The Qilin ransomware operation (also known as Agenda) has claimed responsibility for a significant cyber incident against Die Linke, a prominent political party in Germany. While the party has confirmed an "incident," the full scope of the breach—specifically regarding data exfiltration—remains a critical point of verification. For security defenders, this serves as a stark reminder of the relentless targeting of political and high-value entities by Ransomware-as-a-Service (RaaS) models. The immediate risk is not just operational downtime via encryption, but the potential leak of sensitive communications, donor data, and strategic documents. This situation demands immediate forensic validation and aggressive threat hunting to determine if the threat actor's claims of data theft are substantiated.

Technical Analysis

Threat Actor Profile: Qilin (Agenda) Qilin is a sophisticated RaaS group known for employing double-extortion tactics—encrypting victim data and threatening to release it unless a ransom is paid. They typically target enterprise environments and have recently escalated their focus on critical infrastructure and political organizations.

Attack Vector & Methodology While the specific initial access vector for the Die Linke incident is still under investigation, Qilin historically leverages:

• Valid Accounts: Compromised credentials obtained via initial access brokers or phishing.
• Exploitation of Public-Facing Applications: Vulnerabilities in unpatched services (often VPNs or remote access tools).

The Core Threat: Double Extortion The claim of stealing data is the primary leverage point. This indicates the attackers likely spent significant time dwelling in the network (dwell time) prior to encryption, identifying and exfiltrating high-value data.

Affected Platforms:

• Windows environments (Primary target for Qilin payloads).
• Active Directory (abused for lateral movement).
• Cloud storage repositories (often targeted for bulk data exfiltration).

Exploitation Status:

• Confirmed Active Exploitation: Yes, as evidenced by the victim statement and actor claim.
• IOCs: Specific hashes or C2 domains have not been publicly disclosed in the initial report, requiring defense-in-depth hunting strategies rather than simple indicator blocking.

Detection & Response

Sigma Rules

---
title: Potential Qilin Ransomware Shadow Copy Deletion
id: 7c6370f0-d4f7-4023-9c1e-2e5f7a9b1c2d
status: experimental
description: Detects the deletion of Volume Shadow Copies using vssadmin, a common defense evasion technique employed by Qilin (Agenda) ransomware to prevent system recovery and forensic analysis.
references:
    - https://www.bleepingcomputer.com/news/security/qilin-ransomware-hit-german-political-party-die-linke/
author: Security Arsenal
date: 2026/04/06
logsource:
    category: process_creation
    product: windows
detection:
    selection:
        Image|endswith: '\vssadmin.exe'
        CommandLine|contains|all:
            - 'delete shadows'
            - '/all'
            - '/quiet'
    condition: selection
falsepositives:
    - System administrators managing disk space manually (rare)
    - Legitimate backup scripts (should be reviewed)
level: critical
tags:
    - attack.impact
    - attack.t1490
---
title: Potential Data Exfiltration via Rclone
id: 3d8e5f1a-2b4c-4d8e-9f1a-2b4c4d8e9f1a
status: experimental
description: Detects the execution of rclone with command-line arguments indicative of data synchronization or copy operations, a technique frequently utilized by Qilin (Agenda) actors for data exfiltration prior to encryption.
references:
    - https://www.bleepingcomputer.com/news/security/qilin-ransomware-hit-german-political-party-die-linke/
author: Security Arsenal
date: 2026/04/06
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        Image|endswith: '\rclone.exe'
    selection_cli:
        CommandLine|contains:
            - 'sync'
            - 'copy'
            - 'config'
            - 'lsf'
    condition: selection_img and selection_cli
falsepositives:
    - Legitimate use of rclone by administrators for backup or file transfer
level: high
tags:
    - attack.exfiltration
    - attack.t1567.002

KQL — Microsoft Sentinel / Defender

// Hunt: Qilin (Agenda) Ransomware - Potential Data Exfiltration via CLI Tools
// Description: Detects high-volume outbound data transfers initiated by command-line interfaces (PowerShell, CMD) 
// or legitimate file transfer tools (Rclone, Curl) often abused by Qilin actors to stage and exfiltrate sensitive data.
let HighVolumeThreshold = 10485760; // 10MB
let SuspiciousTools = dynamic(["powershell.exe", "cmd.exe", "pwsh.exe", "rclone.exe", "curl.exe", "wget.exe", "sftp.exe"]);

DeviceNetworkEvents
| where ActionType == "ConnectionSuccess"
| where InitiatingProcessFileName in~ (SuspiciousTools)
| where RemoteIPType != "Private" // Exclude local/internal traffic
| summarize TotalBytesSent = sum(SentBytes), ConnectionCount = count() 
    by DeviceName, InitiatingProcessId, InitiatingProcessFileName, InitiatingProcessCommandLine, RemoteIP, RemotePort
| where TotalBytesSent > HighVolumeThreshold
| project DeviceName, InitiatingProcessFileName, InitiatingProcessCommandLine, TotalBytesSent, ConnectionCount, RemoteIP, RemotePort
| order by TotalBytesSent desc

Velociraptor VQL

name: Windows.Hunt.QilinRansomware
description: |
  Threat hunt artifact for Qilin (Agenda) Ransomware. 
  Focuses on identifying process execution chains, file system artifacts 
  (ransom notes, exfil tools), and network connections indicative of 
  data theft and encryption preparation.

sources:
- name: ProcessHunt
  description: |
    Hunts for suspicious process activity related to Qilin operations, 
    including shadow copy deletion, credential dumping, and recon tools.
  query: |
    SELECT
      Pid,
      Ppid,
      Name,
      Exe,
      Cmdline,
      Username,
      lookupSID(Subject=Sid).Name as ResolvedUser,
      StartTime
    FROM pslist()
    WHERE
      -- Identify ransomware preparation (VSS deletion, backup clearing)
      (Name IN ("cmd.exe", "powershell.exe", "pwsh.exe", "vssadmin.exe", "wbadmin.exe", "bcdedit.exe") AND
       (Cmdline =~ "delete" OR Cmdline =~ "shadow" OR Cmdline =~ "stop" OR Cmdline =~ "wevtutil" OR Cmdline =~ "clear"))
      -- Identify credential dumping tools
      OR (Name =~ "procdump" OR Name =~ "mimikatz" OR Name =~ "Rubeus")
      -- Identify data exfiltration tools (Qilin often uses Rclone or Mega)
      OR (Name =~ "rclone" OR Name =~ "MEGAsync" OR Name =~ "megacmd")
      -- Identify reconnaissance tools (SharpHound)
      OR (Name =~ "SharpHound" OR Name =~ "BloodHound")
      -- Identify suspicious executables running from user temp/appdata
      OR (Name =~ ".exe" AND (Exe =~ "AppData\\\\Local\\\\Temp" OR Exe =~ "AppData\\\\Roaming") AND SigState != "Signed")

- name: FileSystemHunt
  description: |
    Hunts for ransom notes and dropped payloads using glob and stat.
  query: |
    -- Check specific root paths for ransom notes using stat
    LET root_notes = SELECT FullPath, Size, Mtime 
                     FROM stat(path="C:/RECOVER_FILES.txt")
    
    -- Glob for additional ransom notes and dropped tools
    LET glob_files = SELECT FullPath, Size, ModTime, Mode
                     FROM glob(globs='''
                       C:/Users/*/Desktop/*RECOVER*.txt,
                       C:/Users/*/Desktop/README*.txt,
                       C:/Users/*/Downloads/*RECOVER*.txt,
                       C:/Windows/Temp/rclone.exe,
                       C:/Users/*/AppData/Local/Temp/rclone.exe
                     ''')

    SELECT * FROM chain(root_notes, glob_files)

- name: NetworkHunt
  description: |
    Hunts for established network connections that may indicate C2 
    communication or active data exfiltration.
  query: |
    SELECT
      RemoteAddr,
      RemotePort,
      Family,
      ProcessName,
      Pid,
      State,
      lookupSID(Subject=process_get_pid(pid=Pid).Sid).Name as ConnUser
    FROM netstat()
    WHERE
      State = "ESTABLISHED"
      -- Exclude local traffic and standard web ports
      AND NOT (RemoteAddr =~ "127.0.0.1" OR RemoteAddr =~ "::1" OR RemotePort IN (80, 443, 3389))
      -- Focus on connections from exfil tools or scripting languages
      AND (ProcessName =~ "rclone" OR ProcessName =~ "powershell" OR ProcessName =~ "cmd" OR ProcessName =~ "MEGAsync")

Remediation Script

<#
.SYNOPSIS
    Qilin (Agenda) Ransomware Threat Hunting and Hardening Script
.DESCRIPTION
    This script hunts for specific Indicators of Compromise (IOCs) associated with the Qilin/Agenda
    ransomware group, focusing on their use of rclone for exfiltration, common persistence mechanisms,
    and shadow copy destruction. It also applies immediate hardening steps.
#>

Requires Admin privileges to access Event Logs and modify registry

if (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole] "Administrator")) { Write-Warning "Please run this script as an Administrator." exit }

Write-Host " Initiating Qilin/Agenda Ransomware Threat Hunt " -ForegroundColor Cyan Write-Host "-------------------------------------------------" -ForegroundColor Cyan

1. Hunt for rclone.exe

Qilin actors frequently use the legitimate tool 'rclone' to exfiltrate data to cloud storage.

We search common user directories and temp folders for unauthorized copies.

Write-Host "`n[*] Checking for rclone.exe (Exfil Tool)..." -ForegroundColor Yellow $exfilPaths = @("C:\Users", "C:\Windows\Temp", "C:\Temp") $foundRclone = $false

foreach ($path in $exfilPaths) { if (Test-Path $path) { $results = Get-ChildItem -Path $path -Filter "rclone.exe" -Recurse -ErrorAction SilentlyContinue if ($results) { foreach ($item in $results) { Write-Host " [!] FOUND: $($item.FullName) (Created: $($item.CreationTime))" -ForegroundColor Red $foundRclone = $true } } } } if (-not $foundRclone) { Write-Host " [-] No unauthorized rclone instances found." -ForegroundColor Green }

2. Event Log Analysis: Shadow Copy Deletion

Qilin typically deletes Volume Shadow Copies using 'vssadmin.exe' or 'wbadmin.exe' to prevent recovery.

Write-Host "`n[] Analyzing Event Logs for VSS/Shadow Copy deletion..." -ForegroundColor Yellow $vssEvents = Get-WinEvent -LogName Application -FilterXPath "[System[(EventID=7034 or EventID=7036) and TimeCreated[timediff(@SystemTime) <= 604800000]]]" -ErrorAction SilentlyContinue | Where-Object { $.Message -match "vssadmin|wbadmin" -and $.Message -match "delete shadows" }

if ($vssEvents) { Write-Host " [!] ALERT: Potential Shadow Copy deletion activity detected in the last 7 days." -ForegroundColor Red $vssEvents | Format-List TimeCreated, Message } else { Write-Host " [-] No recent Shadow Copy deletion events found via standard Service logs." -ForegroundColor Green }

3. File System IOC Hunt

Qilin often leaves ransom notes named similar to 'RECOVER-[ID]-[KEY].txt' or appends specific extensions.

We scan common document roots for recently modified suspicious files.

Write-Host "`n[*] Scanning for Ransom Notes and encrypted extensions..." -ForegroundColor Yellow $driveRoots = Get-PSDrive -PSProvider FileSystem | Select-Object -ExpandProperty Root $suspiciousNames = @("RECOVER", "README", "HOW_TO_DECRYPT", "qilin", "agenda") $timeThreshold = (Get-Date).AddHours(-24)

foreach ($root in $driveRoots) { # Skip CD-ROMs if ($root.RootType -eq "CD") { continue }

try {
    # Search for suspicious text files modified in last 24 hours
    $files = Get-ChildItem -Path $root -Include *.txt, *.html, *.json -Recurse -ErrorAction SilentlyContinue | 
             Where-Object { $_.LastWriteTime -gt $timeThreshold -and ($suspiciousNames | Where-Object { $_.Name -like "*$($_)*" }) }
             
    if ($files) {
        Write-Host "  [!] Suspicious files found in $root" -ForegroundColor Red
        $files | Select-Object FullName, LastWriteTime
    }
} catch {
    # Ignore access errors
}

}

4. Registry Persistence Check

Qilin may create persistence via Run keys or Scheduled Tasks.

Write-Host "`n[*] Checking Registry Run Keys for suspicious executables..." -ForegroundColor Yellow $runKeys = @( "HKLM:\Software\Microsoft\Windows\CurrentVersion\Run", "HKLM:\Software\Microsoft\Windows\CurrentVersion\RunOnce", "HKCU:\Software\Microsoft\Windows\CurrentVersion\Run", "HKCU:\Software\Microsoft\Windows\CurrentVersion\RunOnce" )

$suspiciousPaths = @("C:\Windows\Temp", "C:\Users\Public", "AppData\Local\Temp") foreach ($key in $runKeys) { if (Test-Path $key) { Get-ItemProperty -Path $key -ErrorAction SilentlyContinue | Get-Member -MemberType NoteProperty | Where-Object { $val = (Get-ItemProperty -Path $key).($.Name) $suspiciousPaths | Where-Object { $val -like "*$*" } } | ForEach-Object { $val = (Get-ItemProperty -Path $key).($.Name) Write-Host " [!] Suspicious Run Key Entry: $($.Name) -> $val" -ForegroundColor Red } } }

5. Hardening: Patch and Configuration Check

Ensure Windows Defender Real-time Monitoring is active (Qilin often disables it)

Write-Host "`n[*] Hardening: Verifying Windows Defender Status..." -ForegroundColor Yellow try { $MpPreference = Get-MpPreference if ($MpPreference.DisableRealtimeMonitoring -eq $true) { Write-Host " [!] CRITICAL: Real-time Monitoring is DISABLED. Attempting to enable..." -ForegroundColor Red Set-MpPreference -DisableRealtimeMonitoring $false -Force Write-Host " [+] Real-time Monitoring Enabled." -ForegroundColor Green } else { Write-Host " [+] Real-time Monitoring is Active." -ForegroundColor Green }

# Check for Controlled Folder Access (Ransomware protection)
if ($MpPreference.EnableControlledFolderAccess -ne 1) {
    Write-Host "  [!] WARNING: Controlled Folder Access is not enabled (Recommended against Qilin)." -ForegroundColor Yellow
}

} catch { Write-Host " [-] Could not verify Defender status. Security Center might be disabled." -ForegroundColor Red }

6. Network Hardening: RDP

Qilin often brute-forces RDP. If not strictly necessary, disable it.

Write-Host "`n[*] Checking RDP Status..." -ForegroundColor Yellow $rdpProperty = Get-ItemProperty -Path "HKLM:\System\CurrentControlSet\Control\Terminal Server" -Name "fDenyTSConnections" if ($rdpProperty.fDenyTSConnections -eq 0) { Write-Host " [!] RDP is ENABLED. If not required, disable it immediately." -ForegroundColor Yellow } else { Write-Host " [+] RDP is Disabled." -ForegroundColor Green }

Write-Host "`n[*] Threat Hunt Complete." -ForegroundColor Cyan

Remediation

1. Verify Data Breach Scope: Immediately initiate a forensic review of logs focusing on the timeline provided by Qilin. Verify specifically what data left the environment rather than relying solely on the victim's initial assessment.

2. Credential Reset & MFA Enforcement: Assume credentials have been compromised. Force a password reset for all privileged accounts and enforce phishing-resistant MFA (e.g., FIDO2) across the board.

3. Isolate Affected Segments: If the encryption phase has started, isolate infected hosts immediately via VLAN segmentation or endpoint isolation controls to prevent propagation to file shares.

4. Audit External Access: Review VPN logs and Remote Desktop Protocol (RDP) access logs for the past 60 days. Qilin frequently exploits valid accounts to gain initial access.

5. Patch Management: While the specific CVE for this entry is unknown, ensure all external-facing infrastructure, particularly VPN gateways and remote access tools, are patched against the latest critical vulnerabilities (e.g., Citrix Bleed, Zerologon, VPN flaws).

Related Resources

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