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This ransomware was spread via a compromised website of a well-known confectionery company based in France, Laduree.
To get a one-glance comprehensive view of the behavior of this Trojan, refer to the Threat Diagram shown below.
Upon execution, this Trojan connects to a certain site to get the IP address, geographical location, city, and Internet Service Provider (ISP) of the affected system. It then blocks the desktop of the user and displays an image. The image accuses the user of violating the laws of France for several fabricated offenses. It then demands users to pay a fine via Ukash or Paysafecard voucher.
This Trojan may be unknowingly downloaded by a user while visiting malicious websites.
This Trojan drops the following copies of itself into the affected system:
(Note: %Windows% is the Windows folder, which is usually C:\Windows or C:\WINNT.. %System% is the Windows system folder, which is usually C:\Windows\System on Windows 98 and ME, C:\WINNT\System32 on Windows NT and 2000, or C:\Windows\System32 on Windows XP and Server 2003.)
This Trojan terminates the following processes if found running in the affected system's memory:
Upon execution, it connects to the following site to get the IP address, geographical location, city, and Internet Service Provider (ISP) of the affected system:
It then blocks the desktop of the user and displays the following image:
The image above accuses the user of violating the laws of France for several fabricated offenses. It then demands users to pay a fine via Ukash or Paysafecard voucher.
It reports system infection to any of the following sites:
It saves the original explorer.exe file as follows:
For Windows XP and Windows Server 2003 users, before doing any scans, please make sure you disable System Restore to allow full scanning of your computer.
Scan your computer with your Trend Micro product to delete files detected as TROJ_RANSOM.BOV. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.
Do as Step 2:
To identify and delete the malware/grayware file:
copy %Windows%\twexx32.dll %Windows%\explorer.exe
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