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rule win_crypt0l0cker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.crypt0l0cker." 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.crypt0l0cker" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 742b 57 50 6a00 ff35???????? ff15???????? } // n = 7, score = 100 // 85c0 | test eax, eax // 742b | je 0x2d // 57 | push edi // 50 | push eax // 6a00 | push 0 // ff35???????? | // ff15???????? | $sequence_1 = { 897dfc 8b15???????? 8b149514d1a800 8d8d44ffffff e8???????? 8d8d44ffffff } // n = 6, score = 100 // 897dfc | mov dword ptr [ebp - 4], edi // 8b15???????? | // 8b149514d1a800 | mov edx, dword ptr [edx*4 + 0xa8d114] // 8d8d44ffffff | lea ecx, [ebp - 0xbc] // e8???????? | // 8d8d44ffffff | lea ecx, [ebp - 0xbc] $sequence_2 = { 6a05 68152eeba0 6a19 e8???????? 8bc8 83c420 85c9 } // n = 7, score = 100 // 6a05 | push 5 // 68152eeba0 | push 0xa0eb2e15 // 6a19 | push 0x19 // e8???????? | // 8bc8 | mov ecx, eax // 83c420 | add esp, 0x20 // 85c9 | test ecx, ecx $sequence_3 = { 5e c3 85ff b8???????? 0f45c7 50 e8???????? } // n = 7, score = 100 // 5e | pop esi // c3 | ret // 85ff | test edi, edi // b8???????? | // 0f45c7 | cmovne eax, edi // 50 | push eax // e8???????? | $sequence_4 = { 5b 85ff 7e18 8b0e 83c1fc 03ca 8b01 } // n = 7, score = 100 // 5b | pop ebx // 85ff | test edi, edi // 7e18 | jle 0x1a // 8b0e | mov ecx, dword ptr [esi] // 83c1fc | add ecx, -4 // 03ca | add ecx, edx // 8b01 | mov eax, dword ptr [ecx] $sequence_5 = { 85f6 747c 83ec0c 8bd3 8bce ff75f0 e8???????? } // n = 7, score = 100 // 85f6 | test esi, esi // 747c | je 0x7e // 83ec0c | sub esp, 0xc // 8bd3 | mov edx, ebx // 8bce | mov ecx, esi // ff75f0 | push dword ptr [ebp - 0x10] // e8???????? | $sequence_6 = { 33db 3b75f8 6a01 58 0f42d8 8b4508 895df8 } // n = 7, score = 100 // 33db | xor ebx, ebx // 3b75f8 | cmp esi, dword ptr [ebp - 8] // 6a01 | push 1 // 58 | pop eax // 0f42d8 | cmovb ebx, eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 895df8 | mov dword ptr [ebp - 8], ebx $sequence_7 = { 335d04 0fb6460a c1e208 0bd0 0fb6460b c1e208 0bd0 } // n = 7, score = 100 // 335d04 | xor ebx, dword ptr [ebp + 4] // 0fb6460a | movzx eax, byte ptr [esi + 0xa] // c1e208 | shl edx, 8 // 0bd0 | or edx, eax // 0fb6460b | movzx eax, byte ptr [esi + 0xb] // c1e208 | shl edx, 8 // 0bd0 | or edx, eax $sequence_8 = { 5d c3 6a2c e8???????? 59 85c0 7501 } // n = 7, score = 100 // 5d | pop ebp // c3 | ret // 6a2c | push 0x2c // e8???????? | // 59 | pop ecx // 85c0 | test eax, eax // 7501 | jne 3 $sequence_9 = { 8bf8 85ff 7478 8bd6 8bcf e8???????? 8bcf } // n = 7, score = 100 // 8bf8 | mov edi, eax // 85ff | test edi, edi // 7478 | je 0x7a // 8bd6 | mov edx, esi // 8bcf | mov ecx, edi // e8???????? | // 8bcf | mov ecx, edi condition: 7 of them and filesize < 917504 }
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