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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-05-04" 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 = "20260422" malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14" malpedia_version = "20260504" 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???????? bef4030000 03c6 e8???????? 8845ef 834dfcff 8d45e8 } // n = 7, score = 200 // e8???????? | // bef4030000 | mov esi, 0x3f4 // 03c6 | add eax, esi // e8???????? | // 8845ef | mov byte ptr [ebp - 0x11], al // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8d45e8 | lea eax, [ebp - 0x18] $sequence_1 = { c3 55 8bec 83ec44 56 6a44 8d45bc } // n = 7, score = 200 // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 83ec44 | sub esp, 0x44 // 56 | push esi // 6a44 | push 0x44 // 8d45bc | lea eax, [ebp - 0x44] $sequence_2 = { b8???????? e8???????? 81ecc8010000 53 56 57 8965f0 } // n = 7, score = 200 // b8???????? | // e8???????? | // 81ecc8010000 | sub esp, 0x1c8 // 53 | push ebx // 56 | push esi // 57 | push edi // 8965f0 | mov dword ptr [ebp - 0x10], esp $sequence_3 = { 53 e8???????? 8d45d8 50 56 e8???????? 8365fc00 } // n = 7, score = 200 // 53 | push ebx // e8???????? | // 8d45d8 | lea eax, [ebp - 0x28] // 50 | push eax // 56 | push esi // e8???????? | // 8365fc00 | and dword ptr [ebp - 4], 0 $sequence_4 = { ff75e8 ff15???????? 85c0 0f85defeffff eb1a 8d45ac 50 } // n = 7, score = 200 // ff75e8 | push dword ptr [ebp - 0x18] // ff15???????? | // 85c0 | test eax, eax // 0f85defeffff | jne 0xfffffee4 // eb1a | jmp 0x1c // 8d45ac | lea eax, [ebp - 0x54] // 50 | push eax $sequence_5 = { c645fc05 8d45f0 50 e8???????? c645fc04 8b75e8 3bf3 } // n = 7, score = 200 // c645fc05 | mov byte ptr [ebp - 4], 5 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // e8???????? | // c645fc04 | mov byte ptr [ebp - 4], 4 // 8b75e8 | mov esi, dword ptr [ebp - 0x18] // 3bf3 | cmp esi, ebx $sequence_6 = { e8???????? 50 8d470c 50 ff15???????? 83670800 8d8714020000 } // n = 7, score = 200 // e8???????? | // 50 | push eax // 8d470c | lea eax, [edi + 0xc] // 50 | push eax // ff15???????? | // 83670800 | and dword ptr [edi + 8], 0 // 8d8714020000 | lea eax, [edi + 0x214] $sequence_7 = { 8b5d08 56 6880000000 8bc3 e8???????? 8bf0 59 } // n = 7, score = 200 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 56 | push esi // 6880000000 | push 0x80 // 8bc3 | mov eax, ebx // e8???????? | // 8bf0 | mov esi, eax // 59 | pop ecx $sequence_8 = { e8???????? 8b4c2410 8988b4000000 8b4c2414 8988b8000000 834c2424ff 8d44240c } // n = 7, score = 200 // e8???????? | // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] // 8988b4000000 | mov dword ptr [eax + 0xb4], ecx // 8b4c2414 | mov ecx, dword ptr [esp + 0x14] // 8988b8000000 | mov dword ptr [eax + 0xb8], ecx // 834c2424ff | or dword ptr [esp + 0x24], 0xffffffff // 8d44240c | lea eax, [esp + 0xc] $sequence_9 = { c645fc03 8d462c 50 895e24 895e28 e8???????? 59 } // n = 7, score = 200 // c645fc03 | mov byte ptr [ebp - 4], 3 // 8d462c | lea eax, [esi + 0x2c] // 50 | push eax // 895e24 | mov dword ptr [esi + 0x24], ebx // 895e28 | mov dword ptr [esi + 0x28], ebx // e8???????? | // 59 | pop ecx 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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