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rule win_stuxnet_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { c645fc06 68???????? 8d45d4 50 e8???????? c645fc07 8d45b4 } // n = 7, score = 200 // c645fc06 | mov byte ptr [ebp - 4], 6 // 68???????? | // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // e8???????? | // c645fc07 | mov byte ptr [ebp - 4], 7 // 8d45b4 | lea eax, [ebp - 0x4c] $sequence_1 = { 8b5d08 56 57 6a02 68???????? 8bf9 e8???????? } // n = 7, score = 200 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 56 | push esi // 57 | push edi // 6a02 | push 2 // 68???????? | // 8bf9 | mov edi, ecx // e8???????? | $sequence_2 = { b8???????? e8???????? 83ec1c 56 57 8b7d08 ff750c } // n = 7, score = 200 // b8???????? | // e8???????? | // 83ec1c | sub esp, 0x1c // 56 | push esi // 57 | push edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // ff750c | push dword ptr [ebp + 0xc] $sequence_3 = { c9 c3 8d4ddc 51 ffd0 33c0 66837ddc09 } // n = 7, score = 200 // c9 | leave // c3 | ret // 8d4ddc | lea ecx, [ebp - 0x24] // 51 | push ecx // ffd0 | call eax // 33c0 | xor eax, eax // 66837ddc09 | cmp word ptr [ebp - 0x24], 9 $sequence_4 = { e8???????? 59 59 84c0 741e 8d8d38fdffff e8???????? } // n = 7, score = 200 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 84c0 | test al, al // 741e | je 0x20 // 8d8d38fdffff | lea ecx, [ebp - 0x2c8] // e8???????? | $sequence_5 = { e8???????? 59 8945ec 33f6 46 8975fc 85c0 } // n = 7, score = 200 // e8???????? | // 59 | pop ecx // 8945ec | mov dword ptr [ebp - 0x14], eax // 33f6 | xor esi, esi // 46 | inc esi // 8975fc | mov dword ptr [ebp - 4], esi // 85c0 | test eax, eax $sequence_6 = { 50 e8???????? c645fc03 c68570ffffff01 8b4dec 8b01 ff5008 } // n = 7, score = 200 // 50 | push eax // e8???????? | // c645fc03 | mov byte ptr [ebp - 4], 3 // c68570ffffff01 | mov byte ptr [ebp - 0x90], 1 // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 8b01 | mov eax, dword ptr [ecx] // ff5008 | call dword ptr [eax + 8] $sequence_7 = { c645fc06 53 6a01 8d759c e8???????? 8b4d08 8b01 } // n = 7, score = 200 // c645fc06 | mov byte ptr [ebp - 4], 6 // 53 | push ebx // 6a01 | push 1 // 8d759c | lea esi, [ebp - 0x64] // e8???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 8b01 | mov eax, dword ptr [ecx] $sequence_8 = { b8???????? e8???????? 56 ff750c 8b7508 e8???????? 834dfcff } // n = 7, score = 200 // b8???????? | // e8???????? | // 56 | push esi // ff750c | push dword ptr [ebp + 0xc] // 8b7508 | mov esi, dword ptr [ebp + 8] // e8???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff $sequence_9 = { e8???????? c645fc05 8d4538 50 e8???????? c645fc06 8d4558 } // n = 7, score = 200 // e8???????? | // c645fc05 | mov byte ptr [ebp - 4], 5 // 8d4538 | lea eax, [ebp + 0x38] // 50 | push eax // e8???????? | // c645fc06 | mov byte ptr [ebp - 4], 6 // 8d4558 | lea eax, [ebp + 0x58] 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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