rule win_lambert_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 33f2 8b55e8 33ce 33d1 }
            // n = 4, score = 400
            //   33f2                 | xor                 esi, edx
            //   8b55e8               | mov                 edx, dword ptr [ebp - 0x18]
            //   33ce                 | xor                 ecx, esi
            //   33d1                 | xor                 edx, ecx

        $sequence_1 = { 3b7d10 724d 3bf9 7349 8bc3 }
            // n = 5, score = 400
            //   3b7d10               | cmp                 edi, dword ptr [ebp + 0x10]
            //   724d                 | jb                  0x4f
            //   3bf9                 | cmp                 edi, ecx
            //   7349                 | jae                 0x4b
            //   8bc3                 | mov                 eax, ebx

        $sequence_2 = { 0bd1 c1e208 0bd1 c1e208 0bd6 }
            // n = 5, score = 400
            //   0bd1                 | or                  edx, ecx
            //   c1e208               | shl                 edx, 8
            //   0bd1                 | or                  edx, ecx
            //   c1e208               | shl                 edx, 8
            //   0bd6                 | or                  edx, esi

        $sequence_3 = { 3bd8 0f82a4000000 83fe06 0f822cffffff }
            // n = 4, score = 400
            //   3bd8                 | cmp                 ebx, eax
            //   0f82a4000000         | jb                  0xaa
            //   83fe06               | cmp                 esi, 6
            //   0f822cffffff         | jb                  0xffffff32

        $sequence_4 = { 33f1 8b4de4 33ce 314de8 }
            // n = 4, score = 400
            //   33f1                 | xor                 esi, ecx
            //   8b4de4               | mov                 ecx, dword ptr [ebp - 0x1c]
            //   33ce                 | xor                 ecx, esi
            //   314de8               | xor                 dword ptr [ebp - 0x18], ecx

        $sequence_5 = { 2bc1 3bc7 0f82e5010000 8b4508 2bc2 8d7701 3bc6 }
            // n = 7, score = 400
            //   2bc1                 | sub                 eax, ecx
            //   3bc7                 | cmp                 eax, edi
            //   0f82e5010000         | jb                  0x1eb
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   2bc2                 | sub                 eax, edx
            //   8d7701               | lea                 esi, [edi + 1]
            //   3bc6                 | cmp                 eax, esi

        $sequence_6 = { 3bd8 0f826f010000 8a07 8801 41 47 }
            // n = 6, score = 400
            //   3bd8                 | cmp                 ebx, eax
            //   0f826f010000         | jb                  0x175
            //   8a07                 | mov                 al, byte ptr [edi]
            //   8801                 | mov                 byte ptr [ecx], al
            //   41                   | inc                 ecx
            //   47                   | inc                 edi

        $sequence_7 = { 4e 8b1f 8919 2bf0 }
            // n = 4, score = 400
            //   4e                   | dec                 esi
            //   8b1f                 | mov                 ebx, dword ptr [edi]
            //   8919                 | mov                 dword ptr [ecx], ebx
            //   2bf0                 | sub                 esi, eax

        $sequence_8 = { 64a130000000 8945fc 8b4dfc 8b510c 8b421c 8945f4 8b4df4 }
            // n = 7, score = 300
            //   64a130000000         | mov                 eax, dword ptr fs:[0x30]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b510c               | mov                 edx, dword ptr [ecx + 0xc]
            //   8b421c               | mov                 eax, dword ptr [edx + 0x1c]
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_9 = { 0fb711 81fa4d5a0000 7402 eb79 }
            // n = 4, score = 300
            //   0fb711               | movzx               edx, word ptr [ecx]
            //   81fa4d5a0000         | cmp                 edx, 0x5a4d
            //   7402                 | je                  4
            //   eb79                 | jmp                 0x7b

        $sequence_10 = { 8b55fc 3b5118 7334 8b45fc }
            // n = 4, score = 300
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   3b5118               | cmp                 edx, dword ptr [ecx + 0x18]
            //   7334                 | jae                 0x36
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

        $sequence_11 = { 8945f8 8b4df8 3b4d08 7508 8b55f4 }
            // n = 5, score = 300
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   3b4d08               | cmp                 ecx, dword ptr [ebp + 8]
            //   7508                 | jne                 0xa
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]

        $sequence_12 = { 731b 8b45e8 8b4d08 03481c }
            // n = 4, score = 300
            //   731b                 | jae                 0x1d
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   03481c               | add                 ecx, dword ptr [eax + 0x1c]

        $sequence_13 = { 83f95a 7f09 0fb74508 83c020 eb04 668b4508 }
            // n = 6, score = 300
            //   83f95a               | cmp                 ecx, 0x5a
            //   7f09                 | jg                  0xb
            //   0fb74508             | movzx               eax, word ptr [ebp + 8]
            //   83c020               | add                 eax, 0x20
            //   eb04                 | jmp                 6
            //   668b4508             | mov                 ax, word ptr [ebp + 8]

        $sequence_14 = { 51 e8???????? 0fb7d0 0355f8 8955f8 ebc5 }
            // n = 6, score = 300
            //   51                   | push                ecx
            //   e8????????           |                     
            //   0fb7d0               | movzx               edx, ax
            //   0355f8               | add                 edx, dword ptr [ebp - 8]
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   ebc5                 | jmp                 0xffffffc7

        $sequence_15 = { 0bca 894df8 8b45fc 0fb708 }
            // n = 4, score = 300
            //   0bca                 | or                  ecx, edx
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   0fb708               | movzx               ecx, word ptr [eax]

    condition:
        7 of them and filesize < 1212416
}