Ransom.Win32.STOP.AK

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

Arrival Details

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

• %appdatalocal%\58917308-1b1b-46ea-8ebd-8345f8dbc8ee\{malware file name}.exe

It adds the following processes:

• icacls "%AppDataLocal%\58917308-1b1b-46ea-8ebd-8345f8dbc8ee" /deny *S-1-1-0:(OI)(CI)(DE,DC)
• %User Temp%\{Malware FileName}.exe --Admin IsNotAutoStart IsNotTask

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It creates the following folders:

• %AppDataLocal%\58917308-1b1b-46ea-8ebd-8345f8dbc8ee

(Note: %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
SysHelper = %appdatalocal%\58917308-1b1b-46ea-8ebd-8345f8dbc8ee\{malware file name}.exe --AutoStart

Other System Modifications

This Ransomware deletes the following files:

• %Windows%\Tasks\Time Trigger Task.job
• %appdatalocal%\58917308-1b1b-46ea-8ebd-8345f8dbc8ee\{malware file name}.exe

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

Dropping Routine

This Ransomware drops the following files:

• %System%\Tasks\Time Trigger Task

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other Details

This Ransomware connects to the following possibly malicious URL:

• http://api.{BLOCKED}p.ua

This report is generated via an automated analysis system.