rule win_rambo_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.rambo."
        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.rambo"
        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 = { 56 6800040000 8d85f8faffff 6a00 50 e8???????? 83c40c }
            // n = 7, score = 200
            //   56                   | push                esi
            //   6800040000           | push                0x400
            //   8d85f8faffff         | lea                 eax, [ebp - 0x508]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc

        $sequence_1 = { 8d85f8feffff 50 c645fc72 c645fd62 ff15???????? 8bf0 }
            // n = 6, score = 200
            //   8d85f8feffff         | lea                 eax, [ebp - 0x108]
            //   50                   | push                eax
            //   c645fc72             | mov                 byte ptr [ebp - 4], 0x72
            //   c645fd62             | mov                 byte ptr [ebp - 3], 0x62
            //   ff15????????         |                     
            //   8bf0                 | mov                 esi, eax

        $sequence_2 = { 83c420 85f6 7437 56 }
            // n = 4, score = 200
            //   83c420               | add                 esp, 0x20
            //   85f6                 | test                esi, esi
            //   7437                 | je                  0x39
            //   56                   | push                esi

        $sequence_3 = { 59 50 ff7508 ff15???????? 56 ff15???????? }
            // n = 6, score = 200
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]
            //   ff15????????         |                     
            //   56                   | push                esi
            //   ff15????????         |                     

        $sequence_4 = { 6a32 ff15???????? 8d85f8faffff 50 68???????? e8???????? 59 }
            // n = 7, score = 200
            //   6a32                 | push                0x32
            //   ff15????????         |                     
            //   8d85f8faffff         | lea                 eax, [ebp - 0x508]
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   59                   | pop                 ecx

        $sequence_5 = { 56 ff15???????? 8d85ecfdffff 50 8d85f0feffff 50 ff15???????? }
            // n = 7, score = 200
            //   56                   | push                esi
            //   ff15????????         |                     
            //   8d85ecfdffff         | lea                 eax, [ebp - 0x214]
            //   50                   | push                eax
            //   8d85f0feffff         | lea                 eax, [ebp - 0x110]
            //   50                   | push                eax
            //   ff15????????         |                     

        $sequence_6 = { 8d85fcfeffff 50 e8???????? 59 8d85fcfeffff 59 }
            // n = 6, score = 200
            //   8d85fcfeffff         | lea                 eax, [ebp - 0x104]
            //   50                   | push                eax
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   8d85fcfeffff         | lea                 eax, [ebp - 0x104]
            //   59                   | pop                 ecx

        $sequence_7 = { 56 6a01 ff7508 e8???????? 59 50 ff7508 }
            // n = 7, score = 200
            //   56                   | push                esi
            //   6a01                 | push                1
            //   ff7508               | push                dword ptr [ebp + 8]
            //   e8????????           |                     
            //   59                   | pop                 ecx
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_8 = { 8d4c2424 c684240804000013 e8???????? 50 }
            // n = 4, score = 100
            //   8d4c2424             | lea                 ecx, [esp + 0x24]
            //   c684240804000013     | mov                 byte ptr [esp + 0x408], 0x13
            //   e8????????           |                     
            //   50                   | push                eax

        $sequence_9 = { 68???????? 6801000080 ff15???????? 85c0 756b }
            // n = 5, score = 100
            //   68????????           |                     
            //   6801000080           | push                0x80000001
            //   ff15????????         |                     
            //   85c0                 | test                eax, eax
            //   756b                 | jne                 0x6d

        $sequence_10 = { c644245135 885c2452 c644245438 c644245531 c644245637 }
            // n = 5, score = 100
            //   c644245135           | mov                 byte ptr [esp + 0x51], 0x35
            //   885c2452             | mov                 byte ptr [esp + 0x52], bl
            //   c644245438           | mov                 byte ptr [esp + 0x54], 0x38
            //   c644245531           | mov                 byte ptr [esp + 0x55], 0x31
            //   c644245637           | mov                 byte ptr [esp + 0x56], 0x37

        $sequence_11 = { 75ef ff15???????? 5f 5e }
            // n = 4, score = 100
            //   75ef                 | jne                 0xfffffff1
            //   ff15????????         |                     
            //   5f                   | pop                 edi
            //   5e                   | pop                 esi

        $sequence_12 = { e8???????? 89842494000000 8b442424 6a00 50 8d8c24a4000000 }
            // n = 6, score = 100
            //   e8????????           |                     
            //   89842494000000       | mov                 dword ptr [esp + 0x94], eax
            //   8b442424             | mov                 eax, dword ptr [esp + 0x24]
            //   6a00                 | push                0
            //   50                   | push                eax
            //   8d8c24a4000000       | lea                 ecx, [esp + 0xa4]

        $sequence_13 = { c684240404000009 e8???????? 8d4c2410 c684240004000007 e8???????? 68b6000000 8d542414 }
            // n = 7, score = 100
            //   c684240404000009     | mov                 byte ptr [esp + 0x404], 9
            //   e8????????           |                     
            //   8d4c2410             | lea                 ecx, [esp + 0x10]
            //   c684240004000007     | mov                 byte ptr [esp + 0x400], 7
            //   e8????????           |                     
            //   68b6000000           | push                0xb6
            //   8d542414             | lea                 edx, [esp + 0x14]

        $sequence_14 = { e8???????? b941000000 33c0 8dbc24ec000000 be???????? f3ab }
            // n = 6, score = 100
            //   e8????????           |                     
            //   b941000000           | mov                 ecx, 0x41
            //   33c0                 | xor                 eax, eax
            //   8dbc24ec000000       | lea                 edi, [esp + 0xec]
            //   be????????           |                     
            //   f3ab                 | rep stosd           dword ptr es:[edi], eax

        $sequence_15 = { 8d8c2488000000 e8???????? 55 55 }
            // n = 4, score = 100
            //   8d8c2488000000       | lea                 ecx, [esp + 0x88]
            //   e8????????           |                     
            //   55                   | push                ebp
            //   55                   | push                ebp

    condition:
        7 of them and filesize < 57344
}