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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-09-17" 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 = "20260916" malpedia_hash = "53a643781c18e08f4a50949af60172d837a0b6f6" malpedia_version = "20260917" 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???????? c3 b8???????? e9???????? 8d4de0 e9???????? 8d4dd0 } // n = 7, score = 200 // e8???????? | // c3 | ret // b8???????? | // e9???????? | // 8d4de0 | lea ecx, [ebp - 0x20] // e9???????? | // 8d4dd0 | lea ecx, [ebp - 0x30] $sequence_1 = { ebd0 e8???????? 6a02 3998c8000000 7407 68???????? ebb5 } // n = 7, score = 200 // ebd0 | jmp 0xffffffd2 // e8???????? | // 6a02 | push 2 // 3998c8000000 | cmp dword ptr [eax + 0xc8], ebx // 7407 | je 9 // 68???????? | // ebb5 | jmp 0xffffffb7 $sequence_2 = { e8???????? 83ec78 8365f000 53 56 68???????? 8d45b8 } // n = 7, score = 200 // e8???????? | // 83ec78 | sub esp, 0x78 // 8365f000 | and dword ptr [ebp - 0x10], 0 // 53 | push ebx // 56 | push esi // 68???????? | // 8d45b8 | lea eax, [ebp - 0x48] $sequence_3 = { c20c00 55 8bec 83ec10 53 8b5d08 8b4318 } // n = 7, score = 200 // c20c00 | ret 0xc // 55 | push ebp // 8bec | mov ebp, esp // 83ec10 | sub esp, 0x10 // 53 | push ebx // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8b4318 | mov eax, dword ptr [ebx + 0x18] $sequence_4 = { e8???????? 83c40c c645fc08 837f2008 8b0f 7205 8b470c } // n = 7, score = 200 // e8???????? | // 83c40c | add esp, 0xc // c645fc08 | mov byte ptr [ebp - 4], 8 // 837f2008 | cmp dword ptr [edi + 0x20], 8 // 8b0f | mov ecx, dword ptr [edi] // 7205 | jb 7 // 8b470c | mov eax, dword ptr [edi + 0xc] $sequence_5 = { ff75e8 e8???????? 59 c3 b8???????? e9???????? 8d45b8 } // n = 7, score = 200 // ff75e8 | push dword ptr [ebp - 0x18] // e8???????? | // 59 | pop ecx // c3 | ret // b8???????? | // e9???????? | // 8d45b8 | lea eax, [ebp - 0x48] $sequence_6 = { e8???????? c644247400 8d44244c 50 e8???????? 68???????? 57 } // n = 7, score = 200 // e8???????? | // c644247400 | mov byte ptr [esp + 0x74], 0 // 8d44244c | lea eax, [esp + 0x4c] // 50 | push eax // e8???????? | // 68???????? | // 57 | push edi $sequence_7 = { 85c0 7410 57 50 8b450c 8b38 e8???????? } // n = 7, score = 200 // 85c0 | test eax, eax // 7410 | je 0x12 // 57 | push edi // 50 | push eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 8b38 | mov edi, dword ptr [eax] // e8???????? | $sequence_8 = { c745fc01000000 ff75f0 68???????? e8???????? 837f1808 8b45e8 59 } // n = 7, score = 200 // c745fc01000000 | mov dword ptr [ebp - 4], 1 // ff75f0 | push dword ptr [ebp - 0x10] // 68???????? | // e8???????? | // 837f1808 | cmp dword ptr [edi + 0x18], 8 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 59 | pop ecx $sequence_9 = { e8???????? 8b4df4 5e 64890d00000000 5b c9 c21000 } // n = 7, score = 200 // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 5e | pop esi // 64890d00000000 | mov dword ptr fs:[0], ecx // 5b | pop ebx // c9 | leave // c21000 | ret 0x10 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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