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rule win_vhd_ransomware_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.vhd_ransomware." 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.vhd_ransomware" 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 = { 7247 7708 39b5c8fcffff 723d 8b95c8fcffff 50 56 } // n = 7, score = 100 // 7247 | jb 0x49 // 7708 | ja 0xa // 39b5c8fcffff | cmp dword ptr [ebp - 0x338], esi // 723d | jb 0x3f // 8b95c8fcffff | mov edx, dword ptr [ebp - 0x338] // 50 | push eax // 56 | push esi $sequence_1 = { 7445 8b9574f6ffff 33c0 8d7a04 } // n = 4, score = 100 // 7445 | je 0x47 // 8b9574f6ffff | mov edx, dword ptr [ebp - 0x98c] // 33c0 | xor eax, eax // 8d7a04 | lea edi, [edx + 4] $sequence_2 = { e8???????? 8be5 5d c3 33c0 b9c8000000 8d7b04 } // n = 7, score = 100 // e8???????? | // 8be5 | mov esp, ebp // 5d | pop ebp // c3 | ret // 33c0 | xor eax, eax // b9c8000000 | mov ecx, 0xc8 // 8d7b04 | lea edi, [ebx + 4] $sequence_3 = { 56 8bd9 57 8d7a04 b9c8000000 8d750c } // n = 6, score = 100 // 56 | push esi // 8bd9 | mov ebx, ecx // 57 | push edi // 8d7a04 | lea edi, [edx + 4] // b9c8000000 | mov ecx, 0xc8 // 8d750c | lea esi, [ebp + 0xc] $sequence_4 = { 8d8da4f9ffff 51 e8???????? b9c9000000 8dbd7cf6ffff 8bf0 } // n = 6, score = 100 // 8d8da4f9ffff | lea ecx, [ebp - 0x65c] // 51 | push ecx // e8???????? | // b9c9000000 | mov ecx, 0xc9 // 8dbd7cf6ffff | lea edi, [ebp - 0x984] // 8bf0 | mov esi, eax $sequence_5 = { 33c0 b9c8000000 8bfa f3ab 8b450c 899598f9ffff c70601000000 } // n = 7, score = 100 // 33c0 | xor eax, eax // b9c8000000 | mov ecx, 0xc8 // 8bfa | mov edi, edx // f3ab | rep stosd dword ptr es:[edi], eax // 8b450c | mov eax, dword ptr [ebp + 0xc] // 899598f9ffff | mov dword ptr [ebp - 0x668], edx // c70601000000 | mov dword ptr [esi], 1 $sequence_6 = { f7d8 99 53 52 50 57 ff15???????? } // n = 7, score = 100 // f7d8 | neg eax // 99 | cdq // 53 | push ebx // 52 | push edx // 50 | push eax // 57 | push edi // ff15???????? | $sequence_7 = { 8d4dec c745fc???????? e8???????? 68???????? 8d45ec 50 c745ece4514100 } // n = 7, score = 100 // 8d4dec | lea ecx, [ebp - 0x14] // c745fc???????? | // e8???????? | // 68???????? | // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // c745ece4514100 | mov dword ptr [ebp - 0x14], 0x4151e4 $sequence_8 = { 8d4a04 8bb48538030000 8931 40 } // n = 4, score = 100 // 8d4a04 | lea ecx, [edx + 4] // 8bb48538030000 | mov esi, dword ptr [ebp + eax*4 + 0x338] // 8931 | mov dword ptr [ecx], esi // 40 | inc eax $sequence_9 = { 897df4 894d08 3b0e 7ccd 8bc8 0bcf } // n = 6, score = 100 // 897df4 | mov dword ptr [ebp - 0xc], edi // 894d08 | mov dword ptr [ebp + 8], ecx // 3b0e | cmp ecx, dword ptr [esi] // 7ccd | jl 0xffffffcf // 8bc8 | mov ecx, eax // 0bcf | or ecx, edi condition: 7 of them and filesize < 275456 }
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