rule win_sanny_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.sanny."
        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.sanny"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 8b5c2410 c1c20e 03d7 03d1 8bfa 33fe 23f9 }
            // n = 7, score = 100
            //   8b5c2410             | mov                 ebx, dword ptr [esp + 0x10]
            //   c1c20e               | rol                 edx, 0xe
            //   03d7                 | add                 edx, edi
            //   03d1                 | add                 edx, ecx
            //   8bfa                 | mov                 edi, edx
            //   33fe                 | xor                 edi, esi
            //   23f9                 | and                 edi, ecx

        $sequence_1 = { 8b54246c 52 68???????? 56 e8???????? 8b442478 8b4c2470 }
            // n = 7, score = 100
            //   8b54246c             | mov                 edx, dword ptr [esp + 0x6c]
            //   52                   | push                edx
            //   68????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b442478             | mov                 eax, dword ptr [esp + 0x78]
            //   8b4c2470             | mov                 ecx, dword ptr [esp + 0x70]

        $sequence_2 = { 51 8d0480 8d1480 8b842404120000 }
            // n = 4, score = 100
            //   51                   | push                ecx
            //   8d0480               | lea                 eax, [eax + eax*4]
            //   8d1480               | lea                 edx, [eax + eax*4]
            //   8b842404120000       | mov                 eax, dword ptr [esp + 0x1204]

        $sequence_3 = { 8d442422 6a7f 8d8e04c50000 50 51 55 8bce }
            // n = 7, score = 100
            //   8d442422             | lea                 eax, [esp + 0x22]
            //   6a7f                 | push                0x7f
            //   8d8e04c50000         | lea                 ecx, [esi + 0xc504]
            //   50                   | push                eax
            //   51                   | push                ecx
            //   55                   | push                ebp
            //   8bce                 | mov                 ecx, esi

        $sequence_4 = { ff35???????? ff15???????? 5e c3 55 8bec 81ec50040000 }
            // n = 7, score = 100
            //   ff35????????         |                     
            //   ff15????????         |                     
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81ec50040000         | sub                 esp, 0x450

        $sequence_5 = { 8bfd 6a1a 55 50 f3ab ff15???????? 85c0 }
            // n = 7, score = 100
            //   8bfd                 | mov                 edi, ebp
            //   6a1a                 | push                0x1a
            //   55                   | push                ebp
            //   50                   | push                eax
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_6 = { f2ae f7d1 2bf9 8d9424a0020000 }
            // n = 4, score = 100
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   8d9424a0020000       | lea                 edx, [esp + 0x2a0]

        $sequence_7 = { c1f805 83e21f 8b0485c0864100 8d04d0 eb05 b8???????? }
            // n = 6, score = 100
            //   c1f805               | sar                 eax, 5
            //   83e21f               | and                 edx, 0x1f
            //   8b0485c0864100       | mov                 eax, dword ptr [eax*4 + 0x4186c0]
            //   8d04d0               | lea                 eax, [eax + edx*8]
            //   eb05                 | jmp                 7
            //   b8????????           |                     

        $sequence_8 = { 53 56 57 8bfa 83c9ff 33c0 8b742418 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   56                   | push                esi
            //   57                   | push                edi
            //   8bfa                 | mov                 edi, edx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   8b742418             | mov                 esi, dword ptr [esp + 0x18]

        $sequence_9 = { 0fbe4c0474 51 68???????? 52 ffd5 8d442448 8d4c2454 }
            // n = 7, score = 100
            //   0fbe4c0474           | movsx               ecx, byte ptr [esp + eax + 0x74]
            //   51                   | push                ecx
            //   68????????           |                     
            //   52                   | push                edx
            //   ffd5                 | call                ebp
            //   8d442448             | lea                 eax, [esp + 0x48]
            //   8d4c2454             | lea                 ecx, [esp + 0x54]

    condition:
        7 of them and filesize < 253952
}