rule win_asprox_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        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 = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { 85c0 752c 8b4d10 8b11 52 8b45f8 50 }
            // n = 7, score = 1200
            //   85c0                 | test                eax, eax
            //   752c                 | jne                 0x2e
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   8b11                 | mov                 edx, dword ptr [ecx]
            //   52                   | push                edx
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   50                   | push                eax

        $sequence_1 = { 837b2001 7cc3 8b5320 8b431c 8d4aff d3e8 8b4dfc }
            // n = 7, score = 1200
            //   837b2001             | cmp                 dword ptr [ebx + 0x20], 1
            //   7cc3                 | jl                  0xffffffc5
            //   8b5320               | mov                 edx, dword ptr [ebx + 0x20]
            //   8b431c               | mov                 eax, dword ptr [ebx + 0x1c]
            //   8d4aff               | lea                 ecx, [edx - 1]
            //   d3e8                 | shr                 eax, cl
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]

        $sequence_2 = { 50 ff15???????? 83c404 8b8dacfbffff 51 ff15???????? 83c404 }
            // n = 7, score = 1200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4
            //   8b8dacfbffff         | mov                 ecx, dword ptr [ebp - 0x454]
            //   51                   | push                ecx
            //   ff15????????         |                     
            //   83c404               | add                 esp, 4

        $sequence_3 = { 7cde 8b4dfc 89848de0fbffff 83fa01 0f8f37feffff 8b7d10 33d2 }
            // n = 7, score = 1200
            //   7cde                 | jl                  0xffffffe0
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   89848de0fbffff       | mov                 dword ptr [ebp + ecx*4 - 0x420], eax
            //   83fa01               | cmp                 edx, 1
            //   0f8f37feffff         | jg                  0xfffffe3d
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   33d2                 | xor                 edx, edx

        $sequence_4 = { 8b4210 8a5108 8810 8b91600c0000 0fb65908 }
            // n = 5, score = 1200
            //   8b4210               | mov                 eax, dword ptr [edx + 0x10]
            //   8a5108               | mov                 dl, byte ptr [ecx + 8]
            //   8810                 | mov                 byte ptr [eax], dl
            //   8b91600c0000         | mov                 edx, dword ptr [ecx + 0xc60]
            //   0fb65908             | movzx               ebx, byte ptr [ecx + 8]

        $sequence_5 = { 8b15???????? 52 ff15???????? 898548feffff 6800100000 6a00 a1???????? }
            // n = 7, score = 1200
            //   8b15????????         |                     
            //   52                   | push                edx
            //   ff15????????         |                     
            //   898548feffff         | mov                 dword ptr [ebp - 0x1b8], eax
            //   6800100000           | push                0x1000
            //   6a00                 | push                0
            //   a1????????           |                     

        $sequence_6 = { 6a01 68???????? 6a00 8d85fcfdffff 50 ff15???????? 6800100000 }
            // n = 7, score = 1200
            //   6a01                 | push                1
            //   68????????           |                     
            //   6a00                 | push                0
            //   8d85fcfdffff         | lea                 eax, [ebp - 0x204]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   6800100000           | push                0x1000

        $sequence_7 = { 57 395d08 0f8498000000 8b750c 3bf3 0f848d000000 8b7d10 }
            // n = 7, score = 1200
            //   57                   | push                edi
            //   395d08               | cmp                 dword ptr [ebp + 8], ebx
            //   0f8498000000         | je                  0x9e
            //   8b750c               | mov                 esi, dword ptr [ebp + 0xc]
            //   3bf3                 | cmp                 esi, ebx
            //   0f848d000000         | je                  0x93
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]

        $sequence_8 = { 50 ff15???????? c745e800000000 c7856cffffff00000000 8d4df4 51 8d956cffffff }
            // n = 7, score = 1200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   c7856cffffff00000000     | mov    dword ptr [ebp - 0x94], 0
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   51                   | push                ecx
            //   8d956cffffff         | lea                 edx, [ebp - 0x94]

        $sequence_9 = { 8b450c 8b4d10 c6044100 8be5 }
            // n = 4, score = 1200
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   c6044100             | mov                 byte ptr [ecx + eax*2], 0
            //   8be5                 | mov                 esp, ebp

    condition:
        7 of them and filesize < 155648
}