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Newly SLEEPWALKER Backdoor Waits for One Crafted Packet, Then Runs Its Own Bytecode

An independent malware researcher has documented a previously unreported Windows backdoor, dubbed SLEEPWALKER, that stays inert in memory until a specifically crafted network packet reaches the machine and then runs commands written in a 23-instruction language of its own design.

The sample is an unsigned 64-bit Windows dynamic-link library (DLL) of 59,904 bytes, built to be side-loaded into&

9:10 am, August 26, 2026

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id: 2724
uid: 7uS8E
insdate: 2026-08-26 09:10:08
title: Newly SLEEPWALKER Backdoor Waits for One Crafted Packet, Then Runs Its Own Bytecode
additional: An independent malware researcher has documented a previously unreported Windows backdoor, dubbed SLEEPWALKER, that stays inert in memory until a specifically crafted network packet reaches the machine and then runs commands written in a 23-instruction language of its own design.

The sample is an unsigned 64-bit Windows dynamic-link library (DLL) of 59,904 bytes, built to be side-loaded into&
category: Cybersecurity
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