rule win_buzus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.buzus."
        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.buzus"
        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 = { 53 53 6a02 53 53 8d85ccfdffff 6800000040 }
            // n = 7, score = 100
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   6a02                 | push                2
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   8d85ccfdffff         | lea                 eax, [ebp - 0x234]
            //   6800000040           | push                0x40000000

        $sequence_1 = { 59 1bc0 59 83e007 e9???????? ff7508 be04010000 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   1bc0                 | sbb                 eax, eax
            //   59                   | pop                 ecx
            //   83e007               | and                 eax, 7
            //   e9????????           |                     
            //   ff7508               | push                dword ptr [ebp + 8]
            //   be04010000           | mov                 esi, 0x104

        $sequence_2 = { 50 e8???????? 8dbc0606010000 8b35???????? 57 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   8dbc0606010000       | lea                 edi, [esi + eax + 0x106]
            //   8b35????????         |                     
            //   57                   | push                edi

        $sequence_3 = { ff15???????? 8bc6 59 69c018020000 }
            // n = 4, score = 100
            //   ff15????????         |                     
            //   8bc6                 | mov                 eax, esi
            //   59                   | pop                 ecx
            //   69c018020000         | imul                eax, eax, 0x218

        $sequence_4 = { e8???????? 8a85b0faffff 59 3a05???????? 59 0f85a0000000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8a85b0faffff         | mov                 al, byte ptr [ebp - 0x550]
            //   59                   | pop                 ecx
            //   3a05????????         |                     
            //   59                   | pop                 ecx
            //   0f85a0000000         | jne                 0xa6

        $sequence_5 = { 8d45c8 50 56 e8???????? 57 56 }
            // n = 6, score = 100
            //   8d45c8               | lea                 eax, [ebp - 0x38]
            //   50                   | push                eax
            //   56                   | push                esi
            //   e8????????           |                     
            //   57                   | push                edi
            //   56                   | push                esi

        $sequence_6 = { 6a01 58 eb60 50 ff36 e8???????? 59 }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   58                   | pop                 eax
            //   eb60                 | jmp                 0x62
            //   50                   | push                eax
            //   ff36                 | push                dword ptr [esi]
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_7 = { 68???????? 68???????? e9???????? 8d851cfdffff 50 6804010000 }
            // n = 6, score = 100
            //   68????????           |                     
            //   68????????           |                     
            //   e9????????           |                     
            //   8d851cfdffff         | lea                 eax, [ebp - 0x2e4]
            //   50                   | push                eax
            //   6804010000           | push                0x104

        $sequence_8 = { 57 ff15???????? 83f8ff 0f84e5060000 56 6889000000 68???????? }
            // n = 7, score = 100
            //   57                   | push                edi
            //   ff15????????         |                     
            //   83f8ff               | cmp                 eax, -1
            //   0f84e5060000         | je                  0x6eb
            //   56                   | push                esi
            //   6889000000           | push                0x89
            //   68????????           |                     

        $sequence_9 = { ff760c 8945cc ff15???????? 83c40c 83f803 8945b8 }
            // n = 6, score = 100
            //   ff760c               | push                dword ptr [esi + 0xc]
            //   8945cc               | mov                 dword ptr [ebp - 0x34], eax
            //   ff15????????         |                     
            //   83c40c               | add                 esp, 0xc
            //   83f803               | cmp                 eax, 3
            //   8945b8               | mov                 dword ptr [ebp - 0x48], eax

    condition:
        7 of them and filesize < 679936
}