Actor(s): Silence group
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rule win_atmosphere_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.atmosphere." 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.atmosphere" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 6a12 50 8b11 ff12 } // n = 4, score = 400 // 6a12 | push 0x12 // 50 | push eax // 8b11 | mov edx, dword ptr [ecx] // ff12 | call dword ptr [edx] $sequence_1 = { e8???????? 8b4604 85c0 7504 33f6 eb08 } // n = 6, score = 400 // e8???????? | // 8b4604 | mov eax, dword ptr [esi + 4] // 85c0 | test eax, eax // 7504 | jne 6 // 33f6 | xor esi, esi // eb08 | jmp 0xa $sequence_2 = { 56 57 8b7c240c 8bf1 57 ff15???????? 8b470c } // n = 7, score = 400 // 56 | push esi // 57 | push edi // 8b7c240c | mov edi, dword ptr [esp + 0xc] // 8bf1 | mov esi, ecx // 57 | push edi // ff15???????? | // 8b470c | mov eax, dword ptr [edi + 0xc] $sequence_3 = { 33c0 894612 894616 89461a 884e1e } // n = 5, score = 400 // 33c0 | xor eax, eax // 894612 | mov dword ptr [esi + 0x12], eax // 894616 | mov dword ptr [esi + 0x16], eax // 89461a | mov dword ptr [esi + 0x1a], eax // 884e1e | mov byte ptr [esi + 0x1e], cl $sequence_4 = { 56 8bf1 8b06 ff5074 } // n = 4, score = 400 // 56 | push esi // 8bf1 | mov esi, ecx // 8b06 | mov eax, dword ptr [esi] // ff5074 | call dword ptr [eax + 0x74] $sequence_5 = { 57 8d45e0 8965f0 8bf1 50 } // n = 5, score = 400 // 57 | push edi // 8d45e0 | lea eax, dword ptr [ebp - 0x20] // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8bf1 | mov esi, ecx // 50 | push eax $sequence_6 = { e8???????? 83ec10 c645fc02 8bcc 8965e8 } // n = 5, score = 400 // e8???????? | // 83ec10 | sub esp, 0x10 // c645fc02 | mov byte ptr [ebp - 4], 2 // 8bcc | mov ecx, esp // 8965e8 | mov dword ptr [ebp - 0x18], esp $sequence_7 = { 8bf1 57 ff15???????? 8b470c } // n = 4, score = 400 // 8bf1 | mov esi, ecx // 57 | push edi // ff15???????? | // 8b470c | mov eax, dword ptr [edi + 0xc] $sequence_8 = { 8bcc 8965e8 50 51 } // n = 4, score = 400 // 8bcc | mov ecx, esp // 8965e8 | mov dword ptr [ebp - 0x18], esp // 50 | push eax // 51 | push ecx $sequence_9 = { 8b5104 668b0402 8b542404 668902 } // n = 4, score = 400 // 8b5104 | mov edx, dword ptr [ecx + 4] // 668b0402 | mov ax, word ptr [edx + eax] // 8b542404 | mov edx, dword ptr [esp + 4] // 668902 | mov word ptr [edx], ax condition: 7 of them and filesize < 360448 }
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