rule win_bluenoroff_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        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 = "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 = { e8???????? 56 e8???????? 83c420 8b4dfc 33cd }
            // n = 6, score = 300
            //   e8????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c420               | add                 esp, 0x20
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   33cd                 | xor                 ecx, ebp

        $sequence_1 = { 7429 8b4508 8b5510 8b4d0c 8906 52 }
            // n = 6, score = 300
            //   7429                 | je                  0x2b
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8b5510               | mov                 edx, dword ptr [ebp + 0x10]
            //   8b4d0c               | mov                 ecx, dword ptr [ebp + 0xc]
            //   8906                 | mov                 dword ptr [esi], eax
            //   52                   | push                edx

        $sequence_2 = { e8???????? 8b5508 8d4d0c 51 52 8d85fcfffeff }
            // n = 6, score = 300
            //   e8????????           |                     
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]
            //   8d4d0c               | lea                 ecx, [ebp + 0xc]
            //   51                   | push                ecx
            //   52                   | push                edx
            //   8d85fcfffeff         | lea                 eax, [ebp - 0x10004]

        $sequence_3 = { 8bec 51 8b4508 53 6a00 }
            // n = 5, score = 300
            //   8bec                 | mov                 ebp, esp
            //   51                   | push                ecx
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   53                   | push                ebx
            //   6a00                 | push                0

        $sequence_4 = { 56 8d95f8feffff 56 52 e8???????? 8b4dfc 83c428 }
            // n = 7, score = 300
            //   56                   | push                esi
            //   8d95f8feffff         | lea                 edx, [ebp - 0x108]
            //   56                   | push                esi
            //   52                   | push                edx
            //   e8????????           |                     
            //   8b4dfc               | mov                 ecx, dword ptr [ebp - 4]
            //   83c428               | add                 esp, 0x28

        $sequence_5 = { 8b55fc 320c3a 880f b901000000 }
            // n = 4, score = 300
            //   8b55fc               | mov                 edx, dword ptr [ebp - 4]
            //   320c3a               | xor                 cl, byte ptr [edx + edi]
            //   880f                 | mov                 byte ptr [edi], cl
            //   b901000000           | mov                 ecx, 1

        $sequence_6 = { 881430 81f900010000 7ccb 5f 5e 5b }
            // n = 6, score = 300
            //   881430               | mov                 byte ptr [eax + esi], dl
            //   81f900010000         | cmp                 ecx, 0x100
            //   7ccb                 | jl                  0xffffffcd
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi
            //   5b                   | pop                 ebx

        $sequence_7 = { e8???????? b912010000 8bf3 f3a5 a1???????? 8b5004 83c410 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   b912010000           | mov                 ecx, 0x112
            //   8bf3                 | mov                 esi, ebx
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   a1????????           |                     
            //   8b5004               | mov                 edx, dword ptr [eax + 4]
            //   83c410               | add                 esp, 0x10

        $sequence_8 = { 8b7d10 66898e00010000 32db 8bc1 }
            // n = 4, score = 300
            //   8b7d10               | mov                 edi, dword ptr [ebp + 0x10]
            //   66898e00010000       | mov                 word ptr [esi + 0x100], cx
            //   32db                 | xor                 bl, bl
            //   8bc1                 | mov                 eax, ecx

        $sequence_9 = { 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

    condition:
        7 of them and filesize < 303104
}