rule win_fireball_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.fireball."
        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.fireball"
        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 = { b101 e8???????? 83c418 85c0 744f 6a01 }
            // n = 6, score = 100
            //   b101                 | mov                 cl, 1
            //   e8????????           |                     
            //   83c418               | add                 esp, 0x18
            //   85c0                 | test                eax, eax
            //   744f                 | je                  0x51
            //   6a01                 | push                1

        $sequence_1 = { e8???????? 56 e8???????? 83c404 33c0 83bc247001000008 c78424a001000007000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c404               | add                 esp, 4
            //   33c0                 | xor                 eax, eax
            //   83bc247001000008     | cmp                 dword ptr [esp + 0x170], 8
            //   c78424a001000007000000     | mov    dword ptr [esp + 0x1a0], 7

        $sequence_2 = { 8bb42444010000 8d4c240b e8???????? 51 e8???????? 8d4c240b e8???????? }
            // n = 7, score = 100
            //   8bb42444010000       | mov                 esi, dword ptr [esp + 0x144]
            //   8d4c240b             | lea                 ecx, [esp + 0xb]
            //   e8????????           |                     
            //   51                   | push                ecx
            //   e8????????           |                     
            //   8d4c240b             | lea                 ecx, [esp + 0xb]
            //   e8????????           |                     

        $sequence_3 = { eb76 56 e8???????? 59 8365fc00 8b049d000a2500 f644380401 }
            // n = 7, score = 100
            //   eb76                 | jmp                 0x78
            //   56                   | push                esi
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8365fc00             | and                 dword ptr [ebp - 4], 0
            //   8b049d000a2500       | mov                 eax, dword ptr [ebx*4 + 0x250a00]
            //   f644380401           | test                byte ptr [eax + edi + 4], 1

        $sequence_4 = { 668906 83c602 eb33 58 668906 8b0c95000a2500 }
            // n = 6, score = 100
            //   668906               | mov                 word ptr [esi], ax
            //   83c602               | add                 esi, 2
            //   eb33                 | jmp                 0x35
            //   58                   | pop                 eax
            //   668906               | mov                 word ptr [esi], ax
            //   8b0c95000a2500       | mov                 ecx, dword ptr [edx*4 + 0x250a00]

        $sequence_5 = { 8bf7 2b349d000a2500 c1fe06 8bc3 c1e005 03f0 }
            // n = 6, score = 100
            //   8bf7                 | mov                 esi, edi
            //   2b349d000a2500       | sub                 esi, dword ptr [ebx*4 + 0x250a00]
            //   c1fe06               | sar                 esi, 6
            //   8bc3                 | mov                 eax, ebx
            //   c1e005               | shl                 eax, 5
            //   03f0                 | add                 esi, eax

        $sequence_6 = { 8b45f4 59 7471 8b0c85000a2500 f644190480 7463 8d45e0 }
            // n = 7, score = 100
            //   8b45f4               | mov                 eax, dword ptr [ebp - 0xc]
            //   59                   | pop                 ecx
            //   7471                 | je                  0x73
            //   8b0c85000a2500       | mov                 ecx, dword ptr [eax*4 + 0x250a00]
            //   f644190480           | test                byte ptr [ecx + ebx + 4], 0x80
            //   7463                 | je                  0x65
            //   8d45e0               | lea                 eax, [ebp - 0x20]

        $sequence_7 = { 6800100000 8d85fcefffff 6a01 50 e8???????? 83c410 33d2 }
            // n = 7, score = 100
            //   6800100000           | push                0x1000
            //   8d85fcefffff         | lea                 eax, [ebp - 0x1004]
            //   6a01                 | push                1
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   33d2                 | xor                 edx, edx

        $sequence_8 = { e8???????? 83c410 85c0 7560 8d642400 57 6800100000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   85c0                 | test                eax, eax
            //   7560                 | jne                 0x62
            //   8d642400             | lea                 esp, [esp]
            //   57                   | push                edi
            //   6800100000           | push                0x1000

        $sequence_9 = { 64a300000000 6a01 33c0 68???????? 8d8c2404010000 c784241801000007000000 c784241401000000000000 }
            // n = 7, score = 100
            //   64a300000000         | mov                 dword ptr fs:[0], eax
            //   6a01                 | push                1
            //   33c0                 | xor                 eax, eax
            //   68????????           |                     
            //   8d8c2404010000       | lea                 ecx, [esp + 0x104]
            //   c784241801000007000000     | mov    dword ptr [esp + 0x118], 7
            //   c784241401000000000000     | mov    dword ptr [esp + 0x114], 0

    condition:
        7 of them and filesize < 335872
}