There is no description at this point.
rule win_cryptoshield_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.cryptoshield." 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.cryptoshield" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 6a00 56 ff15???????? 6a00 8d85e8fbffff 50 6a01 } // n = 7, score = 300 // 6a00 | push 0 // 56 | push esi // ff15???????? | // 6a00 | push 0 // 8d85e8fbffff | lea eax, [ebp - 0x418] // 50 | push eax // 6a01 | push 1 $sequence_1 = { 57 6a01 57 ff75fc ff15???????? 85c0 7461 } // n = 7, score = 300 // 57 | push edi // 6a01 | push 1 // 57 | push edi // ff75fc | push dword ptr [ebp - 4] // ff15???????? | // 85c0 | test eax, eax // 7461 | je 0x63 $sequence_2 = { ff15???????? 85c0 7508 ffd3 8bf8 } // n = 5, score = 300 // ff15???????? | // 85c0 | test eax, eax // 7508 | jne 0xa // ffd3 | call ebx // 8bf8 | mov edi, eax $sequence_3 = { 5f 5e 8913 5b 5d c3 } // n = 6, score = 300 // 5f | pop edi // 5e | pop esi // 8913 | mov dword ptr [ebx], edx // 5b | pop ebx // 5d | pop ebp // c3 | ret $sequence_4 = { 0f8522010000 68???????? 68???????? ffd6 85c0 0f850e010000 } // n = 6, score = 300 // 0f8522010000 | jne 0x128 // 68???????? | // 68???????? | // ffd6 | call esi // 85c0 | test eax, eax // 0f850e010000 | jne 0x114 $sequence_5 = { 66833800 740c 0fb77202 83c202 6685f6 } // n = 5, score = 300 // 66833800 | cmp word ptr [eax], 0 // 740c | je 0xe // 0fb77202 | movzx esi, word ptr [edx + 2] // 83c202 | add edx, 2 // 6685f6 | test si, si $sequence_6 = { 8d85e8faffff 68???????? 50 ff15???????? 83c40c } // n = 5, score = 300 // 8d85e8faffff | lea eax, [ebp - 0x518] // 68???????? | // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc $sequence_7 = { 5d c3 8a55fa 80fa02 } // n = 4, score = 300 // 5d | pop ebp // c3 | ret // 8a55fa | mov dl, byte ptr [ebp - 6] // 80fa02 | cmp dl, 2 $sequence_8 = { 50 8d85f4fdffff 50 c785f0fdffff05010000 ff15???????? 85c0 7513 } // n = 7, score = 300 // 50 | push eax // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 50 | push eax // c785f0fdffff05010000 | mov dword ptr [ebp - 0x210], 0x105 // ff15???????? | // 85c0 | test eax, eax // 7513 | jne 0x15 $sequence_9 = { 8d85f0fcffff 50 8d85e8faffff 68???????? 50 ff15???????? } // n = 6, score = 300 // 8d85f0fcffff | lea eax, [ebp - 0x310] // 50 | push eax // 8d85e8faffff | lea eax, [ebp - 0x518] // 68???????? | // 50 | push eax // ff15???????? | condition: 7 of them and filesize < 131072 }
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