rule win_ice_event_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ice_event."
        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.ice_event"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 4533c0 488d55c8 488d4c2430 e8???????? 488d4c2430 e8???????? }
            // n = 6, score = 100
            //   4533c0               | mov                 ecx, eax
            //   488d55c8             | nop                 
            //   488d4c2430           | dec                 eax
            //   e8????????           |                     
            //   488d4c2430           | mov                 eax, dword ptr [esp + 0x48]
            //   e8????????           |                     

        $sequence_1 = { 4533c0 33d2 33c9 ff15???????? 488d0d8f870100 eb0c 83f901 }
            // n = 7, score = 100
            //   4533c0               | dec                 eax
            //   33d2                 | lea                 ecx, [ebp + 0x38]
            //   33c9                 | dec                 eax
            //   ff15????????         |                     
            //   488d0d8f870100       | mov                 eax, esi
            //   eb0c                 | dec                 eax
            //   83f901               | mov                 ecx, dword ptr [ebp + 0x78]

        $sequence_2 = { 8d41ff 8b848218e40100 85c0 745b 83f801 }
            // n = 5, score = 100
            //   8d41ff               | mov                 byte ptr [ebp - 0x40], 0
            //   8b848218e40100       | dec                 eax
            //   85c0                 | mov                 eax, dword ptr [ebp - 0x48]
            //   745b                 | dec                 eax
            //   83f801               | cmp                 eax, 0x10

        $sequence_3 = { cc 488bc8 e8???????? 4c896c2450 48c74424580f000000 }
            // n = 5, score = 100
            //   cc                   | lea                 ecx, [0x1e663]
            //   488bc8               | inc                 ebp
            //   e8????????           |                     
            //   4c896c2450           | xor                 eax, eax
            //   48c74424580f000000     | dec    eax

        $sequence_4 = { c645e800 488b4520 4883f810 0f822c020000 48ffc0 488b4d08 483d00100000 }
            // n = 7, score = 100
            //   c645e800             | lea                 eax, [0xdefd]
            //   488b4520             | and                 ecx, 0x3f
            //   4883f810             | test                ecx, ecx
            //   0f822c020000         | js                  0x918
            //   48ffc0               | jae                 0x912
            //   488b4d08             | dec                 eax
            //   483d00100000         | mov                 edi, ebx

        $sequence_5 = { 448905???????? 33c0 4883c410 5b c3 4883ec38 488d05659a0000 }
            // n = 7, score = 100
            //   448905????????       |                     
            //   33c0                 | dec                 eax
            //   4883c410             | cmp                 dword ptr [ecx + 0x18], edi
            //   5b                   | mov                 byte ptr [ebx], 0
            //   c3                   | mov                 eax, esi
            //   4883ec38             | dec                 eax
            //   488d05659a0000       | mov                 ecx, dword ptr [esp + 0x78]

        $sequence_6 = { 7225 4883f927 7719 488bc8 e8???????? }
            // n = 5, score = 100
            //   7225                 | lea                 ecx, [edx + 0x108]
            //   4883f927             | dec                 eax
            //   7719                 | lea                 ecx, [edx + 0xe8]
            //   488bc8               | dec                 eax
            //   e8????????           |                     

        $sequence_7 = { 90 4c8d051cbe0100 488bd0 488d4da0 e8???????? 90 4c8bc3 }
            // n = 7, score = 100
            //   90                   | ja                  0xd6
            //   4c8d051cbe0100       | dec                 eax
            //   488bd0               | mov                 ecx, dword ptr [ecx + 0x18]
            //   488d4da0             | dec                 eax
            //   e8????????           |                     
            //   90                   | cmp                 ecx, eax
            //   4c8bc3               | je                  0xd6

        $sequence_8 = { 83f8ff 7504 32c0 eb1b 488d15c6b10100 8bc8 e8???????? }
            // n = 7, score = 100
            //   83f8ff               | dec                 eax
            //   7504                 | mov                 edx, dword ptr [edi]
            //   32c0                 | jmp                 0xef
            //   eb1b                 | dec                 eax
            //   488d15c6b10100       | mov                 edx, edi
            //   8bc8                 | dec                 eax
            //   e8????????           |                     

        $sequence_9 = { 488d55e8 488d4da8 e8???????? 90 4c8d4508 488d15f0e90100 488d4c2458 }
            // n = 7, score = 100
            //   488d55e8             | add                 esp, 0x28
            //   488d4da8             | inc                 ecx
            //   e8????????           |                     
            //   90                   | pop                 esi
            //   4c8d4508             | pop                 edi
            //   488d15f0e90100       | pop                 esi
            //   488d4c2458           | pop                 ebx

    condition:
        7 of them and filesize < 331776
}