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kkrypt0nn/APT_Lotus_Blossom_Chrysalis_Backdoor.yar

Last active February 5, 2026 14:06
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A YARA rule to detect known samples by SHA-256 of the Chrysalis Backdoor (by Chinese APT Lotus Blossom) in the Notepad++ Hijack
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APT_Lotus_Blossom_Chrysalis_Backdoor.yar
import "hash"
rule NotepadPlusPlus_Hijack_Chrysalis_Known_Hashes
{
meta:
description = "Detects known samples by SHA-256 of the Chrysalis Backdoor (by Chinese APT Lotus Blossom) in the Notepad++ Hijack"
author = "Krypton (@kkrypt0nn)"
date = "2026-02-02"
source = "https://www.rapid7.com/blog/post/tr-chrysalis-backdoor-dive-into-lotus-blossoms-toolkit/"
condition:
hash.sha256(0, filesize) in (
"a511be5164dc1122fb5a7daa3eef9467e43d8458425b15a640235796006590c9", // update.exe
"8ea8b83645fba6e23d48075a0d3fc73ad2ba515b4536710cda4f1f232718f53e", // NSIS.nsi
"2da00de67720f5f13b17e9d985fe70f10f153da60c9ab1086fe58f069a156924", // BluetoothService.exe
"77bfea78def679aa1117f569a35e8fd1542df21f7e00e27f192c907e61d63a2e", // BluetoothService
"3bdc4c0637591533f1d4198a72a33426c01f69bd2e15ceee547866f65e26b7ad", // log.dll
"9276594e73cda1c69b7d265b3f08dc8fa84bf2d6599086b9acc0bb3745146600", // u.bat
"f4d829739f2d6ba7e3ede83dad428a0ced1a703ec582fc73a4eee3df3704629a", // conf.c
"4a52570eeaf9d27722377865df312e295a7a23c3b6eb991944c2ecd707cc9906", // libtcc.dll
"831e1ea13a1bd405f5bda2b9d8f2265f7b1db6c668dd2165ccc8a9c4c15ea7dd", // admin
"0a9b8df968df41920b6ff07785cbfebe8bda29e6b512c94a3b2a83d10014d2fd", // loader1
"4c2ea8193f4a5db63b897a2d3ce127cc5d89687f380b97a1d91e0c8db542e4f8", // uffhxpSy
"e7cd605568c38bd6e0aba31045e1633205d0598c607a855e2e1bca4cca1c6eda", // loader2
"078a9e5c6c787e5532a7e728720cbafee9021bfec4a30e3c2be110748d7c43c5", // 3yzr31vk
"b4169a831292e245ebdffedd5820584d73b129411546e7d3eccf4663d5fc5be3", // ConsoleApplication2.exe
"7add554a98d3a99b319f2127688356c1283ed073a084805f14e33b4f6a6126fd", // system
"fcc2765305bcd213b7558025b2039df2265c3e0b6401e4833123c461df2de51a" // s047t5g.exe
)
}
@korpx
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korpx commented Feb 5, 2026 •
edited
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syntax error, unexpected , expecting '}'

Yara 4.5.2 on Debian / 4.5.5 on Win11

@kkrypt0nn
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kkrypt0nn commented Feb 5, 2026 •
edited
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syntax error, unexpected , expecting '}'

Yara 4.5.2 on Debian / 4.5.5 on Win11

Apologies for the mistake, I first had

hash.sha256(0, filesize) == "a511be5164dc1122fb5a7daa3eef9467e43d8458425b15a640235796006590c9" or
....

for every hash, then read about in and thought I tested it...

I've updated the Gist as well as the repository which contains updated data as well, completely forgot I had that Gist setup -> https://github.com/kkrypt0nn/yara-rules/blob/main/rules/malware/APT_Lotus_Blossom_Chrysalis_Backdoor.yar

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