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rule win_sappycache_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 488d8c24c0060000 e8???????? 488d542440 488bcf ff15???????? 85c0 0f852fffffff } // n = 7, score = 200 // 488d8c24c0060000 | mov ebx, 0xe3 // e8???????? | // 488d542440 | inc ebx // 488bcf | lea eax, [ebx + edx] // ff15???????? | // 85c0 | inc ecx // 0f852fffffff | push esi $sequence_1 = { 488be9 33d2 488d8c24c0060000 41b800000400 } // n = 4, score = 200 // 488be9 | dec eax // 33d2 | lea edi, [0x1140f] // 488d8c24c0060000 | je 0x4b // 41b800000400 | dec eax $sequence_2 = { 4883ec20 488bf9 4c8d0d086e0000 b903000000 } // n = 4, score = 200 // 4883ec20 | cmp edi, edx // 488bf9 | jl 0xfffffefa // 4c8d0d086e0000 | dec esp // b903000000 | lea ecx, [0x130bc] $sequence_3 = { ff15???????? 488d15fb1a0100 488d0d24650100 ff15???????? } // n = 4, score = 200 // ff15???????? | // 488d15fb1a0100 | jne 0xffffff37 // 488d0d24650100 | dec eax // ff15???????? | $sequence_4 = { ff15???????? 49ffc7 47382c3c 75f7 4d8bcc } // n = 5, score = 200 // ff15???????? | // 49ffc7 | mov ebp, 4 // 47382c3c | dec esp // 75f7 | lea ebx, [eax + eax*2] // 4d8bcc | dec ecx $sequence_5 = { 4533c9 33d2 41b800800000 e8???????? 488b3b 488bcb e8???????? } // n = 7, score = 200 // 4533c9 | cmp esi, eax // 33d2 | jl 0x8d // 41b800800000 | dec esp // e8???????? | // 488b3b | lea edi, [0xfab7] // 488bcb | dec ecx // e8???????? | $sequence_6 = { ff15???????? 33c0 e9???????? 4c89ac24a8000000 488d0c2e 49bd00000000ffffffff } // n = 6, score = 200 // ff15???????? | // 33c0 | inc ebp // e9???????? | // 4c89ac24a8000000 | xor ecx, ecx // 488d0c2e | inc ebp // 49bd00000000ffffffff | xor eax, eax $sequence_7 = { 89442438 0fb75106 443bfa 0f8cd3feffff 4c8d0dbc300100 4d85d2 746c } // n = 7, score = 200 // 89442438 | dec eax // 0fb75106 | mov dword ptr [edi + 0x30], eax // 443bfa | dec eax // 0f8cd3feffff | lea eax, [0xfffffca6] // 4c8d0dbc300100 | dec eax // 4d85d2 | mov dword ptr [edi + 0x38], eax // 746c | dec eax $sequence_8 = { 3b15???????? 7350 488bca 4c8d0595e00000 83e13f 488bc2 } // n = 6, score = 200 // 3b15???????? | // 7350 | mov edi, dword ptr [esp + 0x6388] // 488bca | ret // 4c8d0595e00000 | inc eax // 83e13f | push edi // 488bc2 | dec eax $sequence_9 = { 488bd5 ff15???????? 488bf0 4885c0 752d 448d4804 41b800300000 } // n = 7, score = 200 // 488bd5 | inc ebp // ff15???????? | // 488bf0 | xor edi, edi // 4885c0 | inc ecx // 752d | mov ebx, edi // 448d4804 | dec esp // 41b800300000 | lea ecx, [0xffffbb0e] condition: 7 of them and filesize < 262144 }
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