Actor(s): Tick
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rule win_datper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.datper." 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.datper" 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 = { 33c9 ba0c000000 e8???????? c78564d7ffff0c000000 33c0 898568d7ffff } // n = 6, score = 200 // 33c9 | xor ecx, ecx // ba0c000000 | mov edx, 0xc // e8???????? | // c78564d7ffff0c000000 | mov dword ptr [ebp - 0x289c], 0xc // 33c0 | xor eax, eax // 898568d7ffff | mov dword ptr [ebp - 0x2898], eax $sequence_1 = { 5a 59 59 648910 68???????? 8d85e8f3ffff } // n = 6, score = 200 // 5a | pop edx // 59 | pop ecx // 59 | pop ecx // 648910 | mov dword ptr fs:[eax], edx // 68???????? | // 8d85e8f3ffff | lea eax, [ebp - 0xc18] $sequence_2 = { 0fb607 8845f7 0fb6c1 8b55fc 0fb60402 8807 } // n = 6, score = 200 // 0fb607 | movzx eax, byte ptr [edi] // 8845f7 | mov byte ptr [ebp - 9], al // 0fb6c1 | movzx eax, cl // 8b55fc | mov edx, dword ptr [ebp - 4] // 0fb60402 | movzx eax, byte ptr [edx + eax] // 8807 | mov byte ptr [edi], al $sequence_3 = { 50 ff15???????? 85c0 741f 8b8424a80d0000 894348 } // n = 6, score = 200 // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 741f | je 0x21 // 8b8424a80d0000 | mov eax, dword ptr [esp + 0xda8] // 894348 | mov dword ptr [ebx + 0x48], eax $sequence_4 = { 895de4 895de8 895df4 894df0 8955f8 8945fc 8d45fc } // n = 7, score = 200 // 895de4 | mov dword ptr [ebp - 0x1c], ebx // 895de8 | mov dword ptr [ebp - 0x18], ebx // 895df4 | mov dword ptr [ebp - 0xc], ebx // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8955f8 | mov dword ptr [ebp - 8], edx // 8945fc | mov dword ptr [ebp - 4], eax // 8d45fc | lea eax, [ebp - 4] $sequence_5 = { 53 e8???????? a3???????? 8d95a8fbffff b8???????? e8???????? 8b85a8fbffff } // n = 7, score = 200 // 53 | push ebx // e8???????? | // a3???????? | // 8d95a8fbffff | lea edx, [ebp - 0x458] // b8???????? | // e8???????? | // 8b85a8fbffff | mov eax, dword ptr [ebp - 0x458] $sequence_6 = { c78568d7ffff0c000000 33c0 89856cd7ffff c78570d7ffffffffffff 6a00 6a01 8d8568d7ffff } // n = 7, score = 200 // c78568d7ffff0c000000 | mov dword ptr [ebp - 0x2898], 0xc // 33c0 | xor eax, eax // 89856cd7ffff | mov dword ptr [ebp - 0x2894], eax // c78570d7ffffffffffff | mov dword ptr [ebp - 0x2890], 0xffffffff // 6a00 | push 0 // 6a01 | push 1 // 8d8568d7ffff | lea eax, [ebp - 0x2898] $sequence_7 = { 8b45fc e8???????? 50 e8???????? 8d8564d7ffff 33c9 ba0c000000 } // n = 7, score = 200 // 8b45fc | mov eax, dword ptr [ebp - 4] // e8???????? | // 50 | push eax // e8???????? | // 8d8564d7ffff | lea eax, [ebp - 0x289c] // 33c9 | xor ecx, ecx // ba0c000000 | mov edx, 0xc $sequence_8 = { 8d85f0fbffff 50 53 e8???????? 8945f0 a1???????? 50 } // n = 7, score = 200 // 8d85f0fbffff | lea eax, [ebp - 0x410] // 50 | push eax // 53 | push ebx // e8???????? | // 8945f0 | mov dword ptr [ebp - 0x10], eax // a1???????? | // 50 | push eax $sequence_9 = { 53 e8???????? 6800800000 6a00 56 } // n = 5, score = 200 // 53 | push ebx // e8???????? | // 6800800000 | push 0x8000 // 6a00 | push 0 // 56 | push esi condition: 7 of them and filesize < 253952 }
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