rule win_bitter_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2022-04-08"
        version = "1"
        description = "Detects win.bitter_rat."
        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.bitter_rat"
        malpedia_rule_date = "20220405"
        malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a"
        malpedia_version = "20220411"
        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 = { 68???????? e8???????? 83c40c 6a2d 68???????? }
            // n = 5, score = 200
            //   68????????           |                     
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   6a2d                 | push                0x2d
            //   68????????           |                     

        $sequence_1 = { 52 0fb7851efaffff 50 0fb78d22faffff }
            // n = 4, score = 200
            //   52                   | push                edx
            //   0fb7851efaffff       | movzx               eax, word ptr [ebp - 0x5e2]
            //   50                   | push                eax
            //   0fb78d22faffff       | movzx               ecx, word ptr [ebp - 0x5de]

        $sequence_2 = { e8???????? 83c40c 8b45f8 83c002 8945f8 6a02 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   83c002               | add                 eax, 2
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   6a02                 | push                2

        $sequence_3 = { 6bc918 8bf4 8b55f4 0fb7440a14 50 }
            // n = 5, score = 200
            //   6bc918               | imul                ecx, ecx, 0x18
            //   8bf4                 | mov                 esi, esp
            //   8b55f4               | mov                 edx, dword ptr [ebp - 0xc]
            //   0fb7440a14           | movzx               eax, word ptr [edx + ecx + 0x14]
            //   50                   | push                eax

        $sequence_4 = { 8b4508 33c9 3b04cd00344500 7413 }
            // n = 4, score = 200
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   33c9                 | xor                 ecx, ecx
            //   3b04cd00344500       | cmp                 eax, dword ptr [ecx*8 + 0x453400]
            //   7413                 | je                  0x15

        $sequence_5 = { f7fb 85d2 740d 8bc6 c1e002 8bb070474500 eb0b }
            // n = 7, score = 200
            //   f7fb                 | idiv                ebx
            //   85d2                 | test                edx, edx
            //   740d                 | je                  0xf
            //   8bc6                 | mov                 eax, esi
            //   c1e002               | shl                 eax, 2
            //   8bb070474500         | mov                 esi, dword ptr [eax + 0x454770]
            //   eb0b                 | jmp                 0xd

        $sequence_6 = { ff3485840e4500 8d4de8 e8???????? a1???????? }
            // n = 4, score = 200
            //   ff3485840e4500       | push                dword ptr [eax*4 + 0x450e84]
            //   8d4de8               | lea                 ecx, dword ptr [ebp - 0x18]
            //   e8????????           |                     
            //   a1????????           |                     

        $sequence_7 = { c705????????00000000 c705????????00000000 c705????????a10f0000 8b45f4 898578c4ffff 8b8d78c4ffff 51 }
            // n = 7, score = 200
            //   c705????????00000000     |     
            //   c705????????00000000     |     
            //   c705????????a10f0000     |     
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   898578c4ffff         | mov                 dword ptr [ebp - 0x3b88], eax
            //   8b8d78c4ffff         | mov                 ecx, dword ptr [ebp - 0x3b88]
            //   51                   | push                ecx

        $sequence_8 = { e8???????? 8945f4 eb14 8bf4 6810270000 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   8945f4               | mov                 dword ptr [ebp - 0xc], eax
            //   eb14                 | jmp                 0x16
            //   8bf4                 | mov                 esi, esp
            //   6810270000           | push                0x2710

        $sequence_9 = { 8b45a0 50 ff15???????? 3bf4 e8???????? 894594 }
            // n = 6, score = 200
            //   8b45a0               | mov                 eax, dword ptr [ebp - 0x60]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   3bf4                 | cmp                 esi, esp
            //   e8????????           |                     
            //   894594               | mov                 dword ptr [ebp - 0x6c], eax

    condition:
        7 of them and filesize < 1130496
}