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 = "2020-12-22" version = "1" description = "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 = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { 33c0 e9???????? bf???????? 8d95a8faffff 83c9ff 33c0 } // n = 6, score = 100 // 33c0 | xor eax, eax // e9???????? | // bf???????? | // 8d95a8faffff | lea edx, [ebp - 0x558] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_1 = { 0f8501000000 f8 68???????? 8d8dfcfbffff 51 e8???????? 83c408 } // n = 7, score = 100 // 0f8501000000 | jne 7 // f8 | clc // 68???????? | // 8d8dfcfbffff | lea ecx, [ebp - 0x404] // 51 | push ecx // e8???????? | // 83c408 | add esp, 8 $sequence_2 = { 8dbdf9feffff f3ab 66ab aa 0f8407000000 } // n = 5, score = 100 // 8dbdf9feffff | lea edi, [ebp - 0x107] // 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_3 = { e9???????? bf???????? 8d95a8faffff 83c9ff 33c0 } // n = 5, score = 100 // e9???????? | // bf???????? | // 8d95a8faffff | lea edx, [ebp - 0x558] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax $sequence_4 = { 894df8 8b55f8 3b55f4 7d31 } // n = 4, score = 100 // 894df8 | mov dword ptr [ebp - 8], ecx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 3b55f4 | cmp edx, dword ptr [ebp - 0xc] // 7d31 | jge 0x33 $sequence_5 = { 7523 838548faffff02 83854cfaffff02 80bd46faffff00 } // n = 4, score = 100 // 7523 | jne 0x25 // 838548faffff02 | add dword ptr [ebp - 0x5b8], 2 // 83854cfaffff02 | add dword ptr [ebp - 0x5b4], 2 // 80bd46faffff00 | cmp byte ptr [ebp - 0x5ba], 0 $sequence_6 = { f2ae f7d1 83c1ff 51 8d95f8feffff 52 } // n = 6, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 83c1ff | add ecx, -1 // 51 | push ecx // 8d95f8feffff | lea edx, [ebp - 0x108] // 52 | push edx $sequence_7 = { 8b85f8fbffff 50 e8???????? 83c408 8985f4fbffff 0f8407000000 } // n = 6, score = 100 // 8b85f8fbffff | mov eax, dword ptr [ebp - 0x408] // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 8985f4fbffff | mov dword ptr [ebp - 0x40c], eax // 0f8407000000 | je 0xd $sequence_8 = { 50 68???????? ff15???????? 8985c4fdffff 83bdc4fdffff00 7507 } // n = 6, score = 100 // 50 | push eax // 68???????? | // ff15???????? | // 8985c4fdffff | mov dword ptr [ebp - 0x23c], eax // 83bdc4fdffff00 | cmp dword ptr [ebp - 0x23c], 0 // 7507 | jne 9 $sequence_9 = { ffd3 85c0 7442 68???????? 50 } // n = 5, score = 100 // ffd3 | call ebx // 85c0 | test eax, eax // 7442 | je 0x44 // 68???????? | // 50 | push eax 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