rule win_asprox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.asprox."
        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.asprox"
        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 = { 0f84a1000000 0fb69567fcffff 85d2 0f8592000000 c68567fcffff01 8d85e8fdffff 50 }
            // n = 7, score = 1200
            //   0f84a1000000         | je                  0xa7
            //   0fb69567fcffff       | movzx               edx, byte ptr [ebp - 0x399]
            //   85d2                 | test                edx, edx
            //   0f8592000000         | jne                 0x98
            //   c68567fcffff01       | mov                 byte ptr [ebp - 0x399], 1
            //   8d85e8fdffff         | lea                 eax, [ebp - 0x218]
            //   50                   | push                eax

        $sequence_1 = { c685d5feffff65 c685d6feffff74 c685d7feffff50 c685d8feffff72 c685d9feffff6f c685dafeffff63 c685dbfeffff41 }
            // n = 7, score = 1200
            //   c685d5feffff65       | mov                 byte ptr [ebp - 0x12b], 0x65
            //   c685d6feffff74       | mov                 byte ptr [ebp - 0x12a], 0x74
            //   c685d7feffff50       | mov                 byte ptr [ebp - 0x129], 0x50
            //   c685d8feffff72       | mov                 byte ptr [ebp - 0x128], 0x72
            //   c685d9feffff6f       | mov                 byte ptr [ebp - 0x127], 0x6f
            //   c685dafeffff63       | mov                 byte ptr [ebp - 0x126], 0x63
            //   c685dbfeffff41       | mov                 byte ptr [ebp - 0x125], 0x41

        $sequence_2 = { 52 6a00 a1???????? 50 ff15???????? 8b4df8 51 }
            // n = 7, score = 1200
            //   52                   | push                edx
            //   6a00                 | push                0
            //   a1????????           |                     
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4df8               | mov                 ecx, dword ptr [ebp - 8]
            //   51                   | push                ecx

        $sequence_3 = { 8b450c 0345fc 0fb608 0bca 8b550c 0355fc 880a }
            // n = 7, score = 1200
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   0345fc               | add                 eax, dword ptr [ebp - 4]
            //   0fb608               | movzx               ecx, byte ptr [eax]
            //   0bca                 | or                  ecx, edx
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   0355fc               | add                 edx, dword ptr [ebp - 4]
            //   880a                 | mov                 byte ptr [edx], cl

        $sequence_4 = { ff15???????? 898558ffffff 8b5580 8b4580 03423c }
            // n = 5, score = 1200
            //   ff15????????         |                     
            //   898558ffffff         | mov                 dword ptr [ebp - 0xa8], eax
            //   8b5580               | mov                 edx, dword ptr [ebp - 0x80]
            //   8b4580               | mov                 eax, dword ptr [ebp - 0x80]
            //   03423c               | add                 eax, dword ptr [edx + 0x3c]

        $sequence_5 = { 53 6a02 5b 8b4e04 49 0f84d8000000 49 }
            // n = 7, score = 1200
            //   53                   | push                ebx
            //   6a02                 | push                2
            //   5b                   | pop                 ebx
            //   8b4e04               | mov                 ecx, dword ptr [esi + 4]
            //   49                   | dec                 ecx
            //   0f84d8000000         | je                  0xde
            //   49                   | dec                 ecx

        $sequence_6 = { 8b450c 50 ff15???????? 83c404 50 8b4d0c 51 }
            // n = 7, score = 1200
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   50                   | push                eax
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   51                   | push                ecx

        $sequence_7 = { c685dafeffff63 c685dbfeffff41 c685dcfeffff64 c685ddfeffff64 }
            // n = 4, score = 1200
            //   c685dafeffff63       | mov                 byte ptr [ebp - 0x126], 0x63
            //   c685dbfeffff41       | mov                 byte ptr [ebp - 0x125], 0x41
            //   c685dcfeffff64       | mov                 byte ptr [ebp - 0x124], 0x64
            //   c685ddfeffff64       | mov                 byte ptr [ebp - 0x123], 0x64

        $sequence_8 = { 6a00 6a00 8d8560ffffff 50 8b8d5cffffff }
            // n = 5, score = 1200
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   8d8560ffffff         | lea                 eax, [ebp - 0xa0]
            //   50                   | push                eax
            //   8b8d5cffffff         | mov                 ecx, dword ptr [ebp - 0xa4]

        $sequence_9 = { 6890000000 8d8d10ffffff 51 8b9548fdffff 52 8b45c0 50 }
            // n = 7, score = 1200
            //   6890000000           | push                0x90
            //   8d8d10ffffff         | lea                 ecx, [ebp - 0xf0]
            //   51                   | push                ecx
            //   8b9548fdffff         | mov                 edx, dword ptr [ebp - 0x2b8]
            //   52                   | push                edx
            //   8b45c0               | mov                 eax, dword ptr [ebp - 0x40]
            //   50                   | push                eax

    condition:
        7 of them and filesize < 155648
}