rule win_shadowpad_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.shadowpad."
        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.shadowpad"
        malpedia_rule_date = "20220513"
        malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26"
        malpedia_version = "20220516"
        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 = { 7f04 3bc7 7618 83f943 }
            // n = 4, score = 200
            //   7f04                 | jg                  6
            //   3bc7                 | cmp                 eax, edi
            //   7618                 | jbe                 0x1a
            //   83f943               | cmp                 ecx, 0x43

        $sequence_1 = { 5f 5e 33c0 5b c9 c20800 99 }
            // n = 7, score = 200
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c20800               | ret                 8
            //   99                   | cdq                 

        $sequence_2 = { 50 57 ff7508 6a00 68e9fd0000 }
            // n = 5, score = 200
            //   50                   | push                eax
            //   57                   | push                edi
            //   ff7508               | push                dword ptr [ebp + 8]
            //   6a00                 | push                0
            //   68e9fd0000           | push                0xfde9

        $sequence_3 = { 8b442440 2b442410 8b4c2444 1b4c2414 781e }
            // n = 5, score = 200
            //   8b442440             | mov                 eax, dword ptr [esp + 0x40]
            //   2b442410             | sub                 eax, dword ptr [esp + 0x10]
            //   8b4c2444             | mov                 ecx, dword ptr [esp + 0x44]
            //   1b4c2414             | sbb                 ecx, dword ptr [esp + 0x14]
            //   781e                 | js                  0x20

        $sequence_4 = { 8d440701 3b450c 0f8d85000000 41 }
            // n = 4, score = 200
            //   8d440701             | lea                 eax, [edi + eax + 1]
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]
            //   0f8d85000000         | jge                 0x8b
            //   41                   | inc                 ecx

        $sequence_5 = { 58 668945b0 8b07 8945b4 0fb74658 50 }
            // n = 6, score = 200
            //   58                   | pop                 eax
            //   668945b0             | mov                 word ptr [ebp - 0x50], ax
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   8945b4               | mov                 dword ptr [ebp - 0x4c], eax
            //   0fb74658             | movzx               eax, word ptr [esi + 0x58]
            //   50                   | push                eax

        $sequence_6 = { 50 e8???????? 83660c00 59 c3 57 }
            // n = 6, score = 200
            //   50                   | push                eax
            //   e8????????           |                     
            //   83660c00             | and                 dword ptr [esi + 0xc], 0
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   57                   | push                edi

        $sequence_7 = { 0fb74658 50 ffd3 668945b2 8d45b0 50 }
            // n = 6, score = 200
            //   0fb74658             | movzx               eax, word ptr [esi + 0x58]
            //   50                   | push                eax
            //   ffd3                 | call                ebx
            //   668945b2             | mov                 word ptr [ebp - 0x4e], ax
            //   8d45b0               | lea                 eax, [ebp - 0x50]
            //   50                   | push                eax

        $sequence_8 = { 8bfe 8d45e8 895de8 895dec 895df4 895df0 885df8 }
            // n = 7, score = 200
            //   8bfe                 | mov                 edi, esi
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   895de8               | mov                 dword ptr [ebp - 0x18], ebx
            //   895dec               | mov                 dword ptr [ebp - 0x14], ebx
            //   895df4               | mov                 dword ptr [ebp - 0xc], ebx
            //   895df0               | mov                 dword ptr [ebp - 0x10], ebx
            //   885df8               | mov                 byte ptr [ebp - 8], bl

        $sequence_9 = { 6a02 5f 8d45e8 e8???????? }
            // n = 4, score = 200
            //   6a02                 | push                2
            //   5f                   | pop                 edi
            //   8d45e8               | lea                 eax, [ebp - 0x18]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 188416
}