2026 Ransomware Surge: Qilin Leads Relentless Wave of 9,000+ Confirmed Encryption Attacks

Introduction

The narrative that ransomware is merely a nuisance or a fading trend is officially dead. According to data independently confirmed by Ransomnews and analyzed by Security Arsenal, there have been 9,291 confirmed encryption-based cyber incidents worldwide between January 2018 and July 2026. These aren't speculative leak-site listings; these are verified attacks involving victim disclosures, regulatory filings, and official statements.

The data reveals a disturbing persistence in threat velocity: since 2023, we have sustained over 1,400 confirmed attacks per year. As of mid-2026, the Qilin ransomware group has emerged as the dominant threat actor, with the United States remaining the most targeted geography. For CISOs and SOC managers, this isn't just a statistic—it is an operational reality that requires immediate defensive hardening.

Technical Analysis

The Threat Landscape

The surge in Qilin activity signifies a shift toward highly sophisticated Ransomware-as-a-Service (RaaS) operations. While the specific CVEs vary by campaign (often exploiting zero-days in edge devices like VPNs or phishing-delivered payloads), the consistent thread is the "encryption-based" nature of the incident.

Threat Actor: Qilin (aka Agenda) Primary Target: U.S. entities (Critical Infrastructure, Healthcare, Finance) Attack Vector: Phishing, Exploitation of Public-Facing Applications (often unpatched services), Initial Access Brokers (IABs).

Exploitation Status

• Active Exploitation: Confirmed. Qilin is actively deploying payloads in 2026.
• Methodology: Qilin typically employs a double-extortion model. Before encryption begins, actors exfiltrate sensitive data. The encryption phase targets local backups and shadow copies to prevent easy recovery.
• Persistence: Post-compromise, actors often use tools like AnyDesk, Splashtop, or RustDesk for C2, coupled with custom Go-based encryptors to evade signature-based detection.

Detection & Response

Given the high volume of confirmed attacks, relying on antivirus signatures is insufficient. We must detect the behaviors preceding encryption.

SIGMA Rules

The following rules target common precursors to Qilin and similar ransomware operations: the destruction of volume shadow copies and the use of data exfiltration tools often associated with this actor.

---
title: Potential Ransomware Activity - VSS Shadow Copy Deletion
id: 9e29c9c1-1f7d-4b2a-9b0a-0c1a2b3c4d5e
status: experimental
description: Detects attempts to delete Volume Shadow Copies, a common step in Qilin and other ransomware attacks to prevent recovery.
references:
 - https://attack.mitre.org/techniques/T1490/
author: Security Arsenal
date: 2026/08/01
tags:
 - attack.impact
 - attack.t1490
logsource:
 category: process_creation
 product: windows
detection:
 selection:
   Image|endswith:
     - '\vssadmin.exe'
     - '\wmic.exe'
   CommandLine|contains:
     - 'delete shadows'
     - 'shadowcopy delete'
 condition: selection
falsepositives:
 - Legitimate system administration tasks (rare)
level: high
---
title: Suspicious Rclone Execution for Data Exfiltration
id: a1b2c3d4-5e6f-7a8b-9c0d-1e2f3a4b5c6d
status: experimental
description: Detects the execution of rclone, a tool frequently used by threat actors like Qilin for exfiltrating large volumes of data to cloud storage prior to encryption.
references:
 - https://attack.mitre.org/techniques/T1041/
author: Security Arsenal
date: 2026/08/01
tags:
 - attack.exfiltration
 - attack.t1041
logsource:
 category: process_creation
 product: windows
detection:
 selection:
   Image|endswith:
     - '\rclone.exe'
 condition: selection
falsepositives:
 - Authorized use by IT personnel for backup/sync
level: medium

KQL (Microsoft Sentinel / Defender)

This query hunts for the classic "Triple Kill" often seen in Qilin ransomware incidents: stopping backup services, deleting shadows, and triggering encryption.

let ProcessList = dynamic(['vssadmin.exe', 'wmic.exe', 'wbadmin.exe', 'powershell.exe']);
DeviceProcessEvents
| where Timestamp > ago(1d)
| where FileName in~ ProcessList
| extend CommandLine = coalesce(CommandLine, "")
| where CommandLine contains "delete" 
   or CommandLine contains "stop" 
   or CommandLine contains "shadowcopy" 
   or CommandLine contains "backup"
| project Timestamp, DeviceName, AccountName, FileName, ProcessCommandLine = CommandLine, InitiatingProcessFileName
| order by Timestamp desc

Velociraptor VQL

Hunt for suspicious processes executing from temporary directories or user profiles, a common technique for ransomware payloads dropped by Qilin operators.

-- Hunt for processes running from suspicious locations (User Profile or Temp)
SELECT Pid, Name, CommandLine, Exe, Username, CreateTime
FROM pslist()
WHERE Exe =~ 'C:\\Users\\.*\\.exe'
   OR Exe =~ 'C:\\Windows\\Temp\\.*.exe'
   AND Name NOT IN ('explorer.exe', 'chrome.exe', 'firefox.exe', 'msedge.exe', 'winword.exe', 'excel.exe')

Remediation Script (PowerShell)

Run this script on critical endpoints to verify that Volume Shadow Copy Service (VSS) is operational and hasn't been disabled by recent malware activity.

# Check VSS Service Status and Accessibility
Write-Host "[+] Checking VSS Service Status..." -ForegroundColor Cyan
$vssService = Get-Service -Name VSS -ErrorAction SilentlyContinue

if ($vssService.Status -ne 'Running') {
    Write-Host "[!] ALERT: VSS Service is not running. Current State: " $vssService.Status -ForegroundColor Red
    Write-Host "[!] Attempting to start VSS Service..." -ForegroundColor Yellow
    try {
        Start-Service -Name VSS -ErrorAction Stop
        Write-Host "[+] VSS Service started successfully." -ForegroundColor Green
    } catch {
        Write-Host "[!] Failed to start VSS Service. Manual intervention required." -ForegroundColor Red
    }
} else {
    Write-Host "[+] VSS Service is running." -ForegroundColor Green
}

# Check for recent shadow copy deletions in Event Log
Write-Host "[+] Checking Event Logs for VSS Delete operations (Last 24h)..." -ForegroundColor Cyan
$events = Get-WinEvent -FilterHashtable @{LogName='Application'; ProviderName='VSS'; ID=12343; StartTime=(Get-Date).AddHours(-24)} -ErrorAction SilentlyContinue
if ($events) {
    Write-Host "[!] WARNING: Detected VSS Shadow Copy Deletion events in the last 24 hours!" -ForegroundColor Red
    $events | Select-Object TimeCreated, Message | Format-List
} else {
    Write-Host "[+] No recent VSS deletion events found." -ForegroundColor Green
}

Remediation

The persistence of these attacks since 2018, culminating in the 2026 Qilin surge, requires a defense-in-depth approach:

1. Immediate Patching: While specific CVEs for Qilin vary, the entry point is almost always a known vulnerability in public-facing infrastructure (VPN gateways, web servers). Prioritize patching external assets within 24 hours of release.
2. Secure Backups: Implement immutable backups (WORM storage). If the adversary can delete shadow copies (as seen in the Technical Analysis), local VSS is not a reliable recovery mechanism alone.
3. Network Segmentation: Ensure RDP and SMB ports (445, 3389) are blocked from the internet. Strictly segment backup networks from production LANs to prevent lateral movement.
4. Access Controls: Revoke unnecessary administrative rights. Qilin operators often abuse valid credentials to deploy the encryptor across the domain.
5. Incident Response Plan: Update your IR playbooks specifically for "Encryption-Based Incidents." Ensure communication templates for regulatory filings are ready, as the 9,291 confirmed attacks indicate regulators are increasingly vigilant.

Related Resources

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