Analysis by: Nikko Tamana
 PLATFORM:

Windows 2000, Windows Server 2003, Windows XP (32-bit, 64-bit), Windows Vista (32-bit, 64-bit), Windows 7 (32-bit, 64-bit)

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users. It 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: 40,448 bytes
File Type: EXE
Initial Samples Received Date: 14 May 2013

Arrival Details

This backdoor arrives as an attachment to email messages spammed by other malware/grayware or malicious users.

It 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%\Local Settings\upnphost.exe

(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 and 7.)

It drops the following file(s)/component(s):

  • {Malware Path}\tmp.bat
  • %User Temp%\~{random characters}.reg

(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 and 7.)

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://{BLOCKED}.{BLOCKED}.75.244:443/default.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.75.244:443/index.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.75.244:443/login.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.75.244:443/page.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.75.244:443/process.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.75.244:443/query.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.75.244:443/query.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.74.105:443/default.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.74.105:443/index.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.74.105:443/login.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.74.105:443/page.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.74.105:443/parse.jsp?{two letters}={values}
  • http://{BLOCKED}.{BLOCKED}.74.105:443/user.jsp?{two letters}={values}