RANSOM_HPCRYPTESLA.SMA3

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 deletes itself after execution.

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 and executes them:

• %User Profile%\Documents\{random filename}.exe

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

It drops and executes the following files:

• %Desktop%\-!RecOveR!-{random 5 characters}++.Png
• %Desktop%\-!RecOveR!-{random 5 characters}++.Txt
• %Desktop%\-!RecOveR!-{random 5 characters}++.Htm

(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.)

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
{random} = C:\WINDOWS\SYSTEM32\CMD.EXE /C START "" "%Uses Profile%\Documents\{random filename}.exe"

Dropping Routine

This Trojan drops the following files:

• %User Profile%\Documents\-!recover!-!file!-.txt
• %User Profile%\Documents\desctop._ini
• {folders containing encrypted files}\-!RecOveR!-{random 5 characters}++.Png
• {folders containing encrypted files}\-!RecOveR!-{random 5 characters}++.Txt
• {folders containing encrypted files}\-!RecOveR!-{random 5 characters}++.Htm

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista and 7.)

Other Details

This Trojan connects to the following possibly malicious URL:

• http://{BLOCKED}ightwithmysite.com/sys_info.php
• http://{BLOCKED}l.com/sys_init.php
• http://{BLOCKED}rimbebeautiful.com.au/sys_init.php
• http://{BLOCKED}eriedelareine.fr/sys_init.php
• http://{BLOCKED}eambd.com/inifile.php
• http://{BLOCKED}eambd.com/wp-admin/setup-config.php
• http://{BLOCKED}o.com/inifile.php

It deletes itself after execution.