rule win_onliner_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.onliner."
        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.onliner"
        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 = { 33c6 23c3 33c7 0345fc 0345e0 05aff7448b ba0c000000 }
            // n = 7, score = 100
            //   33c6                 | xor                 eax, esi
            //   23c3                 | and                 eax, ebx
            //   33c7                 | xor                 eax, edi
            //   0345fc               | add                 eax, dword ptr [ebp - 4]
            //   0345e0               | add                 eax, dword ptr [ebp - 0x20]
            //   05aff7448b           | add                 eax, 0x8b44f7af
            //   ba0c000000           | mov                 edx, 0xc

        $sequence_1 = { 7435 68???????? ff75c4 68???????? ff75d4 8d854cffffff ba04000000 }
            // n = 7, score = 100
            //   7435                 | je                  0x37
            //   68????????           |                     
            //   ff75c4               | push                dword ptr [ebp - 0x3c]
            //   68????????           |                     
            //   ff75d4               | push                dword ptr [ebp - 0x2c]
            //   8d854cffffff         | lea                 eax, [ebp - 0xb4]
            //   ba04000000           | mov                 edx, 4

        $sequence_2 = { 83e804 7420 48 83e80a 7220 eb41 83c0bf }
            // n = 7, score = 100
            //   83e804               | sub                 eax, 4
            //   7420                 | je                  0x22
            //   48                   | dec                 eax
            //   83e80a               | sub                 eax, 0xa
            //   7220                 | jb                  0x22
            //   eb41                 | jmp                 0x43
            //   83c0bf               | add                 eax, -0x41

        $sequence_3 = { 894304 33c0 5a 59 59 648910 68???????? }
            // n = 7, score = 100
            //   894304               | mov                 dword ptr [ebx + 4], eax
            //   33c0                 | xor                 eax, eax
            //   5a                   | pop                 edx
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   648910               | mov                 dword ptr fs:[eax], edx
            //   68????????           |                     

        $sequence_4 = { 7426 8bc6 e8???????? 8bd8 eb01 4b 85db }
            // n = 7, score = 100
            //   7426                 | je                  0x28
            //   8bc6                 | mov                 eax, esi
            //   e8????????           |                     
            //   8bd8                 | mov                 ebx, eax
            //   eb01                 | jmp                 3
            //   4b                   | dec                 ebx
            //   85db                 | test                ebx, ebx

        $sequence_5 = { 8bc1 c1f805 8bf1 83e61f 8d3c8560f94c00 8b07 }
            // n = 6, score = 100
            //   8bc1                 | mov                 eax, ecx
            //   c1f805               | sar                 eax, 5
            //   8bf1                 | mov                 esi, ecx
            //   83e61f               | and                 esi, 0x1f
            //   8d3c8560f94c00       | lea                 edi, [eax*4 + 0x4cf960]
            //   8b07                 | mov                 eax, dword ptr [edi]

        $sequence_6 = { dbac537f364000 def9 c1e805 7434 89c2 83e20f 740c }
            // n = 7, score = 100
            //   dbac537f364000       | fld                 xword ptr [ebx + edx*2 + 0x40367f]
            //   def9                 | fdivp               st(1)
            //   c1e805               | shr                 eax, 5
            //   7434                 | je                  0x36
            //   89c2                 | mov                 edx, eax
            //   83e20f               | and                 edx, 0xf
            //   740c                 | je                  0xe

        $sequence_7 = { 80ea0a 7405 80ea03 7546 897c2404 8b0424 8bd3 }
            // n = 7, score = 100
            //   80ea0a               | sub                 dl, 0xa
            //   7405                 | je                  7
            //   80ea03               | sub                 dl, 3
            //   7546                 | jne                 0x48
            //   897c2404             | mov                 dword ptr [esp + 4], edi
            //   8b0424               | mov                 eax, dword ptr [esp]
            //   8bd3                 | mov                 edx, ebx

        $sequence_8 = { ba01000000 e8???????? eb60 833d????????01 7557 8b03 }
            // n = 6, score = 100
            //   ba01000000           | mov                 edx, 1
            //   e8????????           |                     
            //   eb60                 | jmp                 0x62
            //   833d????????01       |                     
            //   7557                 | jne                 0x59
            //   8b03                 | mov                 eax, dword ptr [ebx]

        $sequence_9 = { 64ff30 648920 8b45f8 e8???????? bb01000000 33ff 8b45fc }
            // n = 7, score = 100
            //   64ff30               | push                dword ptr fs:[eax]
            //   648920               | mov                 dword ptr fs:[eax], esp
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   e8????????           |                     
            //   bb01000000           | mov                 ebx, 1
            //   33ff                 | xor                 edi, edi
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]

    condition:
        7 of them and filesize < 1736704
}