Analysis by: John Anthony Banes
ALIASES:

Trojan:Java/Adwind.P (Microsoft); Backdoor.Adwind!g1 (Norton); Java/Adwind.RB trojan (NOD32)

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 225,844 bytes
File Type: JAR
Initial Samples Received Date: 23 Aug 2018

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 copies of itself into the affected system and executes them:

  • %User Profile%\{random folder name 2}\{random file name 1}.{random file extension}

(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 drops the following files:

  • %User Profile%\{random folder name 1}\{random file name 3}
  • %User Profile%\{random folder name 1}\ID.txt
  • %User Profile%\{random folder name 2}\ID.txt
  • %User Profile%\{random folder name 2}\{random file name 4}
  • %System%\test.txt
  • %Application Data%\Oracle\{copies of files under Java Installation folder}

(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.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %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.)

It creates the following folders:

  • %User Profile%\{random folder name 1}
  • %User Profile%\{random folder name 2}
  • %Application Data%\Oracle

(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.. %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.)

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
{random} = ""%Application Data%\Oracle\bin\javaw.exe" -jar "%User Profile%\{random folder name 2}\{random file name 1}.{random file extension}""

Other Details

This Backdoor connects to the following possibly malicious URL:

  • {BLOCKED}ee.ddns.net