Backdoor.Java.ADWIND.THBABAI

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.

It executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

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:

• %User Temp%\_.0{Random Numbers}.class
• %User Temp%\hsperfdata_{username}\{process ID} -> contains details of the malware
• %ProgramData%\Oracle\Java\.oracle_jre_usage\17dfc292991c7c81.timestamp -> time usage of oracle
• %User Temp%\Retrive{random numbers}.vbs -> script to detect installed AV security and Firewall products (deleted after execution)
• %User Profile%\fUTkALeaTxM\ID.txt -> contains UUID
• %System%\test.txt -> used to check for admin rights

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, and 8.. %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData in Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

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

• %User Profile%\{Random Characters}\{11 Random Characters}.{6 Random Characters}

(Note: %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.)

It adds the following processes:

• xcopy "%Program Files%\Java\jre{version}" "%Application Data%\Oracle\" /e -> copy files and directory trees of Java Installation folder to %Application Data%\Oracle folder
• attrib +h "%User Profile%\{random characters}\*.*" -> set attribute of all files under the folder to hidden
• attrib +h "%User Profile%\{random characters}" -> set attribute of folder to hidden

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.)

It creates the following folders:

• %Application Data%\Oracle
• %User Profile%\fUTkALeaTxM
• %User Profile%\{Random Characters}

(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, XP, and Server 2003, or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, and 8.. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000, XP, and Server 2003, or C:\Users\{user name} on Windows Vista, 7, and 8.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{11 Random Characters} = "%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\{Random Characters}\{11 Random Characters}.{6 Random Characters}"

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

• copy arbitrary files
• read arbitrary files
• run arbitrary files
• run arbitrary jar files
• run arbitrary shell commands
• sleep command
• queries arbitrary registry entries
• change the owner and permissions of the user folder for unix related OS
• creation of vbs script
• execute created scripts

It connects to the following websites to send and receive information:

• {BLOCKED}g.{BLOCKED}r.me:3011

Other Details

This Backdoor does the following:

• Checks for the existence of /usr/bin/xdg-open or /usr/bin/open for non-jar unix related files.