Snipr

Overview

HackTool:Win32/Snipr is a classification for malicious tools specifically designed to automate 'Credential Stuffing' attacks. While not a virus that infects a host in the traditional sense, Snipr (and similar tools like SentryMBA or OpenBullet) are used by cybercriminals to take massive lists of leaked usernames and passwords from previous breaches and automatically test them against high-value targets like banking sites, streaming services, or corporate VPNs (`T1110.004`).

Understanding Snipr (Credential Stuffing)
To an end-user, they may suddenly find their Netflix or bank account compromised, even though they didn't click a phishing link (because they reused a password). For a SOC analyst, detecting Snipr on a corporate endpoint means an insider or an attacker who has already breached the perimeter is actively using the corporate network as a launchpad to conduct attacks against external (or internal) web applications.

Execution and Attack Mechanics
Snipr requires a 'combo list' (millions of `username:password` pairs) and a configuration file that tells the tool how to interact with the target website's login form. Upon execution, the attacker loads proxies (`T1090`) to distribute the login requests and hide their true IP address. Snipr then launches thousands of concurrent HTTP POST requests to the target login page (`T1110.004`). It analyzes the HTTP response codes or page text to determine if the login was successful, saving valid accounts to a 'hits' file.

Indicators of Compromise & Impact
The impact is the mass compromise of user accounts leading to fraud or unauthorized access. Host-based IoCs include the presence of the Snipr executable, large text files containing 'combo lists' (`username:password` pairs), and configuration files tailored to specific web applications. Network IoCs are highly visible if not proxied: a massive volume of outbound HTTP POST requests directed at a single URL (the login page of a target service), originating from the endpoint.

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to the MITRE ATT&CK framework:

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_SNIPR {
    meta:
        description = "Detects Snipr (advanced_threat)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "snipr" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Snipr Activity
id: 0a73eb4e74b5c39a58bf818ebad16b86
status: experimental
description: Detects generic indicators of the snipr malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*snipr*"
    condition: selection
level: medium

Containment & Response Steps

Ordered checklist for responders. Adapt to your environment and engage professional support for active incidents.

1. Terminate the Snipr process and isolate the machine to stop the outbound credential stuffing attack.
2. Investigate how the tool arrived on the system. If an employee downloaded it, treat it as a severe Acceptable Use Policy violation or insider threat.
3. If the tool was targeting *internal* corporate applications, immediately review the authentication logs for those apps to identify any successfully compromised accounts.
4. Ensure Multi-Factor Authentication (MFA) is strictly enforced on all external-facing corporate portals to neutralize the threat of credential stuffing.

What to Avoid

Common mistakes during response to this family that can destroy evidence, spread the infection, or worsen recovery.

1. Do not assume the user's local passwords are secure just because the machine was running Snipr; the tool itself is often bundled with malware.
2. Avoid allowing users to reuse corporate passwords on personal services.

References & External Analysis

• Search "snipr" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: advanced_threat)

Explore other malware families in the same category:

• Spywork
• 2345Cn
• Smallhttp
• Wpepro
• Adwapper

Machine-readable

Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/snipr.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.