rule win_locky_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.locky."
        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.locky"
        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 = { ffd6 53 e8???????? 8b45f0 59 e9???????? }
            // n = 6, score = 2100
            //   ffd6                 | call                esi
            //   53                   | push                ebx
            //   e8????????           |                     
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   59                   | pop                 ecx
            //   e9????????           |                     

        $sequence_1 = { 5b c9 c3 b301 ebf0 b8???????? }
            // n = 6, score = 2100
            //   5b                   | pop                 ebx
            //   c9                   | leave               
            //   c3                   | ret                 
            //   b301                 | mov                 bl, 1
            //   ebf0                 | jmp                 0xfffffff2
            //   b8????????           |                     

        $sequence_2 = { 0d00000020 50 51 c745fc04000000 ff15???????? 85c0 }
            // n = 6, score = 2100
            //   0d00000020           | or                  eax, 0x20000000
            //   50                   | push                eax
            //   51                   | push                ecx
            //   c745fc04000000       | mov                 dword ptr [ebp - 4], 4
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax

        $sequence_3 = { 8d45b8 c645fc08 e8???????? 83c414 6a01 33ff }
            // n = 6, score = 2100
            //   8d45b8               | lea                 eax, [ebp - 0x48]
            //   c645fc08             | mov                 byte ptr [ebp - 4], 8
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   6a01                 | push                1
            //   33ff                 | xor                 edi, edi

        $sequence_4 = { 899d70ffffff 898578ffffff ffd7 8bf0 8975e0 3bf3 7505 }
            // n = 7, score = 2100
            //   899d70ffffff         | mov                 dword ptr [ebp - 0x90], ebx
            //   898578ffffff         | mov                 dword ptr [ebp - 0x88], eax
            //   ffd7                 | call                edi
            //   8bf0                 | mov                 esi, eax
            //   8975e0               | mov                 dword ptr [ebp - 0x20], esi
            //   3bf3                 | cmp                 esi, ebx
            //   7505                 | jne                 7

        $sequence_5 = { 7705 8975e8 eb20 6a10 58 663bc8 }
            // n = 6, score = 2100
            //   7705                 | ja                  7
            //   8975e8               | mov                 dword ptr [ebp - 0x18], esi
            //   eb20                 | jmp                 0x22
            //   6a10                 | push                0x10
            //   58                   | pop                 eax
            //   663bc8               | cmp                 cx, ax

        $sequence_6 = { 8bec 51 51 834e0cff 8d463c }
            // n = 5, score = 2100
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   51                   | push                ecx
            //   834e0cff             | or                  dword ptr [esi + 0xc], 0xffffffff
            //   8d463c               | lea                 eax, [esi + 0x3c]

        $sequence_7 = { 837de408 8b4dd0 7303 8d4dd0 8d440002 50 8b4508 }
            // n = 7, score = 2100
            //   837de408             | cmp                 dword ptr [ebp - 0x1c], 8
            //   8b4dd0               | mov                 ecx, dword ptr [ebp - 0x30]
            //   7303                 | jae                 5
            //   8d4dd0               | lea                 ecx, [ebp - 0x30]
            //   8d440002             | lea                 eax, [eax + eax + 2]
            //   50                   | push                eax
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_8 = { 03d3 5b c21000 e9???????? 8bff 55 }
            // n = 6, score = 1400
            //   03d3                 | add                 edx, ebx
            //   5b                   | pop                 ebx
            //   c21000               | ret                 0x10
            //   e9????????           |                     
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp

        $sequence_9 = { 5e 90 e9???????? 90 8d09 }
            // n = 5, score = 700
            //   5e                   | pop                 esi
            //   90                   | nop                 
            //   e9????????           |                     
            //   90                   | nop                 
            //   8d09                 | lea                 ecx, [ecx]

        $sequence_10 = { 83c40c e9???????? 90 8d00 }
            // n = 4, score = 700
            //   83c40c               | add                 esp, 0xc
            //   e9????????           |                     
            //   90                   | nop                 
            //   8d00                 | lea                 eax, [eax]

        $sequence_11 = { 66ab 90 e9???????? 8d12 90 }
            // n = 5, score = 700
            //   66ab                 | stosw               word ptr es:[edi], ax
            //   90                   | nop                 
            //   e9????????           |                     
            //   8d12                 | lea                 edx, [edx]
            //   90                   | nop                 

        $sequence_12 = { 6a63 e9???????? 90 89c8 }
            // n = 4, score = 700
            //   6a63                 | push                0x63
            //   e9????????           |                     
            //   90                   | nop                 
            //   89c8                 | mov                 eax, ecx

        $sequence_13 = { 6a01 e9???????? 90 e8???????? }
            // n = 4, score = 700
            //   6a01                 | push                1
            //   e9????????           |                     
            //   90                   | nop                 
            //   e8????????           |                     

        $sequence_14 = { 6a6f 90 e9???????? 58 }
            // n = 4, score = 700
            //   6a6f                 | push                0x6f
            //   90                   | nop                 
            //   e9????????           |                     
            //   58                   | pop                 eax

        $sequence_15 = { 6a01 90 e9???????? 8d3f }
            // n = 4, score = 700
            //   6a01                 | push                1
            //   90                   | nop                 
            //   e9????????           |                     
            //   8d3f                 | lea                 edi, [edi]

        $sequence_16 = { 5e c21000 8bff 55 8bec 33c0 8b4d08 }
            // n = 7, score = 700
            //   5e                   | pop                 esi
            //   c21000               | ret                 0x10
            //   8bff                 | mov                 edi, edi
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   33c0                 | xor                 eax, eax
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]

    condition:
        7 of them and filesize < 1122304
}