Bindjpg

Overview

Executive Summary

Technical Architecture and Exploitation

• Steganography (Data Hiding): The attacker uses a "binder" tool to append a malicious executable (e.g., a `.exe` or `.dll`) to the end of a legitimate image file, or hides the code within the image's EXIF metadata. A secondary script or dropper (often downloaded via a macro in an Office document) is required to extract and execute the hidden payload from the image.
• Image-Parsing Exploits: The `.jpg` file is intentionally malformed to exploit a buffer overflow or integer overflow vulnerability within a specific image viewer (like older versions of Windows Photo Viewer or standard GDI+ libraries). Simply opening the image, or having Windows generate a thumbnail for it, triggers the exploit and executes the embedded shellcode.

Threat Impact

Incident Response and Mitigation

• Patching and Updates: Image-parsing exploits rely on outdated software. Ensure that the operating system and all image-handling applications (including web browsers and office suites) are fully patched against known GDI/image processing vulnerabilities.
• EDR Behavioral Monitoring: Because the `.jpg` file itself may pass static scanning, defenses must rely on EDR to monitor for anomalous process behavior. For example, an image viewer application (like `mspaint.exe` or `photos.exe`) unexpectedly spawning a command shell (`cmd.exe`) or establishing an outbound network connection is a clear indicator of compromise.
• File Dissection: During incident response, utilize steganography analysis tools to extract the hidden payload from the suspect image file for further analysis and IOC generation.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan.BindJPG
• Exploit.Win32.BindJPG
• Trojan-Dropper.Win32.Bind

MITRE ATT&CK Techniques

This family has been observed using the following ATT&CK techniques: T1027.003 T1204.002 T1059

Tactical Mitigations

Based on the techniques used by this family, consider the following defensive strategies:

• T1059: Restrict execution of scripting languages such as PowerShell, VBScript, or Python to authorized administrators. Enforce Script Block Logging.

Generated Detections (Boilerplate)

These YARA and Sigma rules are auto-generated based on the family name and aliases. They must be heavily tuned before deployment in a production environment.

YARA Rule

rule MALWARE_WIN_BINDJPG {
    meta:
        description = "Detects Bindjpg (trojan)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "bindjpg" ascii wide nocase
        $s2 = "trojan.bindjpg" ascii wide nocase
        $s3 = "exploit.win32.bindjpg" ascii wide nocase
        $s4 = "trojan-dropper.win32.bind" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Bindjpg Activity
id: f33119395a7ffc69b23142b9885207a9
status: experimental
description: Detects generic indicators of the bindjpg malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*bindjpg*"
            - "*trojan.bindjpg*"
            - "*exploit.win32.bindjpg*"
            - "*trojan-dropper.win32.bind*"
    condition: selection
level: medium

References & External Analysis

• Search "bindjpg" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: trojan)

Explore other malware families in the same category:

• Comproc
• Vitro
• Codecpa
• Xxybvi
• Gtbot

Machine-readable

Get this profile as JSON: https://jordanricky1604-ship-it.github.io/malware-families-catalog/api/bindjpg.json

Ecosystem & Interactive Environments

This profile is part of the Malware Families Catalog, a public dataset of 2,899 malware families. The catalog is also published across our ecosystem: Hugging Face, Kaggle, Zenodo, Replit, StackBlitz, CodeSandbox, and CodePen.