rule win_gazer_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.gazer."
        info = "autogenerated rule brought to you by yara-signator"
        tool = "yara-signator v0.6.0"
        signator_config = "callsandjumps;datarefs;binvalue"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gazer"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

    /* DISCLAIMER
     * The strings used in this rule have been automatically selected from the
     * disassembly of memory dumps and unpacked files, using YARA-Signator.
     * The code and documentation is published here:
     * https://github.com/fxb-cocacoding/yara-signator
     * As Malpedia is used as data source, please note that for a given
     * number of families, only single samples are documented.
     * This likely impacts the degree of generalization these rules will offer.
     * Take the described generation method also into consideration when you
     * apply the rules in your use cases and assign them confidence levels.
     */


    strings:
        $sequence_0 = { ff15???????? 85c0 7511 e8???????? 84c0 }
            // n = 5, score = 300
            //   ff15????????         |                     
            //   85c0                 | mov                 dl, cl
            //   7511                 | shr                 ecx, 8
            //   e8????????           |                     
            //   84c0                 | inc                 ecx

        $sequence_1 = { ff15???????? 85c0 7511 e8???????? 84c0 7508 83c8ff }
            // n = 7, score = 300
            //   ff15????????         |                     
            //   85c0                 | call                edi
            //   7511                 | test                eax, eax
            //   e8????????           |                     
            //   84c0                 | jne                 0x1df2
            //   7508                 | lea                 eax, [ebp - 0x11c]
            //   83c8ff               | mov                 dword ptr [esi + 0x444], edi

        $sequence_2 = { 85c0 7511 e8???????? 84c0 7508 83c8ff e9???????? }
            // n = 7, score = 300
            //   85c0                 | push                dword ptr [esp + 0x3c]
            //   7511                 | push                eax
            //   e8????????           |                     
            //   84c0                 | lea                 eax, [esp + 0x44]
            //   7508                 | mov                 dword ptr [esp + 0x4c], edi
            //   83c8ff               | cmp                 dword ptr [esp + 0x44], edi
            //   e9????????           |                     

        $sequence_3 = { 85c0 7511 e8???????? 84c0 7508 83c8ff }
            // n = 6, score = 300
            //   85c0                 | xor                 edx, edx
            //   7511                 | dec                 ebp
            //   e8????????           |                     
            //   84c0                 | mov                 eax, dword ptr [ebp]
            //   7508                 | mov                 al, 1
            //   83c8ff               | lea                 ecx, [edx - 0x10]

        $sequence_4 = { 85c0 7511 e8???????? 84c0 7508 }
            // n = 5, score = 300
            //   85c0                 | push                eax
            //   7511                 | lea                 eax, [ebp - 0x34]
            //   e8????????           |                     
            //   84c0                 | push                eax
            //   7508                 | mov                 dword ptr [ebp - 0x28], 0xc

        $sequence_5 = { 85c0 7511 e8???????? 84c0 }
            // n = 4, score = 300
            //   85c0                 | dec                 eax
            //   7511                 | cmp                 ecx, -1
            //   e8????????           |                     
            //   84c0                 | je                  0x1066

        $sequence_6 = { ff15???????? 85c0 7511 e8???????? 84c0 7508 }
            // n = 6, score = 300
            //   ff15????????         |                     
            //   85c0                 | mov                 dword ptr [ebp - 0x18], edi
            //   7511                 | mov                 dword ptr [ebp - 8], edi
            //   e8????????           |                     
            //   84c0                 | call                dword ptr [eax + 0x34]
            //   7508                 | test                al, al

        $sequence_7 = { 7511 e8???????? 84c0 7508 83c8ff }
            // n = 5, score = 300
            //   7511                 | dec                 ecx
            //   e8????????           |                     
            //   84c0                 | mov                 dword ptr [edi + ebp], eax
            //   7508                 | dec                 eax
            //   83c8ff               | mov                 ecx, dword ptr [ebx + 0x20]

        $sequence_8 = { 7511 e8???????? 84c0 7508 83c8ff e9???????? }
            // n = 6, score = 300
            //   7511                 | movzx               ecx, word ptr [esi + edx*2 + 0x3e]
            //   e8????????           |                     
            //   84c0                 | inc                 ebp
            //   7508                 | add                 ecx, dword ptr [esp + eax*8]
            //   83c8ff               | mov                 eax, ecx
            //   e9????????           |                     

        $sequence_9 = { 4133c1 c1c107 4103c9 23c1 4133c0 03c2 8b54240c }
            // n = 7, score = 200
            //   4133c1               | dec                 eax
            //   c1c107               | mov                 ecx, ebp
            //   4103c9               | dec                 esp
            //   23c1                 | mov                 eax, dword ptr [ebx + 0x18]
            //   4133c0               | jmp                 0x91c
            //   03c2                 | dec                 esp
            //   8b54240c             | mov                 eax, esi

    condition:
        7 of them and filesize < 950272
}

// 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) 2017, 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.
//
import "pe"

rule win_gazer_w0 {
    meta:
        author      = "ESET Research"
        date        = "2017-08-30"
        info        = "certificate subject"
        description = "Turla Gazer malware"
        reference = "https://www.welivesecurity.com/2017/08/30/eset-research-cyberespionage-gazer/"
        source = "https://github.com/eset/malware-ioc/"
        contact = "github@eset.com"
        license = "BSD 2-Clause"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gazer"
        malpedia_version = "20170831"
        malpedia_license = "BSD 2-Clause"
        malpedia_sharing = "TLP:WHITE"

    condition:
        for any i in (0..pe.number_of_signatures - 1):
            (pe.signatures[i].subject contains "Solid Loop" or pe.signatures[i].subject contains "Ultimate Computer Support")
}

//
// Copyright (c) 2017, 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 win_gazer_w1 {
    meta:
        author      = "ESET Research"
        date        = "2017-08-30"
        info        = "logfile name"
        description = "Turla Gazer malware"
        reference = "https://www.welivesecurity.com/2017/08/30/eset-research-cyberespionage-gazer/"
        source = "https://github.com/eset/malware-ioc/"
        contact = "github@eset.com"
        license = "BSD 2-Clause"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gazer"
        malpedia_version = "20170831"
        malpedia_license = "BSD 2-Clause"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $s1 = "CVRG72B5.tmp.cvr"
        $s2 = "CVRG1A6B.tmp.cvr"
        $s3 = "CVRG38D9.tmp.cvr"

    condition:
        1 of them
}

//
// Copyright (c) 2017, 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 win_gazer_w2 {
    meta:
        author      = "ESET Research"
        date        = "2017-08-30"
        info        = "certificate"
        description = "Turla Gazer malware"
        reference = "https://www.welivesecurity.com/2017/08/30/eset-research-cyberespionage-gazer/"
        source = "https://github.com/eset/malware-ioc/"
        contact = "github@eset.com"
        license = "BSD 2-Clause"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.gazer"
        malpedia_version = "20170831"
        malpedia_license = "BSD 2-Clause"
        malpedia_sharing = "TLP:WHITE"

    strings:
        $certif1 = {52 76 a4 53 cd 70 9c 18 da 65 15 7e 5f 1f de 02}
        $certif2 = {12 90 f2 41 d9 b2 80 af 77 fc da 12 c6 b4 96 9c}

    condition:
        1 of them and filesize < 2MB
}