rule win_iisniff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.iisniff."
        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.iisniff"
        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 = { 8d4d01 8d742418 8bd7 e8???????? 6aff 53 }
            // n = 6, score = 200
            //   8d4d01               | lea                 ecx, [ebp + 1]
            //   8d742418             | lea                 esi, [esp + 0x18]
            //   8bd7                 | mov                 edx, edi
            //   e8????????           |                     
            //   6aff                 | push                -1
            //   53                   | push                ebx

        $sequence_1 = { 6a03 68000000c0 68???????? ff15???????? 6a02 }
            // n = 5, score = 200
            //   6a03                 | push                3
            //   68000000c0           | push                0xc0000000
            //   68????????           |                     
            //   ff15????????         |                     
            //   6a02                 | push                2

        $sequence_2 = { 8b9424a8000000 52 e8???????? 83c404 b801000000 5f }
            // n = 6, score = 200
            //   8b9424a8000000       | mov                 edx, dword ptr [esp + 0xa8]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   b801000000           | mov                 eax, 1
            //   5f                   | pop                 edi

        $sequence_3 = { 8b9424b0000000 52 e8???????? 83c404 8b442420 c78424c40000000f000000 }
            // n = 6, score = 200
            //   8b9424b0000000       | mov                 edx, dword ptr [esp + 0xb0]
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   c78424c40000000f000000     | mov    dword ptr [esp + 0xc4], 0xf

        $sequence_4 = { 8b442418 8b4004 397c0420 0f85ba010000 6a0a 8d4c041c 51 }
            // n = 7, score = 200
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   397c0420             | cmp                 dword ptr [esp + eax + 0x20], edi
            //   0f85ba010000         | jne                 0x1c0
            //   6a0a                 | push                0xa
            //   8d4c041c             | lea                 ecx, [esp + eax + 0x1c]
            //   51                   | push                ecx

        $sequence_5 = { ffd1 8b54240c 52 e8???????? 8b4f08 8b9780000000 83c404 }
            // n = 7, score = 200
            //   ffd1                 | call                ecx
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b4f08               | mov                 ecx, dword ptr [edi + 8]
            //   8b9780000000         | mov                 edx, dword ptr [edi + 0x80]
            //   83c404               | add                 esp, 4

        $sequence_6 = { 85c0 0f8560040000 391d???????? 0f8686020000 }
            // n = 4, score = 200
            //   85c0                 | test                eax, eax
            //   0f8560040000         | jne                 0x466
            //   391d????????         |                     
            //   0f8686020000         | jbe                 0x28c

        $sequence_7 = { e8???????? 8bc7 8b8c2418010000 64890d00000000 59 5f }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8bc7                 | mov                 eax, edi
            //   8b8c2418010000       | mov                 ecx, dword ptr [esp + 0x118]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi

        $sequence_8 = { 894628 897e2c e8???????? 884630 397e28 750a 57 }
            // n = 7, score = 200
            //   894628               | mov                 dword ptr [esi + 0x28], eax
            //   897e2c               | mov                 dword ptr [esi + 0x2c], edi
            //   e8????????           |                     
            //   884630               | mov                 byte ptr [esi + 0x30], al
            //   397e28               | cmp                 dword ptr [esi + 0x28], edi
            //   750a                 | jne                 0xc
            //   57                   | push                edi

        $sequence_9 = { 8bc8 ff5254 89442414 85c0 0f8c53010000 6a02 5e }
            // n = 7, score = 200
            //   8bc8                 | mov                 ecx, eax
            //   ff5254               | call                dword ptr [edx + 0x54]
            //   89442414             | mov                 dword ptr [esp + 0x14], eax
            //   85c0                 | test                eax, eax
            //   0f8c53010000         | jl                  0x159
            //   6a02                 | push                2
            //   5e                   | pop                 esi

        $sequence_10 = { e8???????? 8b44244c 8b4004 397c0454 0f8429010000 8d8424d0010000 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b44244c             | mov                 eax, dword ptr [esp + 0x4c]
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   397c0454             | cmp                 dword ptr [esp + eax + 0x54], edi
            //   0f8429010000         | je                  0x12f
            //   8d8424d0010000       | lea                 eax, [esp + 0x1d0]
            //   50                   | push                eax

        $sequence_11 = { 8d45f4 64a300000000 8965f0 8b7d08 57 8d45dc 33f6 }
            // n = 7, score = 200
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8965f0               | mov                 dword ptr [ebp - 0x10], esp
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   57                   | push                edi
            //   8d45dc               | lea                 eax, [ebp - 0x24]
            //   33f6                 | xor                 esi, esi

        $sequence_12 = { 33c0 8b8c2460030000 64890d00000000 59 5f 5e 5b }
            // n = 7, score = 200
            //   33c0                 | xor                 eax, eax
            //   8b8c2460030000       | mov                 ecx, dword ptr [esp + 0x360]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_13 = { 0f84fd000000 385f41 0f84f4000000 8b07 6aff ff5004 }
            // n = 6, score = 200
            //   0f84fd000000         | je                  0x103
            //   385f41               | cmp                 byte ptr [edi + 0x41], bl
            //   0f84f4000000         | je                  0xfa
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   6aff                 | push                -1
            //   ff5004               | call                dword ptr [eax + 4]

        $sequence_14 = { 8bc1 c20800 c20400 6a34 }
            // n = 4, score = 200
            //   8bc1                 | mov                 eax, ecx
            //   c20800               | ret                 8
            //   c20400               | ret                 4
            //   6a34                 | push                0x34

        $sequence_15 = { 50 ff74243c ff5214 85c0 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   ff74243c             | push                dword ptr [esp + 0x3c]
            //   ff5214               | call                dword ptr [edx + 0x14]
            //   85c0                 | test                eax, eax

    condition:
        7 of them and filesize < 1441792
}