rule win_fanny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "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 = { ff35???????? ffd6 e8???????? e8???????? e8???????? }
            // n = 5, score = 200
            //   ff35????????         |                     
            //   ffd6                 | call                esi
            //   e8????????           |                     
            //   e8????????           |                     
            //   e8????????           |                     

        $sequence_1 = { 83f8ff 740a 53 50 }
            // n = 4, score = 200
            //   83f8ff               | cmp                 eax, -1
            //   740a                 | je                  0xc
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_2 = { 53 eb0b 8b4704 83c708 }
            // n = 4, score = 200
            //   53                   | push                ebx
            //   eb0b                 | jmp                 0xd
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   83c708               | add                 edi, 8

        $sequence_3 = { 59 8bf0 59 33c9 3bf1 745c 8b542414 }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   8bf0                 | mov                 esi, eax
            //   59                   | pop                 ecx
            //   33c9                 | xor                 ecx, ecx
            //   3bf1                 | cmp                 esi, ecx
            //   745c                 | je                  0x5e
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]

        $sequence_4 = { 55 8bec 837d0c00 742e 8b450c }
            // n = 5, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   742e                 | je                  0x30
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]

        $sequence_5 = { 8945d4 c745c400000000 8b4dc4 3b4dd0 7d26 }
            // n = 5, score = 200
            //   8945d4               | mov                 dword ptr [ebp - 0x2c], eax
            //   c745c400000000       | mov                 dword ptr [ebp - 0x3c], 0
            //   8b4dc4               | mov                 ecx, dword ptr [ebp - 0x3c]
            //   3b4dd0               | cmp                 ecx, dword ptr [ebp - 0x30]
            //   7d26                 | jge                 0x28

        $sequence_6 = { c7460811000000 894604 8a0d???????? 50 884e10 ff75fc }
            // n = 6, score = 200
            //   c7460811000000       | mov                 dword ptr [esi + 8], 0x11
            //   894604               | mov                 dword ptr [esi + 4], eax
            //   8a0d????????         |                     
            //   50                   | push                eax
            //   884e10               | mov                 byte ptr [esi + 0x10], cl
            //   ff75fc               | push                dword ptr [ebp - 4]

        $sequence_7 = { 8b742410 57 8b7c2410 56 57 e8???????? 83c408 }
            // n = 7, score = 200
            //   8b742410             | mov                 esi, dword ptr [esp + 0x10]
            //   57                   | push                edi
            //   8b7c2410             | mov                 edi, dword ptr [esp + 0x10]
            //   56                   | push                esi
            //   57                   | push                edi
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_8 = { ffd6 85c0 752b 397dfc 7526 8d45fc 8b3d???????? }
            // n = 7, score = 200
            //   ffd6                 | call                esi
            //   85c0                 | test                eax, eax
            //   752b                 | jne                 0x2d
            //   397dfc               | cmp                 dword ptr [ebp - 4], edi
            //   7526                 | jne                 0x28
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   8b3d????????         |                     

        $sequence_9 = { 8b4510 832000 33c0 e9???????? ff761c }
            // n = 5, score = 200
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   832000               | and                 dword ptr [eax], 0
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   ff761c               | push                dword ptr [esi + 0x1c]

        $sequence_10 = { 885e15 897e11 380d???????? 750f 50 56 e8???????? }
            // n = 7, score = 200
            //   885e15               | mov                 byte ptr [esi + 0x15], bl
            //   897e11               | mov                 dword ptr [esi + 0x11], edi
            //   380d????????         |                     
            //   750f                 | jne                 0x11
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_11 = { 7417 8b4514 50 8b4d10 51 }
            // n = 5, score = 200
            //   7417                 | je                  0x19
            //   8b4514               | mov                 eax, dword ptr [ebp + 0x14]
            //   50                   | push                eax
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx

        $sequence_12 = { 53 50 6808100000 56 ffd7 fe45c6 8d55a8 }
            // n = 7, score = 200
            //   53                   | push                ebx
            //   50                   | push                eax
            //   6808100000           | push                0x1008
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   fe45c6               | inc                 byte ptr [ebp - 0x3a]
            //   8d55a8               | lea                 edx, [ebp - 0x58]

        $sequence_13 = { c745b000000000 8d4dec e8???????? 8d4dd8 e8???????? 8b45b0 eb1a }
            // n = 7, score = 200
            //   c745b000000000       | mov                 dword ptr [ebp - 0x50], 0
            //   8d4dec               | lea                 ecx, [ebp - 0x14]
            //   e8????????           |                     
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   e8????????           |                     
            //   8b45b0               | mov                 eax, dword ptr [ebp - 0x50]
            //   eb1a                 | jmp                 0x1c

        $sequence_14 = { eb03 8b7508 8bc6 5f }
            // n = 4, score = 200
            //   eb03                 | jmp                 5
            //   8b7508               | mov                 esi, dword ptr [ebp + 8]
            //   8bc6                 | mov                 eax, esi
            //   5f                   | pop                 edi

        $sequence_15 = { 68???????? 8b95ccfdffff 52 8b4508 50 ff15???????? 85c0 }
            // n = 7, score = 200
            //   68????????           |                     
            //   8b95ccfdffff         | mov                 edx, dword ptr [ebp - 0x234]
            //   52                   | push                edx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 368640
}