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rule win_rtpos_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" 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 = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 0f8536010000 837db000 750b 8b45bc 83c001 8945bc eb09 } // n = 7, score = 100 // 0f8536010000 | jne 0x13c // 837db000 | cmp dword ptr [ebp - 0x50], 0 // 750b | jne 0xd // 8b45bc | mov eax, dword ptr [ebp - 0x44] // 83c001 | add eax, 1 // 8945bc | mov dword ptr [ebp - 0x44], eax // eb09 | jmp 0xb $sequence_1 = { 6a04 6800300000 6800500600 6a00 ff15???????? 8b8d3cf9ffff 898170020000 } // n = 7, score = 100 // 6a04 | push 4 // 6800300000 | push 0x3000 // 6800500600 | push 0x65000 // 6a00 | push 0 // ff15???????? | // 8b8d3cf9ffff | mov ecx, dword ptr [ebp - 0x6c4] // 898170020000 | mov dword ptr [ecx + 0x270], eax $sequence_2 = { 8d45f4 64a300000000 64a12c000000 8b08 8b15???????? } // n = 5, score = 100 // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 64a12c000000 | mov eax, dword ptr fs:[0x2c] // 8b08 | mov ecx, dword ptr [eax] // 8b15???????? | $sequence_3 = { 50 ff15???????? 0345ac 8945ac } // n = 4, score = 100 // 50 | push eax // ff15???????? | // 0345ac | add eax, dword ptr [ebp - 0x54] // 8945ac | mov dword ptr [ebp - 0x54], eax $sequence_4 = { 50 8d45f4 64a300000000 837d0801 0f8eb1000000 b804000000 c1e000 } // n = 7, score = 100 // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 837d0801 | cmp dword ptr [ebp + 8], 1 // 0f8eb1000000 | jle 0xb7 // b804000000 | mov eax, 4 // c1e000 | shl eax, 0 $sequence_5 = { 83e03f c1fa06 6bc830 8b0495b86a4300 f644082801 7414 } // n = 6, score = 100 // 83e03f | and eax, 0x3f // c1fa06 | sar edx, 6 // 6bc830 | imul ecx, eax, 0x30 // 8b0495b86a4300 | mov eax, dword ptr [edx*4 + 0x436ab8] // f644082801 | test byte ptr [eax + ecx + 0x28], 1 // 7414 | je 0x16 $sequence_6 = { 6804010000 8d85f4fdffff 50 6a00 ff15???????? 85c0 751e } // n = 7, score = 100 // 6804010000 | push 0x104 // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax // 6a00 | push 0 // ff15???????? | // 85c0 | test eax, eax // 751e | jne 0x20 $sequence_7 = { 3b0cc5988d4200 7427 40 83f82d 72f1 8d41ed } // n = 6, score = 100 // 3b0cc5988d4200 | cmp ecx, dword ptr [eax*8 + 0x428d98] // 7427 | je 0x29 // 40 | inc eax // 83f82d | cmp eax, 0x2d // 72f1 | jb 0xfffffff3 // 8d41ed | lea eax, [ecx - 0x13] $sequence_8 = { c745fc00000000 8d4df0 e8???????? 8bf0 8d4df0 e8???????? } // n = 6, score = 100 // c745fc00000000 | mov dword ptr [ebp - 4], 0 // 8d4df0 | lea ecx, [ebp - 0x10] // e8???????? | // 8bf0 | mov esi, eax // 8d4df0 | lea ecx, [ebp - 0x10] // e8???????? | $sequence_9 = { 8b9168020000 52 ff15???????? 85c0 7563 8b45b8 50 } // n = 7, score = 100 // 8b9168020000 | mov edx, dword ptr [ecx + 0x268] // 52 | push edx // ff15???????? | // 85c0 | test eax, eax // 7563 | jne 0x65 // 8b45b8 | mov eax, dword ptr [ebp - 0x48] // 50 | push eax condition: 7 of them and filesize < 507904 }
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