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rule win_isaacwiper_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.isaacwiper." 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.isaacwiper" 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 = { 3bca 7614 2bf9 8bc2 0f1f440000 8a540fff } // n = 6, score = 100 // 3bca | cmp ecx, edx // 7614 | jbe 0x16 // 2bf9 | sub edi, ecx // 8bc2 | mov eax, edx // 0f1f440000 | nop dword ptr [eax + eax] // 8a540fff | mov dl, byte ptr [edi + ecx - 1] $sequence_1 = { 51 8d442420 50 ff742420 } // n = 4, score = 100 // 51 | push ecx // 8d442420 | lea eax, [esp + 0x20] // 50 | push eax // ff742420 | push dword ptr [esp + 0x20] $sequence_2 = { c78424382b000000000000 c78424181a000000000000 7420 ba???????? 8d4c2440 e8???????? } // n = 6, score = 100 // c78424382b000000000000 | mov dword ptr [esp + 0x2b38], 0 // c78424181a000000000000 | mov dword ptr [esp + 0x1a18], 0 // 7420 | je 0x22 // ba???????? | // 8d4c2440 | lea ecx, [esp + 0x40] // e8???????? | $sequence_3 = { 83c40c e9???????? 8b048de8670310 807c022800 7d39 8b7508 } // n = 6, score = 100 // 83c40c | add esp, 0xc // e9???????? | // 8b048de8670310 | mov eax, dword ptr [ecx*4 + 0x100367e8] // 807c022800 | cmp byte ptr [edx + eax + 0x28], 0 // 7d39 | jge 0x3b // 8b7508 | mov esi, dword ptr [ebp + 8] $sequence_4 = { ff7734 8d4f10 ff7730 e8???????? 83c408 3b4730 7505 } // n = 7, score = 100 // ff7734 | push dword ptr [edi + 0x34] // 8d4f10 | lea ecx, [edi + 0x10] // ff7730 | push dword ptr [edi + 0x30] // e8???????? | // 83c408 | add esp, 8 // 3b4730 | cmp eax, dword ptr [edi + 0x30] // 7505 | jne 7 $sequence_5 = { 33c9 33d2 85c9 752e 0fb68298230310 8db5cefdffff 0fb68c15ccfdffff } // n = 7, score = 100 // 33c9 | xor ecx, ecx // 33d2 | xor edx, edx // 85c9 | test ecx, ecx // 752e | jne 0x30 // 0fb68298230310 | movzx eax, byte ptr [edx + 0x10032398] // 8db5cefdffff | lea esi, [ebp - 0x232] // 0fb68c15ccfdffff | movzx ecx, byte ptr [ebp + edx - 0x234] $sequence_6 = { 3914c598c00210 7408 40 83f81d } // n = 4, score = 100 // 3914c598c00210 | cmp dword ptr [eax*8 + 0x1002c098], edx // 7408 | je 0xa // 40 | inc eax // 83f81d | cmp eax, 0x1d $sequence_7 = { 8b048da4b20210 89857cf8ffff 85c0 755d 33c0 } // n = 5, score = 100 // 8b048da4b20210 | mov eax, dword ptr [ecx*4 + 0x1002b2a4] // 89857cf8ffff | mov dword ptr [ebp - 0x784], eax // 85c0 | test eax, eax // 755d | jne 0x5f // 33c0 | xor eax, eax $sequence_8 = { 6bda38 031c8de8670310 eb0c 8bc8 8bd0 } // n = 5, score = 100 // 6bda38 | imul ebx, edx, 0x38 // 031c8de8670310 | add ebx, dword ptr [ecx*4 + 0x100367e8] // eb0c | jmp 0xe // 8bc8 | mov ecx, eax // 8bd0 | mov edx, eax $sequence_9 = { ba???????? 8d4c2440 e8???????? 50 } // n = 4, score = 100 // ba???????? | // 8d4c2440 | lea ecx, [esp + 0x40] // e8???????? | // 50 | push eax condition: 7 of them and filesize < 467968 }
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