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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { c645fc02 c700???????? c645fc03 c700???????? 885dfc eb02 33c0 } // n = 7, score = 200 // c645fc02 | mov byte ptr [ebp - 4], 2 // c700???????? | // c645fc03 | mov byte ptr [ebp - 4], 3 // c700???????? | // 885dfc | mov byte ptr [ebp - 4], bl // eb02 | jmp 4 // 33c0 | xor eax, eax $sequence_1 = { c645fc02 8d45b4 50 68???????? e8???????? 59 59 } // n = 7, score = 200 // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d45b4 | lea eax, [ebp - 0x4c] // 50 | push eax // 68???????? | // e8???????? | // 59 | pop ecx // 59 | pop ecx $sequence_2 = { c21000 56 8bf0 81fe24499204 7605 e8???????? 8bce } // n = 7, score = 200 // c21000 | ret 0x10 // 56 | push esi // 8bf0 | mov esi, eax // 81fe24499204 | cmp esi, 0x4924924 // 7605 | jbe 7 // e8???????? | // 8bce | mov ecx, esi $sequence_3 = { e9???????? 8d75bc e9???????? 8d8d44ffffff e9???????? 8d75d8 e9???????? } // n = 7, score = 200 // e9???????? | // 8d75bc | lea esi, [ebp - 0x44] // e9???????? | // 8d8d44ffffff | lea ecx, [ebp - 0xbc] // e9???????? | // 8d75d8 | lea esi, [ebp - 0x28] // e9???????? | $sequence_4 = { b001 84c0 740a f6c310 7505 33c0 40 } // n = 7, score = 200 // b001 | mov al, 1 // 84c0 | test al, al // 740a | je 0xc // f6c310 | test bl, 0x10 // 7505 | jne 7 // 33c0 | xor eax, eax // 40 | inc eax $sequence_5 = { e8???????? c645fc07 8dbd64ffffff e8???????? 8845ef c645fc02 8bce } // n = 7, score = 200 // e8???????? | // c645fc07 | mov byte ptr [ebp - 4], 7 // 8dbd64ffffff | lea edi, [ebp - 0x9c] // e8???????? | // 8845ef | mov byte ptr [ebp - 0x11], al // c645fc02 | mov byte ptr [ebp - 4], 2 // 8bce | mov ecx, esi $sequence_6 = { 59 885dfc 8d4de4 e8???????? 8b4df4 64890d00000000 5f } // n = 7, score = 200 // 59 | pop ecx // 885dfc | mov byte ptr [ebp - 4], bl // 8d4de4 | lea ecx, [ebp - 0x1c] // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 64890d00000000 | mov dword ptr fs:[0], ecx // 5f | pop edi $sequence_7 = { c645fc02 8d8554ffffff 50 e8???????? c645fc03 8d45d0 50 } // n = 7, score = 200 // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d8554ffffff | lea eax, [ebp - 0xac] // 50 | push eax // e8???????? | // c645fc03 | mov byte ptr [ebp - 4], 3 // 8d45d0 | lea eax, [ebp - 0x30] // 50 | push eax $sequence_8 = { c645fc05 8d45d4 50 e8???????? 8d4548 50 e8???????? } // n = 7, score = 200 // c645fc05 | mov byte ptr [ebp - 4], 5 // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // e8???????? | // 8d4548 | lea eax, [ebp + 0x48] // 50 | push eax // e8???????? | $sequence_9 = { e8???????? c645fc02 6820bf0200 8b45e8 e8???????? 0fb6c0 3bc3 } // n = 7, score = 200 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 6820bf0200 | push 0x2bf20 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // e8???????? | // 0fb6c0 | movzx eax, al // 3bc3 | cmp eax, ebx 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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