Actor(s): Silence group
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rule win_atmosphere_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { 83ec14 56 8b7104 85f6 } // n = 4, score = 400 // 83ec14 | sub esp, 0x14 // 56 | push esi // 8b7104 | mov esi, dword ptr [ecx + 4] // 85f6 | test esi, esi $sequence_1 = { 88460e 33c0 894612 894616 89461a 884e1e } // n = 6, score = 400 // 88460e | mov byte ptr [esi + 0xe], al // 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_2 = { 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_3 = { 8bcf ff5338 5f 5e } // n = 4, score = 400 // 8bcf | mov ecx, edi // ff5338 | call dword ptr [ebx + 0x38] // 5f | pop edi // 5e | pop esi $sequence_4 = { c645fc02 8bcc 8965e8 50 51 e8???????? } // n = 6, score = 400 // c645fc02 | mov byte ptr [ebp - 4], 2 // 8bcc | mov ecx, esp // 8965e8 | mov dword ptr [ebp - 0x18], esp // 50 | push eax // 51 | push ecx // e8???????? | $sequence_5 = { 8bce 8975e8 8806 ff15???????? } // n = 4, score = 400 // 8bce | mov ecx, esi // 8975e8 | mov dword ptr [ebp - 0x18], esi // 8806 | mov byte ptr [esi], al // ff15???????? | $sequence_6 = { 8bc4 89642410 50 e8???????? } // n = 4, score = 400 // 8bc4 | mov eax, esp // 89642410 | mov dword ptr [esp + 0x10], esp // 50 | push eax // e8???????? | $sequence_7 = { 8b7c240c 8bf1 57 ff15???????? 8b470c } // n = 5, score = 400 // 8b7c240c | mov edi, dword ptr [esp + 0xc] // 8bf1 | mov esi, ecx // 57 | push edi // ff15???????? | // 8b470c | mov eax, dword ptr [edi + 0xc] $sequence_8 = { 51 83ec10 8bc4 89642410 50 e8???????? } // n = 6, score = 400 // 51 | push ecx // 83ec10 | sub esp, 0x10 // 8bc4 | mov eax, esp // 89642410 | mov dword ptr [esp + 0x10], esp // 50 | push eax // e8???????? | $sequence_9 = { 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 condition: 7 of them and filesize < 360448 }
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