rule win_miancha_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        version = "1"
        description = "Detects win.miancha."
        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.miancha"
        malpedia_rule_date = "20231130"
        malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
        malpedia_version = "20230808"
        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 = { 7412 8d542418 52 ff15???????? }
            // n = 4, score = 200
            //   7412                 | je                  0x14
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_1 = { 6803000080 ff15???????? 85c0 741f 6a00 }
            // n = 5, score = 200
            //   6803000080           | push                0x80000003
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   741f                 | je                  0x21
            //   6a00                 | push                0

        $sequence_2 = { 8b15???????? 894808 8a0d???????? 89500c 884810 }
            // n = 5, score = 200
            //   8b15????????         |                     
            //   894808               | mov                 dword ptr [eax + 8], ecx
            //   8a0d????????         |                     
            //   89500c               | mov                 dword ptr [eax + 0xc], edx
            //   884810               | mov                 byte ptr [eax + 0x10], cl

        $sequence_3 = { 40 50 56 8b35???????? 6a02 6a00 }
            // n = 6, score = 200
            //   40                   | inc                 eax
            //   50                   | push                eax
            //   56                   | push                esi
            //   8b35????????         |                     
            //   6a02                 | push                2
            //   6a00                 | push                0

        $sequence_4 = { 85f6 7412 8d542418 52 ff15???????? 50 }
            // n = 6, score = 200
            //   85f6                 | test                esi, esi
            //   7412                 | je                  0x14
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_5 = { ff15???????? 50 ffd6 85c0 741a }
            // n = 5, score = 200
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   741a                 | je                  0x1c

        $sequence_6 = { 8d542418 52 ff15???????? 50 ffd6 85c0 }
            // n = 6, score = 200
            //   8d542418             | lea                 edx, [esp + 0x18]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax

        $sequence_7 = { 50 68???????? e8???????? 33f6 83c408 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   33f6                 | xor                 esi, esi
            //   83c408               | add                 esp, 8

        $sequence_8 = { 8910 8b15???????? 894804 8b0d???????? 895008 8a15???????? }
            // n = 6, score = 200
            //   8910                 | mov                 dword ptr [eax], edx
            //   8b15????????         |                     
            //   894804               | mov                 dword ptr [eax + 4], ecx
            //   8b0d????????         |                     
            //   895008               | mov                 dword ptr [eax + 8], edx
            //   8a15????????         |                     

        $sequence_9 = { 8910 8b15???????? 894804 8b0d???????? 895008 8a15???????? 89480c }
            // n = 7, score = 200
            //   8910                 | mov                 dword ptr [eax], edx
            //   8b15????????         |                     
            //   894804               | mov                 dword ptr [eax + 4], ecx
            //   8b0d????????         |                     
            //   895008               | mov                 dword ptr [eax + 8], edx
            //   8a15????????         |                     
            //   89480c               | mov                 dword ptr [eax + 0xc], ecx

    condition:
        7 of them and filesize < 376832
}

/*
    This Yara ruleset is under the GNU-GPLv2 license (http://www.gnu.org/licenses/gpl-2.0.html) and open to any user or organization, as    long as you use it under this license.

*/
import "pe"

rule win_miancha_w0 {
    meta:
        author = "Context Threat Intelligence"
        date = "2014/01/27"
        description = "Bytes inside"
        reference = "http://www.contextis.com/documents/30/TA10009_20140127_-_CTI_Threat_Advisory_-_The_Monju_Incident1.pdf"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.miancha"
        malpedia_version = "20170521"
        malpedia_sharing = "TLP:WHITE"
        malpedia_license = ""
        
    strings:
        $0x = { 57 5b 5a 5a 51 57 40 34 31 67 2e 31 70 34 5c 40 40 44 3b 25 3a 19 1e 5c 7b 67 60 2e 34 31 67 2e 31 70 19 1e 55 77 77 71 64 60 2e 34 3e 3b 3e 19 1e 57 7b 7a 60 71 7a 60 39 40 6d 64 71 2e 34 60 71 6c 60 3b 7c 60 79 78 19 1e 44 66 7b 6c 6d 39 57 7b 7a 7a 71 77 60 7d 7b 7a 2e 34 5f 71 71 64 39 55 78 7d 62 71 19 1e 57 7b 7a 60 71 7a 60 39 78 71 7a 73 60 7c 2e 34 24 19 1e 19 1e }
        $1 = { 5c e7 99 bd e5 8a a0 e9 bb 91 5c }
        $1x = { 48 f3 8d a9 f1 9e b4 fd af 85 48 }
        $2 = "DllCanLoadNow"
        $2x = { 50 78 78 57 75 7a 58 7b 75 70 5a 7b 63 }
        $3x = { 5a 61 79 76 71 66 34 7b 72 34 67 61 76 7f 71 6d 67 2e 34 31 70 } 
        $4 = "JXNcc2hlbGxcb3Blblxjb21tYW5k"
        $4x = { 5e 4c 5a 77 77 26 7c 78 76 53 6c 77 76 27 56 78 76 78 6c 7e 76 26 25 60 4d 43 21 7f }
        $6 = "C:\\Users\\why\\"
        $6x = { 57 2e 48 41 67 71 66 67 48 63 7c 6d 48 }
        $7 = "g:\\ykcx\\"
        $7x = { 73 2E 48 6D 7F 77 6C 48 }
        $8 = "(miansha)"
        $8x = { 3C 79 7D 75 7A 67 7C 75 3D }
        $9 = "server(\xE5\xA3\xB3)"
        $9x = { 7C 2E 48 26 24 25 27 3A 25 25 3A 26 21 48 67 71 66 62 71 66 3C F1 B7 A7 3D 48 46 71 78 71 75 67 71 48 67 71 66 62 71 66 3A 64 70 76 }
        $cfgDecode = { 8a ?? ?? 80 c2 7a 80 f2 19 88 ?? ?? 41 3b ce 7c ??}

   condition:
       any of them
}