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rule win_sappycache_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.sappycache." 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.sappycache" 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 = { 0f1f440000 33d2 488d8d20420000 41b800200000 } // n = 4, score = 200 // 0f1f440000 | jne 0xffffffb3 // 33d2 | dec eax // 488d8d20420000 | mov ecx, edi // 41b800200000 | nop dword ptr [eax] $sequence_1 = { 4c8d05bd6c0000 488bf9 488d155b4d0000 b914000000 e8???????? 488bf0 } // n = 6, score = 200 // 4c8d05bd6c0000 | dec eax // 488bf9 | mov esi, eax // 488d155b4d0000 | inc ecx // b914000000 | mov ecx, 4 // e8???????? | // 488bf0 | mov dword ptr [ebp + 0x20], 0xea60 $sequence_2 = { 488bd9 488bc2 488d0d5d9a0000 48890b 488d5308 33c9 48890a } // n = 7, score = 200 // 488bd9 | dec eax // 488bc2 | add ebx, 8 // 488d0d5d9a0000 | dec eax // 48890b | lea eax, [0xfb00] // 488d5308 | dec eax // 33c9 | cmp ebx, eax // 48890a | jne 0xffffffe4 $sequence_3 = { 4883ec20 448bf1 4c8d3dee79ffff 4d8be1 498be8 4c8bea 4b8b8cf7c0860100 } // n = 7, score = 200 // 4883ec20 | dec esp // 448bf1 | lea ecx, [ebp - 0x50] // 4c8d3dee79ffff | inc ebp // 4d8be1 | xor eax, eax // 498be8 | dec eax // 4c8bea | lea ecx, [ebp + 0x240] // 4b8b8cf7c0860100 | dec eax $sequence_4 = { 482be0 488b05???????? 4833c4 48898424c0060400 488be9 33d2 } // n = 6, score = 200 // 482be0 | jae 0xa4 // 488b05???????? | // 4833c4 | dec eax // 48898424c0060400 | mov edi, ebx // 488be9 | dec esp // 33d2 | lea esi, [0xf9ea] $sequence_5 = { ff15???????? 488b4d88 ff15???????? 488d8540010000 498bd7 48ffc2 } // n = 6, score = 200 // ff15???????? | // 488b4d88 | test eax, eax // ff15???????? | // 488d8540010000 | je 0x187 // 498bd7 | dec esp // 48ffc2 | lea eax, [esp + 0x4b0] $sequence_6 = { b908000000 4c8d058b6a0000 488d158c6a0000 e8???????? 488bf8 4885c0 7428 } // n = 7, score = 200 // b908000000 | sar eax, 6 // 4c8d058b6a0000 | dec eax // 488d158c6a0000 | shl ecx, 6 // e8???????? | // 488bf8 | dec ecx // 4885c0 | mov eax, dword ptr [eax + eax*8] // 7428 | dec eax $sequence_7 = { 895128 488d0daf750000 488b45d8 488908 488d0d31070100 } // n = 5, score = 200 // 895128 | mov edi, dword ptr [esp + 0x88] // 488d0daf750000 | dec eax // 488b45d8 | mov ecx, dword ptr [esp + 0x50] // 488908 | dec eax // 488d0d31070100 | xor ecx, esp $sequence_8 = { 83e03f 458bc8 2bc8 488d05d8380100 49d3c9 } // n = 5, score = 200 // 83e03f | mov dword ptr [esp + 0x6338], esi // 458bc8 | dec esp // 2bc8 | lea esi, [0x12204] // 488d05d8380100 | dec ecx // 49d3c9 | mov edx, esi $sequence_9 = { c7452400010000 b940000000 4c896d30 ff15???????? 488d5524 } // n = 5, score = 200 // c7452400010000 | lea ecx, [0x9abd] // b940000000 | dec eax // 4c896d30 | mov dword ptr [ebx], ecx // ff15???????? | // 488d5524 | dec eax condition: 7 of them and filesize < 262144 }
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