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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-08-17" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.stuxnet" malpedia_rule_date = "20200817" malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5" malpedia_version = "20200817" 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 / approach 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 = { 83f8ff 7524 807df300 7486 50 56 8d4580 } // n = 7, score = 100 // 83f8ff | cmp eax, -1 // 7524 | jne 0x26 // 807df300 | cmp byte ptr [ebp - 0xd], 0 // 7486 | je 0xffffff88 // 50 | push eax // 56 | push esi // 8d4580 | lea eax, [ebp - 0x80] $sequence_1 = { ff7410fc 52 50 51 e8???????? c20800 55 } // n = 7, score = 100 // ff7410fc | push dword ptr [eax + edx - 4] // 52 | push edx // 50 | push eax // 51 | push ecx // e8???????? | // c20800 | ret 8 // 55 | push ebp $sequence_2 = { 751c 68???????? 8d45a4 50 c745a801000000 c745a498239600 e8???????? } // n = 7, score = 100 // 751c | jne 0x1e // 68???????? | // 8d45a4 | lea eax, [ebp - 0x5c] // 50 | push eax // c745a801000000 | mov dword ptr [ebp - 0x58], 1 // c745a498239600 | mov dword ptr [ebp - 0x5c], 0x962398 // e8???????? | $sequence_3 = { 7542 6804010000 8d442408 50 56 ff15???????? 6860540010 } // n = 7, score = 100 // 7542 | jne 0x44 // 6804010000 | push 0x104 // 8d442408 | lea eax, [esp + 8] // 50 | push eax // 56 | push esi // ff15???????? | // 6860540010 | push 0x10005460 $sequence_4 = { e8???????? 85ff 5f 5e 5b 7431 c7453c04000000 } // n = 7, score = 100 // e8???????? | // 85ff | test edi, edi // 5f | pop edi // 5e | pop esi // 5b | pop ebx // 7431 | je 0x33 // c7453c04000000 | mov dword ptr [ebp + 0x3c], 4 $sequence_5 = { 8d442420 50 8bf1 e8???????? 33ff 897c2444 8d44240f } // n = 7, score = 100 // 8d442420 | lea eax, [esp + 0x20] // 50 | push eax // 8bf1 | mov esi, ecx // e8???????? | // 33ff | xor edi, edi // 897c2444 | mov dword ptr [esp + 0x44], edi // 8d44240f | lea eax, [esp + 0xf] $sequence_6 = { e9???????? 8b45ec 8b4df8 0388a0000000 894dfc 8b45fc 83780400 } // n = 7, score = 100 // e9???????? | // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b4df8 | mov ecx, dword ptr [ebp - 8] // 0388a0000000 | add ecx, dword ptr [eax + 0xa0] // 894dfc | mov dword ptr [ebp - 4], ecx // 8b45fc | mov eax, dword ptr [ebp - 4] // 83780400 | cmp dword ptr [eax + 4], 0 $sequence_7 = { e8???????? 59 50 8d7e18 57 e8???????? 895dfc } // n = 7, score = 100 // e8???????? | // 59 | pop ecx // 50 | push eax // 8d7e18 | lea edi, [esi + 0x18] // 57 | push edi // e8???????? | // 895dfc | mov dword ptr [ebp - 4], ebx $sequence_8 = { e8???????? 8364245400 8d44242c e8???????? 8b5d08 8d44242c 50 } // n = 7, score = 100 // e8???????? | // 8364245400 | and dword ptr [esp + 0x54], 0 // 8d44242c | lea eax, [esp + 0x2c] // e8???????? | // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 8d44242c | lea eax, [esp + 0x2c] // 50 | push eax $sequence_9 = { e8???????? c3 8d4580 50 e8???????? c3 8d4580 } // n = 7, score = 100 // e8???????? | // c3 | ret // 8d4580 | lea eax, [ebp - 0x80] // 50 | push eax // e8???????? | // c3 | ret // 8d4580 | lea eax, [ebp - 0x80] condition: 7 of them and filesize < 2482176 }
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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