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

Tamaño del archivo 40,448 bytes
Tipo de archivo EXE
Fecha de recepción de las muestras iniciales 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}