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rule win_flame_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.flame." 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.flame" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 741a 83f901 7415 e8???????? c70016000000 e8???????? 83c8ff } // n = 7, score = 400 // 741a | je 0x1c // 83f901 | cmp ecx, 1 // 7415 | je 0x17 // e8???????? | // c70016000000 | mov dword ptr [eax], 0x16 // e8???????? | // 83c8ff | or eax, 0xffffffff $sequence_1 = { ff7508 ff15???????? c70424???????? ff7508 ff15???????? 59 59 } // n = 7, score = 200 // ff7508 | je 0x1a // ff15???????? | // c70424???????? | // ff7508 | mov dword ptr [eax], 0x16 // ff15???????? | // 59 | test ecx, ecx // 59 | je 0x1c $sequence_2 = { 7404 6afd ebd2 57 56 } // n = 5, score = 200 // 7404 | je 0x1c // 6afd | cmp ecx, 1 // ebd2 | je 0x1c // 57 | mov dword ptr [eax], 0x16 // 56 | cmp ecx, 1 $sequence_3 = { 2bc8 8b01 89450c 8d450c } // n = 4, score = 200 // 2bc8 | cmp ecx, ebx // 8b01 | jbe 0xffffff32 // 89450c | inc esp // 8d450c | mov ebp, dword ptr [ebp - 0x5c] $sequence_4 = { 8038b8 75f4 33c9 8178011e000d00 0f94c1 894dec } // n = 6, score = 200 // 8038b8 | add esi, edi // 75f4 | test eax, eax // 33c9 | je 0x30 // 8178011e000d00 | mov edx, dword ptr [ebp] // 0f94c1 | mov esi, dword ptr [ebp - 0x60] // 894dec | inc ebp $sequence_5 = { 7429 488b4c2428 488d542450 41b8df010000 } // n = 4, score = 200 // 7429 | dec ecx // 488b4c2428 | mov edx, dword ptr [esi + 0x10] // 488d542450 | mov ecx, dword ptr [edi + 0x18] // 41b8df010000 | mov eax, ebx $sequence_6 = { ffd7 90 eb00 4883c430 5f 5e } // n = 6, score = 200 // ffd7 | mov ecx, dword ptr [esp + 0x28] // 90 | dec eax // eb00 | lea edx, [esp + 0x50] // 4883c430 | inc ecx // 5f | mov eax, 0x1df // 5e | je 0x2b $sequence_7 = { 8b45ec c645fc02 8d4dec 51 50 6a0d } // n = 6, score = 200 // 8b45ec | mov esi, dword ptr [ebx + 0x24] // c645fc02 | inc ebp // 8d4dec | xor esp, esp // 51 | dec eax // 50 | add ebp, edi // 6a0d | dec eax $sequence_8 = { 7428 448865dc 41c1ec08 488d55dc } // n = 4, score = 200 // 7428 | lea edx, [esp + 0x50] // 448865dc | inc ecx // 41c1ec08 | mov eax, 0x1df // 488d55dc | test eax, eax $sequence_9 = { 8b7324 4533e4 4803ef 4803f7 } // n = 4, score = 200 // 8b7324 | inc esp // 4533e4 | mov byte ptr [ebp - 0x23], ah // 4803ef | je 0x2a // 4803f7 | inc esp $sequence_10 = { 897de8 885dfc 68???????? 8d45bc eb9f 8b460c 8b4806 } // n = 7, score = 200 // 897de8 | je 0x1c // 885dfc | cmp ecx, 1 // 68???????? | // 8d45bc | je 0x17 // eb9f | mov dword ptr [eax], 0x16 // 8b460c | je 0x1c // 8b4806 | cmp ecx, 1 $sequence_11 = { 7428 41b918000000 4533c0 488bd0 c744242050000000 ff15???????? } // n = 6, score = 200 // 7428 | dec eax // 41b918000000 | mov ecx, dword ptr [esp + 0x28] // 4533c0 | dec eax // 488bd0 | lea edx, [esp + 0x50] // c744242050000000 | inc ecx // ff15???????? | $sequence_12 = { 8b7008 83fe2a 7421 83fe45 } // n = 4, score = 200 // 8b7008 | mov ecx, 0x18 // 83fe2a | inc ebp // 7421 | xor eax, eax // 83fe45 | dec eax $sequence_13 = { e8???????? 68???????? 8d8508ffffff 50 e8???????? 8b4d08 83791410 } // n = 7, score = 200 // e8???????? | // 68???????? | // 8d8508ffffff | cmp ecx, 1 // 50 | je 0x1c // e8???????? | // 8b4d08 | mov dword ptr [eax], 0x16 // 83791410 | test ecx, ecx $sequence_14 = { 7428 498b5610 8b4f18 8bc3 } // n = 4, score = 200 // 7428 | je 0x2a // 498b5610 | dec ecx // 8b4f18 | mov edx, dword ptr [esi + 0x10] // 8bc3 | mov ecx, dword ptr [edi + 0x18] condition: 7 of them and filesize < 1676288 }
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