rule win_meterpreter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-05-16"
        version = "1"
        description = "Detects win.meterpreter."
        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.meterpreter"
        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 = { f2008cf8ff0f8537 0100 008b35d8c140 00ff d6 85c0 }
            // n = 6, score = 200
            //   f2008cf8ff0f8537     | add                 byte ptr [eax + edi*8 + 0x37850fff], cl
            //   0100                 | add                 dword ptr [eax], eax
            //   008b35d8c140         | add                 byte ptr [ebx + 0x40c1d835], cl
            //   00ff                 | add                 bh, bh
            //   d6                   | salc                
            //   85c0                 | test                eax, eax

        $sequence_1 = { 5f 5e b816ef2d00 5b }
            // n = 4, score = 200
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   b816ef2d00           | mov                 eax, 0x2def16
            //   5b                   | pop                 ebx

        $sequence_2 = { 54 55 1085d2740b51 e8???????? }
            // n = 4, score = 200
            //   54                   | push                esp
            //   55                   | push                ebp
            //   1085d2740b51         | adc                 byte ptr [ebp + 0x510b74d2], al
            //   e8????????           |                     

        $sequence_3 = { 06 c07431a1ec 0541c18b7e 0485 c0751850 68ec814100 }
            // n = 6, score = 200
            //   06                   | push                es
            //   c07431a1ec           | sal                 byte ptr [ecx + esi - 0x5f], 0xec
            //   0541c18b7e           | add                 eax, 0x7e8bc141
            //   0485                 | add                 al, 0x85
            //   c0751850             | sal                 byte ptr [ebp + 0x18], 0x50
            //   68ec814100           | push                0x4181ec

        $sequence_4 = { 8b1b 50 ffd6 83c404 85db 75f2 8b45f4 }
            // n = 7, score = 200
            //   8b1b                 | mov                 ebx, dword ptr [ebx]
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   83c404               | add                 esp, 4
            //   85db                 | test                ebx, ebx
            //   75f2                 | jne                 0xfffffff4
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]

        $sequence_5 = { 55 8bec 81eca00086f1 53 8b5d08 56 }
            // n = 6, score = 200
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   81eca00086f1         | sub                 esp, 0xf18600a0
            //   53                   | push                ebx
            //   8b5d08               | mov                 ebx, dword ptr [ebp + 8]
            //   56                   | push                esi

        $sequence_6 = { 0c8b 4d 085356 57 16 7d14 85c0 }
            // n = 7, score = 200
            //   0c8b                 | or                  al, 0x8b
            //   4d                   | dec                 ebp
            //   085356               | or                  byte ptr [ebx + 0x56], dl
            //   57                   | push                edi
            //   16                   | push                ss
            //   7d14                 | jge                 0x16
            //   85c0                 | test                eax, eax

        $sequence_7 = { 8be5 5d c20800 63d6 5f 5e 0580fc0afa }
            // n = 7, score = 200
            //   8be5                 | mov                 esp, ebp
            //   5d                   | pop                 ebp
            //   c20800               | ret                 8
            //   63d6                 | arpl                si, dx
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   0580fc0afa           | add                 eax, 0xfa0afc80

        $sequence_8 = { 72ff 216a5c 57 8bf0 ffd3 83c410 3bf0 }
            // n = 7, score = 200
            //   72ff                 | jb                  1
            //   216a5c               | and                 dword ptr [edx + 0x5c], ebp
            //   57                   | push                edi
            //   8bf0                 | mov                 esi, eax
            //   ffd3                 | call                ebx
            //   83c410               | add                 esp, 0x10
            //   3bf0                 | cmp                 esi, eax

        $sequence_9 = { 90 90 55 8b31 058b750856 e8???????? 83c404 }
            // n = 7, score = 200
            //   90                   | nop                 
            //   90                   | nop                 
            //   55                   | push                ebp
            //   8b31                 | mov                 esi, dword ptr [ecx]
            //   058b750856           | add                 eax, 0x5608758b
            //   e8????????           |                     
            //   83c404               | add                 esp, 4

    condition:
        7 of them and filesize < 188416
}