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rule win_sappycache_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 488d8c2484020000 41b834040000 e8???????? 488d942480020000 c784248002000038040000 488bcb } // n = 6, score = 200 // 488d8c2484020000 | lea edx, [0xe430] // 41b834040000 | dec eax // e8???????? | // 488d942480020000 | mov eax, ecx // c784248002000038040000 | and ecx, 0x3f // 488bcb | dec eax $sequence_1 = { 33ed 4c8d35266e0000 448bd5 488bf1 41bbe3000000 438d0413 } // n = 6, score = 200 // 33ed | dec esp // 4c8d35266e0000 | lea eax, [0x9040] // 448bd5 | dec eax // 488bf1 | lea edx, [0x9041] // 41bbe3000000 | dec esp // 438d0413 | lea ecx, [0x6d69] $sequence_2 = { 4863c9 488d1556fa0000 488bc1 83e13f 48c1f806 } // n = 5, score = 200 // 4863c9 | mov edi, edi // 488d1556fa0000 | test ebp, ebp // 488bc1 | cmove eax, ecx // 83e13f | dec eax // 48c1f806 | mov ecx, edi $sequence_3 = { e9???????? 488d156ba20000 488d0d54a20000 e8???????? c705????????02000000 } // n = 5, score = 200 // e9???????? | // 488d156ba20000 | dec eax // 488d0d54a20000 | lea ebx, [0x11516] // e8???????? | // c705????????02000000 | $sequence_4 = { b906000000 48898620020000 0fb7c0 66f3ab 488d3dbcf40000 } // n = 5, score = 200 // b906000000 | dec esp // 48898620020000 | xor ecx, edx // 0fb7c0 | dec eax // 66f3ab | cmp ecx, eax // 488d3dbcf40000 | dec eax $sequence_5 = { 817c242000140000 0f8592000000 488d05b8600100 b928000000 0f1f00 } // n = 5, score = 200 // 817c242000140000 | mov ecx, 0x68 // 0f8592000000 | dec eax // 488d05b8600100 | mov ecx, esi // b928000000 | dec ecx // 0f1f00 | or edi, 0xffffffff $sequence_6 = { e8???????? 418bcc 48897de0 e8???????? 85c0 0f8401010000 488d05efd80000 } // n = 7, score = 200 // e8???????? | // 418bcc | add eax, eax // 48897de0 | dec eax // e8???????? | // 85c0 | lea ecx, [0x5306] // 0f8401010000 | mov eax, dword ptr [ecx + eax*8] // 488d05efd80000 | js 0x436 $sequence_7 = { 498784f130800100 eb25 488bc3 498784f130800100 4885c0 7410 } // n = 6, score = 200 // 498784f130800100 | lea edx, [ebx + 8] // eb25 | dec eax // 488bc3 | sub esp, 0x20 // 498784f130800100 | dec eax // 4885c0 | mov ebx, ecx // 7410 | dec eax $sequence_8 = { 75f7 4c8d4530 488d8d30060000 e8???????? 33c0 } // n = 5, score = 200 // 75f7 | mov ecx, ebx // 4c8d4530 | mov eax, dword ptr [ebp - 0x80] // 488d8d30060000 | dec eax // e8???????? | // 33c0 | mov ebx, esi $sequence_9 = { 488bd5 ff15???????? 488bf0 4885c0 752d 448d4804 41b800300000 } // n = 7, score = 200 // 488bd5 | lea eax, [eax + 0x80] // ff15???????? | // 488bf0 | je 0xbf // 4885c0 | mov esi, dword ptr [ebp] // 752d | dec ecx // 448d4804 | mov ebx, dword ptr [edi + esi*8 + 0x18620] // 41b800300000 | dec eax condition: 7 of them and filesize < 262144 }
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