Name :	ADODB.Stream
Size:	varies
Category:	Trojan
Type:	Exploit, Trojan
Date of Discovery:	May 01, 2006

Exploit.JS.ADODB.Stream is a generic detection name given to all Java Script programs that uses known exploits in Internet Explorer combined with the use of ADODB.Stream functionality in ActiveX. It contains a code that uses a vulnerability in the Internet Explorer to execute.

Automatic Disinfection

Usually standalone malware (backdoors, worms, trojans, etc.) is automatically removed by F-Secure Anti-Virus (FSAV) starting from version 5.40. Malware files get automatically renamed by FSAV, so they can not be started any more. In some rare cases, when automatic disinfection is not possible, a user can select disinfection action by him/herself to make FSAV rename or delete an infected file. In some special cases it is recommended to use specific disinfection tools provided by F-Secure. They can be downloaded from our ftp site:

ftp://ftp.f-secure.com/anti-virus/tools/

F-Secure Anti-Virus can be purchased from our webshop or from our authorised distributors. A trial version F-Secure Anti-Virus, limited to 30 days, can be downloaded from our website:

http://www.f-secure.com/download-purchase/

All the latest versions of FSAV can download anti-virus database updates automatically. However, these updates can be also downloaded and installed manually from our web or ftp sites:

http://www.f-secure.com/download-purchase/updates.shtml


Manual Disinfection

To manually disinfect standalone malware (backdoors, worms, trojans, etc.) it's usually enough to delete all infected files from a computer and to restart it. Active malware files are usually locked by operating system so different disinfection approaches are required for different operating systems.
Please note that manual disinfection is a risky process, so it is recommended only for advanced users.

If Windows 95, 98 and ME operating system is used, it is recommended to restart a computer from a bootable system diskette and to delete an infected file from command prompt. For example if a malicious file named ABC.EXE is located in Windows folder, it is usually enough to type the following command at command prompt:

DEL C:\WINDOWS\ABC.EXE

and to press Enter. After that an infected file will be gone. If Windows NT, 2000 or XP is used, a malicious file has to be renamed with a different extension (for example .VIR) and then a system has to be restarted. After restart a renamed malicious file will no longer be active and it can be easily deleted manually.


Malware Disinfection Tools

F-Secure provides disinfection tools for certain malware. These tools can be downloaded from this webpage:

http://www.f-secure.com/download-purchase/tools.shtml

ftp://ftp.f-secure.com/anti-virus/tools/


Windows System Restore Issues

If Windows ME or XP is used, it is recommended to disable System Restore feature of these operating systems to prevent a computer from re-infection by an already removed malware. The fact is that System Restore feature of these operating systems might save an infected file into the special folder and copy it back to a hard drive it every time it's been renamed or deleted by F-Secure Anti-Virus or by a user. Instructions on how to disable System Restore feature are here:

Windows ME:
http://www.f-secure.com/v-descs/sfc_dis.shtml

Windows XP:
http://www.f-secure.com/v-descs/sfc_dis1.shtml

It is recommended to re-enable System Restore after disinfection in order to restore stable system configuration in the future, if any crash or incompatibility issue occurs.


Failed Disinfection

In some cases F-Secure Anti-Virus might not disinfect a system automatically. In this case please visit our Support pages:

http://support.f-secure.com/enu/home/virusproblem/howtoclean/

Exploit.JS.ADODB.Stream is a detection name given to all Java Script programs that use known exploits in Internet Explorer combined with the use of ADODB.Stream functionality in ActiveX. These java script trojans, which are usually embedded within websites, use known vulnerabilities that allow remote code execution of potentially malicious files.

It may arrive on the system upon access to malicious websites. It may also be spammed through links that arrive via instant messenging applications, which is propagated by another malware. One example of which is AutoIt.X, a trojan that spams links of malicious websites to contacts in Yahoo! Messenger. These malicious sites are all detected as Exploit.JS.ADODB.Stream.e.

Exploit.JS.ADODB.Stream script trojans takes advantage of the ADODB.Stream object in ActiveX, which contains methods for reading and writing files. A malicious site can use this functionality combined with known vulnerabilities in Internet Explorer to allow remote code execution in an infected machine. Using a vulnerable web browser, access to malicious websites, detected as a variant of Exploit.JS.ADODB.Stream, will automatically download other malware and execute it onto the user's system.

Below is one of the vulnerabilities in Internet Explorer that can be used with ADODB.Stream object functionality to exploit a machine: