Actor(s): Tick
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rule win_datper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8d95bcf7ffff 33c0 e8???????? ffb5bcf7ffff 68???????? 8d85c0f7ffff ba03000000 } // n = 7, score = 200 // 8d95bcf7ffff | lea edx, [ebp - 0x844] // 33c0 | xor eax, eax // e8???????? | // ffb5bcf7ffff | push dword ptr [ebp - 0x844] // 68???????? | // 8d85c0f7ffff | lea eax, [ebp - 0x840] // ba03000000 | mov edx, 3 $sequence_1 = { 8b55f4 e8???????? 8b55d0 b901000000 b8???????? } // n = 5, score = 200 // 8b55f4 | mov edx, dword ptr [ebp - 0xc] // e8???????? | // 8b55d0 | mov edx, dword ptr [ebp - 0x30] // b901000000 | mov ecx, 1 // b8???????? | $sequence_2 = { e8???????? c78588feffff05000000 33c0 89858cfeffff 8b55d0 8b45d4 33c9 } // n = 7, score = 200 // e8???????? | // c78588feffff05000000 | mov dword ptr [ebp - 0x178], 5 // 33c0 | xor eax, eax // 89858cfeffff | mov dword ptr [ebp - 0x174], eax // 8b55d0 | mov edx, dword ptr [ebp - 0x30] // 8b45d4 | mov eax, dword ptr [ebp - 0x2c] // 33c9 | xor ecx, ecx $sequence_3 = { 8bc6 48 740c 48 7521 6a00 e8???????? } // n = 7, score = 200 // 8bc6 | mov eax, esi // 48 | dec eax // 740c | je 0xe // 48 | dec eax // 7521 | jne 0x23 // 6a00 | push 0 // e8???????? | $sequence_4 = { 8b55f0 0fb64de2 c1e106 0fb65de3 0acb 884c1001 } // n = 6, score = 200 // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 0fb64de2 | movzx ecx, byte ptr [ebp - 0x1e] // c1e106 | shl ecx, 6 // 0fb65de3 | movzx ebx, byte ptr [ebp - 0x1d] // 0acb | or cl, bl // 884c1001 | mov byte ptr [eax + edx + 1], cl $sequence_5 = { 8b09 8bd3 8bc3 e8???????? } // n = 4, score = 200 // 8b09 | mov ecx, dword ptr [ecx] // 8bd3 | mov edx, ebx // 8bc3 | mov eax, ebx // e8???????? | $sequence_6 = { 50 e8???????? 50 56 8b4df0 33d2 } // n = 6, score = 200 // 50 | push eax // e8???????? | // 50 | push eax // 56 | push esi // 8b4df0 | mov ecx, dword ptr [ebp - 0x10] // 33d2 | xor edx, edx $sequence_7 = { 740c 48 7521 6a00 } // n = 4, score = 200 // 740c | je 0xe // 48 | dec eax // 7521 | jne 0x23 // 6a00 | push 0 $sequence_8 = { e8???????? 6a00 8d4598 50 8b459c 50 8b45ec } // n = 7, score = 200 // e8???????? | // 6a00 | push 0 // 8d4598 | lea eax, [ebp - 0x68] // 50 | push eax // 8b459c | mov eax, dword ptr [ebp - 0x64] // 50 | push eax // 8b45ec | mov eax, dword ptr [ebp - 0x14] $sequence_9 = { 0f8cbe000000 33c0 8945ec bb01000000 e9???????? 8b75f8 85f6 } // n = 7, score = 200 // 0f8cbe000000 | jl 0xc4 // 33c0 | xor eax, eax // 8945ec | mov dword ptr [ebp - 0x14], eax // bb01000000 | mov ebx, 1 // e9???????? | // 8b75f8 | mov esi, dword ptr [ebp - 8] // 85f6 | test esi, esi condition: 7 of them and filesize < 253952 }
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