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rule win_flame_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { ff15???????? 59 85c0 7410 68???????? ff7508 ff15???????? } // n = 7, score = 200 // ff15???????? | // 59 | cmp ecx, 1 // 85c0 | je 0x1c // 7410 | mov dword ptr [eax], 0x16 // 68???????? | // ff7508 | or eax, 0xffffffff // ff15???????? | $sequence_2 = { 8b83f0160000 2bc6 3983f4160000 7540 8b8384000000 85c0 } // n = 6, score = 200 // 8b83f0160000 | cmp dword ptr [ebx + 0x16f4], eax // 2bc6 | inc ecx // 3983f4160000 | sete dl // 7540 | dec dword ptr [ebx + 0x9c] // 8b8384000000 | add dword ptr [ebx + 0x94], esi // 85c0 | inc ebp $sequence_3 = { a3???????? 85c0 0f8453ffffff 68???????? ff35???????? } // n = 5, score = 200 // a3???????? | // 85c0 | mov dword ptr [eax], 0x16 // 0f8453ffffff | or eax, 0xffffffff // 68???????? | // ff35???????? | $sequence_4 = { 8975ec 8d45ec 50 6a01 } // n = 4, score = 200 // 8975ec | je 0x1e // 8d45ec | cmp ecx, 1 // 50 | je 0x1e // 6a01 | je 0x1c $sequence_5 = { 51 ffd0 83c704 8b07 85c0 75ed 8b06 } // n = 7, score = 200 // 51 | cmp ecx, 1 // ffd0 | je 0x17 // 83c704 | mov dword ptr [eax], 0x16 // 8b07 | test ecx, ecx // 85c0 | je 0x1e // 75ed | cmp ecx, 1 // 8b06 | je 0x1e $sequence_6 = { 8b83f0160000 2bc6 3983f4160000 410f94c2 ff8b9c000000 01b394000000 4585d2 } // n = 7, score = 200 // 8b83f0160000 | test ebx, ebx // 2bc6 | jne 0xfffffff0 // 3983f4160000 | dec eax // 410f94c2 | mov ecx, edi // ff8b9c000000 | dec eax // 01b394000000 | mov ebx, dword ptr [esp + 0x30] // 4585d2 | mov eax, dword ptr [ebx + 0xa0] $sequence_7 = { 8b83a0000000 413bc5 0f82c3010000 398388000000 0f87b7010000 8b8b94000000 8b839c000000 } // n = 7, score = 200 // 8b83a0000000 | jne 0xfffffff0 // 413bc5 | dec eax // 0f82c3010000 | mov ecx, edi // 398388000000 | je 0x1f // 0f87b7010000 | dec eax // 8b8b94000000 | mov ebx, dword ptr [ebx + 0x1c] // 8b839c000000 | dec eax $sequence_8 = { 68???????? ff7508 e9???????? 8d85e8feffff 50 8bce 33ff } // n = 7, score = 200 // 68???????? | // ff7508 | test ecx, ecx // e9???????? | // 8d85e8feffff | je 0x1e // 50 | cmp ecx, 1 // 8bce | je 0x1e // 33ff | mov dword ptr [eax], 0x16 $sequence_9 = { 741d 488b5b1c 4885db 75e7 } // n = 4, score = 200 // 741d | pop esi // 488b5b1c | je 0x1f // 4885db | dec eax // 75e7 | mov ebx, dword ptr [ebx + 0x1c] $sequence_10 = { 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_11 = { 8b842480000000 2bc1 4c03c8 413bcb 0f8389000000 } // n = 5, score = 200 // 8b842480000000 | cmp dword ptr [ebx + 0x16f4], eax // 2bc1 | jne 0x4a // 4c03c8 | mov eax, dword ptr [ebx + 0x84] // 413bcb | mov eax, dword ptr [ebx + 0x16f0] // 0f8389000000 | sub eax, esi $sequence_12 = { 8b86f0160000 8bc8 c1e102 894e18 4c396650 } // n = 5, score = 200 // 8b86f0160000 | dec esp // 8bc8 | add ecx, eax // c1e102 | inc ecx // 894e18 | cmp ecx, ebx // 4c396650 | jae 0x97 $sequence_13 = { 837d0800 56 7420 8b35???????? eb14 ff7608 } // n = 6, score = 200 // 837d0800 | je 0x1c // 56 | cmp ecx, 1 // 7420 | je 0x1c // 8b35???????? | // eb14 | cmp ecx, 1 // ff7608 | je 0x1a $sequence_14 = { 8b5e38 8b7e3c 8945ec 8b02 8945fc 8b4204 8945f8 } // n = 7, score = 200 // 8b5e38 | cmp ecx, 1 // 8b7e3c | je 0x1a // 8945ec | mov dword ptr [eax], 0x16 // 8b02 | mov dword ptr [ebp - 0x14], esi // 8945fc | lea eax, [ebp - 0x14] // 8b4204 | push eax // 8945f8 | push 1 condition: 7 of them and filesize < 1676288 }
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