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rule win_rtpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rtpos." 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.rtpos" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { c700???????? 8b4d08 51 8b55f0 } // n = 4, score = 100 // c700???????? | // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // 8b55f0 | mov edx, dword ptr [ebp - 0x10] $sequence_1 = { 51 ff15???????? e9???????? ff15???????? 8945c4 8b55ec 8955c8 } // n = 7, score = 100 // 51 | push ecx // ff15???????? | // e9???????? | // ff15???????? | // 8945c4 | mov dword ptr [ebp - 0x3c], eax // 8b55ec | mov edx, dword ptr [ebp - 0x14] // 8955c8 | mov dword ptr [ebp - 0x38], edx $sequence_2 = { eb9a c745f400000000 837dc800 0f8696000000 837df400 740e 8b4df4 } // n = 7, score = 100 // eb9a | jmp 0xffffff9c // c745f400000000 | mov dword ptr [ebp - 0xc], 0 // 837dc800 | cmp dword ptr [ebp - 0x38], 0 // 0f8696000000 | jbe 0x9c // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 740e | je 0x10 // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_3 = { 52 8b4508 8b88a4040000 51 ff15???????? 8985b8fcffff 8b4dfc } // n = 7, score = 100 // 52 | push edx // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b88a4040000 | mov ecx, dword ptr [eax + 0x4a4] // 51 | push ecx // ff15???????? | // 8985b8fcffff | mov dword ptr [ebp - 0x348], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_4 = { 85c0 7507 b801000000 eb0d 8b45fc 83c001 8945fc } // n = 7, score = 100 // 85c0 | test eax, eax // 7507 | jne 9 // b801000000 | mov eax, 1 // eb0d | jmp 0xf // 8b45fc | mov eax, dword ptr [ebp - 4] // 83c001 | add eax, 1 // 8945fc | mov dword ptr [ebp - 4], eax $sequence_5 = { 8b55d8 52 ff15???????? 8945dc 837ddc00 } // n = 5, score = 100 // 8b55d8 | mov edx, dword ptr [ebp - 0x28] // 52 | push edx // ff15???????? | // 8945dc | mov dword ptr [ebp - 0x24], eax // 837ddc00 | cmp dword ptr [ebp - 0x24], 0 $sequence_6 = { 8b45bc 50 8b4dac e8???????? 8945b4 837db4ff } // n = 6, score = 100 // 8b45bc | mov eax, dword ptr [ebp - 0x44] // 50 | push eax // 8b4dac | mov ecx, dword ptr [ebp - 0x54] // e8???????? | // 8945b4 | mov dword ptr [ebp - 0x4c], eax // 837db4ff | cmp dword ptr [ebp - 0x4c], -1 $sequence_7 = { 6800300000 8b85e4fdffff 50 6a00 ff15???????? } // n = 5, score = 100 // 6800300000 | push 0x3000 // 8b85e4fdffff | mov eax, dword ptr [ebp - 0x21c] // 50 | push eax // 6a00 | push 0 // ff15???????? | $sequence_8 = { 8b4dd0 894dcc c745fc00000000 8b55cc 52 8b4dd4 } // n = 6, score = 100 // 8b4dd0 | mov ecx, dword ptr [ebp - 0x30] // 894dcc | mov dword ptr [ebp - 0x34], ecx // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8b55cc | mov edx, dword ptr [ebp - 0x34] // 52 | push edx // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] $sequence_9 = { 8bc8 d1f9 6a41 5f 894df0 8b34cd98c64200 } // n = 6, score = 100 // 8bc8 | mov ecx, eax // d1f9 | sar ecx, 1 // 6a41 | push 0x41 // 5f | pop edi // 894df0 | mov dword ptr [ebp - 0x10], ecx // 8b34cd98c64200 | mov esi, dword ptr [ecx*8 + 0x42c698] condition: 7 of them and filesize < 507904 }
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