rule win_lookback_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2020-12-22"
        version = "1"
        description = "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.lookback"
        malpedia_rule_date = "20201222"
        malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130"
        malpedia_version = "20201023"
        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 = { 57 33db b940000000 33c0 8d7c241c f3ab }
            // n = 6, score = 200
            //   57                   | push                edi
            //   33db                 | xor                 ebx, ebx
            //   b940000000           | mov                 ecx, 0x40
            //   33c0                 | xor                 eax, eax
            //   8d7c241c             | lea                 edi, [esp + 0x1c]
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_1 = { 50 68???????? 57 57 ff15???????? 8d4c242c a3???????? }
            // n = 7, score = 200
            //   50                   | push                eax
            //   68????????           |                     
            //   57                   | push                edi
            //   57                   | push                edi
            //   ff15????????         |                     
            //   8d4c242c             | lea                 ecx, [esp + 0x2c]
            //   a3????????           |                     

        $sequence_2 = { 6802020000 ff15???????? e8???????? 89842448010000 8d442424 8d8c244c010000 50 }
            // n = 7, score = 200
            //   6802020000           | push                0x202
            //   ff15????????         |                     
            //   e8????????           |                     
            //   89842448010000       | mov                 dword ptr [esp + 0x148], eax
            //   8d442424             | lea                 eax, [esp + 0x24]
            //   8d8c244c010000       | lea                 ecx, [esp + 0x14c]
            //   50                   | push                eax

        $sequence_3 = { 3c01 893d???????? 893d???????? 752e }
            // n = 4, score = 200
            //   3c01                 | cmp                 al, 1
            //   893d????????         |                     
            //   893d????????         |                     
            //   752e                 | jne                 0x30

        $sequence_4 = { e8???????? 83c404 c70600000000 c705????????00000000 8b06 85c0 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   c70600000000         | mov                 dword ptr [esi], 0
            //   c705????????00000000     |     
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax

        $sequence_5 = { 74a7 8b06 85c0 757b }
            // n = 4, score = 200
            //   74a7                 | je                  0xffffffa9
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   85c0                 | test                eax, eax
            //   757b                 | jne                 0x7d

        $sequence_6 = { 668b4b06 3be9 7cd0 5f 5e }
            // n = 5, score = 200
            //   668b4b06             | mov                 cx, word ptr [ebx + 6]
            //   3be9                 | cmp                 ebp, ecx
            //   7cd0                 | jl                  0xffffffd2
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_7 = { 8945fc 8945f8 60 648b1d18000000 64a130000000 }
            // n = 5, score = 200
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   60                   | pushal              
            //   648b1d18000000       | mov                 ebx, dword ptr fs:[0x18]
            //   64a130000000         | mov                 eax, dword ptr fs:[0x30]

        $sequence_8 = { 8d442418 57 50 68???????? 57 57 ff15???????? }
            // n = 7, score = 200
            //   8d442418             | lea                 eax, [esp + 0x18]
            //   57                   | push                edi
            //   50                   | push                eax
            //   68????????           |                     
            //   57                   | push                edi
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_9 = { 893d???????? 752e 33db e9???????? 8b15???????? 52 eb06 }
            // n = 7, score = 200
            //   893d????????         |                     
            //   752e                 | jne                 0x30
            //   33db                 | xor                 ebx, ebx
            //   e9????????           |                     
            //   8b15????????         |                     
            //   52                   | push                edx
            //   eb06                 | jmp                 8

    condition:
        7 of them and filesize < 131072
}