conficker.exe

What is conficker.exe?

conficker.exe is part of the Conficker worm family. It infects Windows PCs by exploiting vulnerabilities, weak passwords, and removable media, then spreads to network shares, disables security services, blocks updates, and downloads payloads from remote servers. It can persist via registry keys and scheduled tasks, hindering cleanup.

Conficker propagates through network shares and removable drives, uses a domain-generation scheme to fetch updates, and installs as a service. It disables security services and blocks Windows Update, making cleanup harder.

Types of Conficker Components

• Service/Dropper: Creates services and copies itself to system paths (e.g., avserve.exe)
• Network Propagator: Scans for shared folders and uses brute-forcing to spread
• Payload Loader: Downloads modules from command-and-control domains
• Registry Bean: Creates registry keys to maintain persistence
• Scheduled Task: Schedules tasks to reinstall after cleanup
• Defense Evasion: Disables security tools and Windows updates

Is conficker.exe Safe?

No - conficker.exe is malware; do not trust copies outside official sources.

Is conficker.exe a Virus or Malware?

The real conficker.exe is malware. It’s part of a worm family that compromises Windows systems to spread and download payloads.

How to Tell if conficker.exe is Legitimate or Malware

1. File Location:: Check for copies in C:\Windows\System32\avserve.exe or C:\Windows\System32\avshadow.dll. Legitimate Windows binaries are not named this way.
2. Digital Signature:: Right-click the file in Explorer → Properties → Digital Signatures. Legit Windows binaries from Microsoft will show 'Microsoft Windows' as signer; anything else is suspicious.
3. Resource Usage:: Infection often causes unusual network traffic and background CPU spikes; full cleanup is needed.
4. Behavior:: If the file runs when the system is clean, or if there’s mass replication across shares, it’s likely Conficker.

Why Is conficker.exe Running on My PC?

Conficker runs to propagate, maintain persistence, and fetch updates or payloads. It may run even when user isn’t actively using Windows to ensure infection persists.

Reasons it's running:

• Active Infection and Propagation: The worm scans for network shares and uses brute-forcing to spread to other machines.
• Background Payload Retrieval: Beacons to command-and-control servers to download modules and updates.
• Startup Persistence: Registry Run keys and scheduled tasks ensure it relaunches after reboot.
• Disabling Security Tools: Conficker disables or tamper with security services to avoid detection.
• Removable Media and AutoRun: Propagation via infected USB drives and auto-run capabilities on removable media.

What is conficker.exe?

conficker.exe is part of the Conficker worm family. It infects Windows PCs by exploiting vulnerabilities, weak passwords, and removable media, then spreads to network shares, disables security services, blocks updates, and downloads payloads from remote servers. It can persist via registry keys and scheduled tasks, hindering cleanup.

Common Problems: Conficker-Related Issues

If a PC is infected with Conficker, you may see network slowness, disabled updates, unusual shares, and persistent startup tasks. Below are typical causes and fixes.

Common Causes & Solutions

• Propagation via network shares: Limit/disable file sharing, segment networks, and apply strong passwords to prevent spread.
• Disabled Windows Update or Defender: Re-enable security services and apply patches; run offline scans if needed.
• Autostart entries created by Conficker: Use Autoruns to locate and remove Run/Startup entries pointing to avserve.exe.
• Payload heavy network beaconing: Block outbound traffic to known C2 domains and domains generated by Conficker's algorithm; keep firewall enabled.
• Outdated system and missing patches: Apply MS08-067 and subsequent Windows patches; ensure automatic updates are enabled.
• Removable media infection: Disable autorun on USB/CD and scan removable drives before use.

Related Processes