rule win_regretlocker_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.regretlocker."
        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.regretlocker"
        malpedia_rule_date = "20230124"
        malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686"
        malpedia_version = "20230125"
        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 = { 74ba 83f807 77c5 ff248568714300 8bce e8???????? eb45 }
            // n = 7, score = 100
            //   74ba                 | je                  0xffffffbc
            //   83f807               | cmp                 eax, 7
            //   77c5                 | ja                  0xffffffc7
            //   ff248568714300       | jmp                 dword ptr [eax*4 + 0x437168]
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   eb45                 | jmp                 0x47

        $sequence_1 = { 56 53 50 e8???????? 83c40c 8d45ec 50 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8d45ec               | lea                 eax, [ebp - 0x14]
            //   50                   | push                eax

        $sequence_2 = { 50 895e10 895e14 e8???????? 8d4dd8 e8???????? 8bc6 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   895e10               | mov                 dword ptr [esi + 0x10], ebx
            //   895e14               | mov                 dword ptr [esi + 0x14], ebx
            //   e8????????           |                     
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   e8????????           |                     
            //   8bc6                 | mov                 eax, esi

        $sequence_3 = { 8d4e10 89442408 8d442408 50 e8???????? 8d4804 }
            // n = 6, score = 100
            //   8d4e10               | lea                 ecx, [esi + 0x10]
            //   89442408             | mov                 dword ptr [esp + 8], eax
            //   8d442408             | lea                 eax, [esp + 8]
            //   50                   | push                eax
            //   e8????????           |                     
            //   8d4804               | lea                 ecx, [eax + 4]

        $sequence_4 = { 8bce e8???????? 8b45fc ff75f0 894610 8b4304 83c014 }
            // n = 7, score = 100
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   ff75f0               | push                dword ptr [ebp - 0x10]
            //   894610               | mov                 dword ptr [esi + 0x10], eax
            //   8b4304               | mov                 eax, dword ptr [ebx + 4]
            //   83c014               | add                 eax, 0x14

        $sequence_5 = { c9 c21800 8a410d c3 55 8bec ff7114 }
            // n = 7, score = 100
            //   c9                   | leave               
            //   c21800               | ret                 0x18
            //   8a410d               | mov                 al, byte ptr [ecx + 0xd]
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   ff7114               | push                dword ptr [ecx + 0x14]

        $sequence_6 = { 5b 8be5 5d c21400 55 8bec 81eccc040000 }
            // n = 7, score = 100
            //   5b                   | pop                 ebx
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c21400               | ret                 0x14
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81eccc040000         | sub                 esp, 0x4cc

        $sequence_7 = { 59 68???????? e9???????? 0f28c1 f20f5e45e4 660f2fc2 }
            // n = 6, score = 100
            //   59                   | pop                 ecx
            //   68????????           |                     
            //   e9????????           |                     
            //   0f28c1               | movaps              xmm0, xmm1
            //   f20f5e45e4           | divsd               xmm0, qword ptr [ebp - 0x1c]
            //   660f2fc2             | comisd              xmm0, xmm2

        $sequence_8 = { 81ec9c010000 8b4508 53 56 8bf1 57 8975fc }
            // n = 7, score = 100
            //   81ec9c010000         | sub                 esp, 0x19c
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   56                   | push                esi
            //   8bf1                 | mov                 esi, ecx
            //   57                   | push                edi
            //   8975fc               | mov                 dword ptr [ebp - 4], esi

        $sequence_9 = { 8d4e24 e8???????? 8d4e04 e8???????? c7066c920010 5e c3 }
            // n = 7, score = 100
            //   8d4e24               | lea                 ecx, [esi + 0x24]
            //   e8????????           |                     
            //   8d4e04               | lea                 ecx, [esi + 4]
            //   e8????????           |                     
            //   c7066c920010         | mov                 dword ptr [esi], 0x1000926c
            //   5e                   | pop                 esi
            //   c3                   | ret                 

    condition:
        7 of them and filesize < 1021952
}