rule win_tetra_loader_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.tetra_loader."
        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.tetra_loader"
        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 = { 4c89642458 4931cf 4c897c2460 4c31cd 49c1c120 4931e9 488d7c2430 }
            // n = 7, score = 100
            //   4c89642458           | dec                 ecx
            //   4931cf               | xor                 edx, ebx
            //   4c897c2460           | dec                 esp
            //   4c31cd               | mov                 dword ptr [esp + 0x48], edx
            //   49c1c120             | dec                 esp
            //   4931e9               | xor                 edi, ecx
            //   488d7c2430           | dec                 ecx

        $sequence_1 = { eb13 4883cd05 eb0d 4983cb06 eb04 4983cb07 4c89dd }
            // n = 7, score = 100
            //   eb13                 | cmp                 edx, 3
            //   4883cd05             | dec                 ecx
            //   eb0d                 | add                 ecx, eax
            //   4983cb06             | dec                 ebp
            //   eb04                 | cmp                 esp, ecx
            //   4983cb07             | ja                  0xa44
            //   4c89dd               | dec                 ebp

        $sequence_2 = { b8ff000000 e9???????? 488d154b370000 488d0d2c370000 e8???????? c705????????02000000 eb08 }
            // n = 7, score = 100
            //   b8ff000000           | jmp                 0xed8
            //   e9????????           |                     
            //   488d154b370000       | xor                 edi, edi
            //   488d0d2c370000       | dec                 eax
            //   e8????????           |                     
            //   c705????????02000000     |     
            //   eb08                 | add                 ebp, 2

        $sequence_3 = { 4883ec48 488daa80000000 660f7f742430 488b9580000000 4885d2 740f 488b4d78 }
            // n = 7, score = 100
            //   4883ec48             | ja                  0xfffff69d
            //   488daa80000000       | shl                 edx, 4
            //   660f7f742430         | inc                 esp
            //   488b9580000000       | or                  edx, edx
            //   4885d2               | inc                 ebp
            //   740f                 | lea                 edx, [ebx - 0x30]
            //   488b4d78             | inc                 ecx

        $sequence_4 = { 57 53 4883ec48 488daa80000000 488b4d68 488b4570 4883780800 }
            // n = 7, score = 100
            //   57                   | mov                 eax, edi
            //   53                   | inc                 ecx
            //   4883ec48             | call                dword ptr [esp + 0x18]
            //   488daa80000000       | dec                 esp
            //   488b4d68             | mov                 ebp, dword ptr [eax + 0x30]
            //   488b4570             | dec                 esp
            //   4883780800           | lea                 edi, [edx + edx]

        $sequence_5 = { 66440f38dedb 66440f38dede 66440f38deda 66440f38ded9 66440f38dfd8 f30f6f00 }
            // n = 6, score = 100
            //   66440f38dedb         | inc                 sp
            //   66440f38dede         | inc                 sp
            //   66440f38deda         | inc                 sp
            //   66440f38ded9         | inc                 sp
            //   66440f38dfd8         | inc                 sp
            //   f30f6f00             | inc                 sp

        $sequence_6 = { 80f9f0 722d 0fb64e03 4883c604 83e007 c1e012 }
            // n = 6, score = 100
            //   80f9f0               | jg                  0xb1
            //   722d                 | jne                 0x261
            //   0fb64e03             | dec                 ecx
            //   4883c604             | add                 esp, ebx
            //   83e007               | dec                 eax
            //   c1e012               | mov                 ecx, edi

        $sequence_7 = { 0f8524010000 4189f0 4d39c4 0f854dffffff ff15???????? 83f87a 0f8533010000 }
            // n = 7, score = 100
            //   0f8524010000         | je                  0x125
            //   4189f0               | dec                 eax
            //   4d39c4               | mov                 edx, dword ptr [ebp + 8]
            //   0f854dffffff         | dec                 eax
            //   ff15????????         |                     
            //   83f87a               | test                edx, edx
            //   0f8533010000         | je                  0x13a

        $sequence_8 = { 0f83b0010000 48ffcb 49ffc6 e9???????? 4531c9 4484cd 0f859a030000 }
            // n = 7, score = 100
            //   0f83b0010000         | movaps              xmmword ptr [ebp + 0x10], xmm0
            //   48ffcb               | movaps              xmmword ptr [ebp - 0x60], xmm0
            //   49ffc6               | movups              xmm0, xmmword ptr [ebx + 0x10]
            //   e9????????           |                     
            //   4531c9               | movaps              xmmword ptr [ebp - 0x50], xmm0
            //   4484cd               | dec                 eax
            //   0f859a030000         | lea                 ecx, [ebp - 0x20]

        $sequence_9 = { 49b800000f0f00000f0f 4c21c0 4889c1 48c1e104 4809c1 4c31c9 48898c2490020000 }
            // n = 7, score = 100
            //   49b800000f0f00000f0f     | dec    eax
            //   4c21c0               | mov                 dword ptr [ebp + 0x4b8], eax
            //   4889c1               | dec                 eax
            //   48c1e104             | lea                 eax, [ebp + 0x558]
            //   4809c1               | dec                 eax
            //   4c31c9               | lea                 eax, [ebp + 0x5bd]
            //   48898c2490020000     | dec                 eax

    condition:
        7 of them and filesize < 847872
}