rule win_icefog_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.icefog."
        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.icefog"
        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 = { 8b4508 8910 8b4920 83c004 894df0 894508 3bce }
            // n = 7, score = 200
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8910                 | mov                 dword ptr [eax], edx
            //   8b4920               | mov                 ecx, dword ptr [ecx + 0x20]
            //   83c004               | add                 eax, 4
            //   894df0               | mov                 dword ptr [ebp - 0x10], ecx
            //   894508               | mov                 dword ptr [ebp + 8], eax
            //   3bce                 | cmp                 ecx, esi

        $sequence_1 = { 894730 750a 837d9c00 7504 33c0 eb05 b801000000 }
            // n = 7, score = 200
            //   894730               | mov                 dword ptr [edi + 0x30], eax
            //   750a                 | jne                 0xc
            //   837d9c00             | cmp                 dword ptr [ebp - 0x64], 0
            //   7504                 | jne                 6
            //   33c0                 | xor                 eax, eax
            //   eb05                 | jmp                 7
            //   b801000000           | mov                 eax, 1

        $sequence_2 = { eb02 33c0 8a4dfc 884607 8a45ec 884e15 c78680000000ffffff3f }
            // n = 7, score = 200
            //   eb02                 | jmp                 4
            //   33c0                 | xor                 eax, eax
            //   8a4dfc               | mov                 cl, byte ptr [ebp - 4]
            //   884607               | mov                 byte ptr [esi + 7], al
            //   8a45ec               | mov                 al, byte ptr [ebp - 0x14]
            //   884e15               | mov                 byte ptr [esi + 0x15], cl
            //   c78680000000ffffff3f     | mov    dword ptr [esi + 0x80], 0x3fffffff

        $sequence_3 = { 8b450c 33d2 83f905 0f94c2 52 53 50 }
            // n = 7, score = 200
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   33d2                 | xor                 edx, edx
            //   83f905               | cmp                 ecx, 5
            //   0f94c2               | sete                dl
            //   52                   | push                edx
            //   53                   | push                ebx
            //   50                   | push                eax

        $sequence_4 = { 8b4310 85c0 7408 8b4050 8945fc eb0a c745fc00ca9a3b }
            // n = 7, score = 200
            //   8b4310               | mov                 eax, dword ptr [ebx + 0x10]
            //   85c0                 | test                eax, eax
            //   7408                 | je                  0xa
            //   8b4050               | mov                 eax, dword ptr [eax + 0x50]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   eb0a                 | jmp                 0xc
            //   c745fc00ca9a3b       | mov                 dword ptr [ebp - 4], 0x3b9aca00

        $sequence_5 = { e8???????? 8b4d0c 8b5614 6af0 50 8b4510 51 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8b5614               | mov                 edx, dword ptr [esi + 0x14]
            //   6af0                 | push                -0x10
            //   50                   | push                eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   51                   | push                ecx

        $sequence_6 = { 8b45f8 8b5df4 85c0 0f85d4000000 8b7b14 8b5b0c 4b }
            // n = 7, score = 200
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   8b5df4               | mov                 ebx, dword ptr [ebp - 0xc]
            //   85c0                 | test                eax, eax
            //   0f85d4000000         | jne                 0xda
            //   8b7b14               | mov                 edi, dword ptr [ebx + 0x14]
            //   8b5b0c               | mov                 ebx, dword ptr [ebx + 0xc]
            //   4b                   | dec                 ebx

        $sequence_7 = { 8945fc 3bca 0f8e48ffffff 8955ec 8d4900 8955f4 39570c }
            // n = 7, score = 200
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   3bca                 | cmp                 ecx, edx
            //   0f8e48ffffff         | jle                 0xffffff4e
            //   8955ec               | mov                 dword ptr [ebp - 0x14], edx
            //   8d4900               | lea                 ecx, [ecx]
            //   8955f4               | mov                 dword ptr [ebp - 0xc], edx
            //   39570c               | cmp                 dword ptr [edi + 0xc], edx

        $sequence_8 = { c3 50 e8???????? 83c404 8b450c 8b4804 8b10 }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b4804               | mov                 ecx, dword ptr [eax + 4]
            //   8b10                 | mov                 edx, dword ptr [eax]

        $sequence_9 = { 8d5901 895dfc 8b5d18 03d8 03cb 8955f0 8b5608 }
            // n = 7, score = 200
            //   8d5901               | lea                 ebx, [ecx + 1]
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   8b5d18               | mov                 ebx, dword ptr [ebp + 0x18]
            //   03d8                 | add                 ebx, eax
            //   03cb                 | add                 ecx, ebx
            //   8955f0               | mov                 dword ptr [ebp - 0x10], edx
            //   8b5608               | mov                 edx, dword ptr [esi + 8]

    condition:
        7 of them and filesize < 1187840
}