Actor(s): TA413
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rule win_sepulcher_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.sepulcher." 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.sepulcher" 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 = { 58 6a70 66898508feffff 58 6689850afeffff 33c0 } // n = 6, score = 100 // 58 | pop eax // 6a70 | push 0x70 // 66898508feffff | mov word ptr [ebp - 0x1f8], ax // 58 | pop eax // 6689850afeffff | mov word ptr [ebp - 0x1f6], ax // 33c0 | xor eax, eax $sequence_1 = { 83c40c 5d c20c00 55 8bec 8325????????00 83ec28 } // n = 7, score = 100 // 83c40c | add esp, 0xc // 5d | pop ebp // c20c00 | ret 0xc // 55 | push ebp // 8bec | mov ebp, esp // 8325????????00 | // 83ec28 | sub esp, 0x28 $sequence_2 = { 53 ffb664480000 ff15???????? 85c0 74da 8bce 5e } // n = 7, score = 100 // 53 | push ebx // ffb664480000 | push dword ptr [esi + 0x4864] // ff15???????? | // 85c0 | test eax, eax // 74da | je 0xffffffdc // 8bce | mov ecx, esi // 5e | pop esi $sequence_3 = { 50 6a00 8d85f8f7ffff 50 ff15???????? 85c0 7569 } // n = 7, score = 100 // 50 | push eax // 6a00 | push 0 // 8d85f8f7ffff | lea eax, dword ptr [ebp - 0x808] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 7569 | jne 0x6b $sequence_4 = { 68884a0000 56 e8???????? 59 59 8bc6 5e } // n = 7, score = 100 // 68884a0000 | push 0x4a88 // 56 | push esi // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8bc6 | mov eax, esi // 5e | pop esi $sequence_5 = { 58 6a45 59 6a58 6689878a480000 } // n = 5, score = 100 // 58 | pop eax // 6a45 | push 0x45 // 59 | pop ecx // 6a58 | push 0x58 // 6689878a480000 | mov word ptr [edi + 0x488a], ax $sequence_6 = { 8d8554daffff 8bcb 50 8d8558daffff 50 8d855cdaffff } // n = 6, score = 100 // 8d8554daffff | lea eax, dword ptr [ebp - 0x25ac] // 8bcb | mov ecx, ebx // 50 | push eax // 8d8558daffff | lea eax, dword ptr [ebp - 0x25a8] // 50 | push eax // 8d855cdaffff | lea eax, dword ptr [ebp - 0x25a4] $sequence_7 = { c745f40c000000 6af5 8bf1 c745fc01000000 895df8 ff15???????? } // n = 6, score = 100 // c745f40c000000 | mov dword ptr [ebp - 0xc], 0xc // 6af5 | push -0xb // 8bf1 | mov esi, ecx // c745fc01000000 | mov dword ptr [ebp - 4], 1 // 895df8 | mov dword ptr [ebp - 8], ebx // ff15???????? | $sequence_8 = { 55 8bec 8b4508 57 8d3c8558e00110 } // n = 5, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 8b4508 | mov eax, dword ptr [ebp + 8] // 57 | push edi // 8d3c8558e00110 | lea edi, dword ptr [eax*4 + 0x1001e058] $sequence_9 = { 6a08 59 6a08 66a5 } // n = 4, score = 100 // 6a08 | push 8 // 59 | pop ecx // 6a08 | push 8 // 66a5 | movsw word ptr es:[edi], word ptr [esi] condition: 7 of them and filesize < 279552 }
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