rule win_svcready_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-12-06"
        version = "1"
        description = "Detects win.svcready."
        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.svcready"
        malpedia_rule_date = "20231130"
        malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351"
        malpedia_version = "20230808"
        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 = { 33c8 c1ca0d 33ce 8bc3 33c1 c1ce03 894c2418 }
            // n = 7, score = 500
            //   33c8                 | xor                 ecx, eax
            //   c1ca0d               | ror                 edx, 0xd
            //   33ce                 | xor                 ecx, esi
            //   8bc3                 | mov                 eax, ebx
            //   33c1                 | xor                 eax, ecx
            //   c1ce03               | ror                 esi, 3
            //   894c2418             | mov                 dword ptr [esp + 0x18], ecx

        $sequence_1 = { 83611000 c741140f000000 68???????? c60100 e8???????? 8365fc00 }
            // n = 6, score = 500
            //   83611000             | and                 dword ptr [ecx + 0x10], 0
            //   c741140f000000       | mov                 dword ptr [ecx + 0x14], 0xf
            //   68????????           |                     
            //   c60100               | mov                 byte ptr [ecx], 0
            //   e8????????           |                     
            //   8365fc00             | and                 dword ptr [ebp - 4], 0

        $sequence_2 = { 59 59 895dc0 895dc4 895dc8 8b4df4 8bc6 }
            // n = 7, score = 500
            //   59                   | pop                 ecx
            //   59                   | pop                 ecx
            //   895dc0               | mov                 dword ptr [ebp - 0x40], ebx
            //   895dc4               | mov                 dword ptr [ebp - 0x3c], ebx
            //   895dc8               | mov                 dword ptr [ebp - 0x38], ebx
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { 8904d1 56 ff742410 8d4f04 e8???????? 8b44240c 5f }
            // n = 7, score = 500
            //   8904d1               | mov                 dword ptr [ecx + edx*8], eax
            //   56                   | push                esi
            //   ff742410             | push                dword ptr [esp + 0x10]
            //   8d4f04               | lea                 ecx, [edi + 4]
            //   e8????????           |                     
            //   8b44240c             | mov                 eax, dword ptr [esp + 0xc]
            //   5f                   | pop                 edi

        $sequence_4 = { 8bd8 8a0b 80f97f 0f855fffffff 8b54240c 8b4d18 }
            // n = 6, score = 500
            //   8bd8                 | mov                 ebx, eax
            //   8a0b                 | mov                 cl, byte ptr [ebx]
            //   80f97f               | cmp                 cl, 0x7f
            //   0f855fffffff         | jne                 0xffffff65
            //   8b54240c             | mov                 edx, dword ptr [esp + 0xc]
            //   8b4d18               | mov                 ecx, dword ptr [ebp + 0x18]

        $sequence_5 = { d1cb 33d5 8bc7 c1e003 33da c1cd07 }
            // n = 6, score = 500
            //   d1cb                 | ror                 ebx, 1
            //   33d5                 | xor                 edx, ebp
            //   8bc7                 | mov                 eax, edi
            //   c1e003               | shl                 eax, 3
            //   33da                 | xor                 ebx, edx
            //   c1cd07               | ror                 ebp, 7

        $sequence_6 = { 33c3 8bd7 33c5 0bd3 8bda 0bd1 33d9 }
            // n = 7, score = 500
            //   33c3                 | xor                 eax, ebx
            //   8bd7                 | mov                 edx, edi
            //   33c5                 | xor                 eax, ebp
            //   0bd3                 | or                  edx, ebx
            //   8bda                 | mov                 ebx, edx
            //   0bd1                 | or                  edx, ecx
            //   33d9                 | xor                 ebx, ecx

        $sequence_7 = { e8???????? 83c414 eb1a 53 57 e8???????? 668b442430 }
            // n = 7, score = 500
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   eb1a                 | jmp                 0x1c
            //   53                   | push                ebx
            //   57                   | push                edi
            //   e8????????           |                     
            //   668b442430           | mov                 ax, word ptr [esp + 0x30]

        $sequence_8 = { c645fc01 8d45d8 ff7508 53 6a10 83ec18 8bcc }
            // n = 7, score = 500
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   6a10                 | push                0x10
            //   83ec18               | sub                 esp, 0x18
            //   8bcc                 | mov                 ecx, esp

        $sequence_9 = { 7607 bbffffff7f eb0a b816000000 3bd8 0f42d8 8d4b01 }
            // n = 7, score = 500
            //   7607                 | jbe                 9
            //   bbffffff7f           | mov                 ebx, 0x7fffffff
            //   eb0a                 | jmp                 0xc
            //   b816000000           | mov                 eax, 0x16
            //   3bd8                 | cmp                 ebx, eax
            //   0f42d8               | cmovb               ebx, eax
            //   8d4b01               | lea                 ecx, [ebx + 1]

    condition:
        7 of them and filesize < 1187840
}

rule win_svcready_w0 { 
   meta: 
        author = "@AndreGironda"
        description = "packed SVCReady / win.svcready"
        hash = "76d69ec491c0711f6cc60fbafcabf095"
        date = "June 8, 2022"
        tlp = "White"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.svcready"
        malpedia_rule_date = "20220608"
        malpedia_hash = ""
        malpedia_version = "20220609"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

   strings:
        $hex_1003b3e0 = { 52 75 6e 50 45 44 6c 6c 4e 61 74 69 76 65 3a 3a 46 69 6c 65 20 68 61 73 20 6e 6f 20 72 65 6c 6f 63 61 74 69 6f 6e }
        $hex_1003b424 = { 50 61 79 6c 6f 61 64 20 64 65 70 6c 6f 79 6d 65 6e 74 20 66 61 69 6c 65 64 2c 20 73 74 6f 70 70 69 6e 67 }
        $hex_1003c234 = { 4e 6f 74 20 73 75 70 70 6f 72 74 65 64 20 72 65 6c 6f 63 61 74 69 6f 6e 73 20 66 6f 72 6d 61 74 20 61 74 20 25 64 3a 20 25 64 0a 00 5b 2d 5d 20 }
        $hex_1003c2cc = { 49 6e 76 61 6c 69 64 20 61 64 64 72 65 73 73 20 6f 66 20 72 65 6c 6f 63 61 74 69 6f 6e 73 20 62 6c 6f 63 6b }

   condition:
        all of them
}