rule win_mongall_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.mongall."
        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.mongall"
        malpedia_rule_date = "20260916"
        malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6"
        malpedia_version = "20260917"
        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 = { 50 ffd7 8bc3 8da5e0fdffff }
            // n = 4, score = 100
            //   50                   | push                eax
            //   ffd7                 | call                edi
            //   8bc3                 | mov                 eax, ebx
            //   8da5e0fdffff         | lea                 esp, [ebp - 0x220]

        $sequence_1 = { ff15???????? 85c0 0f84b2000000 6a7f 8d857dffffff 6a00 }
            // n = 6, score = 100
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   0f84b2000000         | je                  0xb8
            //   6a7f                 | push                0x7f
            //   8d857dffffff         | lea                 eax, [ebp - 0x83]
            //   6a00                 | push                0

        $sequence_2 = { 8d4598 50 ff15???????? 2bf6 3935???????? 750b }
            // n = 6, score = 100
            //   8d4598               | lea                 eax, [ebp - 0x68]
            //   50                   | push                eax
            //   ff15????????         |                     
            //   2bf6                 | sub                 esi, esi
            //   3935????????         |                     
            //   750b                 | jne                 0xd

        $sequence_3 = { 0fbe84c248e24000 c1f804 8985a4fdffff 83f807 0f87c8090000 ff2485b83f4000 33c0 }
            // n = 7, score = 100
            //   0fbe84c248e24000     | movsx               eax, byte ptr [edx + eax*8 + 0x40e248]
            //   c1f804               | sar                 eax, 4
            //   8985a4fdffff         | mov                 dword ptr [ebp - 0x25c], eax
            //   83f807               | cmp                 eax, 7
            //   0f87c8090000         | ja                  0x9ce
            //   ff2485b83f4000       | jmp                 dword ptr [eax*4 + 0x403fb8]
            //   33c0                 | xor                 eax, eax

        $sequence_4 = { 6a00 56 e8???????? 8b8d6cf8ffff }
            // n = 4, score = 100
            //   6a00                 | push                0
            //   56                   | push                esi
            //   e8????????           |                     
            //   8b8d6cf8ffff         | mov                 ecx, dword ptr [ebp - 0x794]

        $sequence_5 = { 84d2 75f9 8dbdfcfdffff 2bc1 4f 8a4f01 47 }
            // n = 7, score = 100
            //   84d2                 | test                dl, dl
            //   75f9                 | jne                 0xfffffffb
            //   8dbdfcfdffff         | lea                 edi, [ebp - 0x204]
            //   2bc1                 | sub                 eax, ecx
            //   4f                   | dec                 edi
            //   8a4f01               | mov                 cl, byte ptr [edi + 1]
            //   47                   | inc                 edi

        $sequence_6 = { e8???????? 83c40c eb14 8d95f8fdffff 68???????? }
            // n = 5, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   eb14                 | jmp                 0x16
            //   8d95f8fdffff         | lea                 edx, [ebp - 0x208]
            //   68????????           |                     

        $sequence_7 = { 57 6a00 50 8945f8 e8???????? 83c410 }
            // n = 6, score = 100
            //   57                   | push                edi
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10

        $sequence_8 = { 50 ffd6 eb06 8b35???????? 6a00 6880000000 }
            // n = 6, score = 100
            //   50                   | push                eax
            //   ffd6                 | call                esi
            //   eb06                 | jmp                 8
            //   8b35????????         |                     
            //   6a00                 | push                0
            //   6880000000           | push                0x80

        $sequence_9 = { 8bf7 85ff 7e2a 6a30 }
            // n = 4, score = 100
            //   8bf7                 | mov                 esi, edi
            //   85ff                 | test                edi, edi
            //   7e2a                 | jle                 0x2c
            //   6a30                 | push                0x30

    condition:
        7 of them and filesize < 199680
}