rule win_icefog_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        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 = "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 = { c3 56 8b750c b862000000 3bf1 7403 0fb606 }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   56                   | push                esi
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   b862000000           | mov                 eax, 0x62
            //   3bf1                 | cmp                 esi, ecx
            //   7403                 | je                  5
            //   0fb606               | movzx               eax, byte ptr [esi]

        $sequence_1 = { c680e200000000 8b4e04 51 57 e8???????? eb42 6a00 }
            // n = 7, score = 200
            //   c680e200000000       | mov                 byte ptr [eax + 0xe2], 0
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   51                   | push                ecx
            //   57                   | push                edi
            //   e8????????           |                     
            //   eb42                 | jmp                 0x44
            //   6a00                 | push                0

        $sequence_2 = { e8???????? 83c414 8945e8 837de400 0f84f1010000 8b45e0 8b4de8 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   837de400             | cmp                 dword ptr [ebp - 0x1c], 0
            //   0f84f1010000         | je                  0x1f7
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]

        $sequence_3 = { 8945f4 7414 53 6a00 6a02 8bc7 8bce }
            // n = 7, score = 200
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   7414                 | je                  0x16
            //   53                   | push                ebx
            //   6a00                 | push                0
            //   6a02                 | push                2
            //   8bc7                 | mov                 eax, edi
            //   8bce                 | mov                 ecx, esi

        $sequence_4 = { 8b551c 8b4d24 89471c 895710 894f20 5f }
            // n = 6, score = 200
            //   8b551c               | mov                 edx, dword ptr [ebp + 0x1c]
            //   8b4d24               | mov                 ecx, dword ptr [ebp + 0x24]
            //   89471c               | mov                 dword ptr [edi + 0x1c], eax
            //   895710               | mov                 dword ptr [edi + 0x10], edx
            //   894f20               | mov                 dword ptr [edi + 0x20], ecx
            //   5f                   | pop                 edi

        $sequence_5 = { e8???????? 83c408 897e70 8b4e70 014e48 83564c00 8b4dfc }
            // n = 7, score = 200
            //   e8????????           |                     
            //   83c408               | add                 esp, 8
            //   897e70               | mov                 dword ptr [esi + 0x70], edi
            //   8b4e70               | mov                 ecx, dword ptr [esi + 0x70]
            //   014e48               | add                 dword ptr [esi + 0x48], ecx
            //   83564c00             | adc                 dword ptr [esi + 0x4c], 0
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_6 = { 8bf1 f706feffffff 57 8bd8 7605 e8???????? 8d04dd00000000 }
            // n = 7, score = 200
            //   8bf1                 | mov                 esi, ecx
            //   f706feffffff         | test                dword ptr [esi], 0xfffffffe
            //   57                   | push                edi
            //   8bd8                 | mov                 ebx, eax
            //   7605                 | jbe                 7
            //   e8????????           |                     
            //   8d04dd00000000       | lea                 eax, [ebx*8]

        $sequence_7 = { e8???????? e9???????? 8b56e4 8b4604 8b4ef4 52 50 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   e9????????           |                     
            //   8b56e4               | mov                 edx, dword ptr [esi - 0x1c]
            //   8b4604               | mov                 eax, dword ptr [esi + 4]
            //   8b4ef4               | mov                 ecx, dword ptr [esi - 0xc]
            //   52                   | push                edx
            //   50                   | push                eax

        $sequence_8 = { 8b4dfc 33cd e8???????? 8be5 5d c3 668b8c4bb0000000 }
            // n = 7, score = 200
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   e8????????           |                     
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c3                   | ret                 
            //   668b8c4bb0000000     | mov                 cx, word ptr [ebx + ecx*2 + 0xb0]

        $sequence_9 = { 8bf0 8bfa e8???????? 895dfc 894df8 df6df8 c745f800c0692a }
            // n = 7, score = 200
            //   8bf0                 | mov                 esi, eax
            //   8bfa                 | mov                 edi, edx
            //   e8????????           |                     
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   894df8               | mov                 dword ptr [ebp - 8], ecx
            //   df6df8               | fild                qword ptr [ebp - 8]
            //   c745f800c0692a       | mov                 dword ptr [ebp - 8], 0x2a69c000

    condition:
        7 of them and filesize < 1187840
}