rule win_iisniff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "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 = { 2bc2 51 8d942410010000 52 8b8e84000000 89442418 8b4608 }
            // n = 7, score = 200
            //   2bc2                 | sub                 eax, edx
            //   51                   | push                ecx
            //   8d942410010000       | lea                 edx, [esp + 0x110]
            //   52                   | push                edx
            //   8b8e84000000         | mov                 ecx, dword ptr [esi + 0x84]
            //   89442418             | mov                 dword ptr [esp + 0x18], eax
            //   8b4608               | mov                 eax, dword ptr [esi + 8]

        $sequence_1 = { 85f6 7fe6 0fb675d3 ebb2 55 }
            // n = 5, score = 200
            //   85f6                 | test                esi, esi
            //   7fe6                 | jg                  0xffffffe8
            //   0fb675d3             | movzx               esi, byte ptr [ebp - 0x2d]
            //   ebb2                 | jmp                 0xffffffb4
            //   55                   | push                ebp

        $sequence_2 = { 83c404 8b442420 c78424c40000000f000000 c78424c000000000000000 c68424b000000000 8b4804 }
            // n = 6, score = 200
            //   83c404               | add                 esp, 4
            //   8b442420             | mov                 eax, dword ptr [esp + 0x20]
            //   c78424c40000000f000000     | mov    dword ptr [esp + 0xc4], 0xf
            //   c78424c000000000000000     | mov    dword ptr [esp + 0xc0], 0
            //   c68424b000000000     | mov                 byte ptr [esp + 0xb0], 0
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]

        $sequence_3 = { eb05 1bc0 83d8ff 85c0 0f851e020000 56 e8???????? }
            // n = 7, score = 200
            //   eb05                 | jmp                 7
            //   1bc0                 | sbb                 eax, eax
            //   83d8ff               | sbb                 eax, -1
            //   85c0                 | test                eax, eax
            //   0f851e020000         | jne                 0x224
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_4 = { e8???????? eb02 33db 8b44240c 6a20 56 895e24 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   eb02                 | jmp                 4
            //   33db                 | xor                 ebx, ebx
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   6a20                 | push                0x20
            //   56                   | push                esi
            //   895e24               | mov                 dword ptr [esi + 0x24], ebx

        $sequence_5 = { 50 ffd1 85c0 7413 }
            // n = 4, score = 200
            //   50                   | push                eax
            //   ffd1                 | call                ecx
            //   85c0                 | test                eax, eax
            //   7413                 | je                  0x15

        $sequence_6 = { 0f840a010000 6aff 56 8b750c }
            // n = 4, score = 200
            //   0f840a010000         | je                  0x110
            //   6aff                 | push                -1
            //   56                   | push                esi
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]

        $sequence_7 = { 8bcb 8974242c 89742430 89742454 ff503c }
            // n = 5, score = 200
            //   8bcb                 | mov                 ecx, ebx
            //   8974242c             | mov                 dword ptr [esp + 0x2c], esi
            //   89742430             | mov                 dword ptr [esp + 0x30], esi
            //   89742454             | mov                 dword ptr [esp + 0x54], esi
            //   ff503c               | call                dword ptr [eax + 0x3c]

        $sequence_8 = { e9???????? 56 8bf0 83c65c 8bce e8???????? 56 }
            // n = 7, score = 200
            //   e9????????           |                     
            //   56                   | push                esi
            //   8bf0                 | mov                 esi, eax
            //   83c65c               | add                 esi, 0x5c
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   56                   | push                esi

        $sequence_9 = { e9???????? 8b07 8d4c241c 51 8d4c243c }
            // n = 5, score = 200
            //   e9????????           |                     
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8d4c241c             | lea                 ecx, [esp + 0x1c]
            //   51                   | push                ecx
            //   8d4c243c             | lea                 ecx, [esp + 0x3c]

        $sequence_10 = { 39bc24bc000000 7307 8d8424a8000000 8b8e84000000 6a01 8d542410 52 }
            // n = 7, score = 200
            //   39bc24bc000000       | cmp                 dword ptr [esp + 0xbc], edi
            //   7307                 | jae                 9
            //   8d8424a8000000       | lea                 eax, [esp + 0xa8]
            //   8b8e84000000         | mov                 ecx, dword ptr [esi + 0x84]
            //   6a01                 | push                1
            //   8d542410             | lea                 edx, [esp + 0x10]
            //   52                   | push                edx

        $sequence_11 = { 6a03 68000000c0 68???????? ff15???????? 6a02 }
            // n = 5, score = 200
            //   6a03                 | push                3
            //   68000000c0           | push                0xc0000000
            //   68????????           |                     
            //   ff15????????         |                     
            //   6a02                 | push                2

        $sequence_12 = { 33cc e8???????? 8be5 5d c20800 ff742418 }
            // n = 6, score = 200
            //   33cc                 | xor                 ecx, esp
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   ff742418             | push                dword ptr [esp + 0x18]

        $sequence_13 = { 8b5608 8944240c 6a01 8d442410 }
            // n = 4, score = 200
            //   8b5608               | mov                 edx, dword ptr [esi + 8]
            //   8944240c             | mov                 dword ptr [esp + 0xc], eax
            //   6a01                 | push                1
            //   8d442410             | lea                 eax, [esp + 0x10]

        $sequence_14 = { 8b10 56 56 ff742420 8bc8 56 }
            // n = 6, score = 200
            //   8b10                 | mov                 edx, dword ptr [eax]
            //   56                   | push                esi
            //   56                   | push                esi
            //   ff742420             | push                dword ptr [esp + 0x20]
            //   8bc8                 | mov                 ecx, eax
            //   56                   | push                esi

    condition:
        7 of them and filesize < 1441792
}