rule win_redcurl_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.redcurl."
        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.redcurl"
        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 = { ff15???????? 8bd0 c7461000000000 8bca c746140f000000 c60600 8d7901 }
            // n = 7, score = 400
            //   ff15????????         |                     
            //   8bd0                 | mov                 edx, eax
            //   c7461000000000       | mov                 dword ptr [esi + 0x10], 0
            //   8bca                 | mov                 ecx, edx
            //   c746140f000000       | mov                 dword ptr [esi + 0x14], 0xf
            //   c60600               | mov                 byte ptr [esi], 0
            //   8d7901               | lea                 edi, [ecx + 1]

        $sequence_1 = { 2bc6 48 50 56 }
            // n = 4, score = 400
            //   2bc6                 | sub                 eax, esi
            //   48                   | dec                 eax
            //   50                   | push                eax
            //   56                   | push                esi

        $sequence_2 = { f7f9 80c261 88143e 47 }
            // n = 4, score = 400
            //   f7f9                 | idiv                ecx
            //   80c261               | add                 dl, 0x61
            //   88143e               | mov                 byte ptr [esi + edi], dl
            //   47                   | inc                 edi

        $sequence_3 = { 6a00 6a00 6aff 8bf8 6a00 57 ff15???????? }
            // n = 7, score = 300
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6aff                 | push                -1
            //   8bf8                 | mov                 edi, eax
            //   6a00                 | push                0
            //   57                   | push                edi
            //   ff15????????         |                     

        $sequence_4 = { c745f001000000 e8???????? c745e800000000 c745ec0f000000 }
            // n = 4, score = 300
            //   c745f001000000       | mov                 dword ptr [ebp - 0x10], 1
            //   e8????????           |                     
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   c745ec0f000000       | mov                 dword ptr [ebp - 0x14], 0xf

        $sequence_5 = { c645d800 8d5001 8b4610 3bc2 }
            // n = 4, score = 300
            //   c645d800             | mov                 byte ptr [ebp - 0x28], 0
            //   8d5001               | lea                 edx, [eax + 1]
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   3bc2                 | cmp                 eax, edx

        $sequence_6 = { 8b4610 3bc2 726f 2bc2 83c9ff 83f8ff 0f42c8 }
            // n = 7, score = 300
            //   8b4610               | mov                 eax, dword ptr [esi + 0x10]
            //   3bc2                 | cmp                 eax, edx
            //   726f                 | jb                  0x71
            //   2bc2                 | sub                 eax, edx
            //   83c9ff               | or                  ecx, 0xffffffff
            //   83f8ff               | cmp                 eax, -1
            //   0f42c8               | cmovb               ecx, eax

        $sequence_7 = { e8???????? 8d45d8 8bce 50 e8???????? 8b55ec 83fa10 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   8bce                 | mov                 ecx, esi
            //   50                   | push                eax
            //   e8????????           |                     
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   83fa10               | cmp                 edx, 0x10

        $sequence_8 = { 0f57c0 c745e800000000 68???????? ba???????? 660fd645e0 e8???????? }
            // n = 6, score = 300
            //   0f57c0               | xorps               xmm0, xmm0
            //   c745e800000000       | mov                 dword ptr [ebp - 0x18], 0
            //   68????????           |                     
            //   ba????????           |                     
            //   660fd645e0           | movq                qword ptr [ebp - 0x20], xmm0
            //   e8????????           |                     

        $sequence_9 = { 837d1c10 8d4d08 6a00 0f434d08 8bf0 6a00 }
            // n = 6, score = 300
            //   837d1c10             | cmp                 dword ptr [ebp + 0x1c], 0x10
            //   8d4d08               | lea                 ecx, [ebp + 8]
            //   6a00                 | push                0
            //   0f434d08             | cmovae              ecx, dword ptr [ebp + 8]
            //   8bf0                 | mov                 esi, eax
            //   6a00                 | push                0

        $sequence_10 = { 750f d93c24 668b0424 6683e07f 6683f87f 8d642408 0f85e90b0000 }
            // n = 7, score = 300
            //   750f                 | jne                 0x11
            //   d93c24               | fnstcw              word ptr [esp]
            //   668b0424             | mov                 ax, word ptr [esp]
            //   6683e07f             | and                 ax, 0x7f
            //   6683f87f             | cmp                 ax, 0x7f
            //   8d642408             | lea                 esp, [esp + 8]
            //   0f85e90b0000         | jne                 0xbef

        $sequence_11 = { c20000 55 8bec 83ec0c 8d4df4 e8???????? }
            // n = 6, score = 300
            //   c20000               | ret                 0
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec0c               | sub                 esp, 0xc
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   e8????????           |                     

        $sequence_12 = { 6a00 50 53 ff15???????? 6a00 }
            // n = 5, score = 300
            //   6a00                 | push                0
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_13 = { 83c10f 83e1f0 85d2 0f8546ffffff }
            // n = 4, score = 200
            //   83c10f               | add                 ecx, 0xf
            //   83e1f0               | and                 ecx, 0xfffffff0
            //   85d2                 | test                edx, edx
            //   0f8546ffffff         | jne                 0xffffff4c

        $sequence_14 = { 3c30 0f84b6100000 3c31 0f85aed3ffff }
            // n = 4, score = 200
            //   3c30                 | cmp                 al, 0x30
            //   0f84b6100000         | je                  0x10bc
            //   3c31                 | cmp                 al, 0x31
            //   0f85aed3ffff         | jne                 0xffffd3b4

        $sequence_15 = { e8???????? 8b8520fdffff 8d9d28fdffff 39d8 7408 890424 }
            // n = 6, score = 200
            //   e8????????           |                     
            //   8b8520fdffff         | mov                 eax, dword ptr [ebp - 0x2e0]
            //   8d9d28fdffff         | lea                 ebx, [ebp - 0x2d8]
            //   39d8                 | cmp                 eax, ebx
            //   7408                 | je                  0xa
            //   890424               | mov                 dword ptr [esp], eax

        $sequence_16 = { 85f6 741a 0fb613 8810 f7c602000000 740d }
            // n = 6, score = 200
            //   85f6                 | test                esi, esi
            //   741a                 | je                  0x1c
            //   0fb613               | movzx               edx, byte ptr [ebx]
            //   8810                 | mov                 byte ptr [eax], dl
            //   f7c602000000         | test                esi, 2
            //   740d                 | je                  0xf

        $sequence_17 = { e8???????? 89c7 8945d0 83f80f 0f8755060000 }
            // n = 5, score = 200
            //   e8????????           |                     
            //   89c7                 | mov                 edi, eax
            //   8945d0               | mov                 dword ptr [ebp - 0x30], eax
            //   83f80f               | cmp                 eax, 0xf
            //   0f8755060000         | ja                  0x65b

        $sequence_18 = { 01d8 7408 85f6 0f8471170000 899d7cfdffff 83fb0f }
            // n = 6, score = 200
            //   01d8                 | add                 eax, ebx
            //   7408                 | je                  0xa
            //   85f6                 | test                esi, esi
            //   0f8471170000         | je                  0x1777
            //   899d7cfdffff         | mov                 dword ptr [ebp - 0x284], ebx
            //   83fb0f               | cmp                 ebx, 0xf

        $sequence_19 = { 89c6 8b03 8d7e0c 85c0 }
            // n = 4, score = 200
            //   89c6                 | mov                 esi, eax
            //   8b03                 | mov                 eax, dword ptr [ebx]
            //   8d7e0c               | lea                 edi, [esi + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_20 = { 8985e8fdffff 8d8568feffff 83ec08 898560feffff }
            // n = 4, score = 200
            //   8985e8fdffff         | mov                 dword ptr [ebp - 0x218], eax
            //   8d8568feffff         | lea                 eax, [ebp - 0x198]
            //   83ec08               | sub                 esp, 8
            //   898560feffff         | mov                 dword ptr [ebp - 0x1a0], eax

    condition:
        7 of them and filesize < 487424
}