rule win_diavol_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.diavol."
        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.diavol"
        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 = { 6a01 6a02 ff15???????? 8bf0 83feff 0f849f010000 33c0 }
            // n = 7, score = 100
            //   6a01                 | push                1
            //   6a02                 | push                2
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   83feff               | cmp                 esi, -1
            //   0f849f010000         | je                  0x1a5
            //   33c0                 | xor                 eax, eax

        $sequence_1 = { 56 33db 8bf1 8d95f8efffff 57 899d30c2ffff 899d34c2ffff }
            // n = 7, score = 100
            //   56                   | push                esi
            //   33db                 | xor                 ebx, ebx
            //   8bf1                 | mov                 esi, ecx
            //   8d95f8efffff         | lea                 edx, [ebp - 0x1008]
            //   57                   | push                edi
            //   899d30c2ffff         | mov                 dword ptr [ebp - 0x3dd0], ebx
            //   899d34c2ffff         | mov                 dword ptr [ebp - 0x3dcc], ebx

        $sequence_2 = { 7412 66837dfc2a 7431 663bca 7535 83c002 }
            // n = 6, score = 100
            //   7412                 | je                  0x14
            //   66837dfc2a           | cmp                 word ptr [ebp - 4], 0x2a
            //   7431                 | je                  0x33
            //   663bca               | cmp                 cx, dx
            //   7535                 | jne                 0x37
            //   83c002               | add                 eax, 2

        $sequence_3 = { 83c404 84c0 0f84d3000000 6800040000 8d95f8f9ffff 6a00 52 }
            // n = 7, score = 100
            //   83c404               | add                 esp, 4
            //   84c0                 | test                al, al
            //   0f84d3000000         | je                  0xd9
            //   6800040000           | push                0x400
            //   8d95f8f9ffff         | lea                 edx, [ebp - 0x608]
            //   6a00                 | push                0
            //   52                   | push                edx

        $sequence_4 = { 66890c45f0114100 40 ebe8 33c0 8945e4 3d01010000 7d0d }
            // n = 7, score = 100
            //   66890c45f0114100     | mov                 word ptr [eax*2 + 0x4111f0], cx
            //   40                   | inc                 eax
            //   ebe8                 | jmp                 0xffffffea
            //   33c0                 | xor                 eax, eax
            //   8945e4               | mov                 dword ptr [ebp - 0x1c], eax
            //   3d01010000           | cmp                 eax, 0x101
            //   7d0d                 | jge                 0xf

        $sequence_5 = { 8bd0 8d9b00000000 668b08 83c002 6685c9 75f5 8dbdf4efffff }
            // n = 7, score = 100
            //   8bd0                 | mov                 edx, eax
            //   8d9b00000000         | lea                 ebx, [ebx]
            //   668b08               | mov                 cx, word ptr [eax]
            //   83c002               | add                 eax, 2
            //   6685c9               | test                cx, cx
            //   75f5                 | jne                 0xfffffff7
            //   8dbdf4efffff         | lea                 edi, [ebp - 0x100c]

        $sequence_6 = { 8a8004064100 08443b1d 0fb64601 47 3bf8 76ea }
            // n = 6, score = 100
            //   8a8004064100         | mov                 al, byte ptr [eax + 0x410604]
            //   08443b1d             | or                  byte ptr [ebx + edi + 0x1d], al
            //   0fb64601             | movzx               eax, byte ptr [esi + 1]
            //   47                   | inc                 edi
            //   3bf8                 | cmp                 edi, eax
            //   76ea                 | jbe                 0xffffffec

        $sequence_7 = { 57 33ff ffb7500d4100 ff15???????? }
            // n = 4, score = 100
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   ffb7500d4100         | push                dword ptr [edi + 0x410d50]
            //   ff15????????         |                     

        $sequence_8 = { c785fcefffff00000000 e8???????? 6800020000 8d85a0fdffff 6a00 }
            // n = 5, score = 100
            //   c785fcefffff00000000     | mov    dword ptr [ebp - 0x1004], 0
            //   e8????????           |                     
            //   6800020000           | push                0x200
            //   8d85a0fdffff         | lea                 eax, [ebp - 0x260]
            //   6a00                 | push                0

        $sequence_9 = { 83c702 6685c0 75f4 a1???????? 8d8df4efffff }
            // n = 5, score = 100
            //   83c702               | add                 edi, 2
            //   6685c0               | test                ax, ax
            //   75f4                 | jne                 0xfffffff6
            //   a1????????           |                     
            //   8d8df4efffff         | lea                 ecx, [ebp - 0x100c]

    condition:
        7 of them and filesize < 191488
}