File Investigation Report
REGSVR32.EXE
Malicious SoftwarePC Cleanup in 3 Easy Steps
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Associated Malware Groups
The unsafe files using this name are associated with the malware groups:
- Malicious Software
- Malware Downloader
File Behavior
REGSVR32.EXE has been seen to perform the following behavior:
- The Process is packed and/or encrypted using a software packing process
- Found on infected systems and resists interrogation by security products
- Uses rootkit techniques to conceal its presence, interrogation or removal
- The Process is polymorphic and can change its structure
- Can communicate with other computer systems using HTTP protocols
- This process creates other processes on disk
- Executes a Process
- Adds a Registry Key (RUN) to auto start Programs on system start up
- Makes outbound connections to other computers using NETBIOSOUT protocols
- Executes Processes stored in Temporary Folders
- This Process Deletes Other Processes From Disk
- Modifies the Windows Host File which could be used to stop you visiting specific web sites by redirecting you to alternative addresses without you knowing
- Adds products to the system registry
- Downloads hidden code from covert web sites
- Downloads program file(s) and other content from the web
- Registers a Dynamic Link Library File
- Looks at the contents of the autoexec.bat file
- Reads email address and phone book details
- Visits web sites on your PC without you knowing
- Enables an In Process Object/Server - Common with DLL Injections
REGSVR32.EXE has been the subject of the following behavior:
- Added as a Registry auto start to load Program on Boot up
- Executed as a Process
- Created as a process on disk
- Executed from Temporary Folders
- Deleted as a process from disk
- Terminated as a Process
- Has code inserted into its Virtual Memory space by other programs
- Registered as a Dynamic Link Library File
Country Of Origin
The filename REGSVR32.EXE was first seen on May 3 2007 in the following geographical regions of the Prevx community:
- The EUROPEAN UNION on May 3 2007
- HUNGARY on May 3 2007
- The UNITED STATES on May 26 2007
Filesizes
The following file size has been seen:
- 45,752 bytes
- 71,680 bytes
- 19,456 bytes
- 11,024 bytes
File Type
The filename REGSVR32.EXE refers to many versions of an executable program.
File Activity
One or more files with the name REGSVR32.EXE creates, deletes, copies or moves the following files and folders:
- create folder C:\Program Files\Common Files\?icrosoft.NET
- Opens/modifes c:\autoexec.bat
- Creates c:\progra~1\common~1\icroso~1.net\logonui.exe
- Creates c:\progra~1\common~1\icroso~1.net\icroso~1.net\ctxad-582.000
- Creates c:\documents and settings\user\application data\Microsof
- Creates c:\documents and settings\user\application data\microsoft\Crypt
- Creates c:\documents and settings\user\application data\microsoft\crypto\RS
- Creates c:\documents and settings\user\application data\microsoft\crypto\rsa\S-1-5-21-3766738458-954458941-2556246048-100
- Creates c:\docume~1\user\locals~1\temp\ctxad.exe
- Deletes c:\docume~1\user\locals~1\temp\nsj20.tmp
- Creates c:\docume~1\user\locals~1\temp\NDrv.dll
- Creates c:\documents and settings\user\application data\Microsoft
- Creates c:\documents and settings\user\application data\microsoft\Crypto
- Creates c:\documents and settings\user\application data\microsoft\crypto\RSA
- Creates c:\documents and settings\user\application data\microsoft\crypto\rsa\S-1-5-21-3766738458-954458941-2556246048-1003
- Copies filec:\docume~1\user\locals~1\temp\NDrv.dll to c:\windows\system32\vzn.dll
- Deletes c:\docume~1\user\locals~1\temp\NDrv.dll
- Creates c:\docume~1\user\locals~1\temp\NDrv.exe
Website Activity
One or more files with the name REGSVR32.EXE interacts with the following web sites and pages. Web addresses have been deliberately modified to prevent unintentional use.
- TCP:127.0.0.1:1093 Port:17
- Port 80 IP:63.251.135.26
- Remote server connection to cu .outerinfo .co
- TCP:127.0.0.1:1097 Port:20
- Port 80 IP:63.251.135.16
- Port 80 IP:8.15.231.92
- Port 80 IP:8.15.231.4
- Port 80 IP:63.251.135.17
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