RANSOM_LOCKY.DLDSAPL

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.

It is capable of encrypting files in the affected system.

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 files:

• {folder of encrypted files}\_{number of folders encrypted}_HOWDO_text.html

It drops and executes the following files:

• %Desktop%\_HOWDO_text.bmp
• %Desktop%\_HOWDO_text.html

(Note: %Desktop% is the desktop folder, where it usually is C:\Documents and Settings\{user name}\Desktop in Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\Desktop in Windows Vista (32- and 64-bit), Windows 7 (32- and 64-bit), Windows 8 (32- and 64-bit), Windows 8.1 (32- and 64-bit), Windows Server 2008, and Windows Server 2012.)

Other System Modifications

This Trojan adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Control Panel\Desktop
TileWallpaper = "0"

HKEY_CURRENT_USER\Control Panel\Desktop
WallpaperStyle = "0"

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = "%Desktop%\_HOWDO_text.bmp"

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}.{BLOCKED}.26.201/apache_handler.php
• http://{randomly generated domain}.{ru, info, biz, click, su, work, pl, org, pw, org}/apache_handler.php

It renames encrypted files using the following names:

• {unique ID per victim}-{identifier}.odin

It is capable of encrypting files in the affected system.