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rule win_webc2_ausov_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" 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 = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 55 8bec 81ec0c040000 53 56 57 0f8407000000 } // n = 7, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 81ec0c040000 | sub esp, 0x40c // 53 | push ebx // 56 | push esi // 57 | push edi // 0f8407000000 | je 0xd $sequence_1 = { 8d8dbcfcffff 51 ff15???????? bf???????? 8d95a8faffff 83c9ff 33c0 } // n = 7, score = 100 // 8d8dbcfcffff | lea ecx, dword ptr [ebp - 0x344] // 51 | push ecx // ff15???????? | // bf???????? | // 8d95a8faffff | lea edx, dword ptr [ebp - 0x558] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_2 = { e9???????? 0f8407000000 0f8501000000 f8 68???????? } // n = 5, score = 100 // e9???????? | // 0f8407000000 | je 0xd // 0f8501000000 | jne 7 // f8 | clc // 68???????? | $sequence_3 = { ffd7 8b0d???????? a3???????? 85c9 742b } // n = 5, score = 100 // ffd7 | call edi // 8b0d???????? | // a3???????? | // 85c9 | test ecx, ecx // 742b | je 0x2d $sequence_4 = { f3a4 c78550faffff44000000 b910000000 33c0 } // n = 4, score = 100 // f3a4 | rep movsb byte ptr es:[edi], byte ptr [esi] // c78550faffff44000000 | mov dword ptr [ebp - 0x5b0], 0x44 // b910000000 | mov ecx, 0x10 // 33c0 | xor eax, eax $sequence_5 = { 8b0d???????? 85c9 740d 85c0 7409 } // n = 5, score = 100 // 8b0d???????? | // 85c9 | test ecx, ecx // 740d | je 0xf // 85c0 | test eax, eax // 7409 | je 0xb $sequence_6 = { e9???????? 8dbdfcfbffff 83c9ff 33c0 } // n = 4, score = 100 // e9???????? | // 8dbdfcfbffff | lea edi, dword ptr [ebp - 0x404] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_7 = { 83854cfaffff02 80bd46faffff00 75ae c78540faffff00000000 eb0b 1bc0 83d8ff } // n = 7, score = 100 // 83854cfaffff02 | add dword ptr [ebp - 0x5b4], 2 // 80bd46faffff00 | cmp byte ptr [ebp - 0x5ba], 0 // 75ae | jne 0xffffffb0 // c78540faffff00000000 | mov dword ptr [ebp - 0x5c0], 0 // eb0b | jmp 0xd // 1bc0 | sbb eax, eax // 83d8ff | sbb eax, -1 $sequence_8 = { f3ab 66ab aa 0f8407000000 } // n = 4, score = 100 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 0f8407000000 | je 0xd $sequence_9 = { 51 8d95f8feffff 52 6a02 6a00 68???????? 8d85f8fdffff } // n = 7, score = 100 // 51 | push ecx // 8d95f8feffff | lea edx, dword ptr [ebp - 0x108] // 52 | push edx // 6a02 | push 2 // 6a00 | push 0 // 68???????? | // 8d85f8fdffff | lea eax, dword ptr [ebp - 0x208] condition: 7 of them and filesize < 40960 }
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