rule win_newpass_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.newpass."
        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.newpass"
        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 = { 4885c0 7904 f20f58f3 41b601 48ffc3 }
            // n = 5, score = 700
            //   4885c0               | inc                 ecx
            //   7904                 | xor                 al, byte ptr [eax + edx]
            //   f20f58f3             | xor                 al, 0x2e
            //   41b601               | mov                 byte ptr [edx], al
            //   48ffc3               | inc                 eax

        $sequence_1 = { 488b4c2478 e8???????? 32c0 eb02 b001 488b8c2498000000 }
            // n = 6, score = 700
            //   488b4c2478           | lea                 ecx, [ebp + 0x18]
            //   e8????????           |                     
            //   32c0                 | nop                 
            //   eb02                 | dec                 eax
            //   b001                 | lea                 ecx, [ebp + 0x100]
            //   488b8c2498000000     | nop                 

        $sequence_2 = { 83c037 48837f1810 7205 488b0f eb03 488bcf 880451 }
            // n = 7, score = 700
            //   83c037               | dec                 ecx
            //   48837f1810           | or                  edi, 0xffffffff
            //   7205                 | test                eax, eax
            //   488b0f               | inc                 ecx
            //   eb03                 | mov                 ecx, eax
            //   488bcf               | nop                 dword ptr [eax]
            //   880451               | inc                 ecx

        $sequence_3 = { 488d4db0 e8???????? 90 48837d6810 7209 488b4d50 e8???????? }
            // n = 7, score = 700
            //   488d4db0             | cmp                 ebx, esi
            //   e8????????           |                     
            //   90                   | nop                 
            //   48837d6810           | dec                 eax
            //   7209                 | mov                 ebx, dword ptr [ebp - 0x71]
            //   488b4d50             | dec                 eax
            //   e8????????           |                     

        $sequence_4 = { e8???????? 4c8b542458 498902 8b0b c6040100 803d????????00 753e }
            // n = 7, score = 700
            //   e8????????           |                     
            //   4c8b542458           | mov                 dword ptr [ebp - 0x51], eax
            //   498902               | xor                 esi, esi
            //   8b0b                 | mov                 dword ptr [ebp - 0x49], esi
            //   c6040100             | dec                 eax
            //   803d????????00       |                     
            //   753e                 | mov                 dword ptr [ebp - 0x41], esi

        $sequence_5 = { 488b03 48634804 4803cb 8b8424a0000000 85c0 7418 8b5110 }
            // n = 7, score = 700
            //   488b03               | mov                 eax, 0xd
            //   48634804             | jb                  0x26
            //   4803cb               | dec                 eax
            //   8b8424a0000000       | mov                 dword ptr [esp + 0x48], 7
            //   85c0                 | dec                 esp
            //   7418                 | mov                 dword ptr [esp + 0x40], esp
            //   8b5110               | inc                 sp

        $sequence_6 = { 48b80000000000000080 c7411006220000 4885f8 8b4110 488939 0f44c2 }
            // n = 6, score = 700
            //   48b80000000000000080     | inc    eax
            //   c7411006220000       | inc                 ecx
            //   4885f8               | xor                 al, byte ptr [eax + edx]
            //   8b4110               | xor                 al, 0x70
            //   488939               | mov                 byte ptr [edx], al
            //   0f44c2               | inc                 ecx

        $sequence_7 = { 4c8b05???????? 4d2bc1 0f1f840000000000 8bc1 25ff000080 7d09 }
            // n = 6, score = 700
            //   4c8b05????????       |                     
            //   4d2bc1               | cmp                 al, 0x7d
            //   0f1f840000000000     | ja                  0x523
            //   8bc1                 | dec                 eax
            //   25ff000080           | cmp                 dword ptr [ebp - 0x19], esi
            //   7d09                 | jne                 0x2c5

        $sequence_8 = { 4c8bc7 49ffc0 6643833c4200 75f5 498bd2 488d4d00 }
            // n = 6, score = 700
            //   4c8bc7               | dec                 eax
            //   49ffc0               | arpl                ax, cx
            //   6643833c4200         | mov                 eax, 0x30
            //   75f5                 | inc                 ecx
            //   498bd2               | cmp                 esi, 3
            //   488d4d00             | jl                  0xd30

        $sequence_9 = { ff15???????? 488bf8 4885c0 0f84d2000000 48897008 0fb74516 4533ed }
            // n = 7, score = 700
            //   ff15????????         |                     
            //   488bf8               | mov                 ecx, dword ptr [esp + 0x68]
            //   4885c0               | dec                 eax
            //   0f84d2000000         | test                ecx, ecx
            //   48897008             | je                  0x3dd0
            //   0fb74516             | dec                 esp
            //   4533ed               | lea                 esi, [0x9c3f6]

    condition:
        7 of them and filesize < 2654208
}