TrojanSpy.Win32.FORMBOOK.NLJ

 Analysis by: Neljorn Nathaniel Aguas

 ALIASES:

Trojan:Win32/SuspPEInArcEmail.A (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Trojan Spy

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


This Trojan Spy arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.

  TECHNICAL DETAILS

File Size:

856,075 bytes

File Type:

ZIP

Initial Samples Received Date:

31 Jul 2024

Payload:

Drops files

Arrival Details

This Trojan Spy 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 Spy drops the following files:

  • %User Temp%\autB655.tmp
  • %User Temp%\autB7AD.tmp
  • %User Temp%\prophetesses
  • %User Temp%\definitization

(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(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • %System%\svchost.exe {Malware Path}\{Malware Filename}

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

Other Details

This Trojan Spy does the following:

  • This is a ZIP file containing a malicious executable upon extraction.

It requires being executed with a specific argument/parameter, an additional component, or in a specific environment in order to proceed with its intended routine.