rule win_threebyte_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.threebyte."
        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.threebyte"
        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 = { 83c201 8995f8feffff 8b85f4feffff 83c001 8985f4feffff eb8f 8d8dfcfeffff }
            // n = 7, score = 200
            //   83c201               | add                 edx, 1
            //   8995f8feffff         | mov                 dword ptr [ebp - 0x108], edx
            //   8b85f4feffff         | mov                 eax, dword ptr [ebp - 0x10c]
            //   83c001               | add                 eax, 1
            //   8985f4feffff         | mov                 dword ptr [ebp - 0x10c], eax
            //   eb8f                 | jmp                 0xffffff91
            //   8d8dfcfeffff         | lea                 ecx, [ebp - 0x104]

        $sequence_1 = { 8bec 81ec70060000 57 c685f0feffff00 b93f000000 33c0 8dbdf1feffff }
            // n = 7, score = 200
            //   8bec                 | mov                 ebp, esp
            //   81ec70060000         | sub                 esp, 0x670
            //   57                   | push                edi
            //   c685f0feffff00       | mov                 byte ptr [ebp - 0x110], 0
            //   b93f000000           | mov                 ecx, 0x3f
            //   33c0                 | xor                 eax, eax
            //   8dbdf1feffff         | lea                 edi, [ebp - 0x10f]

        $sequence_2 = { c6854dffffff52 c6854effffff45 c6854fffffff41 c68550ffffff54 c68551ffffff45 c68552ffffff53 c68553ffffff20 }
            // n = 7, score = 200
            //   c6854dffffff52       | mov                 byte ptr [ebp - 0xb3], 0x52
            //   c6854effffff45       | mov                 byte ptr [ebp - 0xb2], 0x45
            //   c6854fffffff41       | mov                 byte ptr [ebp - 0xb1], 0x41
            //   c68550ffffff54       | mov                 byte ptr [ebp - 0xb0], 0x54
            //   c68551ffffff45       | mov                 byte ptr [ebp - 0xaf], 0x45
            //   c68552ffffff53       | mov                 byte ptr [ebp - 0xae], 0x53
            //   c68553ffffff20       | mov                 byte ptr [ebp - 0xad], 0x20

        $sequence_3 = { 8985acfaffff 83bdacfaffffff 7516 68???????? 8d95e8fdffff }
            // n = 5, score = 200
            //   8985acfaffff         | mov                 dword ptr [ebp - 0x554], eax
            //   83bdacfaffffff       | cmp                 dword ptr [ebp - 0x554], -1
            //   7516                 | jne                 0x18
            //   68????????           |                     
            //   8d95e8fdffff         | lea                 edx, [ebp - 0x218]

        $sequence_4 = { ff520c 8b8574f7ffff 50 ff15???????? 8b4d14 51 ff15???????? }
            // n = 7, score = 200
            //   ff520c               | call                dword ptr [edx + 0xc]
            //   8b8574f7ffff         | mov                 eax, dword ptr [ebp - 0x88c]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b4d14               | mov                 ecx, dword ptr [ebp + 0x14]
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_5 = { ff500c 8b4df0 51 e8???????? 83c404 83c8ff e9???????? }
            // n = 7, score = 200
            //   ff500c               | call                dword ptr [eax + 0xc]
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     

        $sequence_6 = { e9???????? 8d85ccf8ffff 50 ff15???????? 8b8d20f8ffff 51 ff15???????? }
            // n = 7, score = 200
            //   e9????????           |                     
            //   8d85ccf8ffff         | lea                 eax, [ebp - 0x734]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8b8d20f8ffff         | mov                 ecx, dword ptr [ebp - 0x7e0]
            //   51                   | push                ecx
            //   ff15????????         |                     

        $sequence_7 = { 83c40c 8d4d9c 51 e8???????? 83c404 5f }
            // n = 6, score = 200
            //   83c40c               | add                 esp, 0xc
            //   8d4d9c               | lea                 ecx, [ebp - 0x64]
            //   51                   | push                ecx
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   5f                   | pop                 edi

        $sequence_8 = { 8b9564f2ffff 81c29c000000 52 e8???????? 83c408 }
            // n = 5, score = 200
            //   8b9564f2ffff         | mov                 edx, dword ptr [ebp - 0xd9c]
            //   81c29c000000         | add                 edx, 0x9c
            //   52                   | push                edx
            //   e8????????           |                     
            //   83c408               | add                 esp, 8

        $sequence_9 = { ff15???????? 8985ecfdffff 83bdecfdffff00 7d08 83c8ff e9???????? 8b4d0c }
            // n = 7, score = 200
            //   ff15????????         |                     
            //   8985ecfdffff         | mov                 dword ptr [ebp - 0x214], eax
            //   83bdecfdffff00       | cmp                 dword ptr [ebp - 0x214], 0
            //   7d08                 | jge                 0xa
            //   83c8ff               | or                  eax, 0xffffffff
            //   e9????????           |                     
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]

    condition:
        7 of them and filesize < 180224
}