Threat Profile
| Attribute | Details |
|---|---|
| Canonical Name | XehookStealer |
| Target Platform | Windows (all versions supporting .NET Framework) |
| File Type | Windows PE executable (.NET assembly) |
| First Documented | Early 2024 |
| Primary Distribution | SmokeLoader dropper campaigns |
| Cryptocurrency Support | Over 110 wallet types targeted |
| Browser Targets | Chromium-based (Chrome, Edge, Brave, Opera) and Gecko-based (Firefox) |
| 2FA Theft Capability | Yes — targets browser-based authenticator extensions |
| Code Lineage | Shares code overlaps with Agniane Stealer; linked to Cinoshi project |
| Delivery Model | Malware-as-a-Service (MaaS) evolution from free toolkits |
| Typical Payload Size | 500 KB – 2 MB (varies by build configuration) |
| Data Exfiltration | HTTP/HTTPS POST to attacker-controlled C2 servers |
How It Spreads
XehookStealer arrives on victim systems almost exclusively through multi-stage malware distribution chains, with SmokeLoader serving as the most common initial dropper. These campaigns typically begin with phishing emails containing malicious attachments or download links disguised as legitimate business documents, software updates, or password-protected archives. The initial infection establishes persistence on the system before downloading and executing XehookStealer as a secondary payload. The malware's distribution through a Malware-as-a-Service model means multiple threat actors can deploy it using different infection vectors. Security researchers have identified a progression from earlier free toolkits like Agniane Stealer to the commercial XehookStealer offering, suggesting an organized development operation behind its distribution. This evolution has made the threat more sophisticated while lowering the technical barrier for cybercriminals to deploy it. Common distribution vectors include: - **Email phishing campaigns** with macro-enabled Office documents that execute PowerShell scripts - **Fake software cracks and keygens** advertised on torrent sites and warez forums - **Malicious browser extensions** bundled with legitimate-looking productivity tools - **SmokeLoader infection chains** triggered by exploit kits or compromised advertising networks - **Software supply chain compromises** where legitimate installers are trojaned with XehookStealer - **SEO poisoning attacks** leading to fake download pages for popular free software - **Discord and Telegram links** shared in gaming and cryptocurrency communitiesWhat It Does On Your Machine
Once executed, XehookStealer immediately begins enumerating the local system for valuable data sources. The malware targets browser profile directories where credentials, cookies, and autofill data are stored, systematically copying these SQLite databases to temporary locations for processing. It specifically hunts for cryptocurrency wallet extensions and two-factor authentication plugins installed in Chromium and Firefox-based browsers, extracting seed phrases, private keys, and authentication tokens that would allow attackers to drain digital asset holdings. The stealer also scans common filesystem locations where standalone cryptocurrency wallet applications store their configuration files. With support for over 110 different wallet types, XehookStealer can recognize and exfiltrate data from everything from mainstream Bitcoin and Ethereum wallets to obscure altcoin clients. This comprehensive targeting makes it particularly effective against users who maintain diverse cryptocurrency portfolios across multiple wallet applications. All stolen data is compressed and transmitted to attacker-controlled command-and-control servers via HTTP/HTTPS POST requests. The malware typically operates quickly — completing its theft operations within 30-90 seconds — and may delete itself after successful exfiltration to reduce forensic evidence. Some variants install persistence mechanisms to enable repeated data collection, particularly targeting systems where users regularly access financial accounts.Manual Removal — Step by Step
Disconnect and Boot to Safe Mode
Immediately disconnect your computer from the internet by unplugging the Ethernet cable or disabling WiFi. Restart the computer and repeatedly press F8 (or Shift+F8 on newer systems) during boot to access the Advanced Boot Options menu. Select "Safe Mode with Networking" to prevent most malware from loading while maintaining limited connectivity for downloading removal tools.
End Suspicious Processes
Press Ctrl+Shift+Esc to open Task Manager. Look for unfamiliar processes consuming resources, particularly .NET executables with random names running from temporary directories. Right-click suspicious processes, select "Open File Location," then end the process. Note the file locations for deletion in later steps. XehookStealer often uses names mimicking legitimate Windows services.
Check Scheduled Tasks and Startup Items
Open Task Scheduler (search "taskschd.msc" in the Start menu) and review the Task Scheduler Library for any recently created tasks with cryptic names or pointing to executables in temporary folders. Delete suspicious entries. Next, run "msconfig" and check the Startup tab for unauthorized programs. Disable anything unfamiliar, especially items located in AppData or Temp directories.
Delete Malicious Files
Navigate to the file locations you identified in Task Manager. Common hiding spots include C:\Users\[YourName]\AppData\Local\Temp, C:\Users\[YourName]\AppData\Roaming, and C:\ProgramData. Delete any executables you identified as suspicious. Also check C:\Windows\Temp for recently modified .exe or .dll files. You may need to take ownership of some files through their Properties > Security settings.
Scan with Multiple Anti-Malware Tools
Download and run full system scans with at least two reputable anti-malware tools. Malwarebytes and Emsisoft Emergency Kit are effective choices for detecting XehookStealer variants. Run scans sequentially and quarantine all detected threats. Be aware that some XehookStealer builds may be detected under generic .NET stealer signatures rather than the specific XehookStealer name.
Clear Browser Data and Check Extensions
Open each installed browser and navigate to settings. Remove any extensions you don't recognize, particularly those related to cryptocurrency or password management that you didn't personally install. Clear all browsing data including cookies, cached files, and saved passwords for the maximum time range available. XehookStealer may have injected malicious browser components.
Reset Credentials Immediately
From a known-clean device (not the infected computer), change passwords for all accounts that were saved in your browsers or accessed from the infected machine. Prioritize cryptocurrency exchange accounts, banking sites, email accounts, and any services with payment methods attached. Enable two-factor authentication on all services that support it, using a hardware key or authenticator app on your phone — not browser-based 2FA which XehookStealer compromises.
Secure Cryptocurrency Wallets
If you had any cryptocurrency wallet software installed, consider those wallets compromised. Transfer all digital assets to new wallets with fresh seed phrases created on a clean device. Do not reuse any wallet files, seed phrases, or private keys that existed on the infected machine. Monitor blockchain explorers for unauthorized transactions from your old addresses.
Review Financial Accounts
Check bank statements, credit card transactions, and payment service accounts (PayPal, Venmo, etc.) for any unauthorized activity. Contact your financial institutions to report the potential compromise and request fraud monitoring. Place a fraud alert on your credit reports with the major bureaus. XehookStealer captures enough information to enable identity theft beyond just account access.
Verify System Integrity
Run the System File Checker by opening Command Prompt as administrator and typing "sfc /scannow". This verifies Windows system files haven't been corrupted. Follow with "DISM /Online /Cleanup-Image /RestoreHealth" to repair the Windows image. Restart the computer normally (not Safe Mode) and monitor for unusual behavior over the next 48 hours.
Prevention
- Never download software from unofficial sources. Pirated software, cracks, and keygens are primary distribution vectors for XehookStealer. Use only official vendor websites or verified app stores for all downloads, and verify digital signatures on installers before running them.
- Maintain up-to-date antivirus with real-time protection. While no antivirus catches everything, current definitions detect most XehookStealer variants. Configure your security software to scan downloads automatically and schedule weekly full system scans during off-hours.
- Use hardware security keys for cryptocurrency and critical accounts. Browser-based 2FA extensions are specifically targeted by XehookStealer. Hardware tokens like YubiKey or Titan Security Key provide authentication that cannot be stolen through software compromise.
- Store cryptocurrency in hardware wallets. For any significant digital asset holdings, use dedicated hardware wallets like Ledger or Trezor that keep private keys in isolated hardware. Never enter seed phrases on computers, and verify wallet addresses on the hardware device screen before confirming transactions.
- Keep Windows and all software fully patched. SmokeLoader and other droppers exploit known vulnerabilities to gain initial access. Enable automatic updates for Windows, browsers, and all installed applications. Pay particular attention to Adobe, Java, and Microsoft Office security updates.
- Implement email security practices. Enable advanced spam filtering, never enable macros in documents from unknown senders, and verify sender addresses carefully before opening attachments. Be suspicious of any unsolicited emails with attachments, particularly Office documents or archive files.
- Separate sensitive activities from risky browsing. Consider using a dedicated device or virtual machine for financial transactions and cryptocurrency management, keeping it isolated from general web browsing, torrenting, and gaming activities where infection risk is higher.
- Regular backups to offline storage. Maintain encrypted backups of important data on external drives that are disconnected when not in use. While XehookStealer focuses on credential theft rather than ransomware, comprehensive backups protect against the full spectrum of malware threats and provide recovery options if complete system reinstallation becomes necessary.