rule win_daxin_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.daxin."
        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.daxin"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 2bc2 d1f8 99 f7f9 }
            // n = 4, score = 400
            //   2bc2                 | sub                 eax, edx
            //   d1f8                 | sar                 eax, 1
            //   99                   | cdq                 
            //   f7f9                 | idiv                ecx

        $sequence_1 = { 0fb7c1 0bd0 0fb7c6 66c1c008 0fb7c8 8bc6 }
            // n = 6, score = 300
            //   0fb7c1               | movzx               eax, dx
            //   0bd0                 | dec                 eax
            //   0fb7c6               | mov                 esi, eax
            //   66c1c008             | dec                 ecx
            //   0fb7c8               | cmp                 eax, esp
            //   8bc6                 | je                  0xfc

        $sequence_2 = { e8???????? 488bf0 493bc4 0f84f3000000 }
            // n = 4, score = 300
            //   e8????????           |                     
            //   488bf0               | inc                 esp
            //   493bc4               | add                 edx, eax
            //   0f84f3000000         | inc                 ecx

        $sequence_3 = { eb59 410fb74302 4c8bc7 ba0c000000 448bc8 }
            // n = 5, score = 300
            //   eb59                 | inc                 ecx
            //   410fb74302           | shr                 edx, 0x10
            //   4c8bc7               | rol                 ax, 8
            //   ba0c000000           | movzx               edx, ax
            //   448bc8               | inc                 ebp

        $sequence_4 = { 4183f901 7507 410fb600 4403d0 410fb7c2 }
            // n = 5, score = 300
            //   4183f901             | inc                 ecx
            //   7507                 | cmp                 ecx, 1
            //   410fb600             | jne                 9
            //   4403d0               | inc                 ecx
            //   410fb7c2             | movzx               eax, byte ptr [eax]

        $sequence_5 = { b201 488bf1 895808 ff15???????? 448bc3 }
            // n = 5, score = 300
            //   b201                 | xor                 ecx, ecx
            //   488bf1               | inc                 esp
            //   895808               | cmp                 dword ptr [eax + 0x54], ecx
            //   ff15????????         |                     
            //   448bc3               | jbe                 0x38

        $sequence_6 = { 4533c9 44394854 7632 488d5014 }
            // n = 4, score = 300
            //   4533c9               | movzx               ecx, ax
            //   44394854             | mov                 eax, esi
            //   7632                 | inc                 ecx
            //   488d5014             | movzx               eax, dx

        $sequence_7 = { 410fb7c2 41c1ea10 66c1c008 0fb7d0 }
            // n = 4, score = 300
            //   410fb7c2             | movzx               eax, cx
            //   41c1ea10             | or                  edx, eax
            //   66c1c008             | movzx               eax, si
            //   0fb7d0               | rol                 ax, 8

        $sequence_8 = { 8a4500 32c2 884500 45 4b }
            // n = 5, score = 100
            //   8a4500               | dec                 eax
            //   32c2                 | not                 ecx
            //   884500               | dec                 eax
            //   45                   | dec                 ecx
            //   4b                   | dec                 esp

        $sequence_9 = { 7438 50 e8???????? e8???????? }
            // n = 4, score = 100
            //   7438                 | cdq                 
            //   50                   | idiv                ecx
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_10 = { e8???????? 8d83b9010000 6880000000 50 }
            // n = 4, score = 100
            //   e8????????           |                     
            //   8d83b9010000         | sub                 ecx, ecx
            //   6880000000           | dec                 ebp
            //   50                   | add                 ecx, eax

        $sequence_11 = { 56 85c0 7421 8b701c }
            // n = 4, score = 100
            //   56                   | cdq                 
            //   85c0                 | idiv                ecx
            //   7421                 | sub                 eax, edx
            //   8b701c               | sar                 eax, 1

        $sequence_12 = { 8bf8 85ff 7538 e8???????? }
            // n = 4, score = 100
            //   8bf8                 | sub                 eax, edx
            //   85ff                 | sar                 eax, 1
            //   7538                 | cdq                 
            //   e8????????           |                     

        $sequence_13 = { c6420406 66c7020001 c6420504 66c742020800 894a18 }
            // n = 5, score = 100
            //   c6420406             | idiv                ecx
            //   66c7020001           | push                esi
            //   c6420504             | test                eax, eax
            //   66c742020800         | je                  0x23
            //   894a18               | mov                 esi, dword ptr [eax + 0x1c]

        $sequence_14 = { f7d1 23c1 8bd0 8bc8 c1ea02 }
            // n = 5, score = 100
            //   f7d1                 | cdq                 
            //   23c1                 | sub                 eax, edx
            //   8bd0                 | sar                 eax, 1
            //   8bc8                 | cdq                 
            //   c1ea02               | idiv                ecx

    condition:
        7 of them and filesize < 3475456
}