Actor(s): Comment Crew
There is no description at this point.
rule win_webc2_div_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_div" 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 = { 85c0 0f85b8000000 8dbc241c020000 83c9ff } // n = 4, score = 100 // 85c0 | test eax, eax // 0f85b8000000 | jne 0xbe // 8dbc241c020000 | lea edi, [esp + 0x21c] // 83c9ff | or ecx, 0xffffffff $sequence_1 = { 55 56 57 33ff 33db 397c2418 } // n = 6, score = 100 // 55 | push ebp // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 33db | xor ebx, ebx // 397c2418 | cmp dword ptr [esp + 0x18], edi $sequence_2 = { ff15???????? 8dbc2418010000 83c9ff 33c0 8d94241c020000 f2ae } // n = 6, score = 100 // ff15???????? | // 8dbc2418010000 | lea edi, [esp + 0x118] // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 8d94241c020000 | lea edx, [esp + 0x21c] // f2ae | repne scasb al, byte ptr es:[edi] $sequence_3 = { 85c0 7407 33c0 5e 83c454 c3 } // n = 6, score = 100 // 85c0 | test eax, eax // 7407 | je 9 // 33c0 | xor eax, eax // 5e | pop esi // 83c454 | add esp, 0x54 // c3 | ret $sequence_4 = { 50 8d85ecfdffff 50 ff15???????? 6a09 } // n = 5, score = 100 // 50 | push eax // 8d85ecfdffff | lea eax, [ebp - 0x214] // 50 | push eax // ff15???????? | // 6a09 | push 9 $sequence_5 = { 83c9ff 33c0 8d942424040000 f2ae f7d1 2bf9 } // n = 6, score = 100 // 83c9ff | or ecx, 0xffffffff // 33c0 | xor eax, eax // 8d942424040000 | lea edx, [esp + 0x424] // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx $sequence_6 = { 7519 c7048e29000000 eb10 c7048e28000000 eb07 c7048e27000000 8a0411 } // n = 7, score = 100 // 7519 | jne 0x1b // c7048e29000000 | mov dword ptr [esi + ecx*4], 0x29 // eb10 | jmp 0x12 // c7048e28000000 | mov dword ptr [esi + ecx*4], 0x28 // eb07 | jmp 9 // c7048e27000000 | mov dword ptr [esi + ecx*4], 0x27 // 8a0411 | mov al, byte ptr [ecx + edx] $sequence_7 = { 83f819 7f07 8ac8 80c161 eb1a 83f826 7f0b } // n = 7, score = 100 // 83f819 | cmp eax, 0x19 // 7f07 | jg 9 // 8ac8 | mov cl, al // 80c161 | add cl, 0x61 // eb1a | jmp 0x1c // 83f826 | cmp eax, 0x26 // 7f0b | jg 0xd $sequence_8 = { f2ae f7d1 2bf9 8d95f0feffff 8bf7 } // n = 5, score = 100 // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx // 2bf9 | sub edi, ecx // 8d95f0feffff | lea edx, [ebp - 0x110] // 8bf7 | mov esi, edi $sequence_9 = { 83c9ff c70001000000 8d5008 33c0 f2ae f7d1 } // n = 6, score = 100 // 83c9ff | or ecx, 0xffffffff // c70001000000 | mov dword ptr [eax], 1 // 8d5008 | lea edx, [eax + 8] // 33c0 | xor eax, eax // f2ae | repne scasb al, byte ptr es:[edi] // f7d1 | not ecx condition: 7 of them and filesize < 32768 }
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