Sneed-Reactivity/yara-mikesxrs/eset/kobalos.yar
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// For feedback or questions contact us at: github@eset.com
// https://github.com/eset/malware-ioc/
//
// These YARA rules are provided to the community under the two-clause BSD
// license as follows:
//
// Copyright (c) 2020, ESET
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// 1. Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
rule kobalos
{
meta:
description = "Kobalos malware"
author = "Marc-Etienne M.Léveillé"
date = "2020-11-02"
reference = "http://www.welivesecurity.com"
reference2 = "https://www.welivesecurity.com/wp-content/uploads/2021/01/ESET_Kobalos.pdf"
source = "https://github.com/eset/malware-ioc/"
license = "BSD 2-Clause"
version = "1"
strings:
$encrypted_strings_sizes = {
05 00 00 00 09 00 00 00 04 00 00 00 06 00 00 00
08 00 00 00 08 00 00 00 02 00 00 00 02 00 00 00
01 00 00 00 01 00 00 00 05 00 00 00 07 00 00 00
05 00 00 00 05 00 00 00 05 00 00 00 0A 00 00 00
}
$password_md5_digest = { 3ADD48192654BD558A4A4CED9C255C4C }
$rsa_512_mod_header = { 10 11 02 00 09 02 00 }
$strings_rc4_key = { AE0E05090F3AC2B50B1BC6E91D2FE3CE }
condition:
any of them
}