Quick Answer
zeroaccess-driver.sys is malware. This kernel driver is used by the ZeroAccess botnet to conceal its activity, maintain persistence, and control malicious tasks. Detection and removal require dedicated tools.
Is it a Virus?
YES - Malware
Must be located at C:\Windows\System32\drivers\zeroaccess-driver.sys
Can I Disable?
YES - But not recommended; disabling may destabilize Windows and allow malware components to fail-safe
Kernel drivers affect OS stability; disabling may crash or leave system unbootable
Can I Remove?
⚠ YES - Use reputable anti-malware in Safe Mode; manual removal is risky
Removal requires comprehensive malware cleanup; manual removal risks system instability
What is zeroaccess-driver.sys?
zeroaccess-driver.sys is a kernel-mode driver component used by the ZeroAccess botnet. This driver operates at the core of Windows, enabling stealth techniques such as file and process hiding, registry manipulation, and persistence across reboots to support the malware's botnet activities.
This kernel driver runs with high privileges, hooking kernel objects and manipulating the system to hide malicious files, processes, and network activity. It communicates with a command-and-control server to receive updates and instructions.
Quick Fact: ZeroAccess leverages a driver to evadе traditional security tools; it uses kernel hooks and service persistence to maintain control even after restarts.
ZeroAccess Driver Components
- Kernel Driver: Core component loaded into kernel space
- Loader Component: Initial user-mode loader that installs the driver
- Control Module: Orchestrates botnet tasks and C2 communication
Is zeroaccess-driver.sys Safe?
No, zeroaccess-driver.sys is not safe. It is a kernel-mode malware component associated with the ZeroAccess botnet.
Is zeroaccess-driver a Virus or Malware?
The real zeroaccess-driver is malware. It uses kernel-level hooks and persistence mechanisms to evade detection. Red flags include unexpected drivers, abnormal startup entries, and high CPU/memory for no obvious reason.
How to Tell if zeroaccess-driver.sys is Legitimate or Malware
- File Location:: Must be located at
C:\Windows\System32\drivers\zeroaccess-driver.sys. Any driver with this name outside that folder warrants suspicion.
- Digital Signature:: Right-click the driver file -> Properties -> Digital Signatures. It should show a trusted signer; most ZeroAccess-related drivers lack legitimate signatures.
- Resource Usage:: Unexplained CPU or memory usage attributed to a kernel driver is a strong malware indicator; monitor with Task Manager and Kernel-level tools.
- Behavior:: If the driver loads before user action or after system boot regardless of security software, it is suspicious and should be removed.
Red Flags: If you find zeroaccess-driver.sys in C:\Windows\System32\drivers with no legitimate digital signature, or if it loads when you haven't started security software, run a full malware scan immediately. Beware of similarly named files such as zeroaccess-driver.dll or zeroaccess-driver.exe.
Why Is zeroaccess-driver.sys Running on My PC?
zeroaccess-driver.sys runs when the ZeroAccess malware operates, maintaining kernel-level control over its components, hiding its artifacts, and enabling C2 communication. It can survive reboots and complicate detection.
Reasons it's running:
- Kernel Persistence: Driver persists across reboots to maintain botnet presence and ensure continued control.
- Loader Activation: A companion loader may initialize the driver after system startup or user login.
- Stealth Techniques: Driver hooks and rootkit-like hiding methods conceal files, processes, and registry entries from security tools.
- C2 Communication: The driver enables periodic communication with a command-and-control server for updates and tasks.
- Drive-by or User Action: In some cases, infection occurs via drive-by downloads or user-initiated malware installs that install the driver.
Can I Disable or Remove zeroaccess-driver.sys?
No, disabling alone will not fully remove it and may destabilize Windows. A complete removal requires malware cleanup tools and safe reboot procedures.
How to Stop zeroaccess-driver.sys
- Boot in Safe Mode: Restart Windows in Safe Mode with Networking to prevent malware from loading.
- Update Security Software: Update Windows Defender or a reputable anti-malware program to ensure coverage against ZeroAccess.
- Run Full Scan: Perform a full system scan and quarantine/remediate zeroaccess-driver.sys and related components.
- Disable Startup Items: Open Task Manager > Startup and disable entries related to ZeroAccess, or use msconfig to disable them.
- Manual Cleanup (Advanced): If safe, stop the service and delete the driver file. Use sc stop and sc delete for the service name, then remove registry keys if present.
How to Uninstall/Remove ZeroAccess Driver
- ✔ Boot into Safe Mode with Networking
- ✔ Run a full system malware scan with a reputable tool and allow quarantine/removal
- ✔ Reboot and perform another scan to verify removal
Common Problems: Kernel Driver Malicious Activity
If zeroaccess-driver.sys is active, you may see system instability, unusual network activity, or hidden processes; this section covers common problems and targeted fixes.
Common Causes & Solutions
- Kernel driver persistence: Remove driver entries via Safe Mode and ensure all related files are quarantined
- Rootkit-like hiding: Use specialized rootkit cleaners and deep system scans
- Disabled security tools: Re-enable security software and perform complete cleanup
- Unauthorized startup: Disable or remove startup entries and scheduled tasks related to ZeroAccess
- Network C2 chatter: Block outbound connections to known C2 domains during cleanup
- Residual components: Search for and remove leftover files, registry keys, and service entries
Quick Fixes:
1. Run a full system malware scan with a reputable tool
2. Update all security patches and definitions
3. Review startup items and disable suspicious entries
4. Check for network anomalies and blocked connections
5. Consider a clean OS reinstallation if persistence remains
Frequently Asked Questions
What is zeroaccess-driver.sys?
zeroaccess-driver.sys is malware that loads at kernel level to hide itself and perform botnet tasks; remove with anti-malware tools in Safe Mode.
Is zeroaccess-driver.sys a true Windows driver?
Yes, zeroaccess-driver.sys is malware. It is not a legitimate Windows driver and should be removed with a reputable anti-malware tool.
How do I detect zeroaccess-driver.sys on my PC?
To know if your PC has zeroaccess-driver.sys, scan with updated security software; look for unknown drivers in C:\Windows\System32\drivers and unusual network activity.
How do I remove zeroaccess-driver.sys safely?
Removal typically requires booting in Safe Mode, updating security definitions, and running a full system scan; reboot and re-scan after removal.
Does ZeroAccess mine Bitcoin or mine cryptocurrency?
ZeroAccess is known for using kernel drivers to persist; it may mine cryptocurrency and control tasks; clean removal is necessary to prevent reinfection.
Can ZeroAccess spread to other devices?
Yes, ZeroAccess can spread via drive-by downloads and compromised software; ensure all software is up to date and security protections are enabled.