Net-Worm:W32/Koobface.CY
| Name : | Net-Worm:W32/Koobface.CY |
| Detection Names : |
Net-Worm:W32/Koobface.CY |
| Aliases : |
TR/Dldr.Agent.atbf.1 (Avira) W32/Koobfa-Gen (Sophos) Worm:Win32/Koobface.gen!A (Microsoft) W32/Koobface.worm (McAfee) W32.Koobface.B (Symantec) |
| Size: | 27136 |
| Category: | Malware |
| Type: | Net-Worm |
| Platform: | W32 |
Summary
A type of worm that replicates by sending complete, independent copies of itself over a network.
Additional Details
This malware is installed via a fake YouTube webpage (where it is posing as a Flash player update) displayed by Net-Worm:W32/Koobface.CZ.
The purpose of this malware is to post comments with HTML links in various online networking locations in order to spread itself.
The following sites are referenced in the body of Koobface.CY:
The routines in Koobface.CY directly target Facebook and the other sites are not used by this variant.
Execution
Upon execution, the malware will create these files:
It will also display this fake error message:
The malware will then add this entry to the registry so that it will be able to insert an HTML page into another HTML page; this ability can be used to insert comments in user pages inside networking sites.
Once installed, Koobface.CY will send an HTTP POST message to this location in order to retrieve the information that it will use as comments:
The site also contains the malware download location.
In addition, Koobface.CY contains a routine to connect to these locations:
The gen.php location also contains information that can be posted as comments on different websites.
Packer
Koobface.CY is packed with UPX.
The purpose of this malware is to post comments with HTML links in various online networking locations in order to spread itself.
The following sites are referenced in the body of Koobface.CY:
• bebo.com
• blackplanet.com
• facebook.com
• friendster.com
• myspace.com
• myyearbook.com
The routines in Koobface.CY directly target Facebook and the other sites are not used by this variant.
Execution
Upon execution, the malware will create these files:
• %windir%\bolivar28.exe
- Copy of the malware
- Copy of the malware
• %windir%\fmark2.dat
- Malware's data file
- Malware's data file
• c:\1.reg
- Contains a routine to add entries to the registry
- Contains a routine to add entries to the registry
• c:\64234543.bat
- Cleanup routine
- Cleanup routine
It will also display this fake error message:
The malware will then add this entry to the registry so that it will be able to insert an HTML page into another HTML page; this ability can be used to insert comments in user pages inside networking sites.
• HKEY_CLASSES_ROOT\Mime\Database\Content Type\application/xhtml+xml
"CLSID"="{25336920-03F9-11cf-8FD0-00AA00686F13}"
"Extension"=".xml"
"Encoding"=hex:08,00,00,00
"CLSID"="{25336920-03F9-11cf-8FD0-00AA00686F13}"
"Extension"=".xml"
"Encoding"=hex:08,00,00,00
Once installed, Koobface.CY will send an HTTP POST message to this location in order to retrieve the information that it will use as comments:
• http://y171108.com/[...]/first.php
The site also contains the malware download location.
In addition, Koobface.CY contains a routine to connect to these locations:
• http://y171108.com/[...]/logs.php
• http://y171108.com/[...]/gen.php
The gen.php location also contains information that can be posted as comments on different websites.
Packer
Koobface.CY is packed with UPX.