Actor(s): Tick
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rule win_datper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" 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 = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 741d 66ffc8 742b e9???????? b800000080 ba03000000 c7431cd0304000 } // n = 7, score = 200 // 741d | je 0x1f // 66ffc8 | dec ax // 742b | je 0x2d // e9???????? | // b800000080 | mov eax, 0x80000000 // ba03000000 | mov edx, 3 // c7431cd0304000 | mov dword ptr [ebx + 0x1c], 0x4030d0 $sequence_1 = { 8b03 e8???????? 8b55dc b8???????? e8???????? 8d45f4 e8???????? } // n = 7, score = 200 // 8b03 | mov eax, dword ptr [ebx] // e8???????? | // 8b55dc | mov edx, dword ptr [ebp - 0x24] // b8???????? | // e8???????? | // 8d45f4 | lea eax, [ebp - 0xc] // e8???????? | $sequence_2 = { 8d8580feffff e8???????? c78588feffff02000000 33c0 89858cfeffff 8b55d0 8b45d4 } // n = 7, score = 200 // 8d8580feffff | lea eax, [ebp - 0x180] // e8???????? | // c78588feffff02000000 | mov dword ptr [ebp - 0x178], 2 // 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] $sequence_3 = { 46 83fb03 75dd 0fb6442414 c1e802 88442417 0fb6442414 } // n = 7, score = 200 // 46 | inc esi // 83fb03 | cmp ebx, 3 // 75dd | jne 0xffffffdf // 0fb6442414 | movzx eax, byte ptr [esp + 0x14] // c1e802 | shr eax, 2 // 88442417 | mov byte ptr [esp + 0x17], al // 0fb6442414 | movzx eax, byte ptr [esp + 0x14] $sequence_4 = { 8bc3 b20d e8???????? 8bc3 b20a e8???????? } // n = 6, score = 200 // 8bc3 | mov eax, ebx // b20d | mov dl, 0xd // e8???????? | // 8bc3 | mov eax, ebx // b20a | mov dl, 0xa // e8???????? | $sequence_5 = { 740c 8b03 50 e8???????? 85c0 7510 } // n = 6, score = 200 // 740c | je 0xe // 8b03 | mov eax, dword ptr [ebx] // 50 | push eax // e8???????? | // 85c0 | test eax, eax // 7510 | jne 0x12 $sequence_6 = { e8???????? 8bf0 81fe03010000 7e0f b803000000 } // n = 5, score = 200 // e8???????? | // 8bf0 | mov esi, eax // 81fe03010000 | cmp esi, 0x103 // 7e0f | jle 0x11 // b803000000 | mov eax, 3 $sequence_7 = { 50 53 e8???????? a3???????? 8d55e8 b8???????? } // n = 6, score = 200 // 50 | push eax // 53 | push ebx // e8???????? | // a3???????? | // 8d55e8 | lea edx, [ebp - 0x18] // b8???????? | $sequence_8 = { a1???????? e8???????? 50 a1???????? 0582000000 50 e8???????? } // n = 7, score = 200 // a1???????? | // e8???????? | // 50 | push eax // a1???????? | // 0582000000 | add eax, 0x82 // 50 | push eax // e8???????? | $sequence_9 = { 6880000000 6a02 6a00 6a02 6800000040 8b45f4 e8???????? } // n = 7, score = 200 // 6880000000 | push 0x80 // 6a02 | push 2 // 6a00 | push 0 // 6a02 | push 2 // 6800000040 | push 0x40000000 // 8b45f4 | mov eax, dword ptr [ebp - 0xc] // e8???????? | condition: 7 of them and filesize < 253952 }
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