Actor(s): Tick
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rule win_broler_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.broler." 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.broler" 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 = { 68???????? 8d45e0 50 c745e05c324100 } // n = 4, score = 100 // 68???????? | // 8d45e0 | lea eax, [ebp - 0x20] // 50 | push eax // c745e05c324100 | mov dword ptr [ebp - 0x20], 0x41325c $sequence_1 = { 720f 8b8d8cfeffff 51 e8???????? 83c404 68e8030000 ff15???????? } // n = 7, score = 100 // 720f | jb 0x11 // 8b8d8cfeffff | mov ecx, dword ptr [ebp - 0x174] // 51 | push ecx // e8???????? | // 83c404 | add esp, 4 // 68e8030000 | push 0x3e8 // ff15???????? | $sequence_2 = { 33049d08784100 8b5dfc 3343fc 8bd9 8945f4 c1fb10 81e3ff000000 } // n = 7, score = 100 // 33049d08784100 | xor eax, dword ptr [ebx*4 + 0x417808] // 8b5dfc | mov ebx, dword ptr [ebp - 4] // 3343fc | xor eax, dword ptr [ebx - 4] // 8bd9 | mov ebx, ecx // 8945f4 | mov dword ptr [ebp - 0xc], eax // c1fb10 | sar ebx, 0x10 // 81e3ff000000 | and ebx, 0xff $sequence_3 = { ff15???????? 6a00 8d8568edffff 50 } // n = 4, score = 100 // ff15???????? | // 6a00 | push 0 // 8d8568edffff | lea eax, [ebp - 0x1298] // 50 | push eax $sequence_4 = { 897de8 895de4 885dd4 720c 8b4508 50 } // n = 6, score = 100 // 897de8 | mov dword ptr [ebp - 0x18], edi // 895de4 | mov dword ptr [ebp - 0x1c], ebx // 885dd4 | mov byte ptr [ebp - 0x2c], bl // 720c | jb 0xe // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax $sequence_5 = { 8d75b8 e8???????? c645fc01 8b4518 8d7310 3bc3 730a } // n = 7, score = 100 // 8d75b8 | lea esi, [ebp - 0x48] // e8???????? | // c645fc01 | mov byte ptr [ebp - 4], 1 // 8b4518 | mov eax, dword ptr [ebp + 0x18] // 8d7310 | lea esi, [ebx + 0x10] // 3bc3 | cmp eax, ebx // 730a | jae 0xc $sequence_6 = { b8???????? 8db5d4fdffff c785e8fdffff0f000000 899de4fdffff 889dd4fdffff e8???????? bf01000000 } // n = 7, score = 100 // b8???????? | // 8db5d4fdffff | lea esi, [ebp - 0x22c] // c785e8fdffff0f000000 | mov dword ptr [ebp - 0x218], 0xf // 899de4fdffff | mov dword ptr [ebp - 0x21c], ebx // 889dd4fdffff | mov byte ptr [ebp - 0x22c], bl // e8???????? | // bf01000000 | mov edi, 1 $sequence_7 = { e9???????? 50 8d459c 50 e8???????? 897dfc 8b75ac } // n = 7, score = 100 // e9???????? | // 50 | push eax // 8d459c | lea eax, [ebp - 0x64] // 50 | push eax // e8???????? | // 897dfc | mov dword ptr [ebp - 4], edi // 8b75ac | mov esi, dword ptr [ebp - 0x54] $sequence_8 = { 0fb67003 0fb65809 57 0fb67805 0bce } // n = 5, score = 100 // 0fb67003 | movzx esi, byte ptr [eax + 3] // 0fb65809 | movzx ebx, byte ptr [eax + 9] // 57 | push edi // 0fb67805 | movzx edi, byte ptr [eax + 5] // 0bce | or ecx, esi $sequence_9 = { 85c0 7505 e8???????? 8d855cfeffff 50 8d8d74feffff 51 } // n = 7, score = 100 // 85c0 | test eax, eax // 7505 | jne 7 // e8???????? | // 8d855cfeffff | lea eax, [ebp - 0x1a4] // 50 | push eax // 8d8d74feffff | lea ecx, [ebp - 0x18c] // 51 | push ecx condition: 7 of them and filesize < 275456 }
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