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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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???????? 33ff 59 59 3bdf 7410 3bde } // n = 7, score = 200 // e8???????? | // 33ff | xor edi, edi // 59 | pop ecx // 59 | pop ecx // 3bdf | cmp ebx, edi // 7410 | je 0x12 // 3bde | cmp ebx, esi $sequence_1 = { ff7510 8d4df4 e8???????? 33db 395d08 752e e8???????? } // n = 7, score = 200 // ff7510 | push dword ptr [ebp + 0x10] // 8d4df4 | lea ecx, [ebp - 0xc] // e8???????? | // 33db | xor ebx, ebx // 395d08 | cmp dword ptr [ebp + 8], ebx // 752e | jne 0x30 // e8???????? | $sequence_2 = { e8???????? c3 8d75c4 e9???????? 8b45ec e9???????? 8d75a8 } // n = 7, score = 200 // e8???????? | // c3 | ret // 8d75c4 | lea esi, [ebp - 0x3c] // e9???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // e9???????? | // 8d75a8 | lea esi, [ebp - 0x58] $sequence_3 = { e8???????? 8975f0 c645fc00 8d4db4 e8???????? 8b4df4 8b4508 } // n = 7, score = 200 // e8???????? | // 8975f0 | mov dword ptr [ebp - 0x10], esi // c645fc00 | mov byte ptr [ebp - 4], 0 // 8d4db4 | lea ecx, [ebp - 0x4c] // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 8b4508 | mov eax, dword ptr [ebp + 8] $sequence_4 = { e8???????? c684245401000007 8d44242c 50 e8???????? c684245401000008 6a00 } // n = 7, score = 200 // e8???????? | // c684245401000007 | mov byte ptr [esp + 0x154], 7 // 8d44242c | lea eax, [esp + 0x2c] // 50 | push eax // e8???????? | // c684245401000008 | mov byte ptr [esp + 0x154], 8 // 6a00 | push 0 $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 = { a5 a5 ff4d0c 8345080c ebe4 834dfcff 8b4df4 } // n = 7, score = 200 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // ff4d0c | dec dword ptr [ebp + 0xc] // 8345080c | add dword ptr [ebp + 8], 0xc // ebe4 | jmp 0xffffffe6 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_7 = { c745f001000000 7205 8b7610 eb03 83c610 ff750c 56 } // n = 7, score = 200 // c745f001000000 | mov dword ptr [ebp - 0x10], 1 // 7205 | jb 7 // 8b7610 | mov esi, dword ptr [esi + 0x10] // eb03 | jmp 5 // 83c610 | add esi, 0x10 // ff750c | push dword ptr [ebp + 0xc] // 56 | push esi $sequence_8 = { 745c c745ec03000000 c645fc01 50 8b4d08 e8???????? 8945ec } // n = 7, score = 200 // 745c | je 0x5e // c745ec03000000 | mov dword ptr [ebp - 0x14], 3 // c645fc01 | mov byte ptr [ebp - 4], 1 // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // e8???????? | // 8945ec | mov dword ptr [ebp - 0x14], eax $sequence_9 = { c9 c3 885dfc 8d4de4 e8???????? b001 ebe2 } // n = 7, score = 200 // c9 | leave // c3 | ret // 885dfc | mov byte ptr [ebp - 4], bl // 8d4de4 | lea ecx, [ebp - 0x1c] // e8???????? | // b001 | mov al, 1 // ebe2 | jmp 0xffffffe4 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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