rule win_kuluoz_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.kuluoz."
        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.kuluoz"
        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 = { 8b4508 83b84e12000001 7404 32c0 eb7f 8b4d10 51 }
            // n = 7, score = 100
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   83b84e12000001       | cmp                 dword ptr [eax + 0x124e], 1
            //   7404                 | je                  6
            //   32c0                 | xor                 al, al
            //   eb7f                 | jmp                 0x81
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]
            //   51                   | push                ecx

        $sequence_1 = { 3395f4feffff 8985f0feffff 8995f4feffff 68ff000000 8d8df8feffff 51 e8???????? }
            // n = 7, score = 100
            //   3395f4feffff         | xor                 edx, dword ptr [ebp - 0x10c]
            //   8985f0feffff         | mov                 dword ptr [ebp - 0x110], eax
            //   8995f4feffff         | mov                 dword ptr [ebp - 0x10c], edx
            //   68ff000000           | push                0xff
            //   8d8df8feffff         | lea                 ecx, [ebp - 0x108]
            //   51                   | push                ecx
            //   e8????????           |                     

        $sequence_2 = { 8b4dc8 51 ff55e0 8945c4 8b55d4 8b02 3b45c4 }
            // n = 7, score = 100
            //   8b4dc8               | mov                 ecx, dword ptr [ebp - 0x38]
            //   51                   | push                ecx
            //   ff55e0               | call                dword ptr [ebp - 0x20]
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   8b55d4               | mov                 edx, dword ptr [ebp - 0x2c]
            //   8b02                 | mov                 eax, dword ptr [edx]
            //   3b45c4               | cmp                 eax, dword ptr [ebp - 0x3c]

        $sequence_3 = { e8???????? 0fb6c0 85c0 0f84e6000000 8d4df4 51 8d9578ffffff }
            // n = 7, score = 100
            //   e8????????           |                     
            //   0fb6c0               | movzx               eax, al
            //   85c0                 | test                eax, eax
            //   0f84e6000000         | je                  0xec
            //   8d4df4               | lea                 ecx, [ebp - 0xc]
            //   51                   | push                ecx
            //   8d9578ffffff         | lea                 edx, [ebp - 0x88]

        $sequence_4 = { 894d0c 8b5510 2b55f8 895510 8b45fc 0345f8 8945fc }
            // n = 7, score = 100
            //   894d0c               | mov                 dword ptr [ebp + 0xc], ecx
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   2b55f8               | sub                 edx, dword ptr [ebp - 8]
            //   895510               | mov                 dword ptr [ebp + 0x10], edx
            //   8b45fc               | mov                 eax, dword ptr [ebp - 4]
            //   0345f8               | add                 eax, dword ptr [ebp - 8]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax

        $sequence_5 = { 8945f0 8b4de8 894df4 8b55ec 8955f8 8b45f0 }
            // n = 6, score = 100
            //   8945f0               | mov                 dword ptr [ebp - 0x10], eax
            //   8b4de8               | mov                 ecx, dword ptr [ebp - 0x18]
            //   894df4               | mov                 dword ptr [ebp - 0xc], ecx
            //   8b55ec               | mov                 edx, dword ptr [ebp - 0x14]
            //   8955f8               | mov                 dword ptr [ebp - 8], edx
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]

        $sequence_6 = { c745fc00000000 eb09 8b4dfc 83c101 894dfc 837dfc08 7328 }
            // n = 7, score = 100
            //   c745fc00000000       | mov                 dword ptr [ebp - 4], 0
            //   eb09                 | jmp                 0xb
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c101               | add                 ecx, 1
            //   894dfc               | mov                 dword ptr [ebp - 4], ecx
            //   837dfc08             | cmp                 dword ptr [ebp - 4], 8
            //   7328                 | jae                 0x2a

        $sequence_7 = { eb5a 68???????? 8b5508 81c206020000 52 ff15???????? }
            // n = 6, score = 100
            //   eb5a                 | jmp                 0x5c
            //   68????????           |                     
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   81c206020000         | add                 edx, 0x206
            //   52                   | push                edx
            //   ff15????????         |                     

        $sequence_8 = { 50 e8???????? e9???????? 8d8decfbffff 51 }
            // n = 5, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   e9????????           |                     
            //   8d8decfbffff         | lea                 ecx, [ebp - 0x414]
            //   51                   | push                ecx

        $sequence_9 = { 6a04 8d45e4 50 8b8d64fdffff }
            // n = 4, score = 100
            //   6a04                 | push                4
            //   8d45e4               | lea                 eax, [ebp - 0x1c]
            //   50                   | push                eax
            //   8b8d64fdffff         | mov                 ecx, dword ptr [ebp - 0x29c]

    condition:
        7 of them and filesize < 65536
}