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TSPY_PAPRAS.EN

August 15, 2014
 Analysis by: Vincent Martin Hermosura
 ALIASES:

Trojan-Spy.Win32.Zbot.tsuh (Kaspersky), Trojan:Win32/Malagent!gmb (Microsoft), Trojan.Win32.Generic.pak!cobra (Sunbelt), TR/Dropper.VB.14976 (Antivir), Trojan.GenericKD.1796977 (Bitdefender), W32/Zbot.TSUH!tr (Fortinet), Trojan-Spy.Win32.Zbot (Ikarus), Win32/PSW.Papras.CK trojan (Esset)

 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: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


This Trojan 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:

602112 bytes

File Type:

EXE

Initial Samples Received Date:

12 Aug 2014

Arrival Details

This Trojan 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 Trojan drops the following copies of itself into the affected system:

  • %Application Data%\{GUID}\{random 1}.exe

(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 and 7.)

It drops the following files:

  • %Application Data%\{GUID}\{random 2}.dat
  • %Application Data%\{GUID}\{random 3}
  • %Application Data%\{GUID}\{random 4}.dat
  • %Application Data%\{GUID}\{random 5}

(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 and 7.)

It creates the following folders:

  • %Application Data%\{GUID}

(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 and 7.)

Autostart Technique

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

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
{GUID} = "%Application Data%\{GUID}\{random 1}.exe"