RANSOM_CRYPICH.D

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 modifies the Internet Explorer Zone Settings.

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:

• %Program Files%\1C\{malware file name}.{malware file extension}
• %User Temp%\1C\{malware file name}.{malware file extension}

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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.)

It drops the following files:

• %Program Files%\1C\{random filename}.(random file extension}
• %User Temp%\1C\desk.bmp
• %User Temp%\1C\desk.jpg

(Note: %Program Files% is the Program Files folder, where it usually is C:\Program Files on all Windows operating system versions; C:\Program Files (x86) for 32-bit applications running on Windows 64-bit operating systems.. %User Temp% is the user's temporary folder, where it usually is C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000, Windows Server 2003, and Windows XP (32- and 64-bit); C:\Users\{user name}\AppData\Local\Temp on 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_LOCAL_MACHINE\Software\Microsoft\
Windows\CurrentVersion\Run
pr = "%Program Files%\1C\{malware file name}.{malware file extension}"

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_LOCAL_MACHINE\Control Panel\Desktop
TileWallpaper = "0"

(Note: The default value data of the said registry entry is "{User Preference}".)

HKEY_LOCAL_MACHINE\Control Panel\Desktop
Wallpaper = "%User Temp%\1C\desk.bmp"

(Note: The default value data of the said registry entry is "{User Preference}".)

Web Browser Home Page and Search Page Modification

This Trojan modifies the Internet Explorer Zone Settings.

Other Details

This Trojan connects to the following possibly malicious URL:

• http://www.{BLOCKED}mydata.co.uk/pwksfmaw/install/inst.php?vers=CL%201.2.0.0&id={value}-{time stamp}{value}&sender=ai

It renames encrypted files using the following names:

• email-{BLOCKED}ivanov34@aol.com.ver-CL 1.2.0.0.id-{value}-{time stamp}{value}.randomname-{value}.cbf

NOTES:

This malware is capable of encrypting files in the affected system.