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 Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



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


SUBMIT A SAMPLE

Suspect a file or URL was wrongly detected? Submit a sample to our Labs for analysis

Submit Now

Scan & clean your PC

F-Secure Online Scanner will scan and clean your PC in just a few minutes for free

Learn More