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rule win_ranbyus_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.ranbyus." 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.ranbyus" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 33c0 40 eb11 50 } // n = 4, score = 1100 // 33c0 | xor eax, eax // 40 | inc eax // eb11 | jmp 0x13 // 50 | push eax $sequence_1 = { 8bc8 e8???????? 50 e8???????? 8bf0 59 } // n = 6, score = 1100 // 8bc8 | mov ecx, eax // e8???????? | // 50 | push eax // e8???????? | // 8bf0 | mov esi, eax // 59 | pop ecx $sequence_2 = { 89410b 8b4605 39780b 7407 } // n = 4, score = 1100 // 89410b | mov dword ptr [ecx + 0xb], eax // 8b4605 | mov eax, dword ptr [esi + 5] // 39780b | cmp dword ptr [eax + 0xb], edi // 7407 | je 9 $sequence_3 = { 7458 57 ff74240c 83c02c 50 e8???????? 8bf8 } // n = 7, score = 1100 // 7458 | je 0x5a // 57 | push edi // ff74240c | push dword ptr [esp + 0xc] // 83c02c | add eax, 0x2c // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax $sequence_4 = { ff7510 6806800000 ff7508 ff7720 } // n = 4, score = 1100 // ff7510 | push dword ptr [ebp + 0x10] // 6806800000 | push 0x8006 // ff7508 | push dword ptr [ebp + 8] // ff7720 | push dword ptr [edi + 0x20] $sequence_5 = { 8bc8 e8???????? 50 e8???????? 59 33c0 c3 } // n = 7, score = 1100 // 8bc8 | mov ecx, eax // e8???????? | // 50 | push eax // e8???????? | // 59 | pop ecx // 33c0 | xor eax, eax // c3 | ret $sequence_6 = { 834e2540 668b03 66894618 eb09 834e2520 8a03 884617 } // n = 7, score = 1100 // 834e2540 | or dword ptr [esi + 0x25], 0x40 // 668b03 | mov ax, word ptr [ebx] // 66894618 | mov word ptr [esi + 0x18], ax // eb09 | jmp 0xb // 834e2520 | or dword ptr [esi + 0x25], 0x20 // 8a03 | mov al, byte ptr [ebx] // 884617 | mov byte ptr [esi + 0x17], al $sequence_7 = { 837d0c00 7513 68???????? ff7508 e8???????? 59 } // n = 6, score = 1100 // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 7513 | jne 0x15 // 68???????? | // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx $sequence_8 = { 668b03 66894618 eb09 834e2520 8a03 884617 03d9 } // n = 7, score = 1100 // 668b03 | mov ax, word ptr [ebx] // 66894618 | mov word ptr [esi + 0x18], ax // eb09 | jmp 0xb // 834e2520 | or dword ptr [esi + 0x25], 0x20 // 8a03 | mov al, byte ptr [ebx] // 884617 | mov byte ptr [esi + 0x17], al // 03d9 | add ebx, ecx $sequence_9 = { 84c0 0f84b9000000 46 803e45 75e3 } // n = 5, score = 1100 // 84c0 | test al, al // 0f84b9000000 | je 0xbf // 46 | inc esi // 803e45 | cmp byte ptr [esi], 0x45 // 75e3 | jne 0xffffffe5 condition: 7 of them and filesize < 638976 }
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