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rule win_sappycache_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 448bcf 895c2428 33d2 33c9 4889442420 488bf0 ff15???????? } // n = 7, score = 200 // 448bcf | jmp 0x34f // 895c2428 | jmp 0x2dc // 33d2 | dec eax // 33c9 | ror edi, cl // 4889442420 | dec eax // 488bf0 | lea ecx, [0xffffba5a] // ff15???????? | $sequence_1 = { ff15???????? 85c0 7428 488bcd 488d1545f80000 } // n = 5, score = 200 // ff15???????? | // 85c0 | lea ecx, [0x12b41] // 7428 | dec eax // 488bcd | lea ecx, [0x1614c] // 488d1545f80000 | dec eax $sequence_2 = { 488b8188000000 488d0d16fa0000 4883c018 7452 8bd7 0f1000 } // n = 6, score = 200 // 488b8188000000 | movups xmm0, xmmword ptr [ebx] // 488d0d16fa0000 | dec eax // 4883c018 | lea ebx, [ebx + 0x80] // 7452 | movups xmmword ptr [eax - 0x80], xmm0 // 8bd7 | movups xmm1, xmmword ptr [ebx - 0x70] // 0f1000 | nop dword ptr [eax] $sequence_3 = { ff15???????? 41b904000000 c7452060ea0000 4c8d4520 } // n = 4, score = 200 // ff15???????? | // 41b904000000 | dec esp // c7452060ea0000 | lea eax, [esp + 0x24] // 4c8d4520 | dec eax $sequence_4 = { 4c8d0dd6860000 c5f35cca c4c173590cc1 4c8d0da5760000 c5f359c1 } // n = 5, score = 200 // 4c8d0dd6860000 | xor ecx, ecx // c5f35cca | dec eax // c4c173590cc1 | add eax, 0x24 // 4c8d0da5760000 | mov dword ptr [eax], edi // c5f359c1 | dec eax $sequence_5 = { 49ffc0 47382c04 75f7 488d157c1f0100 } // n = 4, score = 200 // 49ffc0 | or edi, 0xffffffff // 47382c04 | dec eax // 75f7 | lea eax, [ebp + 0x240] // 488d157c1f0100 | dec eax $sequence_6 = { 4c89742430 448bcf 895c2428 33d2 33c9 4889442420 } // n = 6, score = 200 // 4c89742430 | xor eax, eax // 448bcf | xor ecx, ecx // 895c2428 | inc ecx // 33d2 | lea edx, [ecx + 0x5f] // 33c9 | inc ecx // 4889442420 | mov ecx, 4 $sequence_7 = { f20f1000 8b7808 e9???????? 488d05eed70000 4a8b0ce8 42f644313880 744d } // n = 7, score = 200 // f20f1000 | lea eax, [ebp + 0x24] // 8b7808 | dec eax // e9???????? | // 488d05eed70000 | mov dword ptr [esp + 0x28], eax // 4a8b0ce8 | dec eax // 42f644313880 | lea edx, [0x11f86] // 744d | dec eax $sequence_8 = { 4c8d0d136d0000 8bf9 488d15ba4d0000 b906000000 4c8d05f66c0000 e8???????? } // n = 6, score = 200 // 4c8d0d136d0000 | dec eax // 8bf9 | add edx, eax // 488d15ba4d0000 | dec eax // b906000000 | mov dword ptr [esp + 0x98], ebp // 4c8d05f66c0000 | inc ecx // e8???????? | $sequence_9 = { 4180e003 80e30f 41c0e004 440ac0 } // n = 4, score = 200 // 4180e003 | lea ecx, [ebx + ebx*4] // 80e30f | xor ebx, ebx // 41c0e004 | dec eax // 440ac0 | lea edi, [0xf6ad] condition: 7 of them and filesize < 262144 }
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