Actor(s): Comment Crew
There is no description at this point.
rule win_webc2_ugx_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.webc2_ugx." 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_ugx" 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 = { 8d8628070000 50 57 ff969c060000 } // n = 4, score = 100 // 8d8628070000 | lea eax, [esi + 0x728] // 50 | push eax // 57 | push edi // ff969c060000 | call dword ptr [esi + 0x69c] $sequence_1 = { 83c418 8d45f0 50 8d45ac 50 53 53 } // n = 7, score = 100 // 83c418 | add esp, 0x18 // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // 8d45ac | lea eax, [ebp - 0x54] // 50 | push eax // 53 | push ebx // 53 | push ebx $sequence_2 = { ff55f4 e9???????? 53 68000100c4 53 8d85ccfeffff } // n = 6, score = 100 // ff55f4 | call dword ptr [ebp - 0xc] // e9???????? | // 53 | push ebx // 68000100c4 | push 0xc4000100 // 53 | push ebx // 8d85ccfeffff | lea eax, [ebp - 0x134] $sequence_3 = { 8d8524ffffff 50 53 53 6a10 6a01 53 } // n = 7, score = 100 // 8d8524ffffff | lea eax, [ebp - 0xdc] // 50 | push eax // 53 | push ebx // 53 | push ebx // 6a10 | push 0x10 // 6a01 | push 1 // 53 | push ebx $sequence_4 = { eb1c 8d86ee0c0000 50 8d85e8feffff 50 } // n = 5, score = 100 // eb1c | jmp 0x1e // 8d86ee0c0000 | lea eax, [esi + 0xcee] // 50 | push eax // 8d85e8feffff | lea eax, [ebp - 0x118] // 50 | push eax $sequence_5 = { 83600400 c3 83790400 7508 6a00 e8???????? 59 } // n = 7, score = 100 // 83600400 | and dword ptr [eax + 4], 0 // c3 | ret // 83790400 | cmp dword ptr [ecx + 4], 0 // 7508 | jne 0xa // 6a00 | push 0 // e8???????? | // 59 | pop ecx $sequence_6 = { 895dfc bf???????? 897ddc be???????? } // n = 4, score = 100 // 895dfc | mov dword ptr [ebp - 4], ebx // bf???????? | // 897ddc | mov dword ptr [ebp - 0x24], edi // be???????? | $sequence_7 = { ff969c060000 3bc3 894588 0f84bf050000 8d868e0a0000 50 57 } // n = 7, score = 100 // ff969c060000 | call dword ptr [esi + 0x69c] // 3bc3 | cmp eax, ebx // 894588 | mov dword ptr [ebp - 0x78], eax // 0f84bf050000 | je 0x5c5 // 8d868e0a0000 | lea eax, [esi + 0xa8e] // 50 | push eax // 57 | push edi $sequence_8 = { 3bc3 8945a4 0f84a6050000 8d8640080000 50 } // n = 5, score = 100 // 3bc3 | cmp eax, ebx // 8945a4 | mov dword ptr [ebp - 0x5c], eax // 0f84a6050000 | je 0x5ac // 8d8640080000 | lea eax, [esi + 0x840] // 50 | push eax $sequence_9 = { 8d85a8feffff 68???????? 50 ffd6 8d85a8feffff 68???????? 50 } // n = 7, score = 100 // 8d85a8feffff | lea eax, [ebp - 0x158] // 68???????? | // 50 | push eax // ffd6 | call esi // 8d85a8feffff | lea eax, [ebp - 0x158] // 68???????? | // 50 | push eax condition: 7 of them and filesize < 57344 }
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