rule win_absentloader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { 8d8de8fbffff e8???????? 68048701fd 53 6a18 8d8568fdffff }
            // n = 6, score = 200
            //   8d8de8fbffff         | lea                 ecx, [ebp - 0x418]
            //   e8????????           |                     
            //   68048701fd           | push                0xfd018704
            //   53                   | push                ebx
            //   6a18                 | push                0x18
            //   8d8568fdffff         | lea                 eax, [ebp - 0x298]

        $sequence_1 = { 83e03f c1f906 6bc038 03048de8a006fd 50 ff15???????? 5d }
            // n = 7, score = 200
            //   83e03f               | and                 eax, 0x3f
            //   c1f906               | sar                 ecx, 6
            //   6bc038               | imul                eax, eax, 0x38
            //   03048de8a006fd       | add                 eax, dword ptr [ecx*4 - 0x2f95f18]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   5d                   | pop                 ebp

        $sequence_2 = { 895dfc 6a0f 5a 895e10 895614 881e }
            // n = 6, score = 200
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   6a0f                 | push                0xf
            //   5a                   | pop                 edx
            //   895e10               | mov                 dword ptr [esi + 0x10], ebx
            //   895614               | mov                 dword ptr [esi + 0x14], edx
            //   881e                 | mov                 byte ptr [esi], bl

        $sequence_3 = { c745fc0a000000 8b4d2c 85c9 7411 8b31 8d4508 3bc8 }
            // n = 7, score = 200
            //   c745fc0a000000       | mov                 dword ptr [ebp - 4], 0xa
            //   8b4d2c               | mov                 ecx, dword ptr [ebp + 0x2c]
            //   85c9                 | test                ecx, ecx
            //   7411                 | je                  0x13
            //   8b31                 | mov                 esi, dword ptr [ecx]
            //   8d4508               | lea                 eax, [ebp + 8]
            //   3bc8                 | cmp                 ecx, eax

        $sequence_4 = { 59 c3 83610400 8bc1 83610800 c741040cf305fd c7013c1e05fd }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   83610400             | and                 dword ptr [ecx + 4], 0
            //   8bc1                 | mov                 eax, ecx
            //   83610800             | and                 dword ptr [ecx + 8], 0
            //   c741040cf305fd       | mov                 dword ptr [ecx + 4], 0xfd05f30c
            //   c7013c1e05fd         | mov                 dword ptr [ecx], 0xfd051e3c

        $sequence_5 = { c74408e82c1a06fd 8b06 8b5004 8d42e8 89440ae4 8365fc00 }
            // n = 6, score = 200
            //   c74408e82c1a06fd     | mov                 dword ptr [eax + ecx - 0x18], 0xfd061a2c
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   8d42e8               | lea                 eax, [edx - 0x18]
            //   89440ae4             | mov                 dword ptr [edx + ecx - 0x1c], eax
            //   8365fc00             | and                 dword ptr [ebp - 4], 0

        $sequence_6 = { 89a564faffff 8d85c0fbffff 8bf4 83ec18 8bcc 89a55cfaffff 50 }
            // n = 7, score = 200
            //   89a564faffff         | mov                 dword ptr [ebp - 0x59c], esp
            //   8d85c0fbffff         | lea                 eax, [ebp - 0x440]
            //   8bf4                 | mov                 esi, esp
            //   83ec18               | sub                 esp, 0x18
            //   8bcc                 | mov                 ecx, esp
            //   89a55cfaffff         | mov                 dword ptr [ebp - 0x5a4], esp
            //   50                   | push                eax

        $sequence_7 = { e8???????? 59 59 85c0 7505 b835f305fd 56 }
            // n = 7, score = 200
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7505                 | jne                 7
            //   b835f305fd           | mov                 eax, 0xfd05f335
            //   56                   | push                esi

        $sequence_8 = { 6a32 58 2b448ddc 6bc014 99 f7ff 8d0417 }
            // n = 7, score = 200
            //   6a32                 | push                0x32
            //   58                   | pop                 eax
            //   2b448ddc             | sub                 eax, dword ptr [ebp + ecx*4 - 0x24]
            //   6bc014               | imul                eax, eax, 0x14
            //   99                   | cdq                 
            //   f7ff                 | idiv                edi
            //   8d0417               | lea                 eax, [edi + edx]

        $sequence_9 = { 8bcf 8bd8 83c101 0f92c2 f7da 0bd1 52 }
            // n = 7, score = 200
            //   8bcf                 | mov                 ecx, edi
            //   8bd8                 | mov                 ebx, eax
            //   83c101               | add                 ecx, 1
            //   0f92c2               | setb                dl
            //   f7da                 | neg                 edx
            //   0bd1                 | or                  edx, ecx
            //   52                   | push                edx

    condition:
        7 of them and filesize < 794624
}