Threat Description

Chango

Details

Aliases: Chango
Category: Malware
Type:
Platform: W32

Summary


This is a Visual Basic Script trojan that has been spammed as "Men & Women.html".



Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More

Detailed instructions for F-Secure security products are available in the documentation found in the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for further assistance.



Technical Details


Part of the code is encrypted and decrypts on the fly. If a user open this file Chango first checks the Visual Basic Script version. If it is more than 4 then it creates two files: "C:\WINDOWS\LOGOS.SYS" and "C:\WINDOWS\LOGOW.SYS". Those files are scriptlet objects and contain the string "TROJAN.Chango".

After that the trojan attempts to create in the Windows startup directory of English, Spanish and Portuguese environments the file "TROJAN.CHANGO.HTM".

Further every time the a system is rebooted it will run the IE and open "TROJAN.CHANGO.HTM" that looks like:

Chango doesn't contain any destructive payload.





Technical Details:Katrin Tocheva and Sami Rautiainen, F-Secure


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