How to remove SYS01 Stealer

What is SYS01 Stealer

SYS01 Stealer is a sophisticated piece of malware identified as an information-stealing trojan designed to covertly infiltrate computer systems and exfiltrate sensitive data. This malicious software primarily targets login credentials, cookies, and data associated with Facebook ad and business accounts. Cybercriminals exploit this stolen information to conduct identity theft, financial fraud, and even corporate espionage, often selling the data on underground marketplaces for profit. The malware is distributed through deceptive tactics such as fake Facebook profiles and misleading Google ads, enticing users to download compromised files masquerading as legitimate content. Once installed, SYS01 operates stealthily, often remaining undetected for extended periods while it silently harvests and transmits valuable information to the attacker’s command and control servers. The stolen credentials can also facilitate further attacks, such as credential stuffing and phishing, amplifying the damage inflicted on victims. Given its severe impact, it is crucial to employ robust cybersecurity measures and regularly scan systems with reputable anti-malware solutions to detect and remove such threats. Preventive actions, including being wary of suspicious links and maintaining updated security software, are essential in safeguarding against SYS01 Stealer and similar cyber threats.

How SYS01 Stealer infected your system

The SYS01 Stealer typically infiltrates computers through deceptive tactics that exploit users’ trust and curiosity. Cybercriminals behind SYS01 leverage Google ads and fake Facebook profiles to promote enticing content such as games, adult content, and pirated software, luring victims into downloading malicious files. Once a user clicks on these misleading ads or links, they are directed to download a ZIP file disguised as a legitimate application or game. The infection process involves a two-stage attack, where a legitimate C# application is used as a loader, vulnerable to side-loading attacks, and contains a hidden malicious DLL. This loader then executes an Inno-Setup installer, which drops a complete PHP application containing malicious scripts that exfiltrate sensitive information. By disguising as legitimate software and utilizing clever social engineering, SYS01 manages to silently infiltrate systems and steal valuable data without raising immediate suspicion.

1. Download SYS01 Stealer Removal Tool
2. Use Windows Malicious Software Removal Tool to remove SYS01 Stealer
3. Use Autoruns to remove SYS01 Stealer
4. Files, folders and registry keys of SYS01 Stealer
5. Other aliases of SYS01 Stealer
6. How to protect from threats, like SYS01 Stealer

Remove SYS01 Stealer manually

Manual removal of SYS01 Stealer by inexperienced users may become a difficult task because it does not create entries in Add/Remove Programs under Control Panel, does not install browser extensions, and uses random file names. However, there are pre-installed instruments in the Windows system, that allow you to detect and remove malware without using third-party applications. One of them is Windows Malicious Software Removal Tool. It comes with Windows Update in Windows 11, 10, 8. 8.1. For older operating system you can download it here: 64-bit version | 32-bit version.

Remove SYS01 Stealer using Windows Malicious Software Removal Tool

1. Type mrt in the search box near Start Menu.
2. Run mrt clicking on found item.
3. Click Next button.
4. Choose one of the scan modes Quick scan, Full scan, Customize scan (Full scan recommended).
5. Click Next button.
6. Click on View detailed results of the scan link to view the scan details.
7. Click Finish button.

Remove SYS01 Stealer using Autoruns

SYS01 Stealer often sets up to run at Windows startup as an Autorun entry or Scheduled task.

1. Download Autoruns using this link.
2. Extract the archive and run Autoruns.exe file.
3. In Options menu make sure there are checkboxes near Hide Empty Locations, Hide Microsoft Entries, and Hide Windows Entries.
4. Search for suspicious entries with weird names or running from locations like: C:\{username}\AppData\Roaming.
5. Right-click on suspicious entry and choose Delete. This will prevent the threat to run at startup.
6. Switch to Scheduled Tasks tab and do the same.
7. To remove files themselves, click on suspicious entries and choose Jump to Entry…. Remove files or registry keys found.

Remove files, folder and registry keys of SYS01 Stealer

SYS01 Stealer files and folders


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SYS01 Stealer registry keys


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Aliases of SYS01 Stealer

How to protect from threats, like SYS01 Stealer, in future

Standard Windows protection or any decent third-party antivirus (Norton, Avast, Kaspersky) should be able to detect and remove SYS01 Stealer. However, if you got infected with SYS01 Stealer with existing and updated security software, you may consider changing it. To feel safe and protect your PC from SYS01 Stealer on all levels (browser, e-mail attachments, Word or Excel scripts, file system) we recommend a leading provider of internet security solutions – BitDefender. Its solutions both for home and business users proved to be one of the most advanced and effective. Choose and get your BitDefender protection via the button below:

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