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WORM_PRONNY.JDN

June 14, 2014
 Analysis by: Mark Joseph Manahan
 ALIASES:

Mal/VB-ALW (Sophos) ,Win32/Pronny.LZ worm (Eset)

 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:
 INFORMATION EXPOSURE:

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

This worm arrives by connecting affected removable drives to a system. It arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

  TECHNICAL DETAILS

File Size:

143,360 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

08 Jun 2014

Arrival Details

This worm arrives by connecting affected removable drives to a system.

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 worm drops the following files:

  • {removable drive letter}:\movies.lnk
  • {removable drive letter}:\music.lnk
  • {removable drive letter}:\favourites.lnk
  • {removable drive letter}:\passwords.lnk
  • {removable drive letter}:\pictures.lnk
  • {removable drive letter}:\private.lnk
  • {removable drive letter}:\search.lnk
  • {removable drive letter}:\secret folder.lnk

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

  • %User Profile%\{random foldername}\{random file name}.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.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{random file name} = "%User Profile%\{random foldername}\{random file name}.exe /{random char}"

Other System Modifications

This worm modifies the following registry entries to hide files with Hidden attributes:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = "0"

Propagation

This worm drops the following copy(ies) of itself in all removable drives:

  • {drive letter}:\i love you.exe
  • {drive letter}:\naked.exe
  • {drive letter}:\password.exe
  • {drive letter}:\sexy.exe
  • {drive letter}:\webcam.exe
  • {drive letter}:\{random filename}.exe

It drops an AUTORUN.INF file to automatically execute the copies it drops when a user accesses the drives of an affected system.

Other Details

This worm connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.114.0
  • {BLOCKED}.{BLOCKED}.117.0
  • {BLOCKED}.{BLOCKED}.66.0
  • {BLOCKED}.{BLOCKED}.190.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.113.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.138.0
  • {BLOCKED}.{BLOCKED}.20.0
  • {BLOCKED}.{BLOCKED}.216.0
  • {BLOCKED}.{BLOCKED}.72.121
  • {BLOCKED}.{BLOCKED}.237.0
  • {BLOCKED}.{BLOCKED}.55.0
  • {BLOCKED}.{BLOCKED}.222.0
  • {BLOCKED}.{BLOCKED}.169.0
  • {BLOCKED}.{BLOCKED}.117.0
  • {BLOCKED}.{BLOCKED}.116.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.71.0
  • {BLOCKED}.{BLOCKED}.149.0
  • {BLOCKED}.{BLOCKED}.221.0
  • {BLOCKED}.{BLOCKED}.103.0
  • {BLOCKED}.{BLOCKED}.32.21
  • {BLOCKED}.{BLOCKED}.34.21
  • {BLOCKED}.{BLOCKED}.36.21
  • {BLOCKED}.{BLOCKED}.38.21
  • {BLOCKED}.{BLOCKED}.68.0
  • {BLOCKED}.{BLOCKED}.98.0
  • {BLOCKED}.{BLOCKED}.168.0
  • {BLOCKED}.{BLOCKED}.136.0
  • {BLOCKED}.{BLOCKED}.210.0
  • {BLOCKED}.{BLOCKED}.58.0
  • {BLOCKED}.{BLOCKED}.62.0
  • {BLOCKED}.{BLOCKED}.66.0
  • {BLOCKED}.{BLOCKED}.67.0
  • {BLOCKED}.{BLOCKED}.93.201
  • {BLOCKED}.{BLOCKED}.125.0
  • {BLOCKED}.{BLOCKED}.100.0
  • {BLOCKED}.{BLOCKED}.73.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.0.0
  • {BLOCKED}.{BLOCKED}.112.0
  • {BLOCKED}.{BLOCKED}.67.100
  • {BLOCKED}.{BLOCKED}.34.46
  • {BLOCKED}.{BLOCKED}.245.0
  • {BLOCKED}.{BLOCKED}.120.0
  • {BLOCKED}.{BLOCKED}.41.0
  • {BLOCKED}.{BLOCKED}.43.0
  • {BLOCKED}.{BLOCKED}.44.0
  • {BLOCKED}.{BLOCKED}.183.0
  • {BLOCKED}.{BLOCKED}.169.0
  • {BLOCKED}.{BLOCKED}.174.0
  • {BLOCKED}.{BLOCKED}.197.0
  • {BLOCKED].{BLOCKED}.58.0
  • {BLOCKED].{BLOCKED}.72.0
  • {BLOCKED}.{BLOCKED}.143.0
  • {BLOCKED}.{BLOCKED}.166.0
  • {BLOCKED}.{BLOCKED}.167.0
  • {BLOCKED}.{BLOCKED}.230.0
  • {BLOCKED}.{BLOCKED}.13.0
  • {BLOCKED}.{BLOCKED}.236.0
  • {BLOCKED}.{BLOCKED}.139.0
  • {BLOCKED}.{BLOCKED}.196.0
  • {BLOCKED}.{BLOCKED}.85.0