rule win_fanny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 8065fe00 66ab 6a32 aa ffd6 c645f863 }
            // n = 6, score = 200
            //   8065fe00             | and                 byte ptr [ebp - 2], 0
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   6a32                 | push                0x32
            //   aa                   | stosb               byte ptr es:[edi], al
            //   ffd6                 | call                esi
            //   c645f863             | mov                 byte ptr [ebp - 8], 0x63

        $sequence_1 = { 51 8d442400 c7442400ffffffff 50 68???????? ff15???????? }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   8d442400             | lea                 eax, [esp]
            //   c7442400ffffffff     | mov                 dword ptr [esp], 0xffffffff
            //   50                   | push                eax
            //   68????????           |                     
            //   ff15????????         |                     

        $sequence_2 = { eb23 8b5508 0fb602 3de9000000 7516 837d0c00 7410 }
            // n = 7, score = 200
            //   eb23                 | jmp                 0x25
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0fb602               | movzx               eax, byte ptr [edx]
            //   3de9000000           | cmp                 eax, 0xe9
            //   7516                 | jne                 0x18
            //   837d0c00             | cmp                 dword ptr [ebp + 0xc], 0
            //   7410                 | je                  0x12

        $sequence_3 = { 50 57 ff15???????? 8d74240c b8???????? 8a10 8a1e }
            // n = 7, score = 200
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8d74240c             | lea                 esi, [esp + 0xc]
            //   b8????????           |                     
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   8a1e                 | mov                 bl, byte ptr [esi]

        $sequence_4 = { ff750c e8???????? 8b1d???????? 59 8b45f0 }
            // n = 5, score = 200
            //   ff750c               | push                dword ptr [ebp + 0xc]
            //   e8????????           |                     
            //   8b1d????????         |                     
            //   59                   | pop                 ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_5 = { 83a5bcfdffff00 6a01 53 8b35???????? }
            // n = 4, score = 200
            //   83a5bcfdffff00       | and                 dword ptr [ebp - 0x244], 0
            //   6a01                 | push                1
            //   53                   | push                ebx
            //   8b35????????         |                     

        $sequence_6 = { 7412 0fb655cf 83fa64 7409 0fb645cf }
            // n = 5, score = 200
            //   7412                 | je                  0x14
            //   0fb655cf             | movzx               edx, byte ptr [ebp - 0x31]
            //   83fa64               | cmp                 edx, 0x64
            //   7409                 | je                  0xb
            //   0fb645cf             | movzx               eax, byte ptr [ebp - 0x31]

        $sequence_7 = { 8d45fc 50 8d85f8fdffff 50 8d45f8 50 6a00 }
            // n = 7, score = 200
            //   8d45fc               | lea                 eax, [ebp - 4]
            //   50                   | push                eax
            //   8d85f8fdffff         | lea                 eax, [ebp - 0x208]
            //   50                   | push                eax
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   6a00                 | push                0

        $sequence_8 = { 8b0d???????? 894dc4 668b15???????? 668955c8 8d45c4 8945ac }
            // n = 6, score = 200
            //   8b0d????????         |                     
            //   894dc4               | mov                 dword ptr [ebp - 0x3c], ecx
            //   668b15????????       |                     
            //   668955c8             | mov                 word ptr [ebp - 0x38], dx
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   8945ac               | mov                 dword ptr [ebp - 0x54], eax

        $sequence_9 = { e9???????? 837d1000 751a ba???????? }
            // n = 4, score = 200
            //   e9????????           |                     
            //   837d1000             | cmp                 dword ptr [ebp + 0x10], 0
            //   751a                 | jne                 0x1c
            //   ba????????           |                     

        $sequence_10 = { 81c709010000 8d443011 50 57 }
            // n = 4, score = 200
            //   81c709010000         | add                 edi, 0x109
            //   8d443011             | lea                 eax, [eax + esi + 0x11]
            //   50                   | push                eax
            //   57                   | push                edi

        $sequence_11 = { 751a ba???????? 81ea???????? 8b85ccfdffff }
            // n = 4, score = 200
            //   751a                 | jne                 0x1c
            //   ba????????           |                     
            //   81ea????????         |                     
            //   8b85ccfdffff         | mov                 eax, dword ptr [ebp - 0x234]

        $sequence_12 = { 7423 8d85d8fdffff 50 8d85d4fdffff 50 }
            // n = 5, score = 200
            //   7423                 | je                  0x25
            //   8d85d8fdffff         | lea                 eax, [ebp - 0x228]
            //   50                   | push                eax
            //   8d85d4fdffff         | lea                 eax, [ebp - 0x22c]
            //   50                   | push                eax

        $sequence_13 = { ffd6 3bfb 8be8 0f84f2010000 3beb 0f84ea010000 8b442420 }
            // n = 7, score = 200
            //   ffd6                 | call                esi
            //   3bfb                 | cmp                 edi, ebx
            //   8be8                 | mov                 ebp, eax
            //   0f84f2010000         | je                  0x1f8
            //   3beb                 | cmp                 ebp, ebx
            //   0f84ea010000         | je                  0x1f0
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]

        $sequence_14 = { 56 ff35???????? ffd7 85c0 7456 53 }
            // n = 6, score = 200
            //   56                   | push                esi
            //   ff35????????         |                     
            //   ffd7                 | call                edi
            //   85c0                 | test                eax, eax
            //   7456                 | je                  0x58
            //   53                   | push                ebx

        $sequence_15 = { ffd6 ffd6 6804010000 8be8 e8???????? }
            // n = 5, score = 200
            //   ffd6                 | call                esi
            //   ffd6                 | call                esi
            //   6804010000           | push                0x104
            //   8be8                 | mov                 ebp, eax
            //   e8????????           |                     

    condition:
        7 of them and filesize < 368640
}