rule win_lambert_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-11-21"
        version = "1"
        description = "Detects win.lambert."
        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.lambert"
        malpedia_rule_date = "20221118"
        malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af"
        malpedia_version = "20221125"
        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 = { 73f2 85f6 7614 8a02 8801 }
            // n = 5, score = 400
            //   73f2                 | jae                 0xfffffff4
            //   85f6                 | test                esi, esi
            //   7614                 | jbe                 0x16
            //   8a02                 | mov                 al, byte ptr [edx]
            //   8801                 | mov                 byte ptr [ecx], al

        $sequence_1 = { 8b5118 895018 8b491c 8955f8 894dfc }
            // n = 5, score = 400
            //   8b5118               | mov                 edx, dword ptr [ecx + 0x18]
            //   895018               | mov                 dword ptr [eax + 0x18], edx
            //   8b491c               | mov                 ecx, dword ptr [ecx + 0x1c]
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx

        $sequence_2 = { eb02 33f6 c1e208 0fb6c8 0bd1 c1e208 }
            // n = 6, score = 400
            //   eb02                 | jmp                 4
            //   33f6                 | xor                 esi, esi
            //   c1e208               | shl                 edx, 8
            //   0fb6c8               | movzx               ecx, al
            //   0bd1                 | or                  edx, ecx
            //   c1e208               | shl                 edx, 8

        $sequence_3 = { 8b45f8 8b8870020000 ffd1 8945f4 837df400 751f }
            // n = 6, score = 400
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b8870020000         | mov                 ecx, dword ptr [eax + 0x270]
            //   ffd1                 | call                ecx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   751f                 | jne                 0x21

        $sequence_4 = { 42 3bf9 0f84a8000000 81ef00400000 3b7d10 }
            // n = 5, score = 400
            //   42                   | inc                 edx
            //   3bf9                 | cmp                 edi, ecx
            //   0f84a8000000         | je                  0xae
            //   81ef00400000         | sub                 edi, 0x4000
            //   3b7d10               | cmp                 edi, dword ptr [ebp + 0x10]

        $sequence_5 = { 8b5508 52 8b45f8 8b8870020000 }
            // n = 4, score = 400
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   52                   | push                edx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b8870020000         | mov                 ecx, dword ptr [eax + 0x270]

        $sequence_6 = { 751f 837d08ff 7519 837d0c22 7513 }
            // n = 5, score = 400
            //   751f                 | jne                 0x21
            //   837d08ff             | cmp                 dword ptr [ebp + 8], -1
            //   7519                 | jne                 0x1b
            //   837d0c22             | cmp                 dword ptr [ebp + 0xc], 0x22
            //   7513                 | jne                 0x15

        $sequence_7 = { 8b08 83c930 8b55fc 890a 8b45f4 8be5 }
            // n = 6, score = 400
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   83c930               | or                  ecx, 0x30
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   890a                 | mov                 dword ptr [edx], ecx
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   8be5                 | mov                 esp, ebp

        $sequence_8 = { e8???????? 58 8945f8 8b45f8 2500f0ffff }
            // n = 5, score = 400
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   2500f0ffff           | and                 eax, 0xfffff000

        $sequence_9 = { 8b45f8 2500f0ffff 8945f8 8b4d18 51 8b5514 }
            // n = 6, score = 400
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   2500f0ffff           | and                 eax, 0xfffff000
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b4d18               | mov                 ecx, dword ptr [ebp + 0x18]
            //   51                   | push                ecx
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]

        $sequence_10 = { 8801 8a4701 41 8801 }
            // n = 4, score = 400
            //   8801                 | mov                 byte ptr [ecx], al
            //   8a4701               | mov                 al, byte ptr [edi + 1]
            //   41                   | inc                 ecx
            //   8801                 | mov                 byte ptr [ecx], al

        $sequence_11 = { 55 8bec 837d0801 7c07 }
            // n = 4, score = 400
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   837d0801             | cmp                 dword ptr [ebp + 8], 1
            //   7c07                 | jl                  9

        $sequence_12 = { 8b4508 2bc2 83f801 0f82bb000000 803a00 74e6 }
            // n = 6, score = 400
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   2bc2                 | sub                 eax, edx
            //   83f801               | cmp                 eax, 1
            //   0f82bb000000         | jb                  0xc1
            //   803a00               | cmp                 byte ptr [edx], 0
            //   74e6                 | je                  0xffffffe8

        $sequence_13 = { 837d0c22 7513 8b5510 8955fc 8b45fc }
            // n = 5, score = 400
            //   837d0c22             | cmp                 dword ptr [ebp + 0xc], 0x22
            //   7513                 | jne                 0x15
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_14 = { 33c0 83c104 83f928 72da 84db 7418 0fb6c3 }
            // n = 7, score = 400
            //   33c0                 | xor                 eax, eax
            //   83c104               | add                 ecx, 4
            //   83f928               | cmp                 ecx, 0x28
            //   72da                 | jb                  0xffffffdc
            //   84db                 | test                bl, bl
            //   7418                 | je                  0x1a
            //   0fb6c3               | movzx               eax, bl

        $sequence_15 = { 8bcf 0f822fffffff 895d08 8bd9 c1eb10 }
            // n = 5, score = 400
            //   8bcf                 | mov                 ecx, edi
            //   0f822fffffff         | jb                  0xffffff35
            //   895d08               | mov                 dword ptr [ebp + 8], ebx
            //   8bd9                 | mov                 ebx, ecx
            //   c1eb10               | shr                 ebx, 0x10

    condition:
        7 of them and filesize < 1212416
}