rule win_silentgh0st_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-09-17"
        version = "1"
        description = "Detects win.silentgh0st."
        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.silentgh0st"
        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 = { c3 53 56 83f904 7416 68b2060000 68???????? }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   53                   | push                ebx
            //   56                   | push                esi
            //   83f904               | cmp                 ecx, 4
            //   7416                 | je                  0x18
            //   68b2060000           | push                0x6b2
            //   68????????           |                     

        $sequence_1 = { e8???????? 8bf0 85f6 7524 686d020000 68???????? }
            // n = 6, score = 100
            //   e8????????           |                     
            //   8bf0                 | mov                 esi, eax
            //   85f6                 | test                esi, esi
            //   7524                 | jne                 0x26
            //   686d020000           | push                0x26d
            //   68????????           |                     

        $sequence_2 = { e8???????? 6a09 56 e8???????? 83c414 e9???????? 3bd3 }
            // n = 7, score = 100
            //   e8????????           |                     
            //   6a09                 | push                9
            //   56                   | push                esi
            //   e8????????           |                     
            //   83c414               | add                 esp, 0x14
            //   e9????????           |                     
            //   3bd3                 | cmp                 edx, ebx

        $sequence_3 = { c745e80f000000 895de4 885dd4 895dfc be???????? 395ef4 7438 }
            // n = 7, score = 100
            //   c745e80f000000       | mov                 dword ptr [ebp - 0x18], 0xf
            //   895de4               | mov                 dword ptr [ebp - 0x1c], ebx
            //   885dd4               | mov                 byte ptr [ebp - 0x2c], bl
            //   895dfc               | mov                 dword ptr [ebp - 4], ebx
            //   be????????           |                     
            //   395ef4               | cmp                 dword ptr [esi - 0xc], ebx
            //   7438                 | je                  0x3a

        $sequence_4 = { e8???????? 83c40c 8b868c000000 3bc3 741b 50 e8???????? }
            // n = 7, score = 100
            //   e8????????           |                     
            //   83c40c               | add                 esp, 0xc
            //   8b868c000000         | mov                 eax, dword ptr [esi + 0x8c]
            //   3bc3                 | cmp                 eax, ebx
            //   741b                 | je                  0x1d
            //   50                   | push                eax
            //   e8????????           |                     

        $sequence_5 = { 83c040 50 e8???????? 83c410 33d2 8b4510 897708 }
            // n = 7, score = 100
            //   83c040               | add                 eax, 0x40
            //   50                   | push                eax
            //   e8????????           |                     
            //   83c410               | add                 esp, 0x10
            //   33d2                 | xor                 edx, edx
            //   8b4510               | mov                 eax, dword ptr [ebp + 0x10]
            //   897708               | mov                 dword ptr [edi + 8], esi

        $sequence_6 = { 55 8b6c2408 3b6e08 7f04 8bc6 eb0a 55 }
            // n = 7, score = 100
            //   55                   | push                ebp
            //   8b6c2408             | mov                 ebp, dword ptr [esp + 8]
            //   3b6e08               | cmp                 ebp, dword ptr [esi + 8]
            //   7f04                 | jg                  6
            //   8bc6                 | mov                 eax, esi
            //   eb0a                 | jmp                 0xc
            //   55                   | push                ebp

        $sequence_7 = { 40 41 3bc7 7ce3 55 8b6c2410 56 }
            // n = 7, score = 100
            //   40                   | inc                 eax
            //   41                   | inc                 ecx
            //   3bc7                 | cmp                 eax, edi
            //   7ce3                 | jl                  0xffffffe5
            //   55                   | push                ebp
            //   8b6c2410             | mov                 ebp, dword ptr [esp + 0x10]
            //   56                   | push                esi

        $sequence_8 = { 5e 5f 33c0 5b c3 55 8d6f1c }
            // n = 7, score = 100
            //   5e                   | pop                 esi
            //   5f                   | pop                 edi
            //   33c0                 | xor                 eax, eax
            //   5b                   | pop                 ebx
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   8d6f1c               | lea                 ebp, [edi + 0x1c]

        $sequence_9 = { c3 5d b801000000 5e 59 c3 55 }
            // n = 7, score = 100
            //   c3                   | ret                 
            //   5d                   | pop                 ebp
            //   b801000000           | mov                 eax, 1
            //   5e                   | pop                 esi
            //   59                   | pop                 ecx
            //   c3                   | ret                 
            //   55                   | push                ebp

    condition:
        7 of them and filesize < 2065408
}