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The article explains why Huorong antivirus may mistakenly delete the Windows Explorer process, provides step‑by‑step commands to restore explorer.exe and add it to the whitelist, and also includes a promotional book giveaway for readers.
Huorong’s threat intelligence team discovered that the Qike PDF Converter distributes a hidden malicious proxy module through download‑site installers, leading to unexplained high CPU usage, persistent system services, and widespread infection traced back to a Hangzhou tech company, urging users to update antivirus definitions and remove the software.
Security researchers discovered that the Qike PDF Converter embeds a malicious proxy module that silently spreads via download‑site installers, hijacks system processes, consumes CPU, persists as a startup service, and originates from a Hangzhou tech company, highlighting the risks of silent promotion in freeware distribution.