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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-05-30" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.stuxnet" malpedia_rule_date = "20200529" malpedia_hash = "92c362319514e5a6da26204961446caa3a8b32a8" malpedia_version = "20200529" malpedia_license = "CC BY-NC-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 / approach 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 = { c745fc05000000 8b7e10 8d5fd4 57 57 53 e8???????? } // n = 7, score = 200 // c745fc05000000 | mov dword ptr [ebp - 4], 5 // 8b7e10 | mov edi, dword ptr [esi + 0x10] // 8d5fd4 | lea ebx, [edi - 0x2c] // 57 | push edi // 57 | push edi // 53 | push ebx // e8???????? | $sequence_1 = { c700???????? 8b5108 895008 8b510c 56 89500c 57 } // n = 7, score = 200 // c700???????? | // 8b5108 | mov edx, dword ptr [ecx + 8] // 895008 | mov dword ptr [eax + 8], edx // 8b510c | mov edx, dword ptr [ecx + 0xc] // 56 | push esi // 89500c | mov dword ptr [eax + 0xc], edx // 57 | push edi $sequence_2 = { b8???????? e9???????? e9???????? 8b4508 e9???????? ff7508 e8???????? } // n = 7, score = 200 // b8???????? | // e9???????? | // e9???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // e9???????? | // ff7508 | push dword ptr [ebp + 8] // e8???????? | $sequence_3 = { e8???????? c3 8d45dc 50 e8???????? c3 8d4dbc } // n = 7, score = 200 // e8???????? | // c3 | ret // 8d45dc | lea eax, [ebp - 0x24] // 50 | push eax // e8???????? | // c3 | ret // 8d4dbc | lea ecx, [ebp - 0x44] $sequence_4 = { ff8000010000 c9 c3 55 8bec 83ec10 56 } // n = 7, score = 200 // ff8000010000 | inc dword ptr [eax + 0x100] // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83ec10 | sub esp, 0x10 // 56 | push esi $sequence_5 = { ab 51 c6461801 ff15???????? 834dfcff 8b4df4 5f } // n = 7, score = 200 // ab | stosd dword ptr es:[edi], eax // 51 | push ecx // c6461801 | mov byte ptr [esi + 0x18], 1 // ff15???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 5f | pop edi $sequence_6 = { 56 57 ff742410 8b7c2410 8bf1 e8???????? 84c0 } // n = 7, score = 200 // 56 | push esi // 57 | push edi // ff742410 | push dword ptr [esp + 0x10] // 8b7c2410 | mov edi, dword ptr [esp + 0x10] // 8bf1 | mov esi, ecx // e8???????? | // 84c0 | test al, al $sequence_7 = { 56 57 8b7d08 33c0 8d7704 8807 8906 } // n = 7, score = 200 // 56 | push esi // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 33c0 | xor eax, eax // 8d7704 | lea esi, [edi + 4] // 8807 | mov byte ptr [edi], al // 8906 | mov dword ptr [esi], eax $sequence_8 = { eb6a 53 6804010000 ff7510 6a00 56 e8???????? } // n = 7, score = 200 // eb6a | jmp 0x6c // 53 | push ebx // 6804010000 | push 0x104 // ff7510 | push dword ptr [ebp + 0x10] // 6a00 | push 0 // 56 | push esi // e8???????? | $sequence_9 = { 7408 8b45fc e9???????? 8b45e8 8945f4 8b45e8 83c024 } // n = 7, score = 200 // 7408 | je 0xa // 8b45fc | mov eax, dword ptr [ebp - 4] // e9???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 8945f4 | mov dword ptr [ebp - 0xc], eax // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 83c024 | add eax, 0x24 condition: 7 of them and filesize < 2495488 }
rule win_stuxnet_w0 { meta: author = "JAG-S (turla@chronicle.security)" hash = "c1961e54d60e34bbec397c9120564e8d08f2f243ae349d2fb20f736510716579" description = "Stuxshop standalone sample configuration" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.stuxnet" malpedia_version = "20190418" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $cnc1 = "http://211.24.237.226/index.php?data=" ascii wide $cnc2 = "http://todaysfutbol.com/index.php?data=" ascii wide $cnc3 = "http://78.111.169.146/index.php?data=" ascii wide $cnc4 = "http://mypremierfutbol.com/index.php?data=" ascii wide $regkey1 = "Software\\Microsoft\\Windows\\CurrentVersion\\MS-DOS Emulation" ascii wide $regkey2 = "NTVDMParams" ascii wide $flowerOverlap1 = { 85 C0 75 3B 57 FF 75 1C FF 75 18 FF 75 14 50 FF 75 10 FF 75 FC FF 15 } $flowerOverlap2 = { 85 C0 75 4C 8B 45 1C 89 45 0C 8D 45 0C 50 8D 45 08 FF 75 18 50 6A 00 FF 75 10 FF 75 20 FF 15 } $flowerOverlap3 = { 55 8B EC 53 56 8B 75 20 85 F6 74 03 83 26 00 8D 45 20 5068 19 00 02 00 6A 00 FF 75 0C FF 75 08 } $flowerOverlap4 = { 55 8B EC 51 8D 4D FC 33 C0 51 50 6A 26 50 89 45 FC FF 15 } $flowerOverlap5 = { 85 DB 74 04 8B C3 EB 1A 8B 45 08 3B 45 14 74 07 B8 5D 06 00 00 EB 0B 85 F6 74 05 8B 45 0C 89 06 } $flowerOverlap6 = { 85 FF 74 12 83 7D F8 01 75 0C FF 75 0C FF 75 08 FF 15 } condition: all of ($flowerOverlap*) or 2 of ($cnc*) or all of ($regkey*) }
rule win_stuxnet_w1 { meta: author = "Silas Cutler (havex@Chronicle.Security)" desc = "Identifies the OS Check function in STUXSHOP and CheshireCat" hash = "c1961e54d60e34bbec397c9120564e8d08f2f243ae349d2fb20f736510716579" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.stuxnet" malpedia_version = "20190418" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $ = {10 F7 D8 1B C0 83 C0 ?? E9 ?? 01 00 00 39 85 7C FF FF FF 0F 85 ?? 01 00 00 83 BD 70 FF FF FF 04 8B 8D 74 FF FF FF 75 0B 85 C9 0F 85 ?? 01 00 00 6A 05 5E } $ = {01 00 00 3B FA 0F 84 ?? 01 00 00 80 7D 80 00 B1 62 74 1D 6A 0D 8D 45 80 68 ?? ?? ?? 10 50 FF 15 ?? ?? ?? 10 83 C4 0C B1 6F 85 C0 75 03 8A 4D 8D 8B C6 } condition: any of them }
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