rule win_mebromi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-07-11"
        version = "1"
        description = "Detects win.mebromi."
        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.mebromi"
        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 = { c20c00 ff05???????? 833d????????01 55 56 }
            // n = 5, score = 100
            //   c20c00               | ret                 0xc
            //   ff05????????         |                     
            //   833d????????01       |                     
            //   55                   | push                ebp
            //   56                   | push                esi

        $sequence_1 = { ff15???????? 8bf0 85f6 741c 8d45e4 57 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   741c                 | je                  0x1e
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   57                   | push                edi

        $sequence_2 = { f3ab c1e604 aa 8d9e88722900 }
            // n = 4, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   c1e604               | shl                 esi, 4
            //   aa                   | stosb               byte ptr es:[edi], al
            //   8d9e88722900         | lea                 ebx, [esi + 0x297288]

        $sequence_3 = { 8d05549d2900 83780800 753b b0ff 8bff 0ac0 }
            // n = 6, score = 100
            //   8d05549d2900         | lea                 eax, [0x299d54]
            //   83780800             | cmp                 dword ptr [eax + 8], 0
            //   753b                 | jne                 0x3d
            //   b0ff                 | mov                 al, 0xff
            //   8bff                 | mov                 edi, edi
            //   0ac0                 | or                  al, al

        $sequence_4 = { 5c 2b29 00802b290023 d18a0688078a }
            // n = 4, score = 100
            //   5c                   | pop                 esp
            //   2b29                 | sub                 ebp, dword ptr [ecx]
            //   00802b290023         | add                 byte ptr [eax + 0x2300292b], al
            //   d18a0688078a         | ror                 dword ptr [edx - 0x75f877fa], 1

        $sequence_5 = { 0fb6d2 3bc2 0f8794000000 808801a0290004 40 ebee }
            // n = 6, score = 100
            //   0fb6d2               | movzx               edx, dl
            //   3bc2                 | cmp                 eax, edx
            //   0f8794000000         | ja                  0x9a
            //   808801a0290004       | or                  byte ptr [eax + 0x29a001], 4
            //   40                   | inc                 eax
            //   ebee                 | jmp                 0xfffffff0

        $sequence_6 = { 683f000f00 6a00 6a00 ff15???????? 8bf0 56 }
            // n = 6, score = 100
            //   683f000f00           | push                0xf003f
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   56                   | push                esi

        $sequence_7 = { 85f6 7419 0fb6da f68301a0290004 7406 8816 }
            // n = 6, score = 100
            //   85f6                 | test                esi, esi
            //   7419                 | je                  0x1b
            //   0fb6da               | movzx               ebx, dl
            //   f68301a0290004       | test                byte ptr [ebx + 0x29a001], 4
            //   7406                 | je                  8
            //   8816                 | mov                 byte ptr [esi], dl

        $sequence_8 = { 83f908 7229 f3a5 ff2495082c2900 8bc7 ba03000000 }
            // n = 6, score = 100
            //   83f908               | cmp                 ecx, 8
            //   7229                 | jb                  0x2b
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   ff2495082c2900       | jmp                 dword ptr [edx*4 + 0x292c08]
            //   8bc7                 | mov                 eax, edi
            //   ba03000000           | mov                 edx, 3

        $sequence_9 = { 8bd8 56 ffd7 3bdd 5b 7504 }
            // n = 6, score = 100
            //   8bd8                 | mov                 ebx, eax
            //   56                   | push                esi
            //   ffd7                 | call                edi
            //   3bdd                 | cmp                 ebx, ebp
            //   5b                   | pop                 ebx
            //   7504                 | jne                 6

    condition:
        7 of them and filesize < 106496
}