rule win_hesperbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.hesperbot."
        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.hesperbot"
        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 = { 0f84e2000000 8bce e8???????? 8b4d10 }
            // n = 4, score = 500
            //   0f84e2000000         | je                  0xe8
            //   8bce                 | mov                 ecx, esi
            //   e8????????           |                     
            //   8b4d10               | mov                 ecx, dword ptr [ebp + 0x10]

        $sequence_1 = { 8d4610 50 8d4608 50 56 ff15???????? 50 }
            // n = 7, score = 500
            //   8d4610               | lea                 eax, [esi + 0x10]
            //   50                   | push                eax
            //   8d4608               | lea                 eax, [esi + 8]
            //   50                   | push                eax
            //   56                   | push                esi
            //   ff15????????         |                     
            //   50                   | push                eax

        $sequence_2 = { 77ec eb04 8d744102 8bc6 5e c3 6a00 }
            // n = 7, score = 500
            //   77ec                 | ja                  0xffffffee
            //   eb04                 | jmp                 6
            //   8d744102             | lea                 esi, [ecx + eax*2 + 2]
            //   8bc6                 | mov                 eax, esi
            //   5e                   | pop                 esi
            //   c3                   | ret                 
            //   6a00                 | push                0

        $sequence_3 = { 75f8 8d45e0 50 e8???????? e8???????? 8945ef }
            // n = 6, score = 500
            //   75f8                 | jne                 0xfffffffa
            //   8d45e0               | lea                 eax, [ebp - 0x20]
            //   50                   | push                eax
            //   e8????????           |                     
            //   e8????????           |                     
            //   8945ef               | mov                 dword ptr [ebp - 0x11], eax

        $sequence_4 = { 85ff 742b 6a20 58 48 c6043800 75f9 }
            // n = 7, score = 500
            //   85ff                 | test                edi, edi
            //   742b                 | je                  0x2d
            //   6a20                 | push                0x20
            //   58                   | pop                 eax
            //   48                   | dec                 eax
            //   c6043800             | mov                 byte ptr [eax + edi], 0
            //   75f9                 | jne                 0xfffffffb

        $sequence_5 = { 7414 8b450c 894710 8b4510 33db 894714 43 }
            // n = 7, score = 500
            //   7414                 | je                  0x16
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   894710               | mov                 dword ptr [edi + 0x10], eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   33db                 | xor                 ebx, ebx
            //   894714               | mov                 dword ptr [edi + 0x14], eax
            //   43                   | inc                 ebx

        $sequence_6 = { 33f6 46 8937 c7470466864173 c7470867864173 89770c e8???????? }
            // n = 7, score = 500
            //   33f6                 | xor                 esi, esi
            //   46                   | inc                 esi
            //   8937                 | mov                 dword ptr [edi], esi
            //   c7470466864173       | mov                 dword ptr [edi + 4], 0x73418666
            //   c7470867864173       | mov                 dword ptr [edi + 8], 0x73418667
            //   89770c               | mov                 dword ptr [edi + 0xc], esi
            //   e8????????           |                     

        $sequence_7 = { 8a45fe 8a5dff 2403 004109 7418 2a5508 800940 }
            // n = 7, score = 500
            //   8a45fe               | mov                 al, byte ptr [ebp - 2]
            //   8a5dff               | mov                 bl, byte ptr [ebp - 1]
            //   2403                 | and                 al, 3
            //   004109               | add                 byte ptr [ecx + 9], al
            //   7418                 | je                  0x1a
            //   2a5508               | sub                 dl, byte ptr [ebp + 8]
            //   800940               | or                  byte ptr [ecx], 0x40

        $sequence_8 = { 33f6 56 8d45f8 50 8d45f4 50 ff7508 }
            // n = 7, score = 500
            //   33f6                 | xor                 esi, esi
            //   56                   | push                esi
            //   8d45f8               | lea                 eax, [ebp - 8]
            //   50                   | push                eax
            //   8d45f4               | lea                 eax, [ebp - 0xc]
            //   50                   | push                eax
            //   ff7508               | push                dword ptr [ebp + 8]

        $sequence_9 = { 13f7 034c2458 1374245c 8344241440 894c2418 8974241c }
            // n = 6, score = 500
            //   13f7                 | adc                 esi, edi
            //   034c2458             | add                 ecx, dword ptr [esp + 0x58]
            //   1374245c             | adc                 esi, dword ptr [esp + 0x5c]
            //   8344241440           | add                 dword ptr [esp + 0x14], 0x40
            //   894c2418             | mov                 dword ptr [esp + 0x18], ecx
            //   8974241c             | mov                 dword ptr [esp + 0x1c], esi

    condition:
        7 of them and filesize < 188416
}