WORM_AUTORUN.YG
Worm:Win32/Chir.D@mm (Microsoft); W32/Autorun.worm.dk (McAfee); W32.SillyFDC (Symantec); Worm.Win32.AutoRun.edq, Worm.Win32.AutoRun.haa (Kaspersky); Trojan.Win32.Malware (fs) (Sunbelt)
Windows 2000, Windows XP, Windows Server 2003
Threat Type: Worm
Destructiveness: No
Encrypted:
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.
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.
Autostart Technique
This worm adds the following registry entries to enable its automatic execution at every system startup:
HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
crazy = "%User Profile%\Application Data\crazya.exe"
Other System Modifications
This worm deletes the following files:
- %System Root%\,.exe
- %Windows%\debug\,.exe
- d:\,.exe
- e:\,.exe
- f:\,.exe
- g:\,.exe
- %System%\isass.exe
- %Windows%\Bit@UOM.dll.vbs
- %System Root%\Bit@UOM.dll.vbs
- d:\Bit@UOM.dll.vbs
- e:\Bit@UOM.dll.vbs
- f:\Bit@UOM.dll.vbs
- g:\Bit@UOM.dll.vbs
- %System%\killVBS.vbs
- %Windows%\SSCVIHOST.exe
- %System%\SSCVIHOST.exe
- %System%\drivers\spoclsv.exe
- %System%\lsass.exe
- %System Root%\new folder.exe
- d:\new folder.exe
- e:\new folder.exe
- f:\new folder.exe
- g:\new folder.exe
(Note: %System Root% is the root folder, which is usually C:\. It is also where the operating system is located.. %Windows% is the Windows folder, which is usually C:\Windows.. %System% is the Windows system folder, which is usually C:\Windows\System32.)
It adds the following registry entries:
HKEY_CURRENT_USER\Software\Microsoft\
Internet Explorer\Main
Window Title = "gods must be creazy!!!!"
Dropping Routine
This worm drops the following files:
- %Common Startup%\MSconfig.exe
- %User Profile%\Application Data\crazya.exe
(Note: %Common Startup% is the system's shared Startup folder, which is usually C:\Documents and Settings\All Users\Start Menu\Programs\Startup on Windows 2000, XP, and Server 2003.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)
This report is generated via an automated analysis system.
SOLUTION
Step 1
Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.
Step 2
Restart in Safe Mode
Step 3
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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
- crazy = "%User Profile%\Application Data\crazya.exe"
- In HKEY_CURRENT_USER\Software\Microsoft\Internet Explorer\Main
- Window Title = "gods must be creazy!!!!"
Step 4
Search and delete these components
- %Common Startup%\MSconfig.exe
- %User Profile%\Application Data\crazya.exe
Step 5
Restart in normal mode and scan your computer with your Trend Micro product for files detected as WORM_AUTORUN.YG. 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.
Step 6
Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.
- %System Root%\,.exe
- %Windows%\debug\,.exe
- d:\,.exe
- e:\,.exe
- f:\,.exe
- g:\,.exe
- %System%\isass.exe
- %Windows%\Bit@UOM.dll.vbs
- %System Root%\Bit@UOM.dll.vbs
- d:\Bit@UOM.dll.vbs
- e:\Bit@UOM.dll.vbs
- f:\Bit@UOM.dll.vbs
- g:\Bit@UOM.dll.vbs
- %System%\killVBS.vbs
- %Windows%\SSCVIHOST.exe
- %System%\SSCVIHOST.exe
- %System%\drivers\spoclsv.exe
- %System%\lsass.exe
- %System Root%\new folder.exe
- d:\new folder.exe
- e:\new folder.exe
- f:\new folder.exe
- g:\new folder.exe
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