rule win_erebus_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.erebus."
        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.erebus"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { e8???????? eb05 e8???????? 83c404 8b8c24a8000000 64890d00000000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   eb05                 | jmp                 7
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   8b8c24a8000000       | mov                 ecx, dword ptr [esp + 0xa8]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_1 = { 66837c68fe5c 7424 83f908 8d44241c 0f43c2 66837c68fe2f }
            // n = 6, score = 100
            //   66837c68fe5c         | cmp                 word ptr [eax + ebp*2 - 2], 0x5c
            //   7424                 | je                  0x26
            //   83f908               | cmp                 ecx, 8
            //   8d44241c             | lea                 eax, [esp + 0x1c]
            //   0f43c2               | cmovae              eax, edx
            //   66837c68fe2f         | cmp                 word ptr [eax + ebp*2 - 2], 0x2f

        $sequence_2 = { 8d4c2414 e8???????? 8d4c2414 c7442454ffffffff e8???????? 8b4c244c 64890d00000000 }
            // n = 7, score = 100
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   e8????????           |                     
            //   8d4c2414             | lea                 ecx, [esp + 0x14]
            //   c7442454ffffffff     | mov                 dword ptr [esp + 0x54], 0xffffffff
            //   e8????????           |                     
            //   8b4c244c             | mov                 ecx, dword ptr [esp + 0x4c]
            //   64890d00000000       | mov                 dword ptr fs:[0], ecx

        $sequence_3 = { c744243c00000000 c7400400000000 8b442438 c70000000000 6a00 c684242401000006 8d842498000000 }
            // n = 7, score = 100
            //   c744243c00000000     | mov                 dword ptr [esp + 0x3c], 0
            //   c7400400000000       | mov                 dword ptr [eax + 4], 0
            //   8b442438             | mov                 eax, dword ptr [esp + 0x38]
            //   c70000000000         | mov                 dword ptr [eax], 0
            //   6a00                 | push                0
            //   c684242401000006     | mov                 byte ptr [esp + 0x124], 6
            //   8d842498000000       | lea                 eax, [esp + 0x98]

        $sequence_4 = { 83a54cfffffff7 8d8d50ffffff e9???????? c3 8b854cffffff 83e010 }
            // n = 6, score = 100
            //   83a54cfffffff7       | and                 dword ptr [ebp - 0xb4], 0xfffffff7
            //   8d8d50ffffff         | lea                 ecx, [ebp - 0xb0]
            //   e9????????           |                     
            //   c3                   | ret                 
            //   8b854cffffff         | mov                 eax, dword ptr [ebp - 0xb4]
            //   83e010               | and                 eax, 0x10

        $sequence_5 = { 8b07 ff5018 8bf0 0fb60e 884d00 8d4e04 51 }
            // n = 7, score = 100
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   ff5018               | call                dword ptr [eax + 0x18]
            //   8bf0                 | mov                 esi, eax
            //   0fb60e               | movzx               ecx, byte ptr [esi]
            //   884d00               | mov                 byte ptr [ebp], cl
            //   8d4e04               | lea                 ecx, [esi + 4]
            //   51                   | push                ecx

        $sequence_6 = { 83c408 8bf0 8b442418 c68424000200000e 8a0e 8848e8 8d4e04 }
            // n = 7, score = 100
            //   83c408               | add                 esp, 8
            //   8bf0                 | mov                 esi, eax
            //   8b442418             | mov                 eax, dword ptr [esp + 0x18]
            //   c68424000200000e     | mov                 byte ptr [esp + 0x200], 0xe
            //   8a0e                 | mov                 cl, byte ptr [esi]
            //   8848e8               | mov                 byte ptr [eax - 0x18], cl
            //   8d4e04               | lea                 ecx, [esi + 4]

        $sequence_7 = { 8bca c1c105 81c19979825a 8b4024 89442450 8bc5 034c2450 }
            // n = 7, score = 100
            //   8bca                 | mov                 ecx, edx
            //   c1c105               | rol                 ecx, 5
            //   81c19979825a         | add                 ecx, 0x5a827999
            //   8b4024               | mov                 eax, dword ptr [eax + 0x24]
            //   89442450             | mov                 dword ptr [esp + 0x50], eax
            //   8bc5                 | mov                 eax, ebp
            //   034c2450             | add                 ecx, dword ptr [esp + 0x50]

        $sequence_8 = { 7507 8b06 8bce ff5008 5f 5e 8be5 }
            // n = 7, score = 100
            //   7507                 | jne                 9
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   8bce                 | mov                 ecx, esi
            //   ff5008               | call                dword ptr [eax + 8]
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   8be5                 | mov                 esp, ebp

        $sequence_9 = { e8???????? 8bc8 e8???????? 8b45b8 85c0 740b 8b00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8bc8                 | mov                 ecx, eax
            //   e8????????           |                     
            //   8b45b8               | mov                 eax, dword ptr [ebp - 0x48]
            //   85c0                 | test                eax, eax
            //   740b                 | je                  0xd
            //   8b00                 | mov                 eax, dword ptr [eax]

    condition:
        7 of them and filesize < 2564096
}