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rule win_webc2_ausov_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 0fbe4801 334dfc 8b5508 0355f8 } // n = 4, score = 100 // 0fbe4801 | movsx ecx, byte ptr [eax + 1] // 334dfc | xor ecx, dword ptr [ebp - 4] // 8b5508 | mov edx, dword ptr [ebp + 8] // 0355f8 | add edx, dword ptr [ebp - 8] $sequence_1 = { 52 e8???????? 83c408 50 8b85f8fbffff 50 e8???????? } // n = 7, score = 100 // 52 | push edx // e8???????? | // 83c408 | add esp, 8 // 50 | push eax // 8b85f8fbffff | mov eax, dword ptr [ebp - 0x408] // 50 | push eax // e8???????? | $sequence_2 = { 83bdc4fdffff00 7507 33c0 e9???????? bf???????? 8d95a8faffff 83c9ff } // n = 7, score = 100 // 83bdc4fdffff00 | cmp dword ptr [ebp - 0x23c], 0 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // bf???????? | // 8d95a8faffff | lea edx, [ebp - 0x558] // 83c9ff | or ecx, 0xffffffff $sequence_3 = { f7d1 83c1ff 8b95f8fbffff 03d1 52 e8???????? } // n = 6, score = 100 // f7d1 | not ecx // 83c1ff | add ecx, -1 // 8b95f8fbffff | mov edx, dword ptr [ebp - 0x408] // 03d1 | add edx, ecx // 52 | push edx // e8???????? | $sequence_4 = { ff15???????? bf???????? 8d95a8faffff 83c9ff 33c0 } // n = 5, score = 100 // ff15???????? | // bf???????? | // 8d95a8faffff | lea edx, [ebp - 0x558] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_5 = { 83bdc4fdffff00 7507 33c0 e9???????? bf???????? 8d95a8faffff } // n = 6, score = 100 // 83bdc4fdffff00 | cmp dword ptr [ebp - 0x23c], 0 // 7507 | jne 9 // 33c0 | xor eax, eax // e9???????? | // bf???????? | // 8d95a8faffff | lea edx, [ebp - 0x558] $sequence_6 = { 52 8d45fc 50 6a00 683f000f00 6a00 6a00 } // n = 7, score = 100 // 52 | push edx // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 6a00 | push 0 // 683f000f00 | push 0xf003f // 6a00 | push 0 // 6a00 | push 0 $sequence_7 = { f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 0f8407000000 } // n = 7, score = 100 // f8 | clc // 68???????? | // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 // 0f8407000000 | je 0xd $sequence_8 = { 6a00 6a00 6a00 68???????? 8d85f8fbffff 50 } // n = 6, score = 100 // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 8d85f8fbffff | lea eax, [ebp - 0x408] // 50 | push eax $sequence_9 = { 33c0 f2ae f7d1 83c1ff 8b95f8fbffff 03d1 } // n = 6, score = 100 // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 83c1ff | add ecx, -1 // 8b95f8fbffff | mov edx, dword ptr [ebp - 0x408] // 03d1 | add edx, ecx condition: 7 of them and filesize < 40960 }
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