rule win_meterpreter_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        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 = "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 = { e22b e5f6 4f 1c8b }
            // n = 4, score = 200
            //   e22b                 | loop                0x2d
            //   e5f6                 | in                  eax, 0xf6
            //   4f                   | dec                 edi
            //   1c8b                 | sbb                 al, 0x8b

        $sequence_1 = { 90 90 90 55 e4ec 53 8b22 }
            // n = 7, score = 200
            //   90                   | nop                 
            //   90                   | nop                 
            //   90                   | nop                 
            //   55                   | push                ebp
            //   e4ec                 | in                  al, 0xec
            //   53                   | push                ebx
            //   8b22                 | mov                 esp, dword ptr [edx]

        $sequence_2 = { 50 686cd4408e ffd6 8b0d???????? 83c18a }
            // n = 5, score = 200
            //   50                   | push                eax
            //   686cd4408e           | push                0x8e40d46c
            //   ffd6                 | call                esi
            //   8b0d????????         |                     
            //   83c18a               | add                 ecx, -0x76

        $sequence_3 = { 008b35a8c19f 006860 2f 0000 52 ffd6 }
            // n = 6, score = 200
            //   008b35a8c19f         | add                 byte ptr [ebx - 0x603e57cb], cl
            //   006860               | add                 byte ptr [eax + 0x60], ch
            //   2f                   | das                 
            //   0000                 | add                 byte ptr [eax], al
            //   52                   | push                edx
            //   ffd6                 | call                esi

        $sequence_4 = { 8b87047945f4 6a01 50 52 c745fc00000000 ff08 98 }
            // n = 7, score = 200
            //   8b87047945f4         | mov                 eax, dword ptr [edi - 0xbba86fc]
            //   6a01                 | push                1
            //   50                   | push                eax
            //   52                   | push                edx
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   ff08                 | dec                 dword ptr [eax]
            //   98                   | cwde                

        $sequence_5 = { 57 40 388bf083c4cf 86f6 }
            // n = 4, score = 200
            //   57                   | push                edi
            //   40                   | inc                 eax
            //   388bf083c4cf         | cmp                 byte ptr [ebx - 0x303b7c10], cl
            //   86f6                 | xchg                dh, dh

        $sequence_6 = { 8932 8b700c 83c204 4e 3bce 74ef ff9a0c8b5c03 }
            // n = 7, score = 200
            //   8932                 | mov                 dword ptr [edx], esi
            //   8b700c               | mov                 esi, dword ptr [eax + 0xc]
            //   83c204               | add                 edx, 4
            //   4e                   | dec                 esi
            //   3bce                 | cmp                 ecx, esi
            //   74ef                 | je                  0xfffffff1
            //   ff9a0c8b5c03         | lcall               [edx + 0x35c8b0c]

        $sequence_7 = { 043b 8801 41 0fc2049088 0135???????? 4f 75b5 }
            // n = 7, score = 200
            //   043b                 | add                 al, 0x3b
            //   8801                 | mov                 byte ptr [ecx], al
            //   41                   | inc                 ecx
            //   0fc2049088           | cmpps               xmm0, xmmword ptr [eax + edx*4], 0x88
            //   0135????????         |                     
            //   4f                   | dec                 edi
            //   75b5                 | jne                 0xffffffb7

        $sequence_8 = { 6c 50 048b 55 1491 48 }
            // n = 6, score = 200
            //   6c                   | insb                byte ptr es:[edi], dx
            //   50                   | push                eax
            //   048b                 | add                 al, 0x8b
            //   55                   | push                ebp
            //   1491                 | adc                 al, 0x91
            //   48                   | dec                 eax

        $sequence_9 = { 76e1 8bf0 85f6 750e }
            // n = 4, score = 200
            //   76e1                 | jbe                 0xffffffe3
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   750e                 | jne                 0x10

    condition:
        7 of them and filesize < 188416
}