Actor(s): APT28
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 = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8d4afe 89442410 89442414 8954241c 3bf1 0f8379040000 0fb606 } // n = 7, score = 1200 // 8d4afe | lea ecx, [edx - 2] // 89442410 | mov dword ptr [esp + 0x10], eax // 89442414 | mov dword ptr [esp + 0x14], eax // 8954241c | mov dword ptr [esp + 0x1c], edx // 3bf1 | cmp esi, ecx // 0f8379040000 | jae 0x47f // 0fb606 | movzx eax, byte ptr [esi] $sequence_1 = { 8a0b 43 84c9 75f9 2bda 81fbff000000 0f8fb7000000 } // n = 7, score = 1200 // 8a0b | mov cl, byte ptr [ebx] // 43 | inc ebx // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bda | sub ebx, edx // 81fbff000000 | cmp ebx, 0xff // 0f8fb7000000 | jg 0xbd $sequence_2 = { 8a542410 8a442414 8d7702 6a00 } // n = 4, score = 1200 // 8a542410 | mov dl, byte ptr [esp + 0x10] // 8a442414 | mov al, byte ptr [esp + 0x14] // 8d7702 | lea esi, [edi + 2] // 6a00 | push 0 $sequence_3 = { eb6d ba01ff0000 663bda 7522 8b442434 } // n = 5, score = 1200 // eb6d | jmp 0x6f // ba01ff0000 | mov edx, 0xff01 // 663bda | cmp bx, dx // 7522 | jne 0x24 // 8b442434 | mov eax, dword ptr [esp + 0x34] $sequence_4 = { e8???????? 99 b960000000 f7f9 } // n = 4, score = 1200 // e8???????? | // 99 | cdq // b960000000 | mov ecx, 0x60 // f7f9 | idiv ecx $sequence_5 = { 8a0c30 84c9 0f84fc010000 0fb6c9 8d440801 3bc5 } // n = 6, score = 1200 // 8a0c30 | mov cl, byte ptr [eax + esi] // 84c9 | test cl, cl // 0f84fc010000 | je 0x202 // 0fb6c9 | movzx ecx, cl // 8d440801 | lea eax, [eax + ecx + 1] // 3bc5 | cmp eax, ebp $sequence_6 = { 8b11 83c202 52 e8???????? } // n = 4, score = 1200 // 8b11 | mov edx, dword ptr [ecx] // 83c202 | add edx, 2 // 52 | push edx // e8???????? | $sequence_7 = { 8a4c2410 8a542414 8d5f09 880b } // n = 4, score = 1200 // 8a4c2410 | mov cl, byte ptr [esp + 0x10] // 8a542414 | mov dl, byte ptr [esp + 0x14] // 8d5f09 | lea ebx, [edi + 9] // 880b | mov byte ptr [ebx], cl $sequence_8 = { 8a442430 8b4f58 888778010000 83c40c c7811c04000001000000 eb6d ba01ff0000 } // n = 7, score = 1200 // 8a442430 | mov al, byte ptr [esp + 0x30] // 8b4f58 | mov ecx, dword ptr [edi + 0x58] // 888778010000 | mov byte ptr [edi + 0x178], al // 83c40c | add esp, 0xc // c7811c04000001000000 | mov dword ptr [ecx + 0x41c], 1 // eb6d | jmp 0x6f // ba01ff0000 | mov edx, 0xff01 $sequence_9 = { 8b7804 897c241c 0f85b3030000 8b7558 51 e8???????? 8bc8 } // n = 7, score = 1200 // 8b7804 | mov edi, dword ptr [eax + 4] // 897c241c | mov dword ptr [esp + 0x1c], edi // 0f85b3030000 | jne 0x3b9 // 8b7558 | mov esi, dword ptr [ebp + 0x58] // 51 | push ecx // e8???????? | // 8bc8 | mov ecx, eax $sequence_10 = { 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_11 = { 0fb75608 66895008 8b4e18 894818 8b16 8910 } // n = 6, score = 1000 // 0fb75608 | movzx edx, word ptr [esi + 8] // 66895008 | mov word ptr [eax + 8], dx // 8b4e18 | mov ecx, dword ptr [esi + 0x18] // 894818 | mov dword ptr [eax + 0x18], ecx // 8b16 | mov edx, dword ptr [esi] // 8910 | mov dword ptr [eax], edx $sequence_12 = { 83c404 807e1500 8975f0 74de 8b4304 894004 } // n = 6, score = 1000 // 83c404 | add esp, 4 // 807e1500 | cmp byte ptr [esi + 0x15], 0 // 8975f0 | mov dword ptr [ebp - 0x10], esi // 74de | je 0xffffffe0 // 8b4304 | mov eax, dword ptr [ebx + 4] // 894004 | mov dword ptr [eax + 4], eax $sequence_13 = { 83c404 807e1500 8975f0 74dd 8b4744 894004 } // n = 6, score = 1000 // 83c404 | add esp, 4 // 807e1500 | cmp byte ptr [esi + 0x15], 0 // 8975f0 | mov dword ptr [ebp - 0x10], esi // 74dd | je 0xffffffdf // 8b4744 | mov eax, dword ptr [edi + 0x44] // 894004 | mov dword ptr [eax + 4], eax $sequence_14 = { c6411501 895dfc 895e10 895e14 895e18 c645fc01 } // n = 6, score = 1000 // c6411501 | mov byte ptr [ecx + 0x15], 1 // 895dfc | mov dword ptr [ebp - 4], ebx // 895e10 | mov dword ptr [esi + 0x10], ebx // 895e14 | mov dword ptr [esi + 0x14], ebx // 895e18 | mov dword ptr [esi + 0x18], ebx // c645fc01 | mov byte ptr [ebp - 4], 1 $sequence_15 = { c20800 8b45f0 8b4df4 64890d00000000 59 5f 5b } // n = 7, score = 1000 // c20800 | ret 8 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx // 5f | pop edi // 5b | pop ebx $sequence_16 = { 8b4634 894004 8b4634 894008 8b4e34 c6411401 } // n = 6, score = 1000 // 8b4634 | mov eax, dword ptr [esi + 0x34] // 894004 | mov dword ptr [eax + 4], eax // 8b4634 | mov eax, dword ptr [esi + 0x34] // 894008 | mov dword ptr [eax + 8], eax // 8b4e34 | mov ecx, dword ptr [esi + 0x34] // c6411401 | mov byte ptr [ecx + 0x14], 1 $sequence_17 = { 8b5120 895020 8b4910 894810 eb02 33c0 6a0c } // n = 7, score = 1000 // 8b5120 | mov edx, dword ptr [ecx + 0x20] // 895020 | mov dword ptr [eax + 0x20], edx // 8b4910 | mov ecx, dword ptr [ecx + 0x10] // 894810 | mov dword ptr [eax + 0x10], ecx // eb02 | jmp 4 // 33c0 | xor eax, eax // 6a0c | push 0xc $sequence_18 = { 33ff 897e60 8bc6 8b4df4 64890d00000000 59 } // n = 6, score = 1000 // 33ff | xor edi, edi // 897e60 | mov dword ptr [esi + 0x60], edi // 8bc6 | mov eax, esi // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 59 | pop ecx $sequence_19 = { 83c404 8945b0 8b45b4 50 6a00 } // n = 5, score = 500 // 83c404 | add esp, 4 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] // 50 | push eax // 6a00 | push 0 $sequence_20 = { c685c5fafffff2 c685c6faffffb3 c685c7faffff12 c685c8faffffbb } // n = 4, score = 300 // c685c5fafffff2 | mov byte ptr [ebp - 0x53b], 0xf2 // c685c6faffffb3 | mov byte ptr [ebp - 0x53a], 0xb3 // c685c7faffff12 | mov byte ptr [ebp - 0x539], 0x12 // c685c8faffffbb | mov byte ptr [ebp - 0x538], 0xbb $sequence_21 = { c685c5f8ffff80 c685c6f8ffffa4 c685c7f8ffff16 c685c8f8ffff8d } // n = 4, score = 300 // c685c5f8ffff80 | mov byte ptr [ebp - 0x73b], 0x80 // c685c6f8ffffa4 | mov byte ptr [ebp - 0x73a], 0xa4 // c685c7f8ffff16 | mov byte ptr [ebp - 0x739], 0x16 // c685c8f8ffff8d | mov byte ptr [ebp - 0x738], 0x8d $sequence_22 = { c685c5fbffffbb c685c6fbffffe6 c685c7fbffff36 c685c8fbffffd5 } // n = 4, score = 300 // c685c5fbffffbb | mov byte ptr [ebp - 0x43b], 0xbb // c685c6fbffffe6 | mov byte ptr [ebp - 0x43a], 0xe6 // c685c7fbffff36 | mov byte ptr [ebp - 0x439], 0x36 // c685c8fbffffd5 | mov byte ptr [ebp - 0x438], 0xd5 $sequence_23 = { c685c5f9ffff6d c685c6f9ffff81 c685c7f9ffffc2 c685c8f9ffff82 } // n = 4, score = 300 // c685c5f9ffff6d | mov byte ptr [ebp - 0x63b], 0x6d // c685c6f9ffff81 | mov byte ptr [ebp - 0x63a], 0x81 // c685c7f9ffffc2 | mov byte ptr [ebp - 0x639], 0xc2 // c685c8f9ffff82 | mov byte ptr [ebp - 0x638], 0x82 condition: 7 of them and filesize < 4634440 }
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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