Trojan.Win64.KIMSUKY.C

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 uses Windows Task Scheduler to create a scheduled task that executes the dropped copy. It executes then deletes itself afterward.

As of this writing, the said sites are inaccessible.

It connects to certain websites to send and receive information.

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 adds the following folders:

• %Application Data%\Microsoft\Windows\Defender
• %Application Data%\Microsoft\Windows
• %Application Data%\Microsoft

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

It drops the following copies of itself into the affected system:

• %Application Data%\Microsoft\Windows\Defender\AutoUpdate.dll

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

It drops the following files:

• %User Temp%\{random temp}.tmp.bat -> contains batch command to delete self

(Note: %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 adds the following processes:

• schtasks /create /sc minute /mo 15 /tn "WindowsDefender Virus & Threat Protection Maintenance" /tr "regsvr32.exe /s \"%Application Data%\Microsoft\Windows\Defender\AutoUpdate.dll\"" /f
• "%User Temp%\{random temp}.tmp.bat"

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming 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 uses Windows Task Scheduler to create a scheduled task that executes the dropped copy.

It executes then deletes itself afterward.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

• IMPOSSIBLE-2

It injects itself into the following processes as part of its memory residency routine:

• explorer.exe

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

• http://suzuki.{BLOCKED}ore.pe.hu/?m=c&p1={generated ID from gathered information}&p1={generated ID from gathered information}

It saves the files it downloads using the following names:

• %User Temp%\{random temp string}.tmp

(Note: %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).)

As of this writing, the said sites are inaccessible.

Information Theft

This Trojan gathers the following data:

• Operating System
• System Architecture
• Adapters Information
• Volume Information

Other Details

This Trojan connects to the following website to send and receive information:

• http://suzuki.{BLOCKED}ore.pe.hu/?m=a&p1={generated ID from gathered information}&p2={windowsVersion and systemArchitecture}_DROPPER
• http://suzuki.{BLOCKED}ore.pe.hu/?m=d&p1={generated ID from gathered information}

It adds the following scheduled tasks:

• Task Name: WindowsDefender Virus & Threat Protection Maintenance
• Binary Path: "regsvr32.exe /s \"%Application Data%\Microsoft\Windows\Defender\AutoUpdate.dll\"" /f

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