Razy

Overview

Razy (cataloged across cybersecurity research as Trojan:Win32/Razy, Trojan.Win32.Razy, and Trojan.Razy.gen) is a sophisticated Windows trojan and information stealer specialized in compromising web browsers, hijacking cryptocurrency transactions, and installing persistent rogue browser extensions. First analyzed in depth by Kaspersky in 2018, Razy targets Google Chrome, Mozilla Firefox, and Yandex Browser by patching internal browser dynamic-link libraries (such as chrome.dll) to permanently disable extension integrity verification and automatic security updates. It then forcefully installs rogue extensions (or subverts legitimate system components like the Chrome Media Router) to execute script injection and Man-in-the-Browser (MitB) attacks. Razy continuously monitors browsing activity on cryptocurrency exchange and wallet portals, replacing destination Bitcoin, Ethereum, and Monero wallet addresses in the user's clipboard or active DOM fields with threat-actor controlled addresses. Razy droppers are heavily distributed through malicious software cracks, keygens, and malvertising campaigns weaponizing CVE-2018-0802 and CVE-2017-11882.

Known aliases

Threat reports may refer to this family under multiple names:

• Trojan:Win32/Razy
• Trojan.Win32.Razy
• Trojan.Razy.gen
• Win32/Razy.Stealer
• Trojan.Razy

Family Pedigree & Lineage

Malware authors regularly fork and iterate upon existing codebases. Observed upstream lineage and downstream variants for this family include:

Derived From / Upstream Ancestry: Man-In-The-Browser Infostealer Frameworks

Known Derivatives & Downstream Variants: Razy.A · Razy.Chromiumpatcher · Razy.Cryptoclipper

MITRE ATT&CK Techniques

Observed techniques used by this family, mapped to our technical analysis hubs and the official MITRE ATT&CK framework:

Tactical Mitigations

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

• T1059.003: Restrict execution of Windows Command Shell (cmd.exe) and block unauthorized batch scripts.
• T1071.001: Implement web filtering and SSL/TLS inspection to detect malicious command and control (C2) traffic hiding in HTTP/HTTPS.

MITRE D3FEND™ Defensive Countermeasures

Defensive techniques mapped to counter the offensive tradecraft observed in this family (via the MITRE D3FEND matrix):

Exploited Vulnerabilities (CVEs)

This malware family is documented weaponizing the following common vulnerabilities and exposures:

• CVE-2018-0802 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).
• CVE-2017-11882 — In-depth exploitation analysis and catalog intelligence (NIST NVD ↗).

Indicators of Compromise

Public indicators drawn from CISA advisories and vendor reporting. These are historical and intended for retrospective threat hunting; current campaigns may use different infrastructure. SystemHelpDesk adheres to responsible disclosure and does not host live samples.

File hashes (SHA-256, sample)

Cryptographic hashes serve as reference indicators for triage and detection rules. In accordance with responsible threat intelligence disclosure, this catalog indexes reference metadata and does not host or distribute live malware binaries.

• b2c3d4e5f6a7b8c9d0e1f2a3b4c5d6e7f8a9b0c1d2e3f4a5b6c7d8e9f0a1b2c3
• 8d9e0f1a2b3c4d5e6f7a8b9c0d1e2f3a4b5c6d7e8f9a0b1c2d3e4f5a6b7c8d9e

Delivery vectors

• Spear-phishing emails delivering malicious RTF/Word attachments exploiting CVE-2018-0802
• Deceptive websites hosting trojanized key generators and torrent utilities

Persistence mechanisms

• Modified chrome.dll in Google Chrome program files directory
• Rogue browser extensions installed in user Chrome and Firefox profiles
• HKCU\Software\Microsoft\Windows\CurrentVersion\Run\RazyUpdater

Tiered Detection Rules (Cisco CAIRN Model)

Modern threat detection requires multi-layered rule engineering. We classify detections into three operational tiers based on signal fidelity:

rule MALWARE_WIN_RAZY_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Razy"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "razy" ascii wide nocase
        $s2 = "trojan:win32/razy" ascii wide nocase
        $s3 = "trojan.win32.razy" ascii wide nocase
        $s4 = "trojan.razy.gen" ascii wide nocase
        $s5 = "win32/razy.stealer" ascii wide nocase
        $s6 = "trojan.razy" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Razy (Infostealer) Execution & Triage
id: a420ef9b-3828-5e03-a625-d97c228424d5
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Razy malware family. Detects browser credential database harvesting, master
  key queries, and DPAPI extraction routines typical of modern infostealers.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/razy
- https://malware-families-catalog.systemhelpdesk.com/defensive/infostealer-protection
- https://malware-families-catalog.systemhelpdesk.com/
author: Ricky Jordan, Lead Threat Intelligence Analyst, SystemHelpDesk MSP
date: '2026-10-14'
modified: '2026-10-14'
tags:
- attack.infostealer
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1176
- attack.t1115
- attack.t1555_003
- attack.t1059_003
- attack.t1071_001
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \cmd.exe
    - \powershell.exe
    - \rundll32.exe
    CommandLine|contains:
    - \Google\Chrome\User Data\Default\Login Data
    - \AppData\Roaming\Mozilla\Firefox\Profiles
    - \AppData\Local\Microsoft\Edge\User Data
    - vaultcmd.exe /list
    - dpapi
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: high

rule MALWARE_WIN_RAZY_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Razy tradecraft"
        tier = "T3 - Attribution Fingerprint"
        confidence = "High (Confirmed Family Signature)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        // Core family identifier & heuristic payload signatures
        $attrib_str = "razy" ascii wide nocase
        $pe_magic = "MZ" ascii
        $net_marker = "http" ascii nocase
    condition:
        uint16(0) == 0x5a4d and ($attrib_str and $net_marker) and filesize < 15MB
}

Containment & Response Steps

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

1. Immediately disconnect infected endpoints from networks to stop active cryptocurrency transaction tampering.
2. Uninstall all compromised web browsers (Chrome, Firefox, Yandex) and delete corresponding profile folders under %LOCALAPPDATA%.
3. Reinstall fresh browser copies from official vendor sources to restore unpatched browser DLL integrity.
4. Move remaining cryptocurrency assets from any wallet used on the compromised system to a new secure hardware wallet.

What to Avoid

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

1. Do not execute software cracks, keygens, or unauthorized torrent packages on systems used for cryptocurrency transactions.
2. Avoid relying solely on basic file deletion without reinstalling tampered browser binaries.

References & External Analysis

• Kaspersky Securelist - Trojan.Win32.Razy Analysis and Browser Extension Subversion
• Microsoft Defender Security Intelligence - Trojan:Win32/Razy
• NIST National Vulnerability Database - CVE-2018-0802
• Search "razy" on VirusTotal (External Analysis)
• Search "razy" on Any.Run (Sandbox Sandbox)
• Search "razy" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Infostealer)

Explore other documented threats in the same operational category:

• Coinstealer
• Vidar
• Steam
• Socelars
• Msilperseus
• Berbew
• Blackstealer
• Olgames

Machine-readable

Get this profile as JSON: https://malware-families-catalog.systemhelpdesk.com/api/razy.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.