Jobcrypter
Overview
Executive Summary
JobCrypter is a destructive Ransomware family designed to extort financial payment from victims by encrypting their critical data. It is known for its relatively crude implementation but devastating impact, prioritizing rapid, widespread encryption of local and network-mapped drives to cause maximum operational disruption. It often disguises its initial payload as a job application, resume, or HR-related document.Infection Vector and Technical Capabilities
JobCrypter is typically distributed via highly targeted spear-phishing campaigns directed at Human Resources (HR) departments or hiring managers. The emails contain malicious attachments (often ZIP files containing disguised executables, or Word documents with malicious macros) masquerading as resumes (e.g., `resume_applicant_name.exe` or `CV.docm`). Upon execution, JobCrypter initiates a destructive attack sequence:- Volume Shadow Copy Deletion: Before encryption begins, the ransomware executes commands (e.g., `vssadmin.exe Delete Shadows /All /Quiet`) to destroy local system backups and recovery points, ensuring the victim cannot easily restore their files.
- Rapid Encryption: It scans the hard drive and any accessible network shares for specific file extensions (documents, databases, images). It encrypts these files using strong cryptography and typically appends a unique extension (e.g., `.jobcrypt`) to the affected files.
- Ransom Note Generation: A text or HTML file is dropped onto the desktop and in encrypted directories. This note provides instructions on how to purchase cryptocurrency and contact the attackers (often via an anonymous email address) to obtain the decryption key.
Threat Assessment
A JobCrypter infection is a critical security incident resulting in immediate and often catastrophic loss of data availability. The targeted nature of the phishing campaigns makes HR and recruitment teams highly susceptible. The destruction of local backups means that without secure, offline backups, organizations face massive data loss.Incident Response and Remediation
- Immediate Network Severance: The infected endpoint must be immediately disconnected from the corporate network, Wi-Fi, and any VPNs to prevent the ransomware from propagating to mapped network drives and cloud storage sync folders.
- Preserve Memory (Do Not Reboot): If possible, capture a forensic image of the system's RAM before powering it down, as the decryption key might temporarily reside in volatile memory.
- Eradication and Restoration: Paying the ransom is strongly discouraged. The only reliable remediation strategy is a complete bare-metal wipe of the infected systems and a full restoration from secure, air-gapped backups.
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: T1566.001 T1486 T1490
Tactical Mitigations
Based on the techniques used by this family, consider the following defensive strategies:
- T1566.001: Scan email attachments for malicious macros, scripts, or suspicious archive files.
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_JOBCRYPTER {
meta:
description = "Detects Jobcrypter (ransomware)"
author = "SystemHelpdesk Boilerplate Generator"
date = "2026-07-06"
strings:
$s1 = "jobcrypter" ascii wide nocase
$s2 = "ransom.jobcrypter" ascii wide nocase
$s3 = "trojan-ransom.win32.jobcrypter" ascii wide nocase
$s4 = "win32/filecoder.jobcrypter" ascii wide nocase
condition:
uint16(0) == 0x5a4d and any of them
}Sigma Rule
title: Suspicious Jobcrypter Activity
id: e710a12b6cad2398d82134a8d1856bd9
status: experimental
description: Detects generic indicators of the jobcrypter malware family.
logsource:
category: process_creation
product: windows
detection:
selection:
Image|endswith:
- '\cmd.exe'
- '\powershell.exe'
CommandLine|contains:
- "*jobcrypter*"
- "*ransom.jobcrypter*"
- "*trojan-ransom.win32.jobcrypter*"
- "*win32/filecoder.jobcrypter*"
condition: selection
level: mediumReferences & External Analysis
- Search "jobcrypter" on VirusTotal (External Analysis)
Frequently Asked Questions
How do I remove the Jobcrypter Ransomware from Windows?
Manual removal of Jobcrypter 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 Jobcrypter a virus or a Ransomware?
Jobcrypter is classified as a Ransomware. Unlike traditional viruses that infect files, modern malware like Jobcrypter typically operates as a standalone payload designed to compromise systems, steal data, or deploy secondary stage implants.
What are the main symptoms of a Jobcrypter infection?
Symptoms of Jobcrypter 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: ransomware)
Explore other malware families in the same category:
Protect Your Network Against Ransomwares
Want to prevent Jobcrypter and similar threats from compromising your organization? Read our comprehensive defensive guide: Ransomware Protection Guide.
Machine-readable
Get this profile as JSON: https://jordan123234-malware-families-explorer.static.hf.space/api/jobcrypter.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.