TROJ_YAKES.U

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

However, as of this writing, the said sites are inaccessible. It deletes the initially executed copy of itself.

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Installation

This Trojan drops the following copies of itself into the affected system:

• %User Temp%\{malware name}.exe

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, XP, and Server 2003.)

It terminates the execution of the copy it initially executed and executes the copy it drops instead.

Autostart Technique

This Trojan adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
PID = "%User Temp%\{malware name}.exe"

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}ran.ru/forum/dl/ots.php?seller=4&hash={B6E17DE2-5E36-4D21-829D-299C5A289CFB}
• http://{BLOCKED}ran.ru/forum/dl/getapp.php?seller=4&hash={B6E17DE2-5E36-4D21-829D-299C5A289CFB}
• http://{BLOCKED}ran.ru/forum/dl/getapp.php?seller=4&hash={B6E17DE2-5E36-4D21-829D-299C5A289CFB}

It attempts to access the following websites to download files, which are possibly malicious:

• http://www.{BLOCKED}ndmllllahdi.ru/php/build.exe
• http://www.{BLOCKED}ndmllllahdi.ru/php/soft.exe

However, as of this writing, the said sites are inaccessible.

It deletes the initially executed copy of itself