rule win_cycbot_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.cycbot."
        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.cycbot"
        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 = { 56 6a01 8d8d34ffffff c645fc01 e8???????? ff15???????? 8b8b9c0e0000 }
            // n = 7, score = 100
            //   56                   | push                esi
            //   6a01                 | push                1
            //   8d8d34ffffff         | lea                 ecx, [ebp - 0xcc]
            //   c645fc01             | mov                 byte ptr [ebp - 4], 1
            //   e8????????           |                     
            //   ff15????????         |                     
            //   8b8b9c0e0000         | mov                 ecx, dword ptr [ebx + 0xe9c]

        $sequence_1 = { 56 e8???????? 8bf8 59 85ff 741b ff75ec }
            // n = 7, score = 100
            //   56                   | push                esi
            //   e8????????           |                     
            //   8bf8                 | mov                 edi, eax
            //   59                   | pop                 ecx
            //   85ff                 | test                edi, edi
            //   741b                 | je                  0x1d
            //   ff75ec               | push                dword ptr [ebp - 0x14]

        $sequence_2 = { be???????? 8d7d98 f3a5 6a0a 59 be???????? 8d7dc4 }
            // n = 7, score = 100
            //   be????????           |                     
            //   8d7d98               | lea                 edi, [ebp - 0x68]
            //   f3a5                 | rep movsd           dword ptr es:[edi], dword ptr [esi]
            //   6a0a                 | push                0xa
            //   59                   | pop                 ecx
            //   be????????           |                     
            //   8d7dc4               | lea                 edi, [ebp - 0x3c]

        $sequence_3 = { 0f84b7000000 0185d8eeffff 03f8 80bde3eeffff00 7571 8b06 68???????? }
            // n = 7, score = 100
            //   0f84b7000000         | je                  0xbd
            //   0185d8eeffff         | add                 dword ptr [ebp - 0x1128], eax
            //   03f8                 | add                 edi, eax
            //   80bde3eeffff00       | cmp                 byte ptr [ebp - 0x111d], 0
            //   7571                 | jne                 0x73
            //   8b06                 | mov                 eax, dword ptr [esi]
            //   68????????           |                     

        $sequence_4 = { 85c0 744a 50 57 ffd6 0fbe05???????? }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   744a                 | je                  0x4c
            //   50                   | push                eax
            //   57                   | push                edi
            //   ffd6                 | call                esi
            //   0fbe05????????       |                     

        $sequence_5 = { 85c0 0f84b1010000 50 8b8540f9ffff e8???????? 8b15???????? }
            // n = 6, score = 100
            //   85c0                 | test                eax, eax
            //   0f84b1010000         | je                  0x1b7
            //   50                   | push                eax
            //   8b8540f9ffff         | mov                 eax, dword ptr [ebp - 0x6c0]
            //   e8????????           |                     
            //   8b15????????         |                     

        $sequence_6 = { 84d2 75f9 2b4514 49 51 8b4d08 8d4c0f01 }
            // n = 7, score = 100
            //   84d2                 | test                dl, dl
            //   75f9                 | jne                 0xfffffffb
            //   2b4514               | sub                 eax, dword ptr [ebp + 0x14]
            //   49                   | dec                 ecx
            //   51                   | push                ecx
            //   8b4d08               | mov                 ecx, dword ptr [ebp + 8]
            //   8d4c0f01             | lea                 ecx, [edi + ecx + 1]

        $sequence_7 = { b8???????? e8???????? 8b4508 8945c4 8b450c 6a0f 8945ec }
            // n = 7, score = 100
            //   b8????????           |                     
            //   e8????????           |                     
            //   8b4508               | mov                 eax, dword ptr [ebp + 8]
            //   8945c4               | mov                 dword ptr [ebp - 0x3c], eax
            //   8b450c               | mov                 eax, dword ptr [ebp + 0xc]
            //   6a0f                 | push                0xf
            //   8945ec               | mov                 dword ptr [ebp - 0x14], eax

        $sequence_8 = { 8d8584fbffff 50 68???????? e8???????? 8bf0 83c414 3bf3 }
            // n = 7, score = 100
            //   8d8584fbffff         | lea                 eax, [ebp - 0x47c]
            //   50                   | push                eax
            //   68????????           |                     
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   83c414               | add                 esp, 0x14
            //   3bf3                 | cmp                 esi, ebx

        $sequence_9 = { 8b85bcfdffff 33ff 47 8985e8feffff 8b4510 899dc8fdffff 89bdccfeffff }
            // n = 7, score = 100
            //   8b85bcfdffff         | mov                 eax, dword ptr [ebp - 0x244]
            //   33ff                 | xor                 edi, edi
            //   47                   | inc                 edi
            //   8985e8feffff         | mov                 dword ptr [ebp - 0x118], eax
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   899dc8fdffff         | mov                 dword ptr [ebp - 0x238], ebx
            //   89bdccfeffff         | mov                 dword ptr [ebp - 0x134], edi

    condition:
        7 of them and filesize < 1163264
}

rule win_cycbot_w0 {

    meta:
        author = "anonymous"
        date = "2020-11-06"
        description = "Captures characteristic strings of CycBot."
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.cycbot"
        malpedia_rule_date = "20201106"
        malpedia_hash = ""
        malpedia_version = "20201106"
        malpedia_license = "CC BY-SA 4.0"
        malpedia_sharing = "TLP:WHITE"

  strings:
      $net_1 = "t=t&hrs=%d&q=id=1000&ver=%s&s=%d"
      $net_2 = "&system=%d&id=%s&hwid=%s&search=%s"
      $net_3 = "http://%s/s.php?c=121&id=%s"
      $net_4 = "pmv=2&id=%s&hwid=%s"
      $net_5 = "t=%s&p4=0&q=%s&z22=0&s=%d&hrs=%d"
      $s_1 = "SELECT_RESERV_SRV_%d"
      $s_2 = "_PRM_NAME_TASK_LOADER_5"
      $s_3 = "LST_TM_OF_PNG"
      $mutex_1 = "4A3282FEF482C0F79E1"
      $mutex_2 = "{0ECE180F-6E9E-4FA6-A154-6876D9DB8906}"
      $mutex_3 = "{C66E79CE-8935-4ed9-A6B1-4983619CB925}"
      $mutex_4 = "{35BCA615-C82A-4152-8857-BCC626AE4C8D}"

  condition:
      (uint16(0) == 0x5A4D and uint32(uint32(0x3C)) == 0x00004550) and 5 of them
}