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rule win_regretlocker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.regretlocker." 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.regretlocker" 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 = { 74ba 83f807 77c5 ff248568714300 8bce e8???????? eb45 } // n = 7, score = 100 // 74ba | je 0xffffffbc // 83f807 | cmp eax, 7 // 77c5 | ja 0xffffffc7 // ff248568714300 | jmp dword ptr [eax*4 + 0x437168] // 8bce | mov ecx, esi // e8???????? | // eb45 | jmp 0x47 $sequence_1 = { 56 53 50 e8???????? 83c40c 8d45ec 50 } // n = 7, score = 100 // 56 | push esi // 53 | push ebx // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax $sequence_2 = { 50 895e10 895e14 e8???????? 8d4dd8 e8???????? 8bc6 } // n = 7, score = 100 // 50 | push eax // 895e10 | mov dword ptr [esi + 0x10], ebx // 895e14 | mov dword ptr [esi + 0x14], ebx // e8???????? | // 8d4dd8 | lea ecx, [ebp - 0x28] // e8???????? | // 8bc6 | mov eax, esi $sequence_3 = { 8d4e10 89442408 8d442408 50 e8???????? 8d4804 } // n = 6, score = 100 // 8d4e10 | lea ecx, [esi + 0x10] // 89442408 | mov dword ptr [esp + 8], eax // 8d442408 | lea eax, [esp + 8] // 50 | push eax // e8???????? | // 8d4804 | lea ecx, [eax + 4] $sequence_4 = { 8bce e8???????? 8b45fc ff75f0 894610 8b4304 83c014 } // n = 7, score = 100 // 8bce | mov ecx, esi // e8???????? | // 8b45fc | mov eax, dword ptr [ebp - 4] // ff75f0 | push dword ptr [ebp - 0x10] // 894610 | mov dword ptr [esi + 0x10], eax // 8b4304 | mov eax, dword ptr [ebx + 4] // 83c014 | add eax, 0x14 $sequence_5 = { c9 c21800 8a410d c3 55 8bec ff7114 } // n = 7, score = 100 // c9 | leave // c21800 | ret 0x18 // 8a410d | mov al, byte ptr [ecx + 0xd] // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // ff7114 | push dword ptr [ecx + 0x14] $sequence_6 = { 5b 8be5 5d c21400 55 8bec 81eccc040000 } // n = 7, score = 100 // 5b | pop ebx // 8be5 | mov esp, ebp // 5d | pop ebp // c21400 | ret 0x14 // 55 | push ebp // 8bec | mov ebp, esp // 81eccc040000 | sub esp, 0x4cc $sequence_7 = { 59 68???????? e9???????? 0f28c1 f20f5e45e4 660f2fc2 } // n = 6, score = 100 // 59 | pop ecx // 68???????? | // e9???????? | // 0f28c1 | movaps xmm0, xmm1 // f20f5e45e4 | divsd xmm0, qword ptr [ebp - 0x1c] // 660f2fc2 | comisd xmm0, xmm2 $sequence_8 = { 81ec9c010000 8b4508 53 56 8bf1 57 8975fc } // n = 7, score = 100 // 81ec9c010000 | sub esp, 0x19c // 8b4508 | mov eax, dword ptr [ebp + 8] // 53 | push ebx // 56 | push esi // 8bf1 | mov esi, ecx // 57 | push edi // 8975fc | mov dword ptr [ebp - 4], esi $sequence_9 = { 8d4e24 e8???????? 8d4e04 e8???????? c7066c920010 5e c3 } // n = 7, score = 100 // 8d4e24 | lea ecx, [esi + 0x24] // e8???????? | // 8d4e04 | lea ecx, [esi + 4] // e8???????? | // c7066c920010 | mov dword ptr [esi], 0x1000926c // 5e | pop esi // c3 | ret condition: 7 of them and filesize < 1021952 }
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