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F-Secure Malware Information Pages: Trojan:W97M/Streedom.A
[Summary] | [Disinfection] | [Detailed Description] | [Detection]

Name : Trojan:W97M/Streedom.A
Alias:Trojan:Win32/Agent.gen!C, Trojan.Dropper, Mal/Basine-A, Generic.Malware.Sdld!.B481FDFF
Size:24,923 Bytes
Type:Trojan
Category:Malware
Platform:W97M
Date of Discovery:March 29, 2007
Radar

Summary
Trojan:W97M/Streedom.A has an embedded file that downloads and installs other malware to the system.
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Disinfection

Automatic Disinfection

Usually viruses infecting boot and executable files are automatically disinfected by F-Secure Anti-Virus (FSAV). In some cases, when automatic disinfection is not possible due to file corruption or overwriting virus, a user can select disinfection action by themself 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 web or ftp sites:

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

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

F-Secure Anti-Virus can be purchased from our web shop or from our authorized 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 be downloaded and installed manually from our web or ftp sites:

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

Manual Disinfection

It is not recommended to manually disinfect files and boot sectors from viruses as it can cause damage to a system and make it unbootable.

System Restore issue and file viruses

If Windows ME or XP is used, it is recommended to disable System Restore features of these operating systems to prevent a computer from re-infection by an already removed malware. The fact is that, System Restore features of these operating systems might save an infected file into the special folder and copies it back to a hard drive every time it has 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.europe.f-secure.com/v-descs/sfc_dis.shtml

Windows XP:

http://www.europe.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 case any crash or incompatibility issue occurs.
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Detailed Description
Trojan:W97M/Streedom.A is an Rich Text Format file containing an embedded binary executable malware detected as Trojan-Downloader:W32/Streedom.A.

Here is a sample screen shot of the .RTF file:


Below is the embedded file:



Upon opening the RTF file, it will not trigger automatic execution of the embedded binary malware as it requires user intervention for Trojan-Downloader:W32/Streedom.A to run. This might be done by exporting the file, then executing it or by simply double clicking on the icon and allowing it to execute.
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Detection

F-Secure Anti-Virus detects this malware with the following updates:

[FSAV_Database_Version]

Version = 2007-03-29_02.
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F-Secure Corporation

Last Modified: March 29, 2007