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 = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8b54241c 8b742418 8d42fc 3bf0 0f86f9fcffff 3bf2 } // n = 6, score = 1200 // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 8b742418 | mov esi, dword ptr [esp + 0x18] // 8d42fc | lea eax, [edx - 4] // 3bf0 | cmp esi, eax // 0f86f9fcffff | jbe 0xfffffcff // 3bf2 | cmp esi, edx $sequence_1 = { 8a542410 8a442414 8d7702 6a00 8d7e09 } // n = 5, score = 1200 // 8a542410 | mov dl, byte ptr [esp + 0x10] // 8a442414 | mov al, byte ptr [esp + 0x14] // 8d7702 | lea esi, [edi + 2] // 6a00 | push 0 // 8d7e09 | lea edi, [esi + 9] $sequence_2 = { 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_3 = { 8b11 83c202 52 e8???????? } // n = 4, score = 1200 // 8b11 | mov edx, dword ptr [ecx] // 83c202 | add edx, 2 // 52 | push edx // e8???????? | $sequence_4 = { 8a0c30 84c9 0f84fc010000 0fb6c9 } // n = 4, score = 1200 // 8a0c30 | mov cl, byte ptr [eax + esi] // 84c9 | test cl, cl // 0f84fc010000 | je 0x202 // 0fb6c9 | movzx ecx, cl $sequence_5 = { 8a0b 43 84c9 75f9 2bde 3bda 0f87e8070000 } // n = 7, score = 1200 // 8a0b | mov cl, byte ptr [ebx] // 43 | inc ebx // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bde | sub ebx, esi // 3bda | cmp ebx, edx // 0f87e8070000 | ja 0x7ee $sequence_6 = { e8???????? 99 b960000000 f7f9 } // n = 4, score = 1200 // e8???????? | // 99 | cdq // b960000000 | mov ecx, 0x60 // f7f9 | idiv ecx $sequence_7 = { 8d84248c000000 50 55 c60730 c7442430ff000000 e8???????? } // n = 6, score = 1200 // 8d84248c000000 | lea eax, [esp + 0x8c] // 50 | push eax // 55 | push ebp // c60730 | mov byte ptr [edi], 0x30 // c7442430ff000000 | mov dword ptr [esp + 0x30], 0xff // e8???????? | $sequence_8 = { 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_9 = { 8a4c2410 8a542414 8d5f09 880b 885301 8b7558 68???????? } // n = 7, 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 // 885301 | mov byte ptr [ebx + 1], dl // 8b7558 | mov esi, dword ptr [ebp + 0x58] // 68???????? | $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 = { 8b02 83c002 895f04 895f08 } // n = 4, score = 1000 // 8b02 | mov eax, dword ptr [edx] // 83c002 | add eax, 2 // 895f04 | mov dword ptr [edi + 4], ebx // 895f08 | mov dword ptr [edi + 8], ebx $sequence_12 = { 8b5620 895020 8b4e10 894810 eb02 33c0 } // n = 6, score = 1000 // 8b5620 | mov edx, dword ptr [esi + 0x20] // 895020 | mov dword ptr [eax + 0x20], edx // 8b4e10 | mov ecx, dword ptr [esi + 0x10] // 894810 | mov dword ptr [eax + 0x10], ecx // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_13 = { 894818 8b16 8910 8b4e14 } // n = 4, score = 1000 // 894818 | mov dword ptr [eax + 0x18], ecx // 8b16 | mov edx, dword ptr [esi] // 8910 | mov dword ptr [eax], edx // 8b4e14 | mov ecx, dword ptr [esi + 0x14] $sequence_14 = { e8???????? 8bf8 83c404 897dec 33db } // n = 5, score = 1000 // e8???????? | // 8bf8 | mov edi, eax // 83c404 | add esp, 4 // 897dec | mov dword ptr [ebp - 0x14], edi // 33db | xor ebx, ebx $sequence_15 = { 895e18 c645fc01 6a18 895e28 e8???????? 83c404 } // n = 6, score = 1000 // 895e18 | mov dword ptr [esi + 0x18], ebx // c645fc01 | mov byte ptr [ebp - 4], 1 // 6a18 | push 0x18 // 895e28 | mov dword ptr [esi + 0x28], ebx // e8???????? | // 83c404 | add esp, 4 $sequence_16 = { e8???????? 8918 8d550c 8d4740 } // n = 4, score = 1000 // e8???????? | // 8918 | mov dword ptr [eax], ebx // 8d550c | lea edx, [ebp + 0xc] // 8d4740 | lea eax, [edi + 0x40] $sequence_17 = { e8???????? 83c404 897710 897714 897718 } // n = 5, score = 1000 // 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_18 = { 8b7508 33db 6a18 895e08 } // n = 4, score = 1000 // 8b7508 | mov esi, dword ptr [ebp + 8] // 33db | xor ebx, ebx // 6a18 | push 0x18 // 895e08 | mov dword ptr [esi + 8], ebx $sequence_19 = { 83c404 8945b0 8b45b4 50 } // n = 4, score = 500 // 83c404 | add esp, 4 // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45b4 | mov eax, dword ptr [ebp - 0x4c] // 50 | push eax $sequence_20 = { c685c6e0ffff8a c685c7e0fffff9 c685c8e0ffff50 c685c9e0ffffe4 } // n = 4, score = 300 // c685c6e0ffff8a | mov byte ptr [ebp - 0x1f3a], 0x8a // c685c7e0fffff9 | mov byte ptr [ebp - 0x1f39], 0xf9 // c685c8e0ffff50 | mov byte ptr [ebp - 0x1f38], 0x50 // c685c9e0ffffe4 | mov byte ptr [ebp - 0x1f37], 0xe4 $sequence_21 = { c685c5feffff22 c685c6feffffeb c685c7feffff63 c685c8feffff51 } // n = 4, score = 300 // c685c5feffff22 | mov byte ptr [ebp - 0x13b], 0x22 // c685c6feffffeb | mov byte ptr [ebp - 0x13a], 0xeb // c685c7feffff63 | mov byte ptr [ebp - 0x139], 0x63 // c685c8feffff51 | mov byte ptr [ebp - 0x138], 0x51 $sequence_22 = { c685c5fdffff6b c685c6fdfffff3 c685c7fdffff13 c685c8fdffff4d c685c9fdffff86 c685cafdffff4d c685cbfdffff16 } // n = 7, score = 300 // c685c5fdffff6b | mov byte ptr [ebp - 0x23b], 0x6b // c685c6fdfffff3 | mov byte ptr [ebp - 0x23a], 0xf3 // c685c7fdffff13 | mov byte ptr [ebp - 0x239], 0x13 // c685c8fdffff4d | mov byte ptr [ebp - 0x238], 0x4d // c685c9fdffff86 | mov byte ptr [ebp - 0x237], 0x86 // c685cafdffff4d | mov byte ptr [ebp - 0x236], 0x4d // c685cbfdffff16 | mov byte ptr [ebp - 0x235], 0x16 $sequence_23 = { c685c6e1ffff44 c685c7e1ffff05 c685c8e1ffff17 c685c9e1ffff07 } // n = 4, score = 300 // c685c6e1ffff44 | mov byte ptr [ebp - 0x1e3a], 0x44 // c685c7e1ffff05 | mov byte ptr [ebp - 0x1e39], 5 // c685c8e1ffff17 | mov byte ptr [ebp - 0x1e38], 0x17 // c685c9e1ffff07 | mov byte ptr [ebp - 0x1e37], 7 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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