RANSOM_CRYSIS.F117BL

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 drops copies of itself in the Windows Common Startup folder to enable its automatic execution at every system startup.

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 copies of itself into the affected system:

• %System%\{malware filename}

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

It adds the following processes:

• mode con cp select=1251
• vssadmin delete shadows /all /quiet

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Run
{malware filename} = "%System%\{malware filename}"

It drops copies of itself in the Windows Common Startup folder to enable its automatic execution at every system startup.

Other Details

This Trojan renames encrypted files using the following names:

• {filename with extension of the encrypted file}.id-{assigned ID}.[amanda_sofost@india.com].wallet

It is capable of encrypting files in the affected system.