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Dropper Analysis: Stage 0 → Shellcode

Date: 01/04/25·Author: deepmalwaremalware-analysisdroppershellcodereversing

Dropper Analysis: Stage 0 → Shellcode

Date: 2025-04-01  ·  Author: deepmalware


TL;DR

Three-stage dropper: XOR-decrypted stage-1 blob → reflective PE loader → shellcode execution. All three stages live inside a single PE, separated by marker bytes.

Why it matters​

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Technique overview​

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Tradecraft notes​

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Detection considerations​

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Code​

stage1_decrypt.c
// placeholder
void decrypt(uint8_t *buf, size_t len, uint8_t key) {
for (size_t i = 0; i < len; i++)
buf[i] ^= key;
}

References​