rule win_kamasers_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.kamasers."
        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.kamasers"
        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 = { 83f81f 7732 e9???????? 6a00 6a00 6a00 6a00 }
            // n = 7, score = 100
            //   83f81f               | cmp                 eax, 0x1f
            //   7732                 | ja                  0x34
            //   e9????????           |                     
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0
            //   6a00                 | push                0

        $sequence_1 = { e8???????? 6a05 e8???????? 6a06 c705????????feffff7f e8???????? 6a00 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   6a05                 | push                5
            //   e8????????           |                     
            //   6a06                 | push                6
            //   c705????????feffff7f     |     
            //   e8????????           |                     
            //   6a00                 | push                0

        $sequence_2 = { 8b4da4 8d45d4 8b55a0 c745fc01000000 837de80f 0f4745d4 8b12 }
            // n = 7, score = 100
            //   8b4da4               | mov                 ecx, dword ptr [ebp - 0x5c]
            //   8d45d4               | lea                 eax, [ebp - 0x2c]
            //   8b55a0               | mov                 edx, dword ptr [ebp - 0x60]
            //   c745fc01000000       | mov                 dword ptr [ebp - 4], 1
            //   837de80f             | cmp                 dword ptr [ebp - 0x18], 0xf
            //   0f4745d4             | cmova               eax, dword ptr [ebp - 0x2c]
            //   8b12                 | mov                 edx, dword ptr [edx]

        $sequence_3 = { 8d4594 0f474594 6a00 6800800000 50 6a00 8d45ac }
            // n = 7, score = 100
            //   8d4594               | lea                 eax, [ebp - 0x6c]
            //   0f474594             | cmova               eax, dword ptr [ebp - 0x6c]
            //   6a00                 | push                0
            //   6800800000           | push                0x8000
            //   50                   | push                eax
            //   6a00                 | push                0
            //   8d45ac               | lea                 eax, [ebp - 0x54]

        $sequence_4 = { ba02000000 85c0 8b45c8 0f44f2 }
            // n = 4, score = 100
            //   ba02000000           | mov                 edx, 2
            //   85c0                 | test                eax, eax
            //   8b45c8               | mov                 eax, dword ptr [ebp - 0x38]
            //   0f44f2               | cmove               esi, edx

        $sequence_5 = { 668901 884102 0fb602 343f 8801 0fb64201 343f }
            // n = 7, score = 100
            //   668901               | mov                 word ptr [ecx], ax
            //   884102               | mov                 byte ptr [ecx + 2], al
            //   0fb602               | movzx               eax, byte ptr [edx]
            //   343f                 | xor                 al, 0x3f
            //   8801                 | mov                 byte ptr [ecx], al
            //   0fb64201             | movzx               eax, byte ptr [edx + 1]
            //   343f                 | xor                 al, 0x3f

        $sequence_6 = { c745fc0e000000 81c900080000 898d70feffff 6810270000 6a01 8d458c c645fc10 }
            // n = 7, score = 100
            //   c745fc0e000000       | mov                 dword ptr [ebp - 4], 0xe
            //   81c900080000         | or                  ecx, 0x800
            //   898d70feffff         | mov                 dword ptr [ebp - 0x190], ecx
            //   6810270000           | push                0x2710
            //   6a01                 | push                1
            //   8d458c               | lea                 eax, [ebp - 0x74]
            //   c645fc10             | mov                 byte ptr [ebp - 4], 0x10

        $sequence_7 = { e8???????? 8d8d04d9ffff c645fc02 83bdf4ecffff07 8d85e0ecffff 51 0f4785e0ecffff }
            // n = 7, score = 100
            //   e8????????           |                     
            //   8d8d04d9ffff         | lea                 ecx, [ebp - 0x26fc]
            //   c645fc02             | mov                 byte ptr [ebp - 4], 2
            //   83bdf4ecffff07       | cmp                 dword ptr [ebp - 0x130c], 7
            //   8d85e0ecffff         | lea                 eax, [ebp - 0x1320]
            //   51                   | push                ecx
            //   0f4785e0ecffff       | cmova               eax, dword ptr [ebp - 0x1320]

        $sequence_8 = { 50 8d45f4 64a300000000 8bf9 89bd34feffff 89bd6cfeffff 89bd6cfeffff }
            // n = 7, score = 100
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   8bf9                 | mov                 edi, ecx
            //   89bd34feffff         | mov                 dword ptr [ebp - 0x1cc], edi
            //   89bd6cfeffff         | mov                 dword ptr [ebp - 0x194], edi
            //   89bd6cfeffff         | mov                 dword ptr [ebp - 0x194], edi

        $sequence_9 = { 83c408 c785f8fdffff11000000 81ce00020000 898dfcfdffff 33d2 0f1100 }
            // n = 6, score = 100
            //   83c408               | add                 esp, 8
            //   c785f8fdffff11000000     | mov    dword ptr [ebp - 0x208], 0x11
            //   81ce00020000         | or                  esi, 0x200
            //   898dfcfdffff         | mov                 dword ptr [ebp - 0x204], ecx
            //   33d2                 | xor                 edx, edx
            //   0f1100               | movups              xmmword ptr [eax], xmm0

    condition:
        7 of them and filesize < 906240
}