Webbrowserpassview

Category: trojan · Aliases: HackTool.WebBrowserPassView, Riskware.PasswordRevealer, Win32/WebBrowserPassView · Sample count (EMBER 2018): 1 · Enrichment: insufficient_information · Updated: 2026-07-02T07:12:52Z

Category: TrojanActor: Unknown / CybercriminalIndustry: Global / OpportunisticMotivation: Opportunistic

Overview

Executive Summary

WebBrowserPassView is a legitimate password recovery utility created by NirSoft. It is designed to extract and display all passwords stored within the local credential databases of major web browsers (Chrome, Firefox, Edge, Opera). However, because of its powerful capability to instantly reveal plaintext credentials without requiring administrative privileges, it is frequently flagged by security software as a "HackTool" or "Riskware." Threat actors routinely weaponize this utility, dropping it onto compromised systems to quickly harvest all saved passwords.

Infection Vector and Technical Capabilities

WebBrowserPassView is not a virus and does not self-propagate. In a malicious context, it is typically dropped onto a machine by a primary Trojan (like an Emotet or Trickbot loader) or executed manually by an attacker during a post-exploitation, lateral movement phase. Its technical execution is straightforward and highly effective:

Direct Database Parsing: The tool does not rely on keylogging or memory scraping. Instead, it directly locates the specific SQLite databases and encrypted credential files used by each supported browser (e.g., Chrome's `Login Data` file).
On-the-Fly Decryption: It utilizes the current logged-in user's context (specifically the Windows Data Protection API - DPAPI) to automatically decrypt the stored passwords instantly, displaying them in plaintext.
Command Line Automation: Attackers utilize the tool's built-in command-line arguments (e.g., `/shtml`, `/stext`) to execute it silently in the background, instantly dumping all harvested credentials into a hidden text file for exfiltration, entirely bypassing the graphical interface.

Threat Assessment

The unauthorized presence of WebBrowserPassView on a corporate endpoint is a critical security incident. It indicates that an attacker has gained sufficient access to execute arbitrary code and is actively engaged in credential harvesting. The theft of browser-stored passwords often grants the attacker immediate access to corporate web applications, VPN portals, and cloud infrastructure.

Incident Response and Remediation

Contextual Verification: First, determine if the tool was executed legitimately by an IT administrator assisting a user with password recovery (though this practice is strongly discouraged in enterprise environments).
Assume Total Credential Compromise: If the execution was unauthorized, you must assume *all* passwords stored in the user's web browsers have been compromised.
Mandatory Credential Reset: Initiate an immediate, mandatory reset of all enterprise passwords associated with that user. Advise the user to reset all personal passwords (banking, social media) that may have been stored in their corporate browser profile.
Investigate the Source: Determine how the tool was delivered to the endpoint (e.g., look for an associated dropper trojan or signs of a compromised RDP session).

Known aliases

Threat reports may refer to this family under multiple names:

MITRE ATT&CK Techniques

This family has been observed using the following ATT&CK techniques: T1555.003 T1059 T1003

Tactical Mitigations

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

T1003: Monitor for LSASS memory dumping or registry SAM extraction. Enable Credential Guard on Windows systems.
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_WEBBROWSERPASSVIEW {
    meta:
        description = "Detects Webbrowserpassview (trojan)"
        author = "SystemHelpdesk Boilerplate Generator"
        date = "2026-07-06"
    strings:
        $s1 = "webbrowserpassview" ascii wide nocase
        $s2 = "hacktool.webbrowserpassview" ascii wide nocase
        $s3 = "riskware.passwordrevealer" ascii wide nocase
        $s4 = "win32/webbrowserpassview" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

Sigma Rule

title: Suspicious Webbrowserpassview Activity
id: e25222cf64510e32ba07f03d70dc4b93
status: experimental
description: Detects generic indicators of the webbrowserpassview malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*webbrowserpassview*"
            - "*hacktool.webbrowserpassview*"
            - "*riskware.passwordrevealer*"
            - "*win32/webbrowserpassview*"
    condition: selection
level: medium

References & External Analysis

Search "webbrowserpassview" on VirusTotal (External Analysis)

Frequently Asked Questions

How do I remove the Webbrowserpassview Trojan from Windows?

Manual removal of Webbrowserpassview is highly discouraged as it may leave persistence mechanisms intact. We recommend disconnecting the device from the internet and utilizing a professional incident response service or enterprise-grade EDR software to conduct a full forensic sweep.

Is Webbrowserpassview a virus or a Trojan?

Webbrowserpassview is classified as a Trojan. Unlike traditional viruses that infect files, modern malware like Webbrowserpassview typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.

What are the main symptoms of a Webbrowserpassview infection?

Symptoms of Webbrowserpassview can include unexpected system slowness, unauthorized outbound network traffic to unknown IP addresses, disabled security software, and suspicious background processes running from AppData or Temp directories.

Related Families (Category: trojan)

Explore other malware families in the same category:

Protect Your Network Against Trojans

Want to prevent Webbrowserpassview and similar threats from compromising your organization? Read our comprehensive defensive guide: Banking Trojan Protection.

Need help with an active incident? Published by the SystemHelpdesk team.

Machine-readable

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