There is no description at this point.
rule win_cryptowall_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.cryptowall." 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.cryptowall" 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 = { e8???????? 83c408 e9???????? 837d0c02 752e } // n = 5, score = 2100 // e8???????? | // 83c408 | add esp, 8 // e9???????? | // 837d0c02 | cmp dword ptr [ebp + 0xc], 2 // 752e | jne 0x30 $sequence_1 = { 52 6a00 e8???????? 8b4018 50 } // n = 5, score = 2100 // 52 | push edx // 6a00 | push 0 // e8???????? | // 8b4018 | mov eax, dword ptr [eax + 0x18] // 50 | push eax $sequence_2 = { b873000000 668945e4 b979000000 66894de6 ba73000000 668955e8 } // n = 6, score = 2100 // b873000000 | mov eax, 0x73 // 668945e4 | mov word ptr [ebp - 0x1c], ax // b979000000 | mov ecx, 0x79 // 66894de6 | mov word ptr [ebp - 0x1a], cx // ba73000000 | mov edx, 0x73 // 668955e8 | mov word ptr [ebp - 0x18], dx $sequence_3 = { 7d1f 6a09 6a00 e8???????? } // n = 4, score = 2100 // 7d1f | jge 0x21 // 6a09 | push 9 // 6a00 | push 0 // e8???????? | $sequence_4 = { e8???????? 83c408 8b0d???????? 894124 } // n = 4, score = 2100 // e8???????? | // 83c408 | add esp, 8 // 8b0d???????? | // 894124 | mov dword ptr [ecx + 0x24], eax $sequence_5 = { 83fa5a 7f0b 0fb74508 83c020 66894508 } // n = 5, score = 2100 // 83fa5a | cmp edx, 0x5a // 7f0b | jg 0xd // 0fb74508 | movzx eax, word ptr [ebp + 8] // 83c020 | add eax, 0x20 // 66894508 | mov word ptr [ebp + 8], ax $sequence_6 = { 7511 6aff 8b4508 50 } // n = 4, score = 2100 // 7511 | jne 0x13 // 6aff | push -1 // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax $sequence_7 = { 8945fc 8b4dfc 0fb711 81fa4d5a0000 740d } // n = 5, score = 2100 // 8945fc | mov dword ptr [ebp - 4], eax // 8b4dfc | mov ecx, dword ptr [ebp - 4] // 0fb711 | movzx edx, word ptr [ecx] // 81fa4d5a0000 | cmp edx, 0x5a4d // 740d | je 0xf $sequence_8 = { 0fbe4d08 83f97a 7f0a 0fbe5508 83ea20 885508 } // n = 6, score = 2100 // 0fbe4d08 | movsx ecx, byte ptr [ebp + 8] // 83f97a | cmp ecx, 0x7a // 7f0a | jg 0xc // 0fbe5508 | movsx edx, byte ptr [ebp + 8] // 83ea20 | sub edx, 0x20 // 885508 | mov byte ptr [ebp + 8], dl $sequence_9 = { c645ea64 c645eb7c c645ec25 c645ed73 c645ee7c c645ef25 } // n = 6, score = 2100 // c645ea64 | mov byte ptr [ebp - 0x16], 0x64 // c645eb7c | mov byte ptr [ebp - 0x15], 0x7c // c645ec25 | mov byte ptr [ebp - 0x14], 0x25 // c645ed73 | mov byte ptr [ebp - 0x13], 0x73 // c645ee7c | mov byte ptr [ebp - 0x12], 0x7c // c645ef25 | mov byte ptr [ebp - 0x11], 0x25 condition: 7 of them and filesize < 417792 }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below.
Please propose all changes regarding references on the Malpedia library page
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY