rule win_rofin_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.rofin."
        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.rofin"
        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 = { ffd5 85c0 740e 837c241801 7407 33db e9???????? }
            // n = 7, score = 100
            //   ffd5                 | call                ebp
            //   85c0                 | test                eax, eax
            //   740e                 | je                  0x10
            //   837c241801           | cmp                 dword ptr [esp + 0x18], 1
            //   7407                 | je                  9
            //   33db                 | xor                 ebx, ebx
            //   e9????????           |                     

        $sequence_1 = { f3ab 53 8d442410 6a25 50 53 }
            // n = 6, score = 100
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax
            //   53                   | push                ebx
            //   8d442410             | lea                 eax, [esp + 0x10]
            //   6a25                 | push                0x25
            //   50                   | push                eax
            //   53                   | push                ebx

        $sequence_2 = { f2ae f7d1 2bf9 8944241c 89442420 8d542424 }
            // n = 6, score = 100
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx
            //   2bf9                 | sub                 edi, ecx
            //   8944241c             | mov                 dword ptr [esp + 0x1c], eax
            //   89442420             | mov                 dword ptr [esp + 0x20], eax
            //   8d542424             | lea                 edx, [esp + 0x24]

        $sequence_3 = { 81e1ff000000 83c920 eb0c 8b742414 8bce 81e1ff000000 }
            // n = 6, score = 100
            //   81e1ff000000         | and                 ecx, 0xff
            //   83c920               | or                  ecx, 0x20
            //   eb0c                 | jmp                 0xe
            //   8b742414             | mov                 esi, dword ptr [esp + 0x14]
            //   8bce                 | mov                 ecx, esi
            //   81e1ff000000         | and                 ecx, 0xff

        $sequence_4 = { 8b442414 85c0 0f845a010000 b9ff000000 33c0 8dbc2491000000 }
            // n = 6, score = 100
            //   8b442414             | mov                 eax, dword ptr [esp + 0x14]
            //   85c0                 | test                eax, eax
            //   0f845a010000         | je                  0x160
            //   b9ff000000           | mov                 ecx, 0xff
            //   33c0                 | xor                 eax, eax
            //   8dbc2491000000       | lea                 edi, [esp + 0x91]

        $sequence_5 = { 0f841a090000 ff15???????? 8b942404090000 8b4c2478 52 66c78424880000000200 898c248c000000 }
            // n = 7, score = 100
            //   0f841a090000         | je                  0x920
            //   ff15????????         |                     
            //   8b942404090000       | mov                 edx, dword ptr [esp + 0x904]
            //   8b4c2478             | mov                 ecx, dword ptr [esp + 0x78]
            //   52                   | push                edx
            //   66c78424880000000200     | mov    word ptr [esp + 0x88], 2
            //   898c248c000000       | mov                 dword ptr [esp + 0x8c], ecx

        $sequence_6 = { 8a442407 895a18 895a1c 895a20 884a24 8a4c2407 55 }
            // n = 7, score = 100
            //   8a442407             | mov                 al, byte ptr [esp + 7]
            //   895a18               | mov                 dword ptr [edx + 0x18], ebx
            //   895a1c               | mov                 dword ptr [edx + 0x1c], ebx
            //   895a20               | mov                 dword ptr [edx + 0x20], ebx
            //   884a24               | mov                 byte ptr [edx + 0x24], cl
            //   8a4c2407             | mov                 cl, byte ptr [esp + 7]
            //   55                   | push                ebp

        $sequence_7 = { e8???????? f7d8 1bc0 f7d8 89442444 68???????? 8d8c2498000000 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   f7d8                 | neg                 eax
            //   1bc0                 | sbb                 eax, eax
            //   f7d8                 | neg                 eax
            //   89442444             | mov                 dword ptr [esp + 0x44], eax
            //   68????????           |                     
            //   8d8c2498000000       | lea                 ecx, [esp + 0x98]

        $sequence_8 = { e8???????? eb73 bf???????? 83c9ff 33c0 f2ae f7d1 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   eb73                 | jmp                 0x75
            //   bf????????           |                     
            //   83c9ff               | or                  ecx, 0xffffffff
            //   33c0                 | xor                 eax, eax
            //   f2ae                 | repne scasb         al, byte ptr es:[edi]
            //   f7d1                 | not                 ecx

        $sequence_9 = { ff15???????? 2b442424 3d30750000 770e 3bf5 0f855bfbffff eb04 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   2b442424             | sub                 eax, dword ptr [esp + 0x24]
            //   3d30750000           | cmp                 eax, 0x7530
            //   770e                 | ja                  0x10
            //   3bf5                 | cmp                 esi, ebp
            //   0f855bfbffff         | jne                 0xfffffb61
            //   eb04                 | jmp                 6

    condition:
        7 of them and filesize < 409600
}