This worm drops the following copies of itself in all physical and removable drives:
- gqgdih.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 code}
[AuTOrUn
;{garbage code}
open=gqgdih.exe
;{garbage code}
shell\open\Command=gqgdih.exe
;{garbage code}
shell\open\Default=1
;{garbage code}
Dropping Routine
This worm drops the following files:
- %System%\prexi.exe
(Note: %System% is the Windows system folder, which is usually C:\Windows\System32.)
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}cluster.com:5300/po.php
- http://{BLOCKED}.19.236:4700/h.php