rule win_flashflood_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2023-03-28"
        version = "1"
        description = "Detects win.flashflood."
        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.flashflood"
        malpedia_rule_date = "20230328"
        malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d"
        malpedia_version = "20230407"
        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 = { 83f8ff 8945fc 746b 57 6880000000 6a03 }
            // n = 6, score = 100
            //   83f8ff               | cmp                 eax, -1
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   746b                 | je                  0x6d
            //   57                   | push                edi
            //   6880000000           | push                0x80
            //   6a03                 | push                3

        $sequence_1 = { 7422 bf???????? ff37 56 }
            // n = 4, score = 100
            //   7422                 | je                  0x24
            //   bf????????           |                     
            //   ff37                 | push                dword ptr [edi]
            //   56                   | push                esi

        $sequence_2 = { 0f85de010000 8b45ec 8d55dc 52 8d55e4 8b08 }
            // n = 6, score = 100
            //   0f85de010000         | jne                 0x1e4
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   8d55dc               | lea                 edx, [ebp - 0x24]
            //   52                   | push                edx
            //   8d55e4               | lea                 edx, [ebp - 0x1c]
            //   8b08                 | mov                 ecx, dword ptr [eax]

        $sequence_3 = { 59 8945f8 85c0 59 0f848c000000 0fbec3 c1e004 }
            // n = 7, score = 100
            //   59                   | pop                 ecx
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   0f848c000000         | je                  0x92
            //   0fbec3               | movsx               eax, bl
            //   c1e004               | shl                 eax, 4

        $sequence_4 = { 8b45f0 25ff000000 33c9 8a88b09a4000 8b5508 }
            // n = 5, score = 100
            //   8b45f0               | mov                 eax, dword ptr [ebp - 0x10]
            //   25ff000000           | and                 eax, 0xff
            //   33c9                 | xor                 ecx, ecx
            //   8a88b09a4000         | mov                 cl, byte ptr [eax + 0x409ab0]
            //   8b5508               | mov                 edx, dword ptr [ebp + 8]

        $sequence_5 = { 85c0 7411 83c610 81fe???????? 7cd6 33c0 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   7411                 | je                  0x13
            //   83c610               | add                 esi, 0x10
            //   81fe????????         |                     
            //   7cd6                 | jl                  0xffffffd8
            //   33c0                 | xor                 eax, eax

        $sequence_6 = { 6800020000 50 ff15???????? 8d85fffdffff 68???????? 50 }
            // n = 6, score = 100
            //   6800020000           | push                0x200
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d85fffdffff         | lea                 eax, [ebp - 0x201]
            //   68????????           |                     
            //   50                   | push                eax

        $sequence_7 = { 85c0 7412 e9???????? ff75fc ff15???????? 33c0 eb0c }
            // n = 7, score = 100
            //   85c0                 | test                eax, eax
            //   7412                 | je                  0x14
            //   e9????????           |                     
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   ff15????????         |                     
            //   33c0                 | xor                 eax, eax
            //   eb0c                 | jmp                 0xe

        $sequence_8 = { 50 e8???????? 85c0 59 756e 8d85ecfeffff 50 }
            // n = 7, score = 100
            //   50                   | push                eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   756e                 | jne                 0x70
            //   8d85ecfeffff         | lea                 eax, [ebp - 0x114]
            //   50                   | push                eax

        $sequence_9 = { 50 8d8518ffffff 6880000000 50 53 ff15???????? }
            // n = 6, score = 100
            //   50                   | push                eax
            //   8d8518ffffff         | lea                 eax, [ebp - 0xe8]
            //   6880000000           | push                0x80
            //   50                   | push                eax
            //   53                   | push                ebx
            //   ff15????????         |                     

    condition:
        7 of them and filesize < 114688
}