Trojan-Spy:W32/Small.BSL
Summary
Trojan-Spy applications are usually standalone programs that allow malicious individuals to monitor activity on infected computers. Trojan-Spy:Win32.Small.BSL installs a component designed to steal installed certificates.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
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Technical Details
Creates the following registry entries:
- HKEY_CLASSES_ROOT\CLSID\{BD942DA7-96C8-4342-84C6-E2BCFE69FE11}\InprocServer32 (Default) = "C:\WINDOWS\system32\acrobat.dll" ThreadingModel = "Apartment" (Using the name, Adobe Acrobat ActiveX Control)
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion \Explorer\Browser Helper Objects\{BD942DA7-96C8-4342-84C6-E2BCFE69FE11} NoExplorer = 0x00000001 (1)
- HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run Adobe Acrobat ActiveX Control = "Rundll32 acrobat.dll,AInit"
It attempts to create the following registry entry:
- HKEY_LOCAL_MACHINE\Software\Acrobat\ "1" = "124.217.251.118" "2" = 0x00000050 (80) "3" = /NNN/parse.php
It then drops a file into the following folder:
- %windir%\system32\
The dropped file is called acrobat.dll and is 51712 bytes in size.The malware sets acrobat.dll with a hidden file attribute and changes its date properties to the current system time.Small.BSL then displays the following fake/decoy dialog message:
When the dialog box is closed the malware will search for and terminate all running Internet Explorer processes. After this, it will launch Internet Explorer as a hidden process which has the malicious component attached.This malicious component acts like a Browser Helper Object (BHO).After the user has started Internet Explorer the malware will attempt to communicate with a server located at the following URL:
- http://124.217.[REMOVED]/NNN/parse.php
The BHO has the following functionality:
- Steals installed certificates
- Deletes user cookie files
- Updates itself
- Deletes files from C:\Documents and Settings \%username%\Application Data\Macromedia\Flash Player\
- Updates registry information
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