rule win_ghole_auto {

    meta:
        author = "Felix Bilstein - yara-signator at cocacoding dot com"
        date = "2026-05-04"
        version = "1"
        description = "Detects win.ghole."
        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.ghole"
        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 = { 89c7 e8???????? 85c0 0f8484000000 48 8d8520fdffff }
            // n = 6, score = 100
            //   89c7                 | mov                 edi, eax
            //   e8????????           |                     
            //   85c0                 | test                eax, eax
            //   0f8484000000         | je                  0x8a
            //   48                   | dec                 eax
            //   8d8520fdffff         | lea                 eax, [ebp - 0x2e0]

        $sequence_1 = { 48 8b45e0 48 89de 48 89c7 e8???????? }
            // n = 7, score = 100
            //   48                   | dec                 eax
            //   8b45e0               | mov                 eax, dword ptr [ebp - 0x20]
            //   48                   | dec                 eax
            //   89de                 | mov                 esi, ebx
            //   48                   | dec                 eax
            //   89c7                 | mov                 edi, eax
            //   e8????????           |                     

        $sequence_2 = { 8b8568feffff 48 8945e8 eb17 48 8b45e8 0fb600 }
            // n = 7, score = 100
            //   8b8568feffff         | mov                 eax, dword ptr [ebp - 0x198]
            //   48                   | dec                 eax
            //   8945e8               | mov                 dword ptr [ebp - 0x18], eax
            //   eb17                 | jmp                 0x19
            //   48                   | dec                 eax
            //   8b45e8               | mov                 eax, dword ptr [ebp - 0x18]
            //   0fb600               | movzx               eax, byte ptr [eax]

        $sequence_3 = { 8b45f8 48 8b55f0 48 8910 48 8b45f8 }
            // n = 7, score = 100
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   48                   | dec                 eax
            //   8b55f0               | mov                 edx, dword ptr [ebp - 0x10]
            //   48                   | dec                 eax
            //   8910                 | mov                 dword ptr [eax], edx
            //   48                   | dec                 eax
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]

        $sequence_4 = { 25ff000000 89c2 48 8d05b37c0000 0fb60402 0fb6c0 c1e008 }
            // n = 7, score = 100
            //   25ff000000           | and                 eax, 0xff
            //   89c2                 | mov                 edx, eax
            //   48                   | dec                 eax
            //   8d05b37c0000         | lea                 eax, [0x7cb3]
            //   0fb60402             | movzx               eax, byte ptr [edx + eax]
            //   0fb6c0               | movzx               eax, al
            //   c1e008               | shl                 eax, 8

        $sequence_5 = { 0f94c0 0fb6c0 c9 c3 55 48 89e5 }
            // n = 7, score = 100
            //   0f94c0               | sete                al
            //   0fb6c0               | movzx               eax, al
            //   c9                   | leave               
            //   c3                   | ret                 
            //   55                   | push                ebp
            //   48                   | dec                 eax
            //   89e5                 | mov                 ebp, esp

        $sequence_6 = { 8b855cffffff 83c801 89855cffffff 66c78560ffffff0000 48 8b05???????? }
            // n = 6, score = 100
            //   8b855cffffff         | mov                 eax, dword ptr [ebp - 0xa4]
            //   83c801               | or                  eax, 1
            //   89855cffffff         | mov                 dword ptr [ebp - 0xa4], eax
            //   66c78560ffffff0000     | mov    word ptr [ebp - 0xa0], 0
            //   48                   | dec                 eax
            //   8b05????????         |                     

        $sequence_7 = { 8b45f8 48 8b4038 48 85c0 7429 48 }
            // n = 7, score = 100
            //   8b45f8               | mov                 eax, dword ptr [ebp - 8]
            //   48                   | dec                 eax
            //   8b4038               | mov                 eax, dword ptr [eax + 0x38]
            //   48                   | dec                 eax
            //   85c0                 | test                eax, eax
            //   7429                 | je                  0x2b
            //   48                   | dec                 eax

        $sequence_8 = { 2500ff0000 31c1 8b45ec 25ff000000 89c0 48 8d148500000000 }
            // n = 7, score = 100
            //   2500ff0000           | and                 eax, 0xff00
            //   31c1                 | xor                 ecx, eax
            //   8b45ec               | mov                 eax, dword ptr [ebp - 0x14]
            //   25ff000000           | and                 eax, 0xff
            //   89c0                 | mov                 eax, eax
            //   48                   | dec                 eax
            //   8d148500000000       | lea                 edx, [eax*4]

        $sequence_9 = { 89e0 48 83c00f 48 c1e804 48 c1e004 }
            // n = 7, score = 100
            //   89e0                 | mov                 eax, esp
            //   48                   | dec                 eax
            //   83c00f               | add                 eax, 0xf
            //   48                   | dec                 eax
            //   c1e804               | shr                 eax, 4
            //   48                   | dec                 eax
            //   c1e004               | shl                 eax, 4

    condition:
        7 of them and filesize < 622592
}

rule win_ghole_w0 {
	meta:
		description = "Detects a operation Woolen-Goldfish sample - http://goo.gl/NpJpVZ"
		author = "Florian Roth"
		reference = "http://goo.gl/NpJpVZ"
		date = "2015/03/25"
		score = 90
		hash = "86222ef166474e53f1eb6d7e6701713834e6fee7"
		hash = "e8dbcde49c7f760165ebb0cb3452e4f1c24981f5"
		source = "https://github.com/mattulm/sfiles_yara/blob/master/malware/WoolenGoldfish.yar"
        malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ghole"
        malpedia_version = "20170517"
        malpedia_license = "CC BY-NC-SA 4.0"
        malpedia_sharing = "TLP:WHITE"
	strings:
		$x1 = "... get header FATAL ERROR !!!  %d bytes read > header_size" fullword ascii
		$x2 = "index.php?c=%S&r=%x&u=1&t=%S" fullword wide
		$x3 = "connect_back_tcp_channel#do_connect:: Error resolving connect back hostname" fullword ascii

		$s0 = "kernel32.dll GetProcAddressLoadLibraryAws2_32.dll" fullword ascii
		$s1 = "Content-Type: multipart/form-data; boundary=%S" fullword wide
		$s2 = "Attempting to unlock uninitialized lock!" fullword ascii
		$s4 = "unable to load kernel32.dll" fullword ascii
		$s5 = "index.php?c=%S&r=%x" fullword wide
		$s6 = "%s len:%d " fullword ascii
		$s7 = "Encountered error sending syscall response to client" fullword ascii
		$s9 = "/info.dat" fullword ascii
		$s10 = "Error entering thread lock" fullword ascii
		$s11 = "Error exiting thread lock" fullword ascii
		$s12 = "connect_back_tcp_channel_init:: socket() failed" fullword ascii
	condition:
		( 1 of ($x*) ) or
		( 8 of ($s*) )
}