rule win_jolob_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.jolob."
        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.jolob"
        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 = { 57 33ff 3bfa 1bdb f7db 03d8 0fafd9 }
            // n = 7, score = 300
            //   57                   | push                edi
            //   33ff                 | xor                 edi, edi
            //   3bfa                 | cmp                 edi, edx
            //   1bdb                 | sbb                 ebx, ebx
            //   f7db                 | neg                 ebx
            //   03d8                 | add                 ebx, eax
            //   0fafd9               | imul                ebx, ecx

        $sequence_1 = { 7407 48 c6043000 75f9 }
            // n = 4, score = 300
            //   7407                 | je                  9
            //   48                   | dec                 eax
            //   c6043000             | mov                 byte ptr [eax + esi], 0
            //   75f9                 | jne                 0xfffffffb

        $sequence_2 = { 8bf8 8bc1 8d5001 8a18 40 84db 75f9 }
            // n = 7, score = 300
            //   8bf8                 | mov                 edi, eax
            //   8bc1                 | mov                 eax, ecx
            //   8d5001               | lea                 edx, [eax + 1]
            //   8a18                 | mov                 bl, byte ptr [eax]
            //   40                   | inc                 eax
            //   84db                 | test                bl, bl
            //   75f9                 | jne                 0xfffffffb

        $sequence_3 = { 394808 7510 8b500c 3b570c }
            // n = 4, score = 300
            //   394808               | cmp                 dword ptr [eax + 8], ecx
            //   7510                 | jne                 0x12
            //   8b500c               | mov                 edx, dword ptr [eax + 0xc]
            //   3b570c               | cmp                 edx, dword ptr [edi + 0xc]

        $sequence_4 = { 57 7516 833d????????00 750d }
            // n = 4, score = 300
            //   57                   | push                edi
            //   7516                 | jne                 0x18
            //   833d????????00       |                     
            //   750d                 | jne                 0xf

        $sequence_5 = { 57 ff15???????? 85db 7419 8b4508 }
            // n = 5, score = 300
            //   57                   | push                edi
            //   ff15????????         |                     
            //   85db                 | test                ebx, ebx
            //   7419                 | je                  0x1b
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]

        $sequence_6 = { 394314 7707 8bf3 e8???????? 8b4318 03431c 8b4b14 }
            // n = 7, score = 300
            //   394314               | cmp                 dword ptr [ebx + 0x14], eax
            //   7707                 | ja                  9
            //   8bf3                 | mov                 esi, ebx
            //   e8????????           |                     
            //   8b4318               | mov                 eax, dword ptr [ebx + 0x18]
            //   03431c               | add                 eax, dword ptr [ebx + 0x1c]
            //   8b4b14               | mov                 ecx, dword ptr [ebx + 0x14]

        $sequence_7 = { 5d c20400 55 8bec 83ec14 833eff }
            // n = 6, score = 300
            //   5d                   | pop                 ebp
            //   c20400               | ret                 4
            //   55                   | push                ebp
            //   8bec                 | mov                 ebp, esp
            //   83ec14               | sub                 esp, 0x14
            //   833eff               | cmp                 dword ptr [esi], -1

        $sequence_8 = { 8bc6 5e c20400 832700 85f6 7410 8b4618 }
            // n = 7, score = 300
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   c20400               | ret                 4
            //   832700               | and                 dword ptr [edi], 0
            //   85f6                 | test                esi, esi
            //   7410                 | je                  0x12
            //   8b4618               | mov                 eax, dword ptr [esi + 0x18]

        $sequence_9 = { 8b4704 8945f8 8b07 0fb74814 8d740118 33c9 663b4806 }
            // n = 7, score = 300
            //   8b4704               | mov                 eax, dword ptr [edi + 4]
            //   8945f8               | mov                 dword ptr [ebp - 8], eax
            //   8b07                 | mov                 eax, dword ptr [edi]
            //   0fb74814             | movzx               ecx, word ptr [eax + 0x14]
            //   8d740118             | lea                 esi, [ecx + eax + 0x18]
            //   33c9                 | xor                 ecx, ecx
            //   663b4806             | cmp                 cx, word ptr [eax + 6]

    condition:
        7 of them and filesize < 196608
}