Sqlcrack

Overview

HackTool:Win32/Sqlcrack is a detection for specialized offensive security tools and brute-force utilities designed to compromise backend databases, predominantly Microsoft SQL Server (MSSQL). While security professionals use similar tools for penetration testing, Sqlcrack detections almost universally indicate malicious lateral movement within a compromised network. Threat actors use these tools to discover unpatched database servers (`T1046`), brute-force administrative credentials (`T1110.001`), and subsequently execute arbitrary code or deploy ransomware across the domain.

Understanding Sqlcrack (Database Exploitation Tools)
To an end-user, the execution of this tool is invisible. For a security operations center (SOC), a Sqlcrack detection on an internal endpoint is a 'hair-on-fire' alert. It means an attacker has already bypassed the perimeter, established a foothold, and is actively seeking to compromise the organization's most critical data repositories.

Execution and Exploitation Mechanics
Attackers typically deploy Sqlcrack tools (which may be custom binaries, Python scripts, or PowerShell modules) after gaining initial access via phishing or RDP compromise. The tool rapidly scans the internal subnet for port 1433 (default MSSQL). Once a target is found, it employs dictionary attacks or credential stuffing against the default `sa` (System Administrator) account (`T1110.001`). If successful, the tool leverages the `xp_cmdshell` extended stored procedure (`T1505.001`) to execute shell commands directly on the underlying Windows OS of the database server, granting the attacker full system control to dump data or deploy ransomware.

Indicators of Compromise & Impact
The impact is the total compromise of the database server, leading to massive data exfiltration or catastrophic ransomware deployment. Host-based IoCs on the source machine include the presence of the brute-force tool and associated password dictionary files (e.g., `passwords.txt`). EDR telemetry on the *target* database server is critical: look for massive spikes in 'Failed Login' events (Event ID 4625) followed by a 'Successful Login' (Event ID 4624) from an unusual internal IP, and the sudden enabling and execution of `xp_cmdshell`.

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

Sigma Rule

title: Suspicious Sqlcrack Activity
id: e51289a1d9561950a706bcd7b047a35e
status: experimental
description: Detects generic indicators of the sqlcrack malware family.
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith:
            - '\cmd.exe'
            - '\powershell.exe'
        CommandLine|contains:
            - "*sqlcrack*"
    condition: selection
level: medium

Containment & Response Steps

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

1. Immediately isolate both the source machine running the Sqlcrack tool and the targeted MSSQL server to prevent further lateral movement.
2. Review MSSQL authentication logs (or Windows Event Logs) to determine if the brute-force attack was successful.
3. If compromised, immediately disable the `sa` account, rotate all database service account passwords, and disable `xp_cmdshell`.
4. Conduct a full forensic analysis of the compromised database server to determine what data was accessed or if ransomware staged.

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 attack failed just because the AV caught the tool on one machine; the attacker may be running it from multiple compromised endpoints.
2. Avoid leaving the default `sa` account enabled or allowing MSSQL servers to be accessible from non-administrative network segments.

References & External Analysis

• Search "sqlcrack" on VirusTotal (External Analysis)

Frequently Asked Questions

Related Families (Category: ransomware)

Explore other malware families in the same category:

• Krdr
• Medfos
• Xxycff
• Imali
• Atmulator

Machine-readable

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