rule win_absentloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.absentloader."
        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.absentloader"
        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 = { c645fc17 8d7340 8d7d8c a5 8d8d54ffffff 50 }
            // n = 6, score = 200
            //   c645fc17             | mov                 byte ptr [ebp - 4], 0x17
            //   8d7340               | lea                 esi, [ebx + 0x40]
            //   8d7d8c               | lea                 edi, [ebp - 0x74]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   8d8d54ffffff         | lea                 ecx, [ebp - 0xac]
            //   50                   | push                eax

        $sequence_1 = { e8???????? baa8fb05fd 8d8df8faffff e8???????? 837d1c10 8d5508 ff7518 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   baa8fb05fd           | mov                 edx, 0xfd05fba8
            //   8d8df8faffff         | lea                 ecx, [ebp - 0x508]
            //   e8????????           |                     
            //   837d1c10             | cmp                 dword ptr [ebp + 0x1c], 0x10
            //   8d5508               | lea                 edx, [ebp + 8]
            //   ff7518               | push                dword ptr [ebp + 0x18]

        $sequence_2 = { 0fb6c0 0fbe80788306fd 03c8 83c601 83d200 41 }
            // n = 6, score = 200
            //   0fb6c0               | movzx               eax, al
            //   0fbe80788306fd       | movsx               eax, byte ptr [eax - 0x2f97c88]
            //   03c8                 | add                 ecx, eax
            //   83c601               | add                 esi, 1
            //   83d200               | adc                 edx, 0
            //   41                   | inc                 ecx

        $sequence_3 = { c1f802 c1e005 03c7 8945d8 8d45c4 50 e8???????? }
            // n = 7, score = 200
            //   c1f802               | sar                 eax, 2
            //   c1e005               | shl                 eax, 5
            //   03c7                 | add                 eax, edi
            //   8945d8               | mov                 dword ptr [ebp - 0x28], eax
            //   8d45c4               | lea                 eax, [ebp - 0x3c]
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { a5 a5 8bfc 8d75a4 a5 a5 a5 }
            // n = 7, score = 200
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   8bfc                 | mov                 edi, esp
            //   8d75a4               | lea                 esi, [ebp - 0x5c]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]

        $sequence_5 = { 59 5f 5e 5b 8b4dfc b8e0a906fd 33cd }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   b8e0a906fd           | mov                 eax, 0xfd06a9e0
            //   33cd                 | xor                 ecx, ebp

        $sequence_6 = { cc 6a14 b85a0205fd e8???????? 8bd9 8b750c 8b7d10 }
            // n = 7, score = 200
            //   cc                   | int3                
            //   6a14                 | push                0x14
            //   b85a0205fd           | mov                 eax, 0xfd05025a
            //   e8????????           |                     
            //   8bd9                 | mov                 ebx, ecx
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]

        $sequence_7 = { 5f 5e 8981d8000000 8b4dfc 33cd 5b e8???????? }
            // n = 7, score = 200
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8981d8000000         | mov                 dword ptr [ecx + 0xd8], eax
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp
            //   5b                   | pop                 ebx
            //   e8????????           |                     

        $sequence_8 = { 8d7b30 8bcf e8???????? 894328 83f80d 0f85af000000 8bcf }
            // n = 7, score = 200
            //   8d7b30               | lea                 edi, [ebx + 0x30]
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   894328               | mov                 dword ptr [ebx + 0x28], eax
            //   83f80d               | cmp                 eax, 0xd
            //   0f85af000000         | jne                 0xb5
            //   8bcf                 | mov                 ecx, edi

        $sequence_9 = { 51 51 a1???????? 33c5 8945fc 64a12c000000 66c745f8722e }
            // n = 7, score = 200
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   a1????????           |                     
            //   33c5                 | xor                 eax, ebp
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   64a12c000000         | mov                 eax, dword ptr fs:[0x2c]
            //   66c745f8722e         | mov                 word ptr [ebp - 8], 0x2e72

    condition:
        7 of them and filesize < 794624
}