rule win_icondown_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.icondown."
        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.icondown"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 85c9 740d 8b01 6a01 ff10 8b4e10 }
            // n = 6, score = 200
            //   85c9                 | test                ecx, ecx
            //   740d                 | je                  0xf
            //   8b01                 | mov                 eax, dword ptr [ecx]
            //   6a01                 | push                1
            //   ff10                 | call                dword ptr [eax]
            //   8b4e10               | mov                 ecx, dword ptr [esi + 0x10]

        $sequence_1 = { 884c2436 88442437 8844243f 884c2441 884c2444 }
            // n = 5, score = 200
            //   884c2436             | mov                 byte ptr [esp + 0x36], cl
            //   88442437             | mov                 byte ptr [esp + 0x37], al
            //   8844243f             | mov                 byte ptr [esp + 0x3f], al
            //   884c2441             | mov                 byte ptr [esp + 0x41], cl
            //   884c2444             | mov                 byte ptr [esp + 0x44], cl

        $sequence_2 = { 6828130000 52 ff15???????? 8b4c2420 8b442418 8b54241c 2bc8 }
            // n = 7, score = 200
            //   6828130000           | push                0x1328
            //   52                   | push                edx
            //   ff15????????         |                     
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   8b54241c             | mov                 edx, dword ptr [esp + 0x1c]
            //   2bc8                 | sub                 ecx, eax

        $sequence_3 = { 8b09 8988c0000000 c3 8bc1 83600400 }
            // n = 5, score = 200
            //   8b09                 | mov                 ecx, dword ptr [ecx]
            //   8988c0000000         | mov                 dword ptr [eax + 0xc0], ecx
            //   c3                   | ret                 
            //   8bc1                 | mov                 eax, ecx
            //   83600400             | and                 dword ptr [eax + 4], 0

        $sequence_4 = { 48 89866c1e4500 740c 8b442414 3986601e4500 7538 8b86681e4500 }
            // n = 7, score = 200
            //   48                   | dec                 eax
            //   89866c1e4500         | mov                 dword ptr [esi + 0x451e6c], eax
            //   740c                 | je                  0xe
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   3986601e4500         | cmp                 dword ptr [esi + 0x451e60], eax
            //   7538                 | jne                 0x3a
            //   8b86681e4500         | mov                 eax, dword ptr [esi + 0x451e68]

        $sequence_5 = { 51 8b4c2420 2bd1 52 50 51 8b4c2450 }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   8b4c2420             | mov                 ecx, dword ptr [esp + 0x20]
            //   2bd1                 | sub                 edx, ecx
            //   52                   | push                edx
            //   50                   | push                eax
            //   51                   | push                ecx
            //   8b4c2450             | mov                 ecx, dword ptr [esp + 0x50]

        $sequence_6 = { 6a6c 89742410 e8???????? 8dbeb8000000 c744241400000000 8bcf e8???????? }
            // n = 7, score = 200
            //   6a6c                 | push                0x6c
            //   89742410             | mov                 dword ptr [esp + 0x10], esi
            //   e8????????           |                     
            //   8dbeb8000000         | lea                 edi, [esi + 0xb8]
            //   c744241400000000     | mov                 dword ptr [esp + 0x14], 0
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     

        $sequence_7 = { 84c0 7407 c644242401 ebbf 5f 5e 5d }
            // n = 7, score = 200
            //   84c0                 | test                al, al
            //   7407                 | je                  9
            //   c644242401           | mov                 byte ptr [esp + 0x24], 1
            //   ebbf                 | jmp                 0xffffffc1
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp

        $sequence_8 = { ff2485bc2f4000 56 8d44246c 55 50 e8???????? 83c40c }
            // n = 7, score = 200
            //   ff2485bc2f4000       | jmp                 dword ptr [eax*4 + 0x402fbc]
            //   56                   | push                esi
            //   8d44246c             | lea                 eax, [esp + 0x6c]
            //   55                   | push                ebp
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_9 = { 2bd9 2be8 33c9 33c0 }
            // n = 4, score = 200
            //   2bd9                 | sub                 ebx, ecx
            //   2be8                 | sub                 ebp, eax
            //   33c9                 | xor                 ecx, ecx
            //   33c0                 | xor                 eax, eax

    condition:
        7 of them and filesize < 5505024
}