There is no description at this point.
rule win_crypt0l0cker_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 0f8486000000 53 8d58ff c1eb02 56 } // n = 6, score = 100 // 85c0 | test eax, eax // 0f8486000000 | je 0x8c // 53 | push ebx // 8d58ff | lea ebx, [eax - 1] // c1eb02 | shr ebx, 2 // 56 | push esi $sequence_1 = { 8b4640 85c0 0f8479000000 83780c00 7473 6800010000 e8???????? } // n = 7, score = 100 // 8b4640 | mov eax, dword ptr [esi + 0x40] // 85c0 | test eax, eax // 0f8479000000 | je 0x7f // 83780c00 | cmp dword ptr [eax + 0xc], 0 // 7473 | je 0x75 // 6800010000 | push 0x100 // e8???????? | $sequence_2 = { 85f6 0f8ead000000 8d4108 8d04b8 894508 8b4510 83c008 } // n = 7, score = 100 // 85f6 | test esi, esi // 0f8ead000000 | jle 0xb3 // 8d4108 | lea eax, [ecx + 8] // 8d04b8 | lea eax, [eax + edi*4] // 894508 | mov dword ptr [ebp + 8], eax // 8b4510 | mov eax, dword ptr [ebp + 0x10] // 83c008 | add eax, 8 $sequence_3 = { 55 56 8d44240f 8bea 50 6a01 ff35???????? } // n = 7, score = 100 // 55 | push ebp // 56 | push esi // 8d44240f | lea eax, [esp + 0xf] // 8bea | mov ebp, edx // 50 | push eax // 6a01 | push 1 // ff35???????? | $sequence_4 = { 83c40c 33c0 6689043b 897e08 85ff 0f84d6000000 } // n = 6, score = 100 // 83c40c | add esp, 0xc // 33c0 | xor eax, eax // 6689043b | mov word ptr [ebx + edi], ax // 897e08 | mov dword ptr [esi + 8], edi // 85ff | test edi, edi // 0f84d6000000 | je 0xdc $sequence_5 = { 8b4c243c 8b442430 8911 894104 eb17 8bcf e8???????? } // n = 7, score = 100 // 8b4c243c | mov ecx, dword ptr [esp + 0x3c] // 8b442430 | mov eax, dword ptr [esp + 0x30] // 8911 | mov dword ptr [ecx], edx // 894104 | mov dword ptr [ecx + 4], eax // eb17 | jmp 0x19 // 8bcf | mov ecx, edi // e8???????? | $sequence_6 = { b9???????? 3d90010000 0f4cce 8bf1 8b7f04 85f6 74c9 } // n = 7, score = 100 // b9???????? | // 3d90010000 | cmp eax, 0x190 // 0f4cce | cmovl ecx, esi // 8bf1 | mov esi, ecx // 8b7f04 | mov edi, dword ptr [edi + 4] // 85f6 | test esi, esi // 74c9 | je 0xffffffcb $sequence_7 = { 8bce e8???????? 8bf8 83c408 85ff 7438 83c705 } // n = 7, score = 100 // 8bce | mov ecx, esi // e8???????? | // 8bf8 | mov edi, eax // 83c408 | add esp, 8 // 85ff | test edi, edi // 7438 | je 0x3a // 83c705 | add edi, 5 $sequence_8 = { 68???????? 6a05 6840b6b9a6 6a1c e8???????? 83c424 } // n = 6, score = 100 // 68???????? | // 6a05 | push 5 // 6840b6b9a6 | push 0xa6b9b640 // 6a1c | push 0x1c // e8???????? | // 83c424 | add esp, 0x24 $sequence_9 = { 0f8581020000 807dee81 0f8577020000 ff75ef ff15???????? 8b0f 8bd3 } // n = 7, score = 100 // 0f8581020000 | jne 0x287 // 807dee81 | cmp byte ptr [ebp - 0x12], 0x81 // 0f8577020000 | jne 0x27d // ff75ef | push dword ptr [ebp - 0x11] // ff15???????? | // 8b0f | mov ecx, dword ptr [edi] // 8bd3 | mov edx, ebx condition: 7 of them and filesize < 917504 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY