rule win_fanny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-08-05"
        version = "1"
        description = "Detects win.fanny."
        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.fanny"
        malpedia_rule_date = "20220805"
        malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71"
        malpedia_version = "20220808"
        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 = { 0fb64dcf 83f926 742d 0fb655cf 83fa2e 7424 0fb645cf }
            // n = 7, score = 200
            //   0fb64dcf             | movzx               ecx, byte ptr [ebp - 0x31]
            //   83f926               | cmp                 ecx, 0x26
            //   742d                 | je                  0x2f
            //   0fb655cf             | movzx               edx, byte ptr [ebp - 0x31]
            //   83fa2e               | cmp                 edx, 0x2e
            //   7424                 | je                  0x26
            //   0fb645cf             | movzx               eax, byte ptr [ebp - 0x31]

        $sequence_1 = { 8b5508 0fb64201 83f825 7513 8b4d08 }
            // n = 5, score = 200
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0fb64201             | movzx               eax, byte ptr [edx + 1]
            //   83f825               | cmp                 eax, 0x25
            //   7513                 | jne                 0x15
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

        $sequence_2 = { 898590fbffff 8b0d???????? 898d94fbffff 668b15???????? 66899598fbffff }
            // n = 5, score = 200
            //   898590fbffff         | mov                 dword ptr [ebp - 0x470], eax
            //   8b0d????????         |                     
            //   898d94fbffff         | mov                 dword ptr [ebp - 0x46c], ecx
            //   668b15????????       |                     
            //   66899598fbffff       | mov                 word ptr [ebp - 0x468], dx

        $sequence_3 = { ffd6 6804010000 8be8 e8???????? 8bf0 }
            // n = 5, score = 200
            //   ffd6                 | call                esi
            //   6804010000           | push                0x104
            //   8be8                 | mov                 ebp, eax
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_4 = { 8b45f0 2b45f4 0faf45f8 0faf45fc }
            // n = 4, score = 200
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   2b45f4               | sub                 eax, dword ptr [ebp - 0xc]
            //   0faf45f8             | imul                eax, dword ptr [ebp - 8]
            //   0faf45fc             | imul                eax, dword ptr [ebp - 4]

        $sequence_5 = { 59 8b45f0 3bc7 0f86c7000000 8b4dec 8945f0 }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   3bc7                 | cmp                 eax, edi
            //   0f86c7000000         | jbe                 0xcd
            //   8b4dec               | mov                 ecx, dword ptr [ebp - 0x14]
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax

        $sequence_6 = { 750f 8d859cfdffff 56 50 e8???????? }
            // n = 5, score = 200
            //   750f                 | jne                 0x11
            //   8d859cfdffff         | lea                 eax, [ebp - 0x264]
            //   56                   | push                esi
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_7 = { ff15???????? a1???????? 5e 885845 eb03 6a01 5f }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   a1????????           |                     
            //   5e                   | pop                 esi
            //   885845               | mov                 byte ptr [eax + 0x45], bl
            //   eb03                 | jmp                 5
            //   6a01                 | push                1
            //   5f                   | pop                 edi

        $sequence_8 = { c9 c3 a0???????? 6a00 50 }
            // n = 5, score = 200
            //   c9                   | leave               
            //   c3                   | ret                 
            //   a0????????           |                     
            //   6a00                 | push                0
            //   50                   | push                eax

        $sequence_9 = { ff7508 c745fc40000000 ff15???????? 85c0 8bf8 7503 8b7df8 }
            // n = 7, score = 200
            //   ff7508               | push                dword ptr [ebp + 8]
            //   c745fc40000000       | mov                 dword ptr [ebp - 4], 0x40
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   8bf8                 | mov                 edi, eax
            //   7503                 | jne                 5
            //   8b7df8               | mov                 edi, dword ptr [ebp - 8]

        $sequence_10 = { 6a08 50 50 ff15???????? }
            // n = 4, score = 200
            // 
            //   50                   | push                eax
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_11 = { 85f6 7436 807c241020 732b 0fb6442410 50 }
            // n = 6, score = 200
            //   85f6                 | test                esi, esi
            //   7436                 | je                  0x38
            //   807c241020           | cmp                 byte ptr [esp + 0x10], 0x20
            //   732b                 | jae                 0x2d
            //   0fb6442410           | movzx               eax, byte ptr [esp + 0x10]
            //   50                   | push                eax

        $sequence_12 = { 8955d4 ebd2 8b45c4 3b45d0 741f }
            // n = 5, score = 200
            //   8955d4               | mov                 dword ptr [ebp - 0x2c], edx
            //   ebd2                 | jmp                 0xffffffd4
            //   8b45c4               | mov                 eax, dword ptr [ebp - 0x3c]
            //   3b45d0               | cmp                 eax, dword ptr [ebp - 0x30]
            //   741f                 | je                  0x21

        $sequence_13 = { 8d0c51 8b550c 0fafc8 890a 0fb64dc9 0fafc8 8b4510 }
            // n = 7, score = 200
            //   8d0c51               | lea                 ecx, [ecx + edx*2]
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   0fafc8               | imul                ecx, eax
            //   890a                 | mov                 dword ptr [edx], ecx
            //   0fb64dc9             | movzx               ecx, byte ptr [ebp - 0x37]
            //   0fafc8               | imul                ecx, eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]

        $sequence_14 = { 0fb645cf 83f865 751d 8b4dc8 }
            // n = 4, score = 200
            //   0fb645cf             | movzx               eax, byte ptr [ebp - 0x31]
            //   83f865               | cmp                 eax, 0x65
            //   751d                 | jne                 0x1f
            //   8b4dc8               | mov                 ecx, dword ptr [ebp - 0x38]

        $sequence_15 = { ffd7 fe45c6 8d55a8 52 6aff }
            // n = 5, score = 200
            //   ffd7                 | call                edi
            //   fe45c6               | inc                 byte ptr [ebp - 0x3a]
            //   8d55a8               | lea                 edx, [ebp - 0x58]
            //   52                   | push                edx
            //   6aff                 | push                -1

    condition:
        7 of them and filesize < 368640
}