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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-06-10" 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 = "20210604" malpedia_hash = "be09d5d71e77373c0f538068be31a2ad4c69cfbd" malpedia_version = "20210616" 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???????? a1???????? 83781808 7205 8b4004 eb03 83c004 } // n = 7, score = 200 // e8???????? | // a1???????? | // 83781808 | cmp dword ptr [eax + 0x18], 8 // 7205 | jb 7 // 8b4004 | mov eax, dword ptr [eax + 4] // eb03 | jmp 5 // 83c004 | add eax, 4 $sequence_1 = { 8945f0 ffd6 8b4de8 8b490c 8b7508 8d0448 0345f0 } // n = 7, score = 200 // 8945f0 | mov dword ptr [ebp - 0x10], eax // ffd6 | call esi // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 8b490c | mov ecx, dword ptr [ecx + 0xc] // 8b7508 | mov esi, dword ptr [ebp + 8] // 8d0448 | lea eax, dword ptr [eax + ecx*2] // 0345f0 | add eax, dword ptr [ebp - 0x10] $sequence_2 = { ff7514 ff750c ff7510 50 e8???????? 83c418 85c0 } // n = 7, score = 200 // ff7514 | push dword ptr [ebp + 0x14] // ff750c | push dword ptr [ebp + 0xc] // ff7510 | push dword ptr [ebp + 0x10] // 50 | push eax // e8???????? | // 83c418 | add esp, 0x18 // 85c0 | test eax, eax $sequence_3 = { ff75f4 53 ff15???????? 83f8ff 7434 57 8d45fc } // n = 7, score = 200 // ff75f4 | push dword ptr [ebp - 0xc] // 53 | push ebx // ff15???????? | // 83f8ff | cmp eax, -1 // 7434 | je 0x36 // 57 | push edi // 8d45fc | lea eax, dword ptr [ebp - 4] $sequence_4 = { e8???????? c645fc02 8d45d4 50 e8???????? 885dfc 57 } // n = 7, score = 200 // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 8d45d4 | lea eax, dword ptr [ebp - 0x2c] // 50 | push eax // e8???????? | // 885dfc | mov byte ptr [ebp - 4], bl // 57 | push edi $sequence_5 = { c21000 b8???????? e8???????? 83ec5c 8365f000 53 56 } // n = 7, score = 200 // c21000 | ret 0x10 // b8???????? | // e8???????? | // 83ec5c | sub esp, 0x5c // 8365f000 | and dword ptr [ebp - 0x10], 0 // 53 | push ebx // 56 | push esi $sequence_6 = { 57 e8???????? 84c0 0f8581000000 53 bb???????? 53 } // n = 7, score = 200 // 57 | push edi // e8???????? | // 84c0 | test al, al // 0f8581000000 | jne 0x87 // 53 | push ebx // bb???????? | // 53 | push ebx $sequence_7 = { c645fc04 8d45cc 50 e8???????? 8bc6 50 8d8538ffffff } // n = 7, score = 200 // c645fc04 | mov byte ptr [ebp - 4], 4 // 8d45cc | lea eax, dword ptr [ebp - 0x34] // 50 | push eax // e8???????? | // 8bc6 | mov eax, esi // 50 | push eax // 8d8538ffffff | lea eax, dword ptr [ebp - 0xc8] $sequence_8 = { ff750c 8d8570ffffff 50 e8???????? c645fc02 6a00 6a01 } // n = 7, score = 200 // ff750c | push dword ptr [ebp + 0xc] // 8d8570ffffff | lea eax, dword ptr [ebp - 0x90] // 50 | push eax // e8???????? | // c645fc02 | mov byte ptr [ebp - 4], 2 // 6a00 | push 0 // 6a01 | push 1 $sequence_9 = { c20400 55 8bec 8b4804 8b4908 33d2 83ec0c } // n = 7, score = 200 // c20400 | ret 4 // 55 | push ebp // 8bec | mov ebp, esp // 8b4804 | mov ecx, dword ptr [eax + 4] // 8b4908 | mov ecx, dword ptr [ecx + 8] // 33d2 | xor edx, edx // 83ec0c | sub esp, 0xc 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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