rule win_snappy_client_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.snappy_client."
        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.snappy_client"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { eb11 83e63f 7507 57 e8???????? 59 885c3e28 }
            // n = 7, score = 100
            //   eb11                 | jmp                 0x13
            //   83e63f               | and                 esi, 0x3f
            //   7507                 | jne                 9
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   885c3e28             | mov                 byte ptr [esi + edi + 0x28], bl

        $sequence_1 = { f20f5ec1 0f57c9 f20f5ac0 f30f1141f0 0f28c3 0fb747fa f20f2ac8 }
            // n = 7, score = 100
            //   f20f5ec1             | divsd               xmm0, xmm1
            //   0f57c9               | xorps               xmm1, xmm1
            //   f20f5ac0             | cvtsd2ss            xmm0, xmm0
            //   f30f1141f0           | movss               dword ptr [ecx - 0x10], xmm0
            //   0f28c3               | movaps              xmm0, xmm3
            //   0fb747fa             | movzx               eax, word ptr [edi - 6]
            //   f20f2ac8             | cvtsi2sd            xmm1, eax

        $sequence_2 = { ff751c 837dd008 ff7518 0f4345bc ff7514 ff7510 50 }
            // n = 7, score = 100
            //   ff751c               | push                dword ptr [ebp + 0x1c]
            //   837dd008             | cmp                 dword ptr [ebp - 0x30], 8
            //   ff7518               | push                dword ptr [ebp + 0x18]
            //   0f4345bc             | cmovae              eax, dword ptr [ebp - 0x44]
            //   ff7514               | push                dword ptr [ebp + 0x14]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   50                   | push                eax

        $sequence_3 = { 8bf1 8d8ebc000000 c706???????? e8???????? 8b8eb0000000 85c9 7405 }
            // n = 7, score = 100
            //   8bf1                 | mov                 esi, ecx
            //   8d8ebc000000         | lea                 ecx, [esi + 0xbc]
            //   c706????????         |                     
            //   e8????????           |                     
            //   8b8eb0000000         | mov                 ecx, dword ptr [esi + 0xb0]
            //   85c9                 | test                ecx, ecx
            //   7405                 | je                  7

        $sequence_4 = { eb27 8d45dc 8bcf 50 e8???????? 8365fc00 83fe04 }
            // n = 7, score = 100
            //   eb27                 | jmp                 0x29
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   8bcf                 | mov                 ecx, edi
            //   50                   | push                eax
            //   e8????????           |                     
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   83fe04               | cmp                 esi, 4

        $sequence_5 = { eb04 0fb645ec 99 8996ac000000 8986a8000000 c686a000000001 eb06 }
            // n = 7, score = 100
            //   eb04                 | jmp                 6
            //   0fb645ec             | movzx               eax, byte ptr [ebp - 0x14]
            //   99                   | cdq                 
            //   8996ac000000         | mov                 dword ptr [esi + 0xac], edx
            //   8986a8000000         | mov                 dword ptr [esi + 0xa8], eax
            //   c686a000000001       | mov                 byte ptr [esi + 0xa0], 1
            //   eb06                 | jmp                 8

        $sequence_6 = { ff7754 50 e8???????? 8bf0 c645fc05 8d4dd0 6a04 }
            // n = 7, score = 100
            //   ff7754               | push                dword ptr [edi + 0x54]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   c645fc05             | mov                 byte ptr [ebp - 4], 5
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]
            //   6a04                 | push                4

        $sequence_7 = { ebda 6a09 53 ff15???????? e9???????? 6af0 53 }
            // n = 7, score = 100
            //   ebda                 | jmp                 0xffffffdc
            //   6a09                 | push                9
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   e9????????           |                     
            //   6af0                 | push                -0x10
            //   53                   | push                ebx

        $sequence_8 = { e8???????? 83c40c 85c0 7508 8b5508 8d4208 eb19 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   85c0                 | test                eax, eax
            //   7508                 | jne                 0xa
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8d4208               | lea                 eax, [edx + 8]
            //   eb19                 | jmp                 0x1b

        $sequence_9 = { ff75e8 a5 a5 a5 a5 ff55ec 8b3d???????? }
            // n = 7, score = 100
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   ff55ec               | call                dword ptr [ebp - 0x14]
            //   8b3d????????         |                     

    condition:
        7 of them and filesize < 7315456
}