rule win_jelus_rat_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.jelus_rat."
        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.jelus_rat"
        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 = { e8???????? 90 488d4d8f e8???????? 488b4d87 4885c9 7411 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   90                   | push                ebp
            //   488d4d8f             | inc                 ecx
            //   e8????????           |                     
            //   488b4d87             | push                esi
            //   4885c9               | inc                 ecx
            //   7411                 | push                edi

        $sequence_1 = { 8bf0 488b8118040000 488bcf ff15???????? 488b0f 488b81e0020000 488bcf }
            // n = 7, score = 100
            //   8bf0                 | mov                 ecx, esi
            //   488b8118040000       | dec                 eax
            //   488bcf               | add                 eax, 0x10
            //   ff15????????         |                     
            //   488b0f               | je                  0x1a40
            //   488b81e0020000       | dec                 eax
            //   488bcf               | test                eax, eax

        $sequence_2 = { e9???????? 4883ec28 33d2 488d0d176b2800 e8???????? 8325????????00 488d0584721d00 }
            // n = 7, score = 100
            //   e9????????           |                     
            //   4883ec28             | ret                 
            //   33d2                 | dec                 eax
            //   488d0d176b2800       | mov                 eax, esp
            //   e8????????           |                     
            //   8325????????00       |                     
            //   488d0584721d00       | push                edi

        $sequence_3 = { e8???????? 90 4533e4 4885f6 7466 4d85f6 7461 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   90                   | inc                 ecx
            //   4533e4               | cmp                 eax, esi
            //   4885f6               | cmovl               ecx, eax
            //   7466                 | mov                 dword ptr [edi + 0x118], ecx
            //   4d85f6               | mov                 eax, dword ptr [edi + 0x114]
            //   7461                 | sub                 eax, dword ptr [edi + 0x10c]

        $sequence_4 = { ff15???????? 90 e8???????? 488b4808 e8???????? 90 488b07 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   90                   | dec                 eax
            //   e8????????           |                     
            //   488b4808             | lea                 edx, [0x8d998]
            //   e8????????           |                     
            //   90                   | dec                 eax
            //   488b07               | mov                 ecx, ebx

        $sequence_5 = { c3 4053 55 56 57 4883ec38 498b01 }
            // n = 7, score = 100
            //   c3                   | mov                 dword ptr [ebp - 0x2d], eax
            //   4053                 | mov                 eax, ecx
            //   55                   | mov                 dword ptr [ebp - 0x1d], eax
            //   56                   | mov                 dword ptr [ebp - 0xd], eax
            //   57                   | sub                 ecx, edi
            //   4883ec38             | mov                 eax, dword ptr [esp + 0x40]
            //   498b01               | sub                 ecx, eax

        $sequence_6 = { d1f8 4c8d542430 4863c8 4c8d1d80c01b00 480fafca 4803d2 4d8d144a }
            // n = 7, score = 100
            //   d1f8                 | mov                 ecx, esi
            //   4c8d542430           | dec                 eax
            //   4863c8               | mov                 ecx, dword ptr [ebx + 0x17f8]
            //   4c8d1d80c01b00       | mov                 esi, 0x105
            //   480fafca             | inc                 esp
            //   4803d2               | mov                 ecx, esi
            //   4d8d144a             | inc                 ebp

        $sequence_7 = { ffc6 48ffc3 4863c6 488d4afd 483bc1 7cc7 488b5c2430 }
            // n = 7, score = 100
            //   ffc6                 | mov                 ebx, eax
            //   48ffc3               | inc                 ecx
            //   4863c6               | or                  edi, 0xffffffff
            //   488d4afd             | inc                 ebp
            //   483bc1               | cmp                 esp, edi
            //   7cc7                 | jne                 0x34
            //   488b5c2430           | dec                 eax

        $sequence_8 = { ff15???????? 8905???????? 4883c428 c3 4883ec28 ba01000000 488d0dc4682800 }
            // n = 7, score = 100
            //   ff15????????         |                     
            //   8905????????         |                     
            //   4883c428             | dec                 eax
            //   c3                   | test                ecx, ecx
            //   4883ec28             | dec                 eax
            //   ba01000000           | mov                 ecx, eax
            //   488d0dc4682800       | dec                 esp

        $sequence_9 = { e8???????? 488bc3 488b5c2430 4883c420 5f c3 488d0511501800 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   488bc3               | mov                 eax, dword ptr [eax + 0xf0]
            //   488b5c2430           | dec                 eax
            //   4883c420             | mov                 edx, eax
            //   5f                   | dec                 eax
            //   c3                   | lea                 ecx, [0x11d21d]
            //   488d0511501800       | cmp                 eax, edx

    condition:
        7 of them and filesize < 6474752
}