rule win_sienna_purple_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.sienna_purple."
        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.sienna_purple"
        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 = { e9???????? 8b8de0fdffff 8d8100280000 663b85b8fdffff 0f871d010000 83fb04 0f8214010000 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   8b8de0fdffff         | mov                 ecx, dword ptr [ebp - 0x220]
            //   8d8100280000         | lea                 eax, [ecx + 0x2800]
            //   663b85b8fdffff       | cmp                 ax, word ptr [ebp - 0x248]
            //   0f871d010000         | ja                  0x123
            //   83fb04               | cmp                 ebx, 4
            //   0f8214010000         | jb                  0x11a

        $sequence_1 = { c7459c00000000 c7458c70105000 251f000080 7905 48 83c8e0 40 }
            // n = 7, score = 100
            //   c7459c00000000       | mov                 dword ptr [ebp - 0x64], 0
            //   c7458c70105000       | mov                 dword ptr [ebp - 0x74], 0x501070
            //   251f000080           | and                 eax, 0x8000001f
            //   7905                 | jns                 7
            //   48                   | dec                 eax
            //   83c8e0               | or                  eax, 0xffffffe0
            //   40                   | inc                 eax

        $sequence_2 = { ff75e4 e8???????? 66c7460d0000 8d8dccfeffff c745fcffffffff e8???????? 8b4df4 }
            // n = 7, score = 100
            //   ff75e4               | push                dword ptr [ebp - 0x1c]
            //   e8????????           |                     
            //   66c7460d0000         | mov                 word ptr [esi + 0xd], 0
            //   8d8dccfeffff         | lea                 ecx, [ebp - 0x134]
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   e8????????           |                     
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_3 = { e8???????? 83c404 e9???????? 8b460c 85c0 0f84fc010000 807828ce }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   e9????????           |                     
            //   8b460c               | mov                 eax, dword ptr [esi + 0xc]
            //   85c0                 | test                eax, eax
            //   0f84fc010000         | je                  0x202
            //   807828ce             | cmp                 byte ptr [eax + 0x28], 0xce

        $sequence_4 = { 9b d93c24 0fb70424 83fa08 7408 8482df485300 7526 }
            // n = 7, score = 100
            //   9b                   | wait                
            //   d93c24               | fnstcw              word ptr [esp]
            //   0fb70424             | movzx               eax, word ptr [esp]
            //   83fa08               | cmp                 edx, 8
            //   7408                 | je                  0xa
            //   8482df485300         | test                byte ptr [edx + 0x5348df], al
            //   7526                 | jne                 0x28

        $sequence_5 = { ff5014 8d8d78ffffff c745fcffffffff e8???????? 83c8ff 0bd0 8b4df4 }
            // n = 7, score = 100
            //   ff5014               | call                dword ptr [eax + 0x14]
            //   8d8d78ffffff         | lea                 ecx, [ebp - 0x88]
            //   c745fcffffffff       | mov                 dword ptr [ebp - 4], 0xffffffff
            //   e8????????           |                     
            //   83c8ff               | or                  eax, 0xffffffff
            //   0bd0                 | or                  edx, eax
            //   8b4df4               | mov                 ecx, dword ptr [ebp - 0xc]

        $sequence_6 = { 83c408 84c0 7409 5f 5e 32c0 5b }
            // n = 7, score = 100
            //   83c408               | add                 esp, 8
            //   84c0                 | test                al, al
            //   7409                 | je                  0xb
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   32c0                 | xor                 al, al
            //   5b                   | pop                 ebx

        $sequence_7 = { c645fc01 85f6 7429 6850010000 6a00 56 e8???????? }
            // n = 7, score = 100
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   85f6                 | test                esi, esi
            //   7429                 | je                  0x2b
            //   6850010000           | push                0x150
            //   6a00                 | push                0
            //   56                   | push                esi
            //   e8????????           |                     

        $sequence_8 = { e8???????? 8d8d48ffffff e8???????? 8d8dd4feffff e8???????? 68???????? 57 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d8d48ffffff         | lea                 ecx, [ebp - 0xb8]
            //   e8????????           |                     
            //   8d8dd4feffff         | lea                 ecx, [ebp - 0x12c]
            //   e8????????           |                     
            //   68????????           |                     
            //   57                   | push                edi

        $sequence_9 = { 8a4d0b 888c187c0e0000 83bb7c1e000000 0f8573000000 baff0f0000 8db3b81e0000 bf0f000000 }
            // n = 7, score = 100
            //   8a4d0b               | mov                 cl, byte ptr [ebp + 0xb]
            //   888c187c0e0000       | mov                 byte ptr [eax + ebx + 0xe7c], cl
            //   83bb7c1e000000       | cmp                 dword ptr [ebx + 0x1e7c], 0
            //   0f8573000000         | jne                 0x79
            //   baff0f0000           | mov                 edx, 0xfff
            //   8db3b81e0000         | lea                 esi, [ebx + 0x1eb8]
            //   bf0f000000           | mov                 edi, 0xf

    condition:
        7 of them and filesize < 2930688
}