rule win_iispy_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.iispy."
        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.iispy"
        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 = { 3b4608 7472 8a10 80fa30 7c6b 80fa39 7f66 }
            // n = 7, score = 100
            //   3b4608               | cmp                 eax, dword ptr [esi + 8]
            //   7472                 | je                  0x74
            //   8a10                 | mov                 dl, byte ptr [eax]
            //   80fa30               | cmp                 dl, 0x30
            //   7c6b                 | jl                  0x6d
            //   80fa39               | cmp                 dl, 0x39
            //   7f66                 | jg                  0x68

        $sequence_1 = { c1c017 03c1 8bc8 894204 8b420c }
            // n = 5, score = 100
            //   c1c017               | rol                 eax, 0x17
            //   03c1                 | add                 eax, ecx
            //   8bc8                 | mov                 ecx, eax
            //   894204               | mov                 dword ptr [edx + 4], eax
            //   8b420c               | mov                 eax, dword ptr [edx + 0xc]

        $sequence_2 = { ff75c8 ff75c4 ff75c0 ff36 6a00 ff15???????? b901000000 }
            // n = 7, score = 100
            //   ff75c8               | push                dword ptr [ebp - 0x38]
            //   ff75c4               | push                dword ptr [ebp - 0x3c]
            //   ff75c0               | push                dword ptr [ebp - 0x40]
            //   ff36                 | push                dword ptr [esi]
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   b901000000           | mov                 ecx, 1

        $sequence_3 = { 8802 eb02 883a 3b7d0c 0f826affffff 8b16 5f }
            // n = 7, score = 100
            //   8802                 | mov                 byte ptr [edx], al
            //   eb02                 | jmp                 4
            //   883a                 | mov                 byte ptr [edx], bh
            //   3b7d0c               | cmp                 edi, dword ptr [ebp + 0xc]
            //   0f826affffff         | jb                  0xffffff70
            //   8b16                 | mov                 edx, dword ptr [esi]
            //   5f                   | pop                 edi

        $sequence_4 = { c20800 8b8c2424010000 33c0 5f 5e 33cc }
            // n = 6, score = 100
            //   c20800               | ret                 8
            //   8b8c2424010000       | mov                 ecx, dword ptr [esp + 0x124]
            //   33c0                 | xor                 eax, eax
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33cc                 | xor                 ecx, esp

        $sequence_5 = { c60165 5f 5e 8b4c241c 33cc e8???????? 8be5 }
            // n = 7, score = 100
            //   c60165               | mov                 byte ptr [ecx], 0x65
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8b4c241c             | mov                 ecx, dword ptr [esp + 0x1c]
            //   33cc                 | xor                 ecx, esp
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp

        $sequence_6 = { 7420 6bc618 57 8db818d10210 57 ff15???????? ff0d???????? }
            // n = 7, score = 100
            //   7420                 | je                  0x22
            //   6bc618               | imul                eax, esi, 0x18
            //   57                   | push                edi
            //   8db818d10210         | lea                 edi, [eax + 0x1002d118]
            //   57                   | push                edi
            //   ff15????????         |                     
            //   ff0d????????         |                     

        $sequence_7 = { 833d????????00 0f845c140000 83ec08 0fae5c2404 8b442404 25807f0000 3d801f0000 }
            // n = 7, score = 100
            //   833d????????00       |                     
            //   0f845c140000         | je                  0x1462
            //   83ec08               | sub                 esp, 8
            //   0fae5c2404           | stmxcsr             dword ptr [esp + 4]
            //   8b442404             | mov                 eax, dword ptr [esp + 4]
            //   25807f0000           | and                 eax, 0x7f80
            //   3d801f0000           | cmp                 eax, 0x1f80

        $sequence_8 = { eb3f 0fb600 0fbe8850c70210 41 894dd0 3bcf 0f8fa8010000 }
            // n = 7, score = 100
            //   eb3f                 | jmp                 0x41
            //   0fb600               | movzx               eax, byte ptr [eax]
            //   0fbe8850c70210       | movsx               ecx, byte ptr [eax + 0x1002c750]
            //   41                   | inc                 ecx
            //   894dd0               | mov                 dword ptr [ebp - 0x30], ecx
            //   3bcf                 | cmp                 ecx, edi
            //   0f8fa8010000         | jg                  0x1ae

        $sequence_9 = { 3c5a 7712 0fbec1 0faee8 0fb688f8eb0110 83e10f eb02 }
            // n = 7, score = 100
            //   3c5a                 | cmp                 al, 0x5a
            //   7712                 | ja                  0x14
            //   0fbec1               | movsx               eax, cl
            //   0faee8               | lfence              
            //   0fb688f8eb0110       | movzx               ecx, byte ptr [eax + 0x1001ebf8]
            //   83e10f               | and                 ecx, 0xf
            //   eb02                 | jmp                 4

    condition:
        7 of them and filesize < 397312
}