rule win_acbackdoor_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.acbackdoor."
        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.acbackdoor"
        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 = { 8b442448 89742404 89442408 a1???????? 891c24 ff5034 85c0 }
            // n = 7, score = 100
            //   8b442448             | mov                 eax, dword ptr [esp + 0x48]
            //   89742404             | mov                 dword ptr [esp + 4], esi
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   a1????????           |                     
            //   891c24               | mov                 dword ptr [esp], ebx
            //   ff5034               | call                dword ptr [eax + 0x34]
            //   85c0                 | test                eax, eax

        $sequence_1 = { c744240410000000 890424 e8???????? 85c0 0f844c060000 893424 8944241c }
            // n = 7, score = 100
            //   c744240410000000     | mov                 dword ptr [esp + 4], 0x10
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f844c060000         | je                  0x652
            //   893424               | mov                 dword ptr [esp], esi
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax

        $sequence_2 = { e8???????? 89c6 85c0 0f847f000000 8b842450020000 c744241000000000 c744240c00000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   89c6                 | mov                 esi, eax
            //   85c0                 | test                eax, eax
            //   0f847f000000         | je                  0x85
            //   8b842450020000       | mov                 eax, dword ptr [esp + 0x250]
            //   c744241000000000     | mov                 dword ptr [esp + 0x10], 0
            //   c744240c00000000     | mov                 dword ptr [esp + 0xc], 0

        $sequence_3 = { 89442404 891c24 e8???????? 85c0 7426 c744240440000000 893424 }
            // n = 7, score = 100
            //   89442404             | mov                 dword ptr [esp + 4], eax
            //   891c24               | mov                 dword ptr [esp], ebx
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   7426                 | je                  0x28
            //   c744240440000000     | mov                 dword ptr [esp + 4], 0x40
            //   893424               | mov                 dword ptr [esp], esi

        $sequence_4 = { ff15???????? 3b6c2410 75e3 8b542414 89d8 8b5c241c 85d2 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   3b6c2410             | cmp                 ebp, dword ptr [esp + 0x10]
            //   75e3                 | jne                 0xffffffe5
            //   8b542414             | mov                 edx, dword ptr [esp + 0x14]
            //   89d8                 | mov                 eax, ebx
            //   8b5c241c             | mov                 ebx, dword ptr [esp + 0x1c]
            //   85d2                 | test                edx, edx

        $sequence_5 = { 8bb424a0000000 83e20f 8d34d6 8b542428 8b86c0000000 337e44 83e20f }
            // n = 7, score = 100
            //   8bb424a0000000       | mov                 esi, dword ptr [esp + 0xa0]
            //   83e20f               | and                 edx, 0xf
            //   8d34d6               | lea                 esi, [esi + edx*8]
            //   8b542428             | mov                 edx, dword ptr [esp + 0x28]
            //   8b86c0000000         | mov                 eax, dword ptr [esi + 0xc0]
            //   337e44               | xor                 edi, dword ptr [esi + 0x44]
            //   83e20f               | and                 edx, 0xf

        $sequence_6 = { ff15???????? e9???????? 81ff80400000 751a c7442408???????? 895c2404 893424 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   e9????????           |                     
            //   81ff80400000         | cmp                 edi, 0x4080
            //   751a                 | jne                 0x1c
            //   c7442408????????     |                     
            //   895c2404             | mov                 dword ptr [esp + 4], ebx
            //   893424               | mov                 dword ptr [esp], esi

        $sequence_7 = { c7442458a4e14a00 c78424a400000000000000 e8???????? 8d8424b4000000 890424 e8???????? 8d8424c0000000 }
            // n = 7, score = 100
            //   c7442458a4e14a00     | mov                 dword ptr [esp + 0x58], 0x4ae1a4
            //   c78424a400000000000000     | mov    dword ptr [esp + 0xa4], 0
            //   e8????????           |                     
            //   8d8424b4000000       | lea                 eax, [esp + 0xb4]
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     
            //   8d8424c0000000       | lea                 eax, [esp + 0xc0]

        $sequence_8 = { e9???????? ba80bfffff e9???????? baf0ffffff e9???????? 890424 e8???????? }
            // n = 7, score = 100
            //   e9????????           |                     
            //   ba80bfffff           | mov                 edx, 0xffffbf80
            //   e9????????           |                     
            //   baf0ffffff           | mov                 edx, 0xfffffff0
            //   e9????????           |                     
            //   890424               | mov                 dword ptr [esp], eax
            //   e8????????           |                     

        $sequence_9 = { e9???????? dfabe00a0000 d835???????? 31c0 dd1a e9???????? dfabf80a0000 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   dfabe00a0000         | fild                qword ptr [ebx + 0xae0]
            //   d835????????         |                     
            //   31c0                 | xor                 eax, eax
            //   dd1a                 | fstp                qword ptr [edx]
            //   e9????????           |                     
            //   dfabf80a0000         | fild                qword ptr [ebx + 0xaf8]

    condition:
        7 of them and filesize < 1704960
}