Threat Description

Exploit: W32/Ani.C

Details

Category: Malware
Type: Exploit
Platform: W32
Date Discovered: March 29, 2007
Aliases: Trojan-Downloader.Win32.Ani.g, Exploit.Win32.IMG-ANI.c

Summary


This type of trojan secretly downloads malicious files from a remote server, then installs and executes the files.



Removal


Automatic action

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

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

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

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.



Technical Details


Exploit:W32/Ani.C is a trojan that exploits a vulnerability in Windows' animated cursor handling of .ANI files in order to download and install other malware to the system.

Distribution

These malicious animated cursor (.ANI) files can be hosted on websites and can trigger code execution upon visiting such sites. They can also be embedded in specially crafted e-mails or attachments within the e-mail that upon reading or previewing can cause the system to execute the code.

This trojan was seen hosted at the following site:

  • https://newasp.com.cn/[REMOVED].jpg

Other sites found also links or loads the malicious .ANI file:

  • https://newasp.com.cn/[removed].htm
  • https://bc0.cn/[removed].js
Execution

Upon successful execution, this trojan may download other malware via the Internet and execute it on the system. Below are the download sites used:

  • https://newasp.com.cn/[removed].exe - Trojan-PSW:W32/Agent.IM
  • https://61.218.38.35/images/[removed].exe - Trojan-Downloader:Win32/Tiny.GG
  • https://220.71.76.xxx/wincf.exe - Trojan-Downloader:W32/Small.EKV

More information about this malware can be found from our weblog post.






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