TROJ_DROPPER.THFBFAI

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.

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 files:

• %System Root%\$Recycle.Bin\S-1-3
• %System Root%\Users\Public\Documents\{GUID}
• %Temp%\{GUID}
• %User Temp%\{GUID}
• {malware path}\WNetworkMgmt2008.exe
• {malware path}\config.ini
• {malware path}\svc_client.exe.old.bak-

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

Other System Modifications

This Trojan adds the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt

It adds the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Interval = {date}

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Oem = unknown

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Tm = {number}

HKEY_LOCAL_MACHINE\SOFTWARE\NetworkMgmt
Uid = {hex string}

Other Details

This Trojan connects to the following possibly malicious URL:

• service.{BLOCKED}.com
• admin.{BLOCKED}.com