There is no description at this point.
rule win_crypmic_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.crypmic." 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.crypmic" 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 = { c1c003 8d4abf 6683f919 0fb7ca 7703 } // n = 5, score = 300 // c1c003 | rol eax, 3 // 8d4abf | lea ecx, [edx - 0x41] // 6683f919 | cmp cx, 0x19 // 0fb7ca | movzx ecx, dx // 7703 | ja 5 $sequence_1 = { 8bf0 8d9b00000000 0fb707 6685c0 } // n = 4, score = 300 // 8bf0 | mov esi, eax // 8d9b00000000 | lea ebx, [ebx] // 0fb707 | movzx eax, word ptr [edi] // 6685c0 | test ax, ax $sequence_2 = { 8b55fc 5f 8b4224 5e 8d0458 5b } // n = 6, score = 300 // 8b55fc | mov edx, dword ptr [ebp - 4] // 5f | pop edi // 8b4224 | mov eax, dword ptr [edx + 0x24] // 5e | pop esi // 8d0458 | lea eax, [eax + ebx*2] // 5b | pop ebx $sequence_3 = { 6a00 8d4df8 51 ff7508 c745f800000000 50 } // n = 6, score = 300 // 6a00 | push 0 // 8d4df8 | lea ecx, [ebp - 8] // 51 | push ecx // ff7508 | push dword ptr [ebp + 8] // c745f800000000 | mov dword ptr [ebp - 8], 0 // 50 | push eax $sequence_4 = { 57 6a00 ff7604 ffd0 8b460c } // n = 5, score = 300 // 57 | push edi // 6a00 | push 0 // ff7604 | push dword ptr [esi + 4] // ffd0 | call eax // 8b460c | mov eax, dword ptr [esi + 0xc] $sequence_5 = { 8b45f2 0faf45f0 0fb7c0 83f801 7504 8bd8 eb33 } // n = 7, score = 300 // 8b45f2 | mov eax, dword ptr [ebp - 0xe] // 0faf45f0 | imul eax, dword ptr [ebp - 0x10] // 0fb7c0 | movzx eax, ax // 83f801 | cmp eax, 1 // 7504 | jne 6 // 8bd8 | mov ebx, eax // eb33 | jmp 0x35 $sequence_6 = { 8b4de4 894f04 8b4de8 894f08 668b4df0 66894f0c 668b45f2 } // n = 7, score = 300 // 8b4de4 | mov ecx, dword ptr [ebp - 0x1c] // 894f04 | mov dword ptr [edi + 4], ecx // 8b4de8 | mov ecx, dword ptr [ebp - 0x18] // 894f08 | mov dword ptr [edi + 8], ecx // 668b4df0 | mov cx, word ptr [ebp - 0x10] // 66894f0c | mov word ptr [edi + 0xc], cx // 668b45f2 | mov ax, word ptr [ebp - 0xe] $sequence_7 = { 5d c3 33c9 33c0 663bcf 741f 0fb7cf } // n = 7, score = 300 // 5d | pop ebp // c3 | ret // 33c9 | xor ecx, ecx // 33c0 | xor eax, eax // 663bcf | cmp cx, di // 741f | je 0x21 // 0fb7cf | movzx ecx, di $sequence_8 = { 33c0 8bcf 66894302 e8???????? } // n = 4, score = 300 // 33c0 | xor eax, eax // 8bcf | mov ecx, edi // 66894302 | mov word ptr [ebx + 2], ax // e8???????? | $sequence_9 = { 05e0ff0000 663bd0 7419 837df800 7444 8b55fc } // n = 6, score = 300 // 05e0ff0000 | add eax, 0xffe0 // 663bd0 | cmp dx, ax // 7419 | je 0x1b // 837df800 | cmp dword ptr [ebp - 8], 0 // 7444 | je 0x46 // 8b55fc | mov edx, dword ptr [ebp - 4] condition: 7 of them and filesize < 81920 }
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