Rapid

Overview

Ransomware:Win32/Rapid is a devastating crypto-ransomware family designed to completely halt business operations by encrypting critical user and system files. Highly active in targeted attacks, Rapid is characterized by its speed of encryption and its aggressive mechanisms for disabling system recovery options before dropping its ransom demand.

Understanding Rapid
To the victim, a Rapid infection is a catastrophic event. Suddenly, all files are inaccessible, their extensions are changed (often to `.rapid`), and a ransom note (typically a `.txt` or `.html` file) is left on the desktop demanding cryptocurrency payment. For incident responders, Rapid signifies a severe failure in endpoint defenses or a compromised perimeter. Unlike stealthy espionage tools, Rapid's objective is loud, immediate, and destructive impact, relying on strong, unbreakable cryptography (typically AES combined with RSA) to lock the data.

Execution and Destructive Mechanics
Rapid is typically delivered via malicious email attachments (macros), exploit kits, or manual deployment by attackers who have compromised RDP credentials (`T1133`). Upon execution, the malware immediately attempts to elevate privileges. It aggressively executes commands to inhibit system recovery: it deletes Volume Shadow Copies (`vssadmin.exe Delete Shadows /All /Quiet`), disables Windows Startup Repair (`bcdedit /set {default} recoveryenabled No`), and clears Windows Event Logs to hinder forensics (`T1490`, `T1070.001`). It then iterates through all local and mapped network drives (`T1486`), encrypting files while specifically avoiding critical OS files to ensure the system can still boot and display the ransom note.

Indicators of Compromise & Impact
The impact is total data loss without a backup. EDR platforms must alert on the execution of `vssadmin.exe` or `wbadmin.exe` with deletion flags, which is a near-certain indicator of ransomware behavior. Network logs may show brief connections to C2 servers to exchange encryption keys. System logs will be conspicuously empty if the malware succeeded in clearing them.

MITRE ATT&CK Techniques

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

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

Sigma Rule

title: Suspicious Rapid Activity
id: 2a9bdb3d28d0f32d560fb8a27ae1f473
status: experimental
description: Detects generic indicators of the rapid malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*rapid*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Instantly sever the infected endpoint and any associated servers from the network to halt the lateral spread of the encryption process over SMB shares.
2. Do NOT reboot the infected machines, as the encryption keys may still reside in volatile memory (RAM), which is critical for potential forensic recovery.
3. Identify and immediately disable the compromised RDP accounts or VPN profiles that the attackers used for initial access.
4. Initiate the disaster recovery plan, prioritizing the restoration of critical data from secure, offline backups.

What to Avoid

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

1. Do not pay the ransom immediately; engage professional incident response and negotiation firms, as paying does not guarantee a decryptor.
2. Avoid wiping the machines until forensic images have been captured; crucial evidence regarding the initial access vector is stored in the system.

References & External Analysis

• Search "rapid" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: ransomware)

Explore other malware families in the same category:

• Loskad
• Luder
• Soldier
• Binder
• Schwarzesonne

Machine-readable

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