Backdoor.Win64.SNIPBOT.THIBFBD

This Backdoor 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 Backdoor 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 Backdoor drops the following files:

• keyprov.dll
• single.dll
• %AppDataLocal%/temp.cmd

(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).)

It adds the following processes:

• %AppDataLocal%temp.cmd %AppDataLocal%\Local\KeyStore
• cmd /C taskkill /f /im explorer.exe && start explorer.exe → restart Explorer

(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).)

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

• SnipMutex

Other System Modifications

This Backdoor adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\SOFTWARE\AppDataHigh\
Software
state1 = single.dll

Backdoor Routine

This Backdoor connects to the following URL(s) to send and receive commands from a remote malicious user:

• {BLOCKED}eapi.com

Information Theft

This Backdoor gathers the following data:

• Computer / Domain name
• MAC address
• Windows build number
• If Windows server

Other Details

This Backdoor adds the following lines or registry entries as part of its routine:

• HKEY_Current_User\SOFTWARE\AppDataHigh\Software
• HKEY_Current_User\SOFTWARE\AppDataHigh
• HKEY_Current_User\SOFTWARE\Classes\CLSID\{SID}\InprocServer32

It does the following:

• It connects to the C2 server to download earlier versions of the following payloads and inject it into Explorer:
  • keyprov.dll
  • single.dll
• It decrypts and execute the DLL payloads downloaded from the C2 server.
• It listens on port 1342 for the following incoming string commands sent over TCP.