rule win_helminth_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-01-25"
        version = "1"
        description = "Detects win.helminth."
        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.helminth"
        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 = { a1???????? 68e8030000 8907 e8???????? }
            // n = 4, score = 300
            //   a1????????           |                     
            //   68e8030000           | push                0x3e8
            //   8907                 | mov                 dword ptr [edi], eax
            //   e8????????           |                     

        $sequence_1 = { 8b7d08 8bc7 c1f805 8bf7 83e61f c1e606 03348570750110 }
            // n = 7, score = 200
            //   8b7d08               | mov                 edi, dword ptr [ebp + 8]
            //   8bc7                 | mov                 eax, edi
            //   c1f805               | sar                 eax, 5
            //   8bf7                 | mov                 esi, edi
            //   83e61f               | and                 esi, 0x1f
            //   c1e606               | shl                 esi, 6
            //   03348570750110       | add                 esi, dword ptr [eax*4 + 0x10017570]

        $sequence_2 = { 75f0 8bcf e8???????? e9???????? ffb5f4fdffff 8b35???????? 6a00 }
            // n = 7, score = 200
            //   75f0                 | jne                 0xfffffff2
            //   8bcf                 | mov                 ecx, edi
            //   e8????????           |                     
            //   e9????????           |                     
            //   ffb5f4fdffff         | push                dword ptr [ebp - 0x20c]
            //   8b35????????         |                     
            //   6a00                 | push                0

        $sequence_3 = { 83c410 85f6 7409 0f57c0 f30f7f06 }
            // n = 5, score = 200
            //   83c410               | add                 esp, 0x10
            //   85f6                 | test                esi, esi
            //   7409                 | je                  0xb
            //   0f57c0               | xorps               xmm0, xmm0
            //   f30f7f06             | movdqu              xmmword ptr [esi], xmm0

        $sequence_4 = { 03ff 8b048570750110 894c1830 8b45f0 8b5de8 3b450c }
            // n = 6, score = 200
            //   03ff                 | add                 edi, edi
            //   8b048570750110       | mov                 eax, dword ptr [eax*4 + 0x10017570]
            //   894c1830             | mov                 dword ptr [eax + ebx + 0x30], ecx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   8b5de8               | mov                 ebx, dword ptr [ebp - 0x18]
            //   3b450c               | cmp                 eax, dword ptr [ebp + 0xc]

        $sequence_5 = { 59 85c0 7810 3de4000000 7309 8b04c598250110 5d }
            // n = 7, score = 200
            //   59                   | pop                 ecx
            //   85c0                 | test                eax, eax
            //   7810                 | js                  0x12
            //   3de4000000           | cmp                 eax, 0xe4
            //   7309                 | jae                 0xb
            //   8b04c598250110       | mov                 eax, dword ptr [eax*8 + 0x10012598]
            //   5d                   | pop                 ebp

        $sequence_6 = { 83e31f c1e306 894df4 895ddc 8b148d70750110 8a441a04 a801 }
            // n = 7, score = 200
            //   83e31f               | and                 ebx, 0x1f
            //   c1e306               | shl                 ebx, 6
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx
            //   895ddc               | mov                 dword ptr [ebp - 0x24], ebx
            //   8b148d70750110       | mov                 edx, dword ptr [ecx*4 + 0x10017570]
            //   8a441a04             | mov                 al, byte ptr [edx + ebx + 4]
            //   a801                 | test                al, 1

        $sequence_7 = { c20400 8b3d???????? 6a00 6a00 56 8d44244c 50 }
            // n = 7, score = 200
            //   c20400               | ret                 4
            //   8b3d????????         |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   56                   | push                esi
            //   8d44244c             | lea                 eax, [esp + 0x4c]
            //   50                   | push                eax

        $sequence_8 = { d1f9 8d85d8fbffff 51 50 ffb5d4fbffff }
            // n = 5, score = 100
            //   d1f9                 | sar                 ecx, 1
            //   8d85d8fbffff         | lea                 eax, [ebp - 0x428]
            //   51                   | push                ecx
            //   50                   | push                eax
            //   ffb5d4fbffff         | push                dword ptr [ebp - 0x42c]

        $sequence_9 = { 56 33c0 50 6a01 ff75f4 ff75f0 }
            // n = 6, score = 100
            //   56                   | push                esi
            //   33c0                 | xor                 eax, eax
            //   50                   | push                eax
            //   6a01                 | push                1
            //   ff75f4               | push                dword ptr [ebp - 0xc]
            //   ff75f0               | push                dword ptr [ebp - 0x10]

        $sequence_10 = { 85c0 0f8495000000 33db 53 53 53 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f8495000000         | je                  0x9b
            //   33db                 | xor                 ebx, ebx
            //   53                   | push                ebx
            //   53                   | push                ebx
            //   53                   | push                ebx

        $sequence_11 = { 75f2 8b4df0 e8???????? be???????? 8945e0 8bfe }
            // n = 6, score = 100
            //   75f2                 | jne                 0xfffffff4
            //   8b4df0               | mov                 ecx, dword ptr [ebp - 0x10]
            //   e8????????           |                     
            //   be????????           |                     
            //   8945e0               | mov                 dword ptr [ebp - 0x20], eax
            //   8bfe                 | mov                 edi, esi

        $sequence_12 = { ff75bc ff15???????? 57 e8???????? 59 8bce }
            // n = 6, score = 100
            //   ff75bc               | push                dword ptr [ebp - 0x44]
            //   ff15????????         |                     
            //   57                   | push                edi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8bce                 | mov                 ecx, esi

        $sequence_13 = { ffd7 56 ff15???????? 8bb5ccfdffff 8d85d0fdffff 50 }
            // n = 6, score = 100
            //   ffd7                 | call                edi
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8bb5ccfdffff         | mov                 esi, dword ptr [ebp - 0x234]
            //   8d85d0fdffff         | lea                 eax, [ebp - 0x230]
            //   50                   | push                eax

        $sequence_14 = { 8d4601 f7e3 0f90c1 f7d9 0bc8 51 }
            // n = 6, score = 100
            //   8d4601               | lea                 eax, [esi + 1]
            //   f7e3                 | mul                 ebx
            //   0f90c1               | seto                cl
            //   f7d9                 | neg                 ecx
            //   0bc8                 | or                  ecx, eax
            //   51                   | push                ecx

    condition:
        7 of them and filesize < 479232
}