rule win_cameleon_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.cameleon."
        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.cameleon"
        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 = { 8b4004 c74408e0bc4b0510 8b41e0 8b5004 }
            // n = 4, score = 100
            //   8b4004               | mov                 eax, dword ptr [eax + 4]
            //   c74408e0bc4b0510     | mov                 dword ptr [eax + ecx - 0x20], 0x10054bbc
            //   8b41e0               | mov                 eax, dword ptr [ecx - 0x20]
            //   8b5004               | mov                 edx, dword ptr [eax + 4]

        $sequence_1 = { 56 e8???????? eb65 8b4db8 83f910 0f83d4000000 83c8ff }
            // n = 7, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   eb65                 | jmp                 0x67
            //   8b4db8               | mov                 ecx, dword ptr [ebp - 0x48]
            //   83f910               | cmp                 ecx, 0x10
            //   0f83d4000000         | jae                 0xda
            //   83c8ff               | or                  eax, 0xffffffff

        $sequence_2 = { 8d41e0 3c5a 770f 0fbec1 0fb68018fb0410 83e00f eb02 }
            // n = 7, score = 100
            //   8d41e0               | lea                 eax, [ecx - 0x20]
            //   3c5a                 | cmp                 al, 0x5a
            //   770f                 | ja                  0x11
            //   0fbec1               | movsx               eax, cl
            //   0fb68018fb0410       | movzx               eax, byte ptr [eax + 0x1004fb18]
            //   83e00f               | and                 eax, 0xf
            //   eb02                 | jmp                 4

        $sequence_3 = { 8b08 8b4904 f644010c06 7539 0f1f00 8d8504ffffff 50 }
            // n = 7, score = 100
            //   8b08                 | mov                 ecx, dword ptr [eax]
            //   8b4904               | mov                 ecx, dword ptr [ecx + 4]
            //   f644010c06           | test                byte ptr [ecx + eax + 0xc], 6
            //   7539                 | jne                 0x3b
            //   0f1f00               | nop                 dword ptr [eax]
            //   8d8504ffffff         | lea                 eax, [ebp - 0xfc]
            //   50                   | push                eax

        $sequence_4 = { 57 8d1c8510d40510 33c0 f00fb10b 8b15???????? 83cfff 8bca }
            // n = 7, score = 100
            //   57                   | push                edi
            //   8d1c8510d40510       | lea                 ebx, [eax*4 + 0x1005d410]
            //   33c0                 | xor                 eax, eax
            //   f00fb10b             | lock cmpxchg        dword ptr [ebx], ecx
            //   8b15????????         |                     
            //   83cfff               | or                  edi, 0xffffffff
            //   8bca                 | mov                 ecx, edx

        $sequence_5 = { 8a90ac4c0510 e8???????? 0fbe06 83e00f 8a90ac4c0510 8d8dccfeffff }
            // n = 6, score = 100
            //   8a90ac4c0510         | mov                 dl, byte ptr [eax + 0x10054cac]
            //   e8????????           |                     
            //   0fbe06               | movsx               eax, byte ptr [esi]
            //   83e00f               | and                 eax, 0xf
            //   8a90ac4c0510         | mov                 dl, byte ptr [eax + 0x10054cac]
            //   8d8dccfeffff         | lea                 ecx, [ebp - 0x134]

        $sequence_6 = { 8bc2 8bca 83e03f c1f906 6bc030 03048d50d60510 eb05 }
            // n = 7, score = 100
            //   8bc2                 | mov                 eax, edx
            //   8bca                 | mov                 ecx, edx
            //   83e03f               | and                 eax, 0x3f
            //   c1f906               | sar                 ecx, 6
            //   6bc030               | imul                eax, eax, 0x30
            //   03048d50d60510       | add                 eax, dword ptr [ecx*4 + 0x1005d650]
            //   eb05                 | jmp                 7

        $sequence_7 = { 8365fc00 8b45e4 8b048550d60510 8b4de0 f644082801 }
            // n = 5, score = 100
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8b45e4               | mov                 eax, dword ptr [ebp - 0x1c]
            //   8b048550d60510       | mov                 eax, dword ptr [eax*4 + 0x1005d650]
            //   8b4de0               | mov                 ecx, dword ptr [ebp - 0x20]
            //   f644082801           | test                byte ptr [eax + ecx + 0x28], 1

        $sequence_8 = { 0f43559c 66833a00 7504 33c9 }
            // n = 4, score = 100
            //   0f43559c             | cmovae              edx, dword ptr [ebp - 0x64]
            //   66833a00             | cmp                 word ptr [edx], 0
            //   7504                 | jne                 6
            //   33c9                 | xor                 ecx, ecx

        $sequence_9 = { 0f8497040000 8b75a4 3b75a8 0f848b040000 660f1f840000000000 8d8db4feffff e8???????? }
            // n = 7, score = 100
            //   0f8497040000         | je                  0x49d
            //   8b75a4               | mov                 esi, dword ptr [ebp - 0x5c]
            //   3b75a8               | cmp                 esi, dword ptr [ebp - 0x58]
            //   0f848b040000         | je                  0x491
            //   660f1f840000000000     | nop    word ptr [eax + eax]
            //   8d8db4feffff         | lea                 ecx, [ebp - 0x14c]
            //   e8????????           |                     

    condition:
        7 of them and filesize < 824320
}