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rule win_medusa_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.medusa."
        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.medusa"
        malpedia_rule_date = "20230705"
        malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41"
        malpedia_version = "20230715"
        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 = { ae 085ffb cf 51 46 a8cf f8 }
            // n = 7, score = 100
            //   ae                   | scasb               al, byte ptr es:[edi]
            //   085ffb               | or                  byte ptr [edi - 5], bl
            //   cf                   | iretd               
            //   51                   | push                ecx
            //   46                   | inc                 esi
            //   a8cf                 | test                al, 0xcf
            //   f8                   | clc                 

        $sequence_1 = { 184e0f 6c 6f aa }
            // n = 4, score = 100
            //   184e0f               | sbb                 byte ptr [esi + 0xf], cl
            //   6c                   | insb                byte ptr es:[edi], dx
            //   6f                   | outsd               dx, dword ptr [esi]
            //   aa                   | stosb               byte ptr es:[edi], al

        $sequence_2 = { d8b8291ba3f9 a939ef568f 46 005f6e 69c7d0234b91 1c14 2a18 }
            // n = 7, score = 100
            //   d8b8291ba3f9         | fdivr               dword ptr [eax - 0x65ce4d7]
            //   a939ef568f           | test                eax, 0x8f56ef39
            //   46                   | inc                 esi
            //   005f6e               | add                 byte ptr [edi + 0x6e], bl
            //   69c7d0234b91         | imul                eax, edi, 0x914b23d0
            //   1c14                 | sbb                 al, 0x14
            //   2a18                 | sub                 bl, byte ptr [eax]

        $sequence_3 = { 51 ff7100 52 ff7200 53 }
            // n = 5, score = 100
            //   51                   | push                ecx
            //   ff7100               | push                dword ptr [ecx]
            //   52                   | push                edx
            //   ff7200               | push                dword ptr [edx]
            //   53                   | push                ebx

        $sequence_4 = { 2048b3 a5 45 b051 9f }
            // n = 5, score = 100
            //   2048b3               | and                 byte ptr [eax - 0x4d], cl
            //   a5                   | movsd               dword ptr es:[edi], dword ptr [esi]
            //   45                   | inc                 ebp
            //   b051                 | mov                 al, 0x51
            //   9f                   | lahf                

        $sequence_5 = { 57 10872213d4b4 5b 00bb4b0c8cb2 }
            // n = 4, score = 100
            //   57                   | push                edi
            //   10872213d4b4         | adc                 byte ptr [edi - 0x4b2becde], al
            //   5b                   | pop                 ebx
            //   00bb4b0c8cb2         | add                 byte ptr [ebx - 0x4d73f3b5], bh

        $sequence_6 = { ab 92 6f 0c48 b5f9 43 }
            // n = 6, score = 100
            //   ab                   | stosd               dword ptr es:[edi], eax
            //   92                   | xchg                eax, edx
            //   6f                   | outsd               dx, dword ptr [esi]
            //   0c48                 | or                  al, 0x48
            //   b5f9                 | mov                 ch, 0xf9
            //   43                   | inc                 ebx

        $sequence_7 = { 5f e1fb 1cc9 3ca5 2c8e }
            // n = 5, score = 100
            //   5f                   | pop                 edi
            //   e1fb                 | loope               0xfffffffd
            //   1cc9                 | sbb                 al, 0xc9
            //   3ca5                 | cmp                 al, 0xa5
            //   2c8e                 | sub                 al, 0x8e

        $sequence_8 = { 670048ff 680049ff69 004aff 6a00 4b ff6b00 4c }
            // n = 7, score = 100
            //   670048ff             | add                 byte ptr [bx + si - 1], cl
            //   680049ff69           | push                0x69ff4900
            //   004aff               | add                 byte ptr [edx - 1], cl
            //   6a00                 | push                0
            //   4b                   | dec                 ebx
            //   ff6b00               | ljmp                [ebx]
            //   4c                   | dec                 esp

        $sequence_9 = { e60e 6c 7bbc 45 }
            // n = 4, score = 100
            //   e60e                 | out                 0xe, al
            //   6c                   | insb                byte ptr es:[edi], dx
            //   7bbc                 | jnp                 0xffffffbe
            //   45                   | inc                 ebp

        $sequence_10 = { ff7300 54 ff740055 ff7500 56 }
            // n = 5, score = 100
            //   ff7300               | push                dword ptr [ebx]
            //   54                   | push                esp
            //   ff740055             | push                dword ptr [eax + eax + 0x55]
            //   ff7500               | push                dword ptr [ebp]
            //   56                   | push                esi

        $sequence_11 = { 334a54 98 56 39ec 51 7fa1 6d }
            // n = 7, score = 100
            //   334a54               | xor                 ecx, dword ptr [edx + 0x54]
            //   98                   | cwde                
            //   56                   | push                esi
            //   39ec                 | cmp                 esp, ebp
            //   51                   | push                ecx
            //   7fa1                 | jg                  0xffffffa3
            //   6d                   | insd                dword ptr es:[edi], dx

        $sequence_12 = { b051 9f 4a d7 b9533e507c }
            // n = 5, score = 100
            //   b051                 | mov                 al, 0x51
            //   9f                   | lahf                
            //   4a                   | dec                 edx
            //   d7                   | xlatb               
            //   b9533e507c           | mov                 ecx, 0x7c503e53

        $sequence_13 = { b5f5 42 317f52 56 }
            // n = 4, score = 100
            //   b5f5                 | mov                 ch, 0xf5
            //   42                   | inc                 edx
            //   317f52               | xor                 dword ptr [edi + 0x52], edi
            //   56                   | push                esi

        $sequence_14 = { bfdb4a7adc de6326 9e 45 334a54 98 }
            // n = 6, score = 100
            //   bfdb4a7adc           | mov                 edi, 0xdc7a4adb
            //   de6326               | fisub               word ptr [ebx + 0x26]
            //   9e                   | sahf                
            //   45                   | inc                 ebp
            //   334a54               | xor                 ecx, dword ptr [edx + 0x54]
            //   98                   | cwde                

        $sequence_15 = { 3ca5 2c8e a1???????? d528 32f4 }
            // n = 5, score = 100
            //   3ca5                 | cmp                 al, 0xa5
            //   2c8e                 | sub                 al, 0x8e
            //   a1????????           |                     
            //   d528                 | aad                 0x28
            //   32f4                 | xor                 dh, ah

    condition:
        7 of them and filesize < 1720320
}