Embedding files in echo requests and replies uses standard diagnostic traffic, which is commonly overlooked by monitoring tools. Placing content in name resolution queries uses a different protocol and does not resemble a diagnostic check. Forwarding information over a session-based encrypted tunnel or using a Trojan does not mimic routine diagnostic messages as closely as echo-based traffic does.
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What are echo requests and replies?
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Why are echo requests and replies less likely to be flagged by monitoring tools?
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How does embedding data in echo requests and replies work?