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rule win_cryptowall_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.cryptowall" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 50 8b4dec 51 e8???????? 8b5030 } // n = 5, score = 2100 // 50 | push eax // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 51 | push ecx // e8???????? | // 8b5030 | mov edx, dword ptr [eax + 0x30] $sequence_1 = { 8b45fc 50 8b4dec 51 e8???????? 8b5030 } // n = 6, score = 2100 // 8b45fc | mov eax, dword ptr [ebp - 4] // 50 | push eax // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 51 | push ecx // e8???????? | // 8b5030 | mov edx, dword ptr [eax + 0x30] $sequence_2 = { 8b45fc 2d00080000 8945fc ebe5 8b45fc 8be5 } // n = 6, score = 2100 // 8b45fc | mov eax, dword ptr [ebp - 4] // 2d00080000 | sub eax, 0x800 // 8945fc | mov dword ptr [ebp - 4], eax // ebe5 | jmp 0xffffffe7 // 8b45fc | mov eax, dword ptr [ebp - 4] // 8be5 | mov esp, ebp $sequence_3 = { 837d0800 750a b80d0000c0 e9???????? } // n = 4, score = 2100 // 837d0800 | cmp dword ptr [ebp + 8], 0 // 750a | jne 0xc // b80d0000c0 | mov eax, 0xc000000d // e9???????? | $sequence_4 = { 52 e8???????? 83c408 8b0d???????? 8981b4000000 } // n = 5, score = 2100 // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 8b0d???????? | // 8981b4000000 | mov dword ptr [ecx + 0xb4], eax $sequence_5 = { eb17 8b4508 ba10270000 f7e2 } // n = 4, score = 2100 // eb17 | jmp 0x19 // 8b4508 | mov eax, dword ptr [ebp + 8] // ba10270000 | mov edx, 0x2710 // f7e2 | mul edx $sequence_6 = { 668945ec b933000000 66894dee ba32000000 668955f0 33c0 668945f2 } // n = 7, score = 2100 // 668945ec | mov word ptr [ebp - 0x14], ax // b933000000 | mov ecx, 0x33 // 66894dee | mov word ptr [ebp - 0x12], cx // ba32000000 | mov edx, 0x32 // 668955f0 | mov word ptr [ebp - 0x10], dx // 33c0 | xor eax, eax // 668945f2 | mov word ptr [ebp - 0xe], ax $sequence_7 = { 83c408 3b4508 751c 837d0cff 740b } // n = 5, score = 2100 // 83c408 | add esp, 8 // 3b4508 | cmp eax, dword ptr [ebp + 8] // 751c | jne 0x1e // 837d0cff | cmp dword ptr [ebp + 0xc], -1 // 740b | je 0xd $sequence_8 = { 6a08 6a00 8d55ec 52 } // n = 4, score = 2100 // 6a08 | push 8 // 6a00 | push 0 // 8d55ec | lea edx, [ebp - 0x14] // 52 | push edx $sequence_9 = { e8???????? 83c408 8b0d???????? 8981f4000000 } // n = 4, score = 2100 // e8???????? | // 83c408 | add esp, 8 // 8b0d???????? | // 8981f4000000 | mov dword ptr [ecx + 0xf4], eax condition: 7 of them and filesize < 417792 }
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