rule win_aurora_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.aurora."
        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.aurora"
        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 = { 50 e8???????? 8bb5c8feffff 56 ffd3 46 03f0 }
            // n = 7, score = 300
            //   50                   | push                eax
            //   e8????????           |                     
            //   8bb5c8feffff         | mov                 esi, dword ptr [ebp - 0x138]
            //   56                   | push                esi
            //   ffd3                 | call                ebx
            //   46                   | inc                 esi
            //   03f0                 | add                 esi, eax

        $sequence_1 = { 8d8db4f1ffff c785c8f1ffff0f000000 c785c4f1ffff00000000 c685b4f1ffff00 e8???????? }
            // n = 5, score = 300
            //   8d8db4f1ffff         | lea                 ecx, [ebp - 0xe4c]
            //   c785c8f1ffff0f000000     | mov    dword ptr [ebp - 0xe38], 0xf
            //   c785c4f1ffff00000000     | mov    dword ptr [ebp - 0xe3c], 0
            //   c685b4f1ffff00       | mov                 byte ptr [ebp - 0xe4c], 0
            //   e8????????           |                     

        $sequence_2 = { 0f57c0 83c608 660fd645e8 83ef01 0f856cffffff }
            // n = 5, score = 300
            //   0f57c0               | xorps               xmm0, xmm0
            //   83c608               | add                 esi, 8
            //   660fd645e8           | movq                qword ptr [ebp - 0x18], xmm0
            //   83ef01               | sub                 edi, 1
            //   0f856cffffff         | jne                 0xffffff72

        $sequence_3 = { e8???????? 6a03 68???????? 8d8d7cf0ffff c78590f0ffff0f000000 c7858cf0ffff00000000 c6857cf0ffff00 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   6a03                 | push                3
            //   68????????           |                     
            //   8d8d7cf0ffff         | lea                 ecx, [ebp - 0xf84]
            //   c78590f0ffff0f000000     | mov    dword ptr [ebp - 0xf70], 0xf
            //   c7858cf0ffff00000000     | mov    dword ptr [ebp - 0xf74], 0
            //   c6857cf0ffff00       | mov                 byte ptr [ebp - 0xf84], 0

        $sequence_4 = { e8???????? ff75e8 837dec10 8d45d8 6a00 0f4345d8 8d4da8 }
            // n = 7, score = 300
            //   e8????????           |                     
            //   ff75e8               | push                dword ptr [ebp - 0x18]
            //   837dec10             | cmp                 dword ptr [ebp - 0x14], 0x10
            //   8d45d8               | lea                 eax, [ebp - 0x28]
            //   6a00                 | push                0
            //   0f4345d8             | cmovae              eax, dword ptr [ebp - 0x28]
            //   8d4da8               | lea                 ecx, [ebp - 0x58]

        $sequence_5 = { 6a02 68???????? 8d8de4eeffff c785f8eeffff0f000000 }
            // n = 4, score = 300
            //   6a02                 | push                2
            //   68????????           |                     
            //   8d8de4eeffff         | lea                 ecx, [ebp - 0x111c]
            //   c785f8eeffff0f000000     | mov    dword ptr [ebp - 0x1108], 0xf

        $sequence_6 = { 52 8d4dd8 e8???????? c645fc01 8d4dc0 }
            // n = 5, score = 300
            //   52                   | push                edx
            //   8d4dd8               | lea                 ecx, [ebp - 0x28]
            //   e8????????           |                     
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   8d4dc0               | lea                 ecx, [ebp - 0x40]

        $sequence_7 = { 3c2f 0f85aa000000 837f1410 7204 8b07 eb02 }
            // n = 6, score = 300
            //   3c2f                 | cmp                 al, 0x2f
            //   0f85aa000000         | jne                 0xb0
            //   837f1410             | cmp                 dword ptr [edi + 0x14], 0x10
            //   7204                 | jb                  6
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   eb02                 | jmp                 4

        $sequence_8 = { 837e1410 8955c4 895610 7202 }
            // n = 4, score = 300
            //   837e1410             | cmp                 dword ptr [esi + 0x14], 0x10
            //   8955c4               | mov                 dword ptr [ebp - 0x3c], edx
            //   895610               | mov                 dword ptr [esi + 0x10], edx
            //   7202                 | jb                  4

        $sequence_9 = { 47 8d85d8feffff 50 8d8df8feffff }
            // n = 4, score = 300
            //   47                   | inc                 edi
            //   8d85d8feffff         | lea                 eax, [ebp - 0x128]
            //   50                   | push                eax
            //   8d8df8feffff         | lea                 ecx, [ebp - 0x108]

    condition:
        7 of them and filesize < 827392
}