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rule win_flame_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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???????? } // n = 4, score = 400 // 741a | je 0x1c // 83f901 | cmp ecx, 1 // 7415 | je 0x17 // e8???????? | $sequence_1 = { 8b8ea4000000 48b8abaaaaaaaaaaaaaa 4c8bc5 48f7e1 } // n = 4, score = 200 // 8b8ea4000000 | shr edx, 3 // 48b8abaaaaaaaaaaaaaa | dec eax // 4c8bc5 | add ecx, ebp // 48f7e1 | test al, al $sequence_2 = { a3???????? 85c0 0f84c8fcffff 68???????? ff35???????? e8???????? } // n = 6, score = 200 // a3???????? | // 85c0 | test eax, eax // 0f84c8fcffff | je 0xfffffcce // 68???????? | // ff35???????? | // e8???????? | $sequence_3 = { 744c 8b7518 ff75f8 8bce e8???????? 8b06 } // n = 6, score = 200 // 744c | je 0x4e // 8b7518 | mov esi, dword ptr [ebp + 0x18] // ff75f8 | push dword ptr [ebp - 8] // 8bce | mov ecx, esi // e8???????? | // 8b06 | mov eax, dword ptr [esi] $sequence_4 = { 8b8ea0000000 48c1ea03 4803cd ff15???????? } // n = 4, score = 200 // 8b8ea0000000 | test al, al // 48c1ea03 | je 0xf // 4803cd | dec eax // ff15???????? | $sequence_5 = { ffd7 90 eb00 4883c430 5f 5e } // n = 6, score = 200 // ffd7 | call edi // 90 | nop // eb00 | jmp 2 // 4883c430 | dec eax // 5f | add esp, 0x30 // 5e | pop edi $sequence_6 = { 8b8ea0000000 4803cd ff15???????? 84c0 } // n = 4, score = 200 // 8b8ea0000000 | and ecx, eax // 4803cd | mov esi, dword ptr [esi + ecx*4] // ff15???????? | // 84c0 | jmp 0x2f $sequence_7 = { 58 5e 5d c3 c701???????? c3 } // n = 6, score = 200 // 58 | pop eax // 5e | pop esi // 5d | pop ebp // c3 | ret // c701???????? | // c3 | ret $sequence_8 = { 8b400c 83c006 50 ff15???????? 33db } // n = 5, score = 200 // 8b400c | mov eax, dword ptr [eax + 0xc] // 83c006 | add eax, 6 // 50 | push eax // ff15???????? | // 33db | xor ebx, ebx $sequence_9 = { 8365fc00 e9???????? b8???????? e8???????? } // n = 4, score = 200 // 8365fc00 | and dword ptr [ebp - 4], 0 // e9???????? | // b8???????? | // e8???????? | $sequence_10 = { 7422 663b3b 0f94c0 84c0 } // n = 4, score = 200 // 7422 | pop esi // 663b3b | je 0x24 // 0f94c0 | cmp di, word ptr [ebx] // 84c0 | sete al $sequence_11 = { ff15???????? 85c0 742e 56 8b35???????? 8d4514 } // n = 6, score = 200 // ff15???????? | // 85c0 | test eax, eax // 742e | je 0x30 // 56 | push esi // 8b35???????? | // 8d4514 | lea eax, [ebp + 0x14] $sequence_12 = { 8b90b0000000 4903d3 eb64 448bc0 } // n = 4, score = 200 // 8b90b0000000 | mov eax, 0xaaaaaaab // 4903d3 | stosb byte ptr es:[edi], al // eb64 | stosb byte ptr es:[edi], al // 448bc0 | stosb byte ptr es:[edi], al $sequence_13 = { 8b8c2490000000 8bc3 4823c8 8b348e eb27 f6c240 0f8539020000 } // n = 7, score = 200 // 8b8c2490000000 | dec esp // 8bc3 | mov ecx, dword ptr [ebx + 0x2a] // 4823c8 | dec esp // 8b348e | mov eax, dword ptr [ebx + 0x22] // eb27 | mov ecx, dword ptr [esp + 0x90] // f6c240 | mov eax, ebx // 0f8539020000 | dec eax $sequence_14 = { ff15???????? 834dfcff 8d4de0 e8???????? b001 } // n = 5, score = 200 // ff15???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8d4de0 | lea ecx, [ebp - 0x20] // e8???????? | // b001 | mov al, 1 condition: 7 of them and filesize < 1676288 }
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