rule win_bluenoroff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.bluenoroff."
        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.bluenoroff"
        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 = { 52 8d4608 50 83c709 57 894e04 }
            // n = 6, score = 300
            //   52                   | push                edx
            //   8d4608               | lea                 eax, [esi + 8]
            //   50                   | push                eax
            //   83c709               | add                 edi, 9
            //   57                   | push                edi
            //   894e04               | mov                 dword ptr [esi + 4], ecx

        $sequence_1 = { 83c410 6a00 68???????? ff15???????? 6a00 }
            // n = 5, score = 300
            //   83c410               | add                 esp, 0x10
            //   6a00                 | push                0
            //   68????????           |                     
            //   ff15????????         |                     
            //   6a00                 | push                0

        $sequence_2 = { 57 ff15???????? 33ff 53 ff15???????? 8b450c 85c0 }
            // n = 7, score = 300
            //   57                   | push                edi
            //   ff15????????         |                     
            //   33ff                 | xor                 edi, edi
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_3 = { 8906 8b5004 8902 8b45f8 40 81c348040000 8945f8 }
            // n = 7, score = 300
            //   8906                 | mov                 dword ptr [esi], eax
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   8902                 | mov                 dword ptr [edx], eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   40                   | inc                 eax
            //   81c348040000         | add                 ebx, 0x448
            //   8945f8               | mov                 dword ptr [ebp - 8], eax

        $sequence_4 = { 668985fafffeff ff15???????? 68???????? 68???????? }
            // n = 4, score = 300
            //   668985fafffeff       | mov                 word ptr [ebp - 0x10006], ax
            //   ff15????????         |                     
            //   68????????           |                     
            //   68????????           |                     

        $sequence_5 = { 8b550c 52 8d85f8feffff 33c9 57 50 66894df8 }
            // n = 7, score = 300
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   52                   | push                edx
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   33c9                 | xor                 ecx, ecx
            //   57                   | push                edi
            //   50                   | push                eax
            //   66894df8             | mov                 word ptr [ebp - 8], cx

        $sequence_6 = { 8985f2fffeff 8985f6fffeff 668985fafffeff ff15???????? 68???????? }
            // n = 5, score = 300
            //   8985f2fffeff         | mov                 dword ptr [ebp - 0x1000e], eax
            //   8985f6fffeff         | mov                 dword ptr [ebp - 0x1000a], eax
            //   668985fafffeff       | mov                 word ptr [ebp - 0x10006], ax
            //   ff15????????         |                     
            //   68????????           |                     

        $sequence_7 = { ff15???????? 33ff 53 ff15???????? 8b450c 85c0 }
            // n = 6, score = 300
            //   ff15????????         |                     
            //   33ff                 | xor                 edi, edi
            //   53                   | push                ebx
            //   ff15????????         |                     
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   85c0                 | test                eax, eax

        $sequence_8 = { 83feff 7433 8d4e01 51 6a40 }
            // n = 5, score = 300
            //   83feff               | cmp                 esi, -1
            //   7433                 | je                  0x35
            //   8d4e01               | lea                 ecx, [esi + 1]
            //   51                   | push                ecx
            //   6a40                 | push                0x40

        $sequence_9 = { 8b5514 85d2 0f8e7e000000 8b4d0c 8b4508 53 56 }
            // n = 7, score = 300
            //   8b5514               | mov                 edx, dword ptr [ebp + 0x14]
            //   85d2                 | test                edx, edx
            //   0f8e7e000000         | jle                 0x84
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   56                   | push                esi

    condition:
        7 of them and filesize < 303104
}