We provide an in-depth analysis of Conficker's Security Product Disablement logic*. Those responsible for this outbreak have demonstrated Internet-wide programming skills, advanced cryptographic skills, custom dual-layer code packing and code obfuscation skills, and in-depth knowledge of Windows internals and security products. They are among the first to introduce the Internet rendezvous point scheme, and have now integrated a sophisticated P2P protocol that does not require an embedded peer list. They have continually seeded the Internet with new MD5 variants, and have adapted their code base to address the latest attempts to thwart Conficker. They have infiltrated government sites, military networks, home PCs, critical infrastructure, small networks, and universities, around the world. C then installs several in-memory patches to DLLs, and embeds other mechanisms to thwart security applications that would otherwise detect its presence. C modifies the host domain name service (DNS) APIs to block various security-related network connections (Domain Lookup Prevention), and installs a pseudo-patch to repair the 445/TCP vulnerability, while maintaining a backdoor for reinfection (Local Host Patch Logic). This pseudo patch protects the host from buffer overflows by sources other than those performed by the Conficker authors or their infected peers. Like Conficker B, C incorporates logic to defend itself from security products that would otherwise attempt to detect and remove it. C spawns a security product disablement thread. This thread disables critical host security services, such as Windows defender, as well as Windows services that deliver security patches and software updates.
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