rule win_flashflood_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        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 = "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 = { ff15???????? 8bf0 59 85f6 59 741c 56 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax
            //   59                   | pop                 ecx
            //   85f6                 | test                esi, esi
            //   59                   | pop                 ecx
            //   741c                 | je                  0x1e
            //   56                   | push                esi

        $sequence_1 = { 85c0 753e 8d857cffffff 50 8d853cf9ffff 50 }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   753e                 | jne                 0x40
            //   8d857cffffff         | lea                 eax, [ebp - 0x84]
            //   50                   | push                eax
            //   8d853cf9ffff         | lea                 eax, [ebp - 0x6c4]
            //   50                   | push                eax

        $sequence_2 = { 817d0c00010000 7310 8b550c 33c0 8a82b0984000 8945fc eb11 }
            // n = 7, score = 100
            //   817d0c00010000       | cmp                 dword ptr [ebp + 0xc], 0x100
            //   7310                 | jae                 0x12
            //   8b550c               | mov                 edx, dword ptr [ebp + 0xc]
            //   33c0                 | xor                 eax, eax
            //   8a82b0984000         | mov                 al, byte ptr [edx + 0x4098b0]
            //   8945fc               | mov                 dword ptr [ebp - 4], eax
            //   eb11                 | jmp                 0x13

        $sequence_3 = { e8???????? e8???????? 8d85fcfdffff 53 50 e8???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   e8????????           |                     
            //   8d85fcfdffff         | lea                 eax, [ebp - 0x204]
            //   53                   | push                ebx
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_4 = { ffd6 53 ff75fc 6a01 }
            // n = 4, score = 100
            //   ffd6                 | call                esi
            //   53                   | push                ebx
            //   ff75fc               | push                dword ptr [ebp - 4]
            //   6a01                 | push                1

        $sequence_5 = { ff15???????? 85c0 7410 83c704 81ff???????? }
            // n = 5, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   7410                 | je                  0x12
            //   83c704               | add                 edi, 4
            //   81ff????????         |                     

        $sequence_6 = { 6a00 50 ff15???????? 8d85a8fcffff }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8d85a8fcffff         | lea                 eax, [ebp - 0x358]

        $sequence_7 = { e8???????? 85c0 59 7411 6a00 ff750c }
            // n = 6, score = 100
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   59                   | pop                 ecx
            //   7411                 | je                  0x13
            //   6a00                 | push                0
            //   ff750c               | push                dword ptr [ebp + 0xc]

        $sequence_8 = { 6a00 68???????? ff15???????? 68???????? ffd7 }
            // n = 5, score = 100
            //   6a00                 | push                0
            //   68????????           |                     
            //   ff15????????         |                     
            //   68????????           |                     
            //   ffd7                 | call                edi

        $sequence_9 = { 40 8945f8 0fbe06 50 ff15???????? 8bf8 }
            // n = 6, score = 100
            //   40                   | inc                 eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   0fbe06               | movsx               eax, byte ptr [esi]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   8bf8                 | mov                 edi, eax

    condition:
        7 of them and filesize < 114688
}