Clear it in 3 steps
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Start the environment
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Investigate the target
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Submit the flag
Analyze the recovered memory-string record `memstrings.txt` and reconstruct the obfuscated second-stage payload. Base64-decode the `stage2=` data, undo its single-byte XOR, and retrieve the flag from the recovered dropper's campaign tag.
The stage2= line in memstrings.txt is the obfuscated second-stage payload (Base64)
After base64-decoding, brute-force the single-byte XOR key (0x00-0xff) for plaintext starting with #!/bin/sh
The recovered dropper's campaign-tag line holds the flag (grep will not find it)