rule win_lambert_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 8945f4 837df400 751f 837d08ff 7519 }
            // n = 5, score = 400
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0
            //   751f                 | jne                 0x21
            //   837d08ff             | cmp                 dword ptr [ebp + 8], -1
            //   7519                 | jne                 0x1b

        $sequence_1 = { 8955fc 8b45fc 8b08 83c930 }
            // n = 4, score = 400
            //   8955fc               | mov                 dword ptr [ebp - 4], edx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   83c930               | or                  ecx, 0x30

        $sequence_2 = { 334df0 83c220 314df8 894af0 894df4 8b4df8 }
            // n = 6, score = 400
            //   334df0               | xor                 ecx, dword ptr [ebp - 0x10]
            //   83c220               | add                 edx, 0x20
            //   314df8               | xor                 dword ptr [ebp - 8], ecx
            //   894af0               | mov                 dword ptr [edx - 0x10], ecx
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]

        $sequence_3 = { 8b5508 52 8b45f8 8b8870020000 ffd1 8945f4 837df400 }
            // n = 7, 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]
            //   ffd1                 | call                ecx
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   837df400             | cmp                 dword ptr [ebp - 0xc], 0

        $sequence_4 = { 837d08ff 7519 837d0c22 7513 }
            // n = 4, score = 400
            //   837d08ff             | cmp                 dword ptr [ebp + 8], -1
            //   7519                 | jne                 0x1b
            //   837d0c22             | cmp                 dword ptr [ebp + 0xc], 0x22
            //   7513                 | jne                 0x15

        $sequence_5 = { c1e810 0fb6f8 8972fc 895a08 8bcb }
            // n = 5, score = 400
            //   c1e810               | shr                 eax, 0x10
            //   0fb6f8               | movzx               edi, al
            //   8972fc               | mov                 dword ptr [edx - 4], esi
            //   895a08               | mov                 dword ptr [edx + 8], ebx
            //   8bcb                 | mov                 ecx, ebx

        $sequence_6 = { 8bec 83ec0c e8???????? 58 8945f8 }
            // n = 5, score = 400
            //   8bec                 | mov                 ebp, esp
            //   83ec0c               | sub                 esp, 0xc
            //   e8????????           |                     
            //   58                   | pop                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $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 = { 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_9 = { 2bd9 8d4602 3bd8 0f82a4000000 83fe06 0f822cffffff }
            // n = 6, score = 400
            //   2bd9                 | sub                 ebx, ecx
            //   8d4602               | lea                 eax, [esi + 2]
            //   3bd8                 | cmp                 ebx, eax
            //   0f82a4000000         | jb                  0xaa
            //   83fe06               | cmp                 esi, 6
            //   0f822cffffff         | jb                  0xffffff32

        $sequence_10 = { 42 0fb702 c1e802 2bf8 42 }
            // n = 5, score = 400
            //   42                   | inc                 edx
            //   0fb702               | movzx               eax, word ptr [edx]
            //   c1e802               | shr                 eax, 2
            //   2bf8                 | sub                 edi, eax
            //   42                   | inc                 edx

        $sequence_11 = { 40 e9???????? 8b4508 8b4804 334f04 53 }
            // n = 6, score = 400
            //   40                   | inc                 eax
            //   e9????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   334f04               | xor                 ecx, dword ptr [edi + 4]
            //   53                   | push                ebx

        $sequence_12 = { 83f928 72da 84db 7418 }
            // n = 4, score = 400
            //   83f928               | cmp                 ecx, 0x28
            //   72da                 | jb                  0xffffffdc
            //   84db                 | test                bl, bl
            //   7418                 | je                  0x1a

        $sequence_13 = { 837d0c22 7513 8b5510 8955fc }
            // n = 4, 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

        $sequence_14 = { 0f8c1fffffff 8b07 8901 6a04 }
            // n = 4, score = 400
            //   0f8c1fffffff         | jl                  0xffffff25
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8901                 | mov                 dword ptr [ecx], eax
            //   6a04                 | push                4

        $sequence_15 = { 2bf8 4f 42 42 }
            // n = 4, score = 400
            //   2bf8                 | sub                 edi, eax
            //   4f                   | dec                 edi
            //   42                   | inc                 edx
            //   42                   | inc                 edx

    condition:
        7 of them and filesize < 1212416
}