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 our technical analysis hubs and the official MITRE ATT&CK framework:

MITRE D3FEND™ Defensive Countermeasures

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

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_SQLCRACK_T1_ARTIFACT {
    meta:
        description = "Tier 1 Primitive Artifact: Raw string matches for Sqlcrack"
        tier = "T1 - Primitive Artifact"
        confidence = "Low-Medium (Fast Triage)"
        author = "SystemHelpdesk Threat Research Desk"
        date = "2026-10-14"
    strings:
        $s1 = "sqlcrack" ascii wide nocase
    condition:
        uint16(0) == 0x5a4d and any of them
}

title: SystemHelpDesk Detection - Sqlcrack (Ransomware) Execution & Triage
id: ecfa3b38-02c7-55af-8e58-8a4da128a74c
status: production
description: Detects execution, defense evasion, and persistence behaviors associated
  with the Sqlcrack malware family. Detects volume shadow copy deletion, boot status
  tampering, and recovery inhibition characteristic of modern ransomware operations.
references:
- https://malware-families-catalog.systemhelpdesk.com/families/sqlcrack
- https://malware-families-catalog.systemhelpdesk.com/defensive/ransomware-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.ransomware
- author.ricky-jordan
- source.systemhelpdesk-mfc
- attack.t1110_001
- attack.t1046
- attack.t1505_001
logsource:
  category: process_creation
  product: windows
detection:
  selection_process:
    Image|endswith:
    - \vssadmin.exe
    - \wmic.exe
    - \wbadmin.exe
    - \bcdedit.exe
    CommandLine|contains:
    - delete shadows
    - shadowcopy delete
    - resize shadowstorage
    - recoveryenabled no
    - ignoreallfailures
  condition: selection_process
falsepositives:
- Legitimate enterprise administrative scripts during approved change windows
- Authorized IT software deployment utilities and backup management agents
level: critical

rule MALWARE_WIN_SQLCRACK_T3_ATTRIBUTION {
    meta:
        description = "Tier 3 Attribution Fingerprint: Heuristic detection for Sqlcrack 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 = "sqlcrack" 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 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)
• Search "sqlcrack" on Any.Run (Sandbox Sandbox)
• Search "sqlcrack" on MalwareBazaar (Malware Samples)

Frequently Asked Questions

Related Threats (Category: Ransomware)

Explore other documented threats in the same operational category:

• Optispeed
• Mbrlock
• Rietspoof
• Boaxxe
• Yywaa08Jovdg
• Figyek
• Safebreas
• Ruandmel

Machine-readable

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