rule win_lookback_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.lookback."
        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.lookback"
        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 = { 0f8407020000 8b35???????? 57 57 57 }
            // n = 5, score = 200
            //   0f8407020000         | je                  0x20d
            //   8b35????????         |                     
            //   57                   | push                edi
            //   57                   | push                edi
            //   57                   | push                edi

        $sequence_1 = { 56 57 8b7c2418 8b473c 8b8c38a0000000 }
            // n = 5, score = 200
            //   56                   | push                esi
            //   57                   | push                edi
            //   8b7c2418             | mov                 edi, dword ptr [esp + 0x18]
            //   8b473c               | mov                 eax, dword ptr [edi + 0x3c]
            //   8b8c38a0000000       | mov                 ecx, dword ptr [eax + edi + 0xa0]

        $sequence_2 = { c3 5e 5d 33c0 5b 81c410070000 c3 }
            // n = 7, score = 200
            //   c3                   | ret                 
            //   5e                   | pop                 esi
            //   5d                   | pop                 ebp
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   81c410070000         | add                 esp, 0x710
            //   c3                   | ret                 

        $sequence_3 = { 8bc3 7446 83b89001000006 7514 }
            // n = 4, score = 200
            //   8bc3                 | mov                 eax, ebx
            //   7446                 | je                  0x48
            //   83b89001000006       | cmp                 dword ptr [eax + 0x190], 6
            //   7514                 | jne                 0x16

        $sequence_4 = { 57 8945fc 8945f8 60 648b1d18000000 64a130000000 8b98a8000000 }
            // n = 7, score = 200
            //   57                   | push                edi
            //   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]
            //   8b98a8000000         | mov                 ebx, dword ptr [eax + 0xa8]

        $sequence_5 = { 0f8407020000 8b35???????? 57 57 57 57 ffd6 }
            // n = 7, score = 200
            //   0f8407020000         | je                  0x20d
            //   8b35????????         |                     
            //   57                   | push                edi
            //   57                   | push                edi
            //   57                   | push                edi
            //   57                   | push                edi
            //   ffd6                 | call                esi

        $sequence_6 = { 72e4 53 55 33c0 56 }
            // n = 5, score = 200
            //   72e4                 | jb                  0xffffffe6
            //   53                   | push                ebx
            //   55                   | push                ebp
            //   33c0                 | xor                 eax, eax
            //   56                   | push                esi

        $sequence_7 = { 83ec08 53 33c0 56 57 8945fc 8945f8 }
            // n = 7, score = 200
            //   83ec08               | sub                 esp, 8
            //   53                   | push                ebx
            //   33c0                 | xor                 eax, eax
            //   56                   | push                esi
            //   57                   | push                edi
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_8 = { 8b1d???????? 8b35???????? a1???????? 3bc7 740d 50 }
            // n = 6, score = 200
            //   8b1d????????         |                     
            //   8b35????????         |                     
            //   a1????????           |                     
            //   3bc7                 | cmp                 eax, edi
            //   740d                 | je                  0xf
            //   50                   | push                eax

        $sequence_9 = { e8???????? 83c40c 89442412 be???????? }
            // n = 4, score = 200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   89442412             | mov                 dword ptr [esp + 0x12], eax
            //   be????????           |                     

    condition:
        7 of them and filesize < 131072
}