rule win_fanny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { 33c0 e9???????? 57 e8???????? 8bd8 }
            // n = 5, score = 200
            //   33c0                 | xor                 eax, eax
            //   e9????????           |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax

        $sequence_1 = { 51 ff15???????? 8985ccfdffff 83bdccfdffff00 7505 e9???????? }
            // n = 6, score = 200
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   8985ccfdffff         | mov                 dword ptr [ebp - 0x234], eax
            //   83bdccfdffff00       | cmp                 dword ptr [ebp - 0x234], 0
            //   7505                 | jne                 7
            //   e9????????           |                     

        $sequence_2 = { 7502 eb52 8d95c8fdffff 52 6a00 }
            // n = 5, score = 200
            //   7502                 | jne                 4
            //   eb52                 | jmp                 0x54
            //   8d95c8fdffff         | lea                 edx, [ebp - 0x238]
            //   52                   | push                edx
            //   6a00                 | push                0

        $sequence_3 = { aa 89b5d8fdffff 89b5d4fdffff 89b5e0fdffff 8b7d08 }
            // n = 5, score = 200
            //   aa                   | stosb               byte ptr es:[edi], al
            //   89b5d8fdffff         | mov                 dword ptr [ebp - 0x228], esi
            //   89b5d4fdffff         | mov                 dword ptr [ebp - 0x22c], esi
            //   89b5e0fdffff         | mov                 dword ptr [ebp - 0x220], esi
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]

        $sequence_4 = { 57 ff35???????? ffd6 3bc3 8b1d???????? 742c 3dea000000 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   ff35????????         |                     
            //   ffd6                 | call                esi
            //   3bc3                 | cmp                 eax, ebx
            //   8b1d????????         |                     
            //   742c                 | je                  0x2e
            //   3dea000000           | cmp                 eax, 0xea

        $sequence_5 = { 8b4dfc 8b11 52 ff15???????? 85c0 7502 eb17 }
            // n = 7, score = 200
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   52                   | push                edx
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7502                 | jne                 4
            //   eb17                 | jmp                 0x19

        $sequence_6 = { 50 8d45f0 50 8d85ecfbffff 57 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   8d45f0               | lea                 eax, [ebp - 0x10]
            //   50                   | push                eax
            //   8d85ecfbffff         | lea                 eax, [ebp - 0x414]
            //   57                   | push                edi

        $sequence_7 = { ff75fc ff7508 ffd6 83f8ff 0f84a5000000 8d45f8 6a00 }
            // n = 7, score = 200
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ffd6                 | call                esi
            //   83f8ff               | cmp                 eax, -1
            //   0f84a5000000         | je                  0xab
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   6a00                 | push                0

        $sequence_8 = { 8901 c3 a1???????? 56 6a14 85c0 5e }
            // n = 7, score = 200
            //   8901                 | mov                 dword ptr [ecx], eax
            //   c3                   | ret                 
            //   a1????????           |                     
            //   56                   | push                esi
            //   6a14                 | push                0x14
            //   85c0                 | test                eax, eax
            //   5e                   | pop                 esi

        $sequence_9 = { 8b4dc8 0fb65101 81faff000000 750e 8b45c8 0fb64802 83f925 }
            // n = 7, score = 200
            //   8b4dc8               | mov                 ecx, dword ptr [ebp - 0x38]
            //   0fb65101             | movzx               edx, byte ptr [ecx + 1]
            //   81faff000000         | cmp                 edx, 0xff
            //   750e                 | jne                 0x10
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   0fb64802             | movzx               ecx, byte ptr [eax + 2]
            //   83f925               | cmp                 ecx, 0x25

        $sequence_10 = { 6a58 50 53 e8???????? 8b45fc 56 }
            // n = 6, score = 200
            //   6a58                 | push                0x58
            //   50                   | push                eax
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   56                   | push                esi

        $sequence_11 = { ffd6 8985bcfdffff 83bdb8fdffff00 7456 85c0 }
            // n = 5, score = 200
            //   ffd6                 | call                esi
            //   8985bcfdffff         | mov                 dword ptr [ebp - 0x244], eax
            //   83bdb8fdffff00       | cmp                 dword ptr [ebp - 0x248], 0
            //   7456                 | je                  0x58
            //   85c0                 | test                eax, eax

        $sequence_12 = { 752c 8b4508 0fb64802 81f9e8000000 751d 8b5508 0fb64207 }
            // n = 7, score = 200
            //   752c                 | jne                 0x2e
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   0fb64802             | movzx               ecx, byte ptr [eax + 2]
            //   81f9e8000000         | cmp                 ecx, 0xe8
            //   751d                 | jne                 0x1f
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   0fb64207             | movzx               eax, byte ptr [edx + 7]

        $sequence_13 = { 8b4dfc 2b4d08 894dc4 8b550c 0355c4 8955d4 }
            // n = 6, score = 200
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   2b4d08               | sub                 ecx, dword ptr [ebp + 8]
            //   894dc4               | mov                 dword ptr [ebp - 0x3c], ecx
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   0355c4               | add                 edx, dword ptr [ebp - 0x3c]
            //   8955d4               | mov                 dword ptr [ebp - 0x2c], edx

        $sequence_14 = { 895df0 c1ef05 8bc3 7468 6a20 5b 813e51504098 }
            // n = 7, score = 200
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   c1ef05               | shr                 edi, 5
            //   8bc3                 | mov                 eax, ebx
            //   7468                 | je                  0x6a
            //   6a20                 | push                0x20
            //   5b                   | pop                 ebx
            //   813e51504098         | cmp                 dword ptr [esi], 0x98405051

        $sequence_15 = { 6808100000 56 ffd7 fe45c6 8d45a8 50 6aff }
            // n = 7, score = 200
            //   6808100000           | push                0x1008
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   fe45c6               | inc                 byte ptr [ebp - 0x3a]
            //   8d45a8               | lea                 eax, [ebp - 0x58]
            //   50                   | push                eax
            //   6aff                 | push                -1

    condition:
        7 of them and filesize < 368640
}