rule win_cicada3301_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.cicada3301."
        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.cicada3301"
        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???????? 8b4c2428 8b44242c 83f902 7574 49be0000000002000000 4c09f0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8b4c2428             | je                  0x221
            //   8b44242c             | dec                 eax
            //   83f902               | mov                 ecx, dword ptr [ebp + 0x1e8]
            //   7574                 | cmp                 dword ptr [ebp + 0xffc], 0
            //   49be0000000002000000     | je    0x203
            //   4c09f0               | mov                 ecx, dword ptr [ebp + 0x1000]

        $sequence_1 = { f30f104008 0f14c4 f30f10600c 0f14e5 410f58e1 0f59e2 0f58e0 }
            // n = 7, score = 100
            //   f30f104008           | mulsd               xmm1, xmm0
            //   0f14c4               | subsd               xmm4, xmm2
            //   f30f10600c           | subsd               xmm4, xmm3
            //   0f14e5               | subsd               xmm1, xmm4
            //   410f58e1             | movapd              xmm3, xmm2
            //   0f59e2               | subsd               xmm3, xmm1
            //   0f58e0               | mulsd               xmm1, xmm1

        $sequence_2 = { eb1d 4889c1 48d1e9 83e001 4809c8 f3480f2ac0 f30f58c0 }
            // n = 7, score = 100
            //   eb1d                 | inc                 ebp
            //   4889c1               | xor                 edi, edi
            //   48d1e9               | dec                 esp
            //   83e001               | mov                 dword ptr [esp + 0xd8], edi
            //   4809c8               | dec                 eax
            //   f3480f2ac0           | mov                 dword ptr [esp + 0x78], ebx
            //   f30f58c0             | dec                 esp

        $sequence_3 = { e9???????? 488b542428 4889d1 4d89f8 ebc3 4c8d0507c33a00 eb07 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   488b542428           | lea                 edx, [eax + eax*2]
            //   4889d1               | jmp                 0x6c
            //   4d89f8               | dec                 eax
            //   ebc3                 | mov                 eax, dword ptr [edi]
            //   4c8d0507c33a00       | dec                 eax
            //   eb07                 | test                eax, eax

        $sequence_4 = { e8???????? a801 7526 c1e810 48897dd0 4c8975d8 668945e0 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   a801                 | dec                 eax
            //   7526                 | mov                 ecx, dword ptr [edi + 0x180]
            //   c1e810               | dec                 eax
            //   48897dd0             | imul                eax, dword ptr [edi + 0x188], 0x258
            //   4c8975d8             | test                al, al
            //   668945e0             | dec                 eax

        $sequence_5 = { e9???????? 418b8598010000 85c0 0f8485000000 41398594010000 0f828d000000 4c8b5e20 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   418b8598010000       | lea                 eax, [0x2c0002]
            //   85c0                 | dec                 eax
            //   0f8485000000         | mov                 ecx, ebp
            //   41398594010000       | dec                 eax
            //   0f828d000000         | mov                 edx, ebx
            //   4c8b5e20             | dec                 esp

        $sequence_6 = { e8???????? 4885c0 7405 4883c428 c3 b908000000 ba401b0000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   4885c0               | mov                 dword ptr [eax], 0x626d7564
            //   7405                 | dec                 esp
            //   4883c428             | cmp                 edi, edi
            //   c3                   | jne                 0x8ad
            //   b908000000           | mov                 edx, 4
            //   ba401b0000           | dec                 eax

        $sequence_7 = { e9???????? 41bb01000000 4531c9 be01000000 4531c0 4983fa05 0f830cffffff }
            // n = 7, score = 100
            //   e9????????           |                     
            //   41bb01000000         | dec                 esp
            //   4531c9               | lea                 eax, [0x29377a]
            //   be01000000           | dec                 eax
            //   4531c0               | lea                 ecx, [esp + 0xd8]
            //   4983fa05             | inc                 ecx
            //   0f830cffffff         | mov                 ecx, 0xe

        $sequence_8 = { 80beca01000000 745c 448d59bf 4180fb1a 7308 80c920 4189cb }
            // n = 7, score = 100
            //   80beca01000000       | dec                 eax
            //   745c                 | cmp                 eax, 3
            //   448d59bf             | je                  0x949
            //   4180fb1a             | or                  byte ptr [edi + ebx + 0x80], 0x40
            //   7308                 | or                  byte ptr [edi + ebx + 0x90], 0x40
            //   80c920               | inc                 ecx
            //   4189cb               | shr                 esi, 4

        $sequence_9 = { f20f59c2 58 c3 f20f5805???????? f20f100d???????? b8ffffffff 660f28d0 }
            // n = 7, score = 100
            //   f20f59c2             | test                eax, eax
            //   58                   | je                  0x253
            //   c3                   | dec                 eax
            //   f20f5805????????     |                     
            //   f20f100d????????     |                     
            //   b8ffffffff           | shl                 eax, 4
            //   660f28d0             | dec                 eax

    condition:
        7 of them and filesize < 11247616
}