rule win_malumpos_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.malumpos."
        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.malumpos"
        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 = { 25ffffffff f8 ff45fc 0fb705???????? 8b55fc 8d0441 }
            // n = 6, score = 100
            //   25ffffffff           | and                 eax, 0xffffffff
            //   f8                   | clc                 
            //   ff45fc               | inc                 dword ptr [ebp - 4]
            //   0fb705????????       |                     
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   8d0441               | lea                 eax, [ecx + eax*2]

        $sequence_1 = { e8???????? 8bc8 a1???????? 0fafc1 c3 8bff }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   a1????????           |                     
            //   0fafc1               | imul                eax, ecx
            //   c3                   | ret                 
            //   8bff                 | mov                 edi, edi

        $sequence_2 = { 53 8b5d0c 56 7513 be???????? }
            // n = 5, score = 100
            //   53                   | push                ebx
            //   8b5d0c               | mov                 ebx, dword ptr [ebp + 0xc]
            //   56                   | push                esi
            //   7513                 | jne                 0x15
            //   be????????           |                     

        $sequence_3 = { 8bc9 87c4 87c4 56 81fcb9c549b3 5e 55 }
            // n = 7, score = 100
            //   8bc9                 | mov                 ecx, ecx
            //   87c4                 | xchg                esp, eax
            //   87c4                 | xchg                esp, eax
            //   56                   | push                esi
            //   81fcb9c549b3         | cmp                 esp, 0xb349c5b9
            //   5e                   | pop                 esi
            //   55                   | push                ebp

        $sequence_4 = { 6683ca00 c1ea20 7105 7103 83ea00 3c28 57 }
            // n = 7, score = 100
            //   6683ca00             | or                  dx, 0
            //   c1ea20               | shr                 edx, 0x20
            //   7105                 | jno                 7
            //   7103                 | jno                 5
            //   83ea00               | sub                 edx, 0
            //   3c28                 | cmp                 al, 0x28
            //   57                   | push                edi

        $sequence_5 = { 8b0d???????? 8db408f8000000 8b4608 894568 3bc3 0f84d9000000 }
            // n = 6, score = 100
            //   8b0d????????         |                     
            //   8db408f8000000       | lea                 esi, [eax + ecx + 0xf8]
            //   8b4608               | mov                 eax, dword ptr [esi + 8]
            //   894568               | mov                 dword ptr [ebp + 0x68], eax
            //   3bc3                 | cmp                 eax, ebx
            //   0f84d9000000         | je                  0xdf

        $sequence_6 = { 8a0432 3c3d 7506 8365fc00 eb0d }
            // n = 5, score = 100
            //   8a0432               | mov                 al, byte ptr [edx + esi]
            //   3c3d                 | cmp                 al, 0x3d
            //   7506                 | jne                 8
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   eb0d                 | jmp                 0xf

        $sequence_7 = { 817d6003010000 0f84e0feffff beb80b0000 56 ff15???????? 56 }
            // n = 6, score = 100
            //   817d6003010000       | cmp                 dword ptr [ebp + 0x60], 0x103
            //   0f84e0feffff         | je                  0xfffffee6
            //   beb80b0000           | mov                 esi, 0xbb8
            //   56                   | push                esi
            //   ff15????????         |                     
            //   56                   | push                esi

        $sequence_8 = { 85c0 7446 8b400c 56 8b700c 68???????? 57 }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7446                 | je                  0x48
            //   8b400c               | mov                 eax, dword ptr [eax + 0xc]
            //   56                   | push                esi
            //   8b700c               | mov                 esi, dword ptr [eax + 0xc]
            //   68????????           |                     
            //   57                   | push                edi

        $sequence_9 = { c0ca98 5e 5a 7605 7a03 51 }
            // n = 6, score = 100
            //   c0ca98               | ror                 dl, 0x98
            //   5e                   | pop                 esi
            //   5a                   | pop                 edx
            //   7605                 | jbe                 7
            //   7a03                 | jp                  5
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 542720
}