rule win_bibi_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.bibi."
        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.bibi"
        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 = { 8bda 4c8d05a25a0100 488bf9 488d1538470100 b904000000 e8???????? 8bd3 }
            // n = 7, score = 100
            //   8bda                 | mov                 eax, edi
            //   4c8d05a25a0100       | dec                 ecx
            //   488bf9               | mov                 edx, esi
            //   488d1538470100       | inc                 ecx
            //   b904000000           | mov                 ecx, esp
            //   e8????????           |                     
            //   8bd3                 | dec                 eax

        $sequence_1 = { 7403 48ffcf 410fb6d3 4c8d0d07f10000 83f201 03d2 8bc2 }
            // n = 7, score = 100
            //   7403                 | mov                 word ptr [esp + 0x38], si
            //   48ffcf               | dec                 eax
            //   410fb6d3             | mov                 edx, dword ptr [esp + 0xb0]
            //   4c8d0d07f10000       | dec                 eax
            //   83f201               | cmp                 edx, 8
            //   03d2                 | jb                  0x3d0
            //   8bc2                 | dec                 eax

        $sequence_2 = { 8bc7 f00fc14108 83f801 0f8540f4ffff }
            // n = 4, score = 100
            //   8bc7                 | nop                 
            //   f00fc14108           | mov                 ecx, edx
            //   83f801               | dec                 ebp
            //   0f8540f4ffff         | lea                 eax, [eax + 4]

        $sequence_3 = { 66f3ab 498d0410 6645892441 eb0b 4c8bca 488bce e8???????? }
            // n = 7, score = 100
            //   66f3ab               | dec                 eax
            //   498d0410             | mov                 eax, dword ptr [ebp - 0x31]
            //   6645892441           | dec                 ecx
            //   eb0b                 | cmove               eax, edi
            //   4c8bca               | dec                 eax
            //   488bce               | mov                 dword ptr [ebp - 0x31], eax
            //   e8????????           |                     

        $sequence_4 = { 4883ec20 33f6 4533f6 4863ce 488d3db8e70100 }
            // n = 5, score = 100
            //   4883ec20             | sub                 esp, 0x38
            //   33f6                 | dec                 esp
            //   4533f6               | arpl                cx, bp
            //   4863ce               | dec                 esp
            //   488d3db8e70100       | lea                 ecx, [0xfffebee9]

        $sequence_5 = { c5fb102d???????? c4e2c9abe9 f2410f1004c1 488d15a2bf0000 }
            // n = 4, score = 100
            //   c5fb102d????????     |                     
            //   c4e2c9abe9           | add                 eax, 0x24
            //   f2410f1004c1         | jne                 0x20
            //   488d15a2bf0000       | dec                 eax

        $sequence_6 = { e8???????? 33c0 884548 b801000000 864548 458bf5 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   33c0                 | mov                 dword ptr [esp + 0x30], ebx
            //   884548               | inc                 ebp
            //   b801000000           | xor                 ecx, ecx
            //   864548               | mov                 ecx, dword ptr [esp + 0x48]
            //   458bf5               | lea                 edx, [eax + 1]

        $sequence_7 = { 488d41f8 4883f81f 773e 498bc8 e8???????? 4d896710 49c7471807000000 }
            // n = 7, score = 100
            //   488d41f8             | jb                  0x1db
            //   4883f81f             | dec                 eax
            //   773e                 | lea                 edi, [ecx + 5]
            //   498bc8               | dec                 eax
            //   e8????????           |                     
            //   4d896710             | mov                 dword ptr [esp + 0x48], edi
            //   49c7471807000000     | dec                 eax

        $sequence_8 = { 488bcb 48837b1808 7208 488b0b 0f1f440000 48ffc0 66833c4100 }
            // n = 7, score = 100
            //   488bcb               | dec                 eax
            //   48837b1808           | mov                 ecx, ebx
            //   7208                 | dec                 eax
            //   488b0b               | lea                 edx, [0x192c6]
            //   0f1f440000           | dec                 eax
            //   48ffc0               | mov                 ecx, ebx
            //   66833c4100           | mov                 eax, 8

        $sequence_9 = { 44897c2420 0f57c0 0f1145c7 f30f7f45b7 4c897dc7 }
            // n = 5, score = 100
            //   44897c2420           | lea                 ecx, [edi + 0x28]
            //   0f57c0               | dec                 eax
            //   0f1145c7             | lea                 edx, [ebx + 0x28]
            //   f30f7f45b7           | movups              xmmword ptr [eax + 0x10], xmm1
            //   4c897dc7             | dec                 eax

    condition:
        7 of them and filesize < 462848
}