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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-01-05" version = "1" description = "Detects win.stuxnet." 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.stuxnet" malpedia_rule_date = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 = { e8???????? 84c0 7504 804e1104 e8???????? 84c0 7404 } // n = 7, score = 200 // e8???????? | // 84c0 | test al, al // 7504 | jne 6 // 804e1104 | or byte ptr [esi + 0x11], 4 // e8???????? | // 84c0 | test al, al // 7404 | je 6 $sequence_1 = { ff750c 8d4580 50 e8???????? 33db 895dfc 8d4580 } // n = 7, score = 200 // ff750c | push dword ptr [ebp + 0xc] // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // e8???????? | // 33db | xor ebx, ebx // 895dfc | mov dword ptr [ebp - 4], ebx // 8d4580 | lea eax, [ebp - 0x80] $sequence_2 = { ff75f8 8d963c0b0000 57 e8???????? 59 59 5f } // n = 7, score = 200 // ff75f8 | push dword ptr [ebp - 8] // 8d963c0b0000 | lea edx, [esi + 0xb3c] // 57 | push edi // e8???????? | // 59 | pop ecx // 59 | pop ecx // 5f | pop edi $sequence_3 = { c3 8b44240c 8906 33c0 40 5e c3 } // n = 7, score = 200 // c3 | ret // 8b44240c | mov eax, dword ptr [esp + 0xc] // 8906 | mov dword ptr [esi], eax // 33c0 | xor eax, eax // 40 | inc eax // 5e | pop esi // c3 | ret $sequence_4 = { 8d4580 50 8d8540ffffff 50 e8???????? c645fc05 50 } // n = 7, score = 200 // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // 8d8540ffffff | lea eax, [ebp - 0xc0] // 50 | push eax // e8???????? | // c645fc05 | mov byte ptr [ebp - 4], 5 // 50 | push eax $sequence_5 = { e8???????? ff75c8 8d45ec 50 e8???????? ff75c9 8d45ec } // n = 7, score = 200 // e8???????? | // ff75c8 | push dword ptr [ebp - 0x38] // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // e8???????? | // ff75c9 | push dword ptr [ebp - 0x37] // 8d45ec | lea eax, [ebp - 0x14] $sequence_6 = { b8???????? e8???????? 51 8365f000 56 8b7508 8d45f0 } // n = 7, score = 200 // b8???????? | // e8???????? | // 51 | push ecx // 8365f000 | and dword ptr [ebp - 0x10], 0 // 56 | push esi // 8b7508 | mov esi, dword ptr [ebp + 8] // 8d45f0 | lea eax, [ebp - 0x10] $sequence_7 = { e8???????? eb02 33c0 c645fc00 8b7d08 83c704 50 } // n = 7, score = 200 // e8???????? | // eb02 | jmp 4 // 33c0 | xor eax, eax // c645fc00 | mov byte ptr [ebp - 4], 0 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 83c704 | add edi, 4 // 50 | push eax $sequence_8 = { e8???????? 8906 895604 c9 c3 8b08 8b4004 } // n = 7, score = 200 // e8???????? | // 8906 | mov dword ptr [esi], eax // 895604 | mov dword ptr [esi + 4], edx // c9 | leave // c3 | ret // 8b08 | mov ecx, dword ptr [eax] // 8b4004 | mov eax, dword ptr [eax + 4] $sequence_9 = { 8955ec c7042410270000 e8???????? c645fc01 8b0e 8b01 6a02 } // n = 7, score = 200 // 8955ec | mov dword ptr [ebp - 0x14], edx // c7042410270000 | mov dword ptr [esp], 0x2710 // e8???????? | // c645fc01 | mov byte ptr [ebp - 4], 1 // 8b0e | mov ecx, dword ptr [esi] // 8b01 | mov eax, dword ptr [ecx] // 6a02 | push 2 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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