Actor(s): Sofacy
X-Tunnel is a network proxy tool that implements a custom network protocol encapsulated in the TLS protocol.
rule win_xtunnel_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.xtunnel." 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.xtunnel" malpedia_rule_date = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 8b11 83c202 52 e8???????? } // n = 4, score = 1200 // 8b11 | mov edx, dword ptr [ecx] // 83c202 | add edx, 2 // 52 | push edx // e8???????? | $sequence_1 = { e8???????? 99 b960000000 f7f9 } // n = 4, score = 1200 // e8???????? | // 99 | cdq // b960000000 | mov ecx, 0x60 // f7f9 | idiv ecx $sequence_2 = { 8b5658 39aa20010000 7468 813efffe0000 } // n = 4, score = 1100 // 8b5658 | mov edx, dword ptr [esi + 0x58] // 39aa20010000 | cmp dword ptr [edx + 0x120], ebp // 7468 | je 0x6a // 813efffe0000 | cmp dword ptr [esi], 0xfeff $sequence_3 = { c7010c000000 5e 5d c3 6a00 } // n = 5, score = 1100 // c7010c000000 | mov dword ptr [ecx], 0xc // 5e | pop esi // 5d | pop ebp // c3 | ret // 6a00 | push 0 $sequence_4 = { 8b4c2420 8b5638 55 51 } // n = 4, score = 1100 // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 8b5638 | mov edx, dword ptr [esi + 0x38] // 55 | push ebp // 51 | push ecx $sequence_5 = { 8b5658 89ba74030000 8b4e58 898178030000 } // n = 4, score = 1100 // 8b5658 | mov edx, dword ptr [esi + 0x58] // 89ba74030000 | mov dword ptr [edx + 0x374], edi // 8b4e58 | mov ecx, dword ptr [esi + 0x58] // 898178030000 | mov dword ptr [ecx + 0x378], eax $sequence_6 = { 8b5658 898268010000 8b7e58 8b542430 } // n = 4, score = 1100 // 8b5658 | mov edx, dword ptr [esi + 0x58] // 898268010000 | mov dword ptr [edx + 0x168], eax // 8b7e58 | mov edi, dword ptr [esi + 0x58] // 8b542430 | mov edx, dword ptr [esp + 0x30] $sequence_7 = { 8b4c2420 8b542424 56 50 51 8b4c2434 } // n = 6, score = 1100 // 8b4c2420 | mov ecx, dword ptr [esp + 0x20] // 8b542424 | mov edx, dword ptr [esp + 0x24] // 56 | push esi // 50 | push eax // 51 | push ecx // 8b4c2434 | mov ecx, dword ptr [esp + 0x34] $sequence_8 = { 8b542434 8b74243c 8b5c2414 52 } // n = 4, score = 1100 // 8b542434 | mov edx, dword ptr [esp + 0x34] // 8b74243c | mov esi, dword ptr [esp + 0x3c] // 8b5c2414 | mov ebx, dword ptr [esp + 0x14] // 52 | push edx $sequence_9 = { 8b5654 51 33db 52 894e60 897c2428 } // n = 6, score = 1100 // 8b5654 | mov edx, dword ptr [esi + 0x54] // 51 | push ecx // 33db | xor ebx, ebx // 52 | push edx // 894e60 | mov dword ptr [esi + 0x60], ecx // 897c2428 | mov dword ptr [esp + 0x28], edi $sequence_10 = { 8b5658 56 89aa80010000 e8???????? 83c404 85c0 0f85effbffff } // n = 7, score = 1100 // 8b5658 | mov edx, dword ptr [esi + 0x58] // 56 | push esi // 89aa80010000 | mov dword ptr [edx + 0x180], ebp // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 0f85effbffff | jne 0xfffffbf5 $sequence_11 = { 50 ff15???????? 8b4b10 0fb71479 8b4b04 } // n = 5, score = 1000 // 50 | push eax // ff15???????? | // 8b4b10 | mov ecx, dword ptr [ebx + 0x10] // 0fb71479 | movzx edx, word ptr [ecx + edi*2] // 8b4b04 | mov ecx, dword ptr [ebx + 4] $sequence_12 = { 740a 8b450c e8???????? 8bd8 8b7d08 0fb7f6 c745fcffffffff } // n = 7, score = 1000 // 740a | je 0xc // 8b450c | mov eax, dword ptr [ebp + 0xc] // e8???????? | // 8bd8 | mov ebx, eax // 8b7d08 | mov edi, dword ptr [ebp + 8] // 0fb7f6 | movzx esi, si // c745fcffffffff | mov dword ptr [ebp - 4], 0xffffffff $sequence_13 = { 7409 50 e8???????? 83c404 897710 897714 897718 } // n = 7, score = 1000 // 7409 | je 0xb // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 897710 | mov dword ptr [edi + 0x10], esi // 897714 | mov dword ptr [edi + 0x14], esi // 897718 | mov dword ptr [edi + 0x18], esi $sequence_14 = { 53 e8???????? 8d5f30 83c404 } // n = 4, score = 1000 // 53 | push ebx // e8???????? | // 8d5f30 | lea ebx, dword ptr [edi + 0x30] // 83c404 | add esp, 4 $sequence_15 = { 895f04 895f08 895f0c 895f10 c645fc06 } // n = 5, score = 1000 // 895f04 | mov dword ptr [edi + 4], ebx // 895f08 | mov dword ptr [edi + 8], ebx // 895f0c | mov dword ptr [edi + 0xc], ebx // 895f10 | mov dword ptr [edi + 0x10], ebx // c645fc06 | mov byte ptr [ebp - 4], 6 $sequence_16 = { 5b 8be5 5d c20800 8b45f0 8b4df4 } // n = 6, score = 1000 // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c20800 | ret 8 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_17 = { 8d4750 8d550c 89750c e8???????? 8918 } // n = 5, score = 1000 // 8d4750 | lea eax, dword ptr [edi + 0x50] // 8d550c | lea edx, dword ptr [ebp + 0xc] // 89750c | mov dword ptr [ebp + 0xc], esi // e8???????? | // 8918 | mov dword ptr [eax], ebx $sequence_18 = { 83c404 895dec c645fc0b 8b4304 8b08 } // n = 5, score = 1000 // 83c404 | add esp, 4 // 895dec | mov dword ptr [ebp - 0x14], ebx // c645fc0b | mov byte ptr [ebp - 4], 0xb // 8b4304 | mov eax, dword ptr [ebx + 4] // 8b08 | mov ecx, dword ptr [eax] $sequence_19 = { 8945b0 8b45b4 50 6a00 } // n = 4, score = 400 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] // 50 | push eax // 6a00 | push 0 $sequence_20 = { e8???????? 83c404 8945b0 8b45b4 } // n = 4, score = 400 // e8???????? | // 83c404 | add esp, 4 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] $sequence_21 = { c685c4f9ffffa8 c685c5f9ffff6d c685c6f9ffff81 c685c7f9ffffc2 } // n = 4, score = 300 // c685c4f9ffffa8 | mov byte ptr [ebp - 0x63c], 0xa8 // c685c5f9ffff6d | mov byte ptr [ebp - 0x63b], 0x6d // c685c6f9ffff81 | mov byte ptr [ebp - 0x63a], 0x81 // c685c7f9ffffc2 | mov byte ptr [ebp - 0x639], 0xc2 $sequence_22 = { c685c4fbffff04 c685c5fbffffbb c685c6fbffffe6 c685c7fbffff36 } // n = 4, score = 300 // c685c4fbffff04 | mov byte ptr [ebp - 0x43c], 4 // c685c5fbffffbb | mov byte ptr [ebp - 0x43b], 0xbb // c685c6fbffffe6 | mov byte ptr [ebp - 0x43a], 0xe6 // c685c7fbffff36 | mov byte ptr [ebp - 0x439], 0x36 $sequence_23 = { c685c4faffffea c685c5fafffff2 c685c6faffffb3 c685c7faffff12 } // n = 4, score = 300 // c685c4faffffea | mov byte ptr [ebp - 0x53c], 0xea // c685c5fafffff2 | mov byte ptr [ebp - 0x53b], 0xf2 // c685c6faffffb3 | mov byte ptr [ebp - 0x53a], 0xb3 // c685c7faffff12 | mov byte ptr [ebp - 0x539], 0x12 condition: 7 of them and filesize < 4325376 }
rule win_xtunnel_w0 { meta: author = "Claudio Guarnieri" source = "https://netzpolitik.org/2015/digital-attack-on-german-parliament-investigative-report-on-the-hack-of-the-left-party-infrastructure-in-bundestag/" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.xtunnel" malpedia_version = "20170410" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $xaps = ":\\PROJECT\\XAPS_" $variant11 = "XAPS_OBJECTIVE.dll" $variant12 = "start" $variant21 = "User-Agent: Mozilla/5.0 (Windows NT 6.3;WOW64; rv:28.0) Gecko/20100101 Firefox/28.0" $variant22 = "is you live?" $mix1 = "176.31.112.10" $mix2 = "error in select, errno %d" $mix3 = "no msg" $mix4 = "is you live?" $mix5 = "127.0.0.1" $mix6 = "err %d" $mix7 = "i`m wait" $mix8 = "hello" $mix9 = "OpenSSL 1.0.1e 11 Feb 2013" $mix10 = "Xtunnel.exe" condition: ((uint16(0) == 0x5A4D) or (uint16(0) == 0xCFD0)) and (($xaps) or (all of ($variant1*)) or (all of ($variant2*)) or (6 of ($mix*))) }
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