Prevx Research Division
W98.COM
Cloaked MalwareFree PC Cleanup from Webroot
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Associated Malware Groups
The filename is associated with the malware groups:
- Cloaked Malware
- Worm
File Behavior
W98.COM has been seen to perform the following behavior:
- The Process is packed and/or encrypted using a software packing process
- Executes a Process
- This Process Deletes Other Processes From Disk
- Copies files
- This process creates other processes on disk
- Creates a new Background Service on the machine
- Injects code into other processes
- Writes to another Process's Virtual Memory (Process Hijacking)
- Injects code into other processes
- Registers a Dynamic Link Library File
- Loads and Executes a System Driver File
- Found on infected systems and resists interrogation by security products
- Uses low level functions to hide itself from the user and from system/security processes
W98.COM has been the subject of the following behavior:
- Executed as a Process
- Deleted as a process from disk
- Copied to multiple locations on the system
- Created as a process on disk
- Added as a Registry auto start to load Program on Boot up
- This program is often downloaded from the web
- Executed from Temporary Folders
- Executed by Internet Explorer
- Registered as a Dynamic Link Library File
Country Of Origin
The filename W98.COM was first seen on Jan 21 2009 in the following geographical regions of the Webroot community:
- Europe on Jan 21 2009
- Mongolia on Jan 22 2009
- Vietnam on Sep 23 2010
- The United Kingdom on Sep 23 2010
- Saudi Arabia on Jan 4 2011
File Name Aliases
W98.COM can also use the following file names:
- OLHRWEF.EXE
- HELP.EXE
- J60OSK9.CMD
- W98.COM.000
- UVSQFGWD.CMD
- GFQGQ.CMD
- HL80C6B1.COM
- GY.EXE
- A2H2.COM
- E15B38~1.COM
- 26691015.COM
Filesizes
The following file size has been seen:
- 155,876 bytes
- 185,856 bytes
- 107,882 bytes
- 107,983 bytes
File Type
The filename W98.COM refers to many versions of an executable program.
File Activity
One or more files with the name W98.COM creates, deletes, copies or moves the following files and folders:
- Creates c:\windows\system32\drivers\klif.sys
- Deletes c:\windows\system32\drivers\klif.sys
- Deletes c:\windows\system32\olhrwef.exe
- Deletes c:\windows\system32\nmdfgds0.dll
- Creates c:\windows\system32\nmdfgds0.dll
- Deletes c:\w98.co
- Copies filec:\windows\system32\olhrwef.exe to c:\w98.co
- Deletes c:\autorun.in
- Creates c:\autorun.in
- Deletes d:\w98.co
- Copies filec:\windows\system32\olhrwef.exe to d:\w98.co
- Deletes d:\autorun.in
- Creates d:\autorun.in
- Deletes c:\docume~1\user\locals~1\temp\help1.rar
- Opens/modifes c:\autoexec.bat
- Creates c:\docume~1\user\locals~1\temp\help1.rar
Website Activity
One or more files with the name W98.COM interacts with the following web sites and pages. Web addresses have been deliberately modified to prevent unintentional use.
- TCP:127.0.0.1:1102 Port:19
- Port 80 IP:221.1.204.243
- TCP:127.0.0.1:1106 Port:18
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