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rule win_redyms_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.redyms." 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.redyms" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 85c0 7414 8b4f04 57 } // n = 4, score = 100 // 85c0 | test eax, eax // 7414 | je 0x16 // 8b4f04 | mov ecx, dword ptr [edi + 4] // 57 | push edi $sequence_1 = { ffd6 57 ff15???????? 0fb6450b f7d8 5f 1bc0 } // n = 7, score = 100 // ffd6 | call esi // 57 | push edi // ff15???????? | // 0fb6450b | movzx eax, byte ptr [ebp + 0xb] // f7d8 | neg eax // 5f | pop edi // 1bc0 | sbb eax, eax $sequence_2 = { 2bc2 68???????? 6a03 b9???????? 8bd7 e8???????? 83c408 } // n = 7, score = 100 // 2bc2 | sub eax, edx // 68???????? | // 6a03 | push 3 // b9???????? | // 8bd7 | mov edx, edi // e8???????? | // 83c408 | add esp, 8 $sequence_3 = { 84c0 7467 807dfb00 7561 8b5514 } // n = 5, score = 100 // 84c0 | test al, al // 7467 | je 0x69 // 807dfb00 | cmp byte ptr [ebp - 5], 0 // 7561 | jne 0x63 // 8b5514 | mov edx, dword ptr [ebp + 0x14] $sequence_4 = { 8bf0 83c404 85f6 740e e8???????? 84c0 7405 } // n = 7, score = 100 // 8bf0 | mov esi, eax // 83c404 | add esp, 4 // 85f6 | test esi, esi // 740e | je 0x10 // e8???????? | // 84c0 | test al, al // 7405 | je 7 $sequence_5 = { 55 8bec 83ec1c 8845f4 8b4508 8d5001 90 } // n = 7, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 83ec1c | sub esp, 0x1c // 8845f4 | mov byte ptr [ebp - 0xc], al // 8b4508 | mov eax, dword ptr [ebp + 8] // 8d5001 | lea edx, [eax + 1] // 90 | nop $sequence_6 = { 898534feffff 85c0 745d 8dbd70ffffff b806000000 e8???????? 53 } // n = 7, score = 100 // 898534feffff | mov dword ptr [ebp - 0x1cc], eax // 85c0 | test eax, eax // 745d | je 0x5f // 8dbd70ffffff | lea edi, [ebp - 0x90] // b806000000 | mov eax, 6 // e8???????? | // 53 | push ebx $sequence_7 = { 8975f4 895df8 ff15???????? 8bf8 } // n = 4, score = 100 // 8975f4 | mov dword ptr [ebp - 0xc], esi // 895df8 | mov dword ptr [ebp - 8], ebx // ff15???????? | // 8bf8 | mov edi, eax $sequence_8 = { 7409 53 57 56 ff15???????? 8975d4 eb22 } // n = 7, score = 100 // 7409 | je 0xb // 53 | push ebx // 57 | push edi // 56 | push esi // ff15???????? | // 8975d4 | mov dword ptr [ebp - 0x2c], esi // eb22 | jmp 0x24 $sequence_9 = { 0f84b2000000 8d7ddc b825000000 e8???????? 8b4dd0 8b55d4 a1???????? } // n = 7, score = 100 // 0f84b2000000 | je 0xb8 // 8d7ddc | lea edi, [ebp - 0x24] // b825000000 | mov eax, 0x25 // e8???????? | // 8b4dd0 | mov ecx, dword ptr [ebp - 0x30] // 8b55d4 | mov edx, dword ptr [ebp - 0x2c] // a1???????? | condition: 7 of them and filesize < 98304 }
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