Actor(s): Comment Crew
There is no description at this point.
rule win_webc2_ausov_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_ausov." 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.webc2_ausov" 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 = { 8bc8 83e103 f3a4 eb04 33c0 } // n = 5, score = 100 // 8bc8 | mov ecx, eax // 83e103 | and ecx, 3 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // eb04 | jmp 6 // 33c0 | xor eax, eax $sequence_1 = { 57 68???????? ffd3 8bf0 85f6 0f8487000000 8b3d???????? } // n = 7, score = 100 // 57 | push edi // 68???????? | // ffd3 | call ebx // 8bf0 | mov esi, eax // 85f6 | test esi, esi // 0f8487000000 | je 0x8d // 8b3d???????? | $sequence_2 = { 83c408 50 8b4d08 51 e8???????? 83c408 8985f8fbffff } // n = 7, score = 100 // 83c408 | add esp, 8 // 50 | push eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 8985f8fbffff | mov dword ptr [ebp - 0x408], eax $sequence_3 = { 52 e8???????? 83c408 50 8b85f8fbffff 50 } // n = 6, score = 100 // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 50 | push eax // 8b85f8fbffff | mov eax, dword ptr [ebp - 0x408] // 50 | push eax $sequence_4 = { 8d85a8faffff 50 68???????? ff15???????? 8985c4fdffff 83bdc4fdffff00 7507 } // n = 7, score = 100 // 8d85a8faffff | lea eax, [ebp - 0x558] // 50 | push eax // 68???????? | // ff15???????? | // 8985c4fdffff | mov dword ptr [ebp - 0x23c], eax // 83bdc4fdffff00 | cmp dword ptr [ebp - 0x23c], 0 // 7507 | jne 9 $sequence_5 = { 53 56 57 0f8407000000 0f8501000000 } // n = 5, score = 100 // 53 | push ebx // 56 | push esi // 57 | push edi // 0f8407000000 | je 0xd // 0f8501000000 | jne 7 $sequence_6 = { 8d85f8fbffff 50 e8???????? 83c408 50 ff15???????? } // n = 6, score = 100 // 8d85f8fbffff | lea eax, [ebp - 0x408] // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 50 | push eax // ff15???????? | $sequence_7 = { 7442 68???????? 50 ffd7 8b0d???????? a3???????? 85c9 } // n = 7, score = 100 // 7442 | je 0x44 // 68???????? | // 50 | push eax // ffd7 | call edi // 8b0d???????? | // a3???????? | // 85c9 | test ecx, ecx $sequence_8 = { 85c9 740d 85c0 7409 5f } // n = 5, score = 100 // 85c9 | test ecx, ecx // 740d | je 0xf // 85c0 | test eax, eax // 7409 | je 0xb // 5f | pop edi $sequence_9 = { 6a00 6a00 68???????? 8d85f8fbffff } // n = 4, score = 100 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 8d85f8fbffff | lea eax, [ebp - 0x408] condition: 7 of them and filesize < 40960 }
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