rule win_vanhelsing_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.vanhelsing."
        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.vanhelsing"
        malpedia_rule_date = "20260422"
        malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14"
        malpedia_version = "20260504"
        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 = { 8b458c 038508ffffff 1395c0feffff 03856cffffff 898524ffffff 139530ffffff 33850cffffff }
            // n = 7, score = 100
            //   8b458c               | mov                 eax, dword ptr [ebp - 0x74]
            //   038508ffffff         | add                 eax, dword ptr [ebp - 0xf8]
            //   1395c0feffff         | adc                 edx, dword ptr [ebp - 0x140]
            //   03856cffffff         | add                 eax, dword ptr [ebp - 0x94]
            //   898524ffffff         | mov                 dword ptr [ebp - 0xdc], eax
            //   139530ffffff         | adc                 edx, dword ptr [ebp - 0xd0]
            //   33850cffffff         | xor                 eax, dword ptr [ebp - 0xf4]

        $sequence_1 = { 898d1cffffff 03ca 89b568ffffff 13b508ffffff 33d9 33c6 898d64ffffff }
            // n = 7, score = 100
            //   898d1cffffff         | mov                 dword ptr [ebp - 0xe4], ecx
            //   03ca                 | add                 ecx, edx
            //   89b568ffffff         | mov                 dword ptr [ebp - 0x98], esi
            //   13b508ffffff         | adc                 esi, dword ptr [ebp - 0xf8]
            //   33d9                 | xor                 ebx, ecx
            //   33c6                 | xor                 eax, esi
            //   898d64ffffff         | mov                 dword ptr [ebp - 0x9c], ecx

        $sequence_2 = { 8b45ac 0f1006 0f57c8 8b4db0 0f289580feffff 0f289d70feffff 0f1108 }
            // n = 7, score = 100
            //   8b45ac               | mov                 eax, dword ptr [ebp - 0x54]
            //   0f1006               | movups              xmm0, xmmword ptr [esi]
            //   0f57c8               | xorps               xmm1, xmm0
            //   8b4db0               | mov                 ecx, dword ptr [ebp - 0x50]
            //   0f289580feffff       | movaps              xmm2, xmmword ptr [ebp - 0x180]
            //   0f289d70feffff       | movaps              xmm3, xmmword ptr [ebp - 0x190]
            //   0f1108               | movups              xmmword ptr [eax], xmm1

        $sequence_3 = { 898d08ffffff 138568ffffff 33d9 33d0 899d68ffffff c1a568ffffff10 0facd310 }
            // n = 7, score = 100
            //   898d08ffffff         | mov                 dword ptr [ebp - 0xf8], ecx
            //   138568ffffff         | adc                 eax, dword ptr [ebp - 0x98]
            //   33d9                 | xor                 ebx, ecx
            //   33d0                 | xor                 edx, eax
            //   899d68ffffff         | mov                 dword ptr [ebp - 0x98], ebx
            //   c1a568ffffff10       | shl                 dword ptr [ebp - 0x98], 0x10
            //   0facd310             | shrd                ebx, edx, 0x10

        $sequence_4 = { 898df4feffff 33c6 8b8d6cffffff 8bf0 33ca c1e610 0facc810 }
            // n = 7, score = 100
            //   898df4feffff         | mov                 dword ptr [ebp - 0x10c], ecx
            //   33c6                 | xor                 eax, esi
            //   8b8d6cffffff         | mov                 ecx, dword ptr [ebp - 0x94]
            //   8bf0                 | mov                 esi, eax
            //   33ca                 | xor                 ecx, edx
            //   c1e610               | shl                 esi, 0x10
            //   0facc810             | shrd                eax, ecx, 0x10

        $sequence_5 = { 0bf9 8b8d44ffffff 03c2 898564ffffff 13cf 89950cffffff 33c6 }
            // n = 7, score = 100
            //   0bf9                 | or                  edi, ecx
            //   8b8d44ffffff         | mov                 ecx, dword ptr [ebp - 0xbc]
            //   03c2                 | add                 eax, edx
            //   898564ffffff         | mov                 dword ptr [ebp - 0x9c], eax
            //   13cf                 | adc                 ecx, edi
            //   89950cffffff         | mov                 dword ptr [ebp - 0xf4], edx
            //   33c6                 | xor                 eax, esi

        $sequence_6 = { 8bc4 0f1045d0 83ec10 0f1100 8bc4 0f108560ffffff 0f1100 }
            // n = 7, score = 100
            //   8bc4                 | mov                 eax, esp
            //   0f1045d0             | movups              xmm0, xmmword ptr [ebp - 0x30]
            //   83ec10               | sub                 esp, 0x10
            //   0f1100               | movups              xmmword ptr [eax], xmm0
            //   8bc4                 | mov                 eax, esp
            //   0f108560ffffff       | movups              xmm0, xmmword ptr [ebp - 0xa0]
            //   0f1100               | movups              xmmword ptr [eax], xmm0

        $sequence_7 = { 3bc8 740c 8b0cb514bd4800 46 85c9 75f0 }
            // n = 6, score = 100
            //   3bc8                 | cmp                 ecx, eax
            //   740c                 | je                  0xe
            //   8b0cb514bd4800       | mov                 ecx, dword ptr [esi*4 + 0x48bd14]
            //   46                   | inc                 esi
            //   85c9                 | test                ecx, ecx
            //   75f0                 | jne                 0xfffffff2

        $sequence_8 = { 55 8bec 8b450c ff7510 ff348544bc4800 ff7508 e8???????? }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   ff7510               | push                dword ptr [ebp + 0x10]
            //   ff348544bc4800       | push                dword ptr [eax*4 + 0x48bc44]
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     

        $sequence_9 = { 83c220 03c2 83c40c 83c620 3bc7 8b459c 76db }
            // n = 7, score = 100
            //   83c220               | add                 edx, 0x20
            //   03c2                 | add                 eax, edx
            //   83c40c               | add                 esp, 0xc
            //   83c620               | add                 esi, 0x20
            //   3bc7                 | cmp                 eax, edi
            //   8b459c               | mov                 eax, dword ptr [ebp - 0x64]
            //   76db                 | jbe                 0xffffffdd

    condition:
        7 of them and filesize < 2981888
}