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rule win_bouncer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.bouncer." 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.bouncer" 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 = { 59 8bf3 894510 6a00 f3a5 ff7308 ff7510 } // n = 7, score = 100 // 59 | pop ecx // 8bf3 | mov esi, ebx // 894510 | mov dword ptr [ebp + 0x10], eax // 6a00 | push 0 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // ff7308 | push dword ptr [ebx + 8] // ff7510 | push dword ptr [ebp + 0x10] $sequence_1 = { e8???????? 8d85a4faffff c645c82e 50 e8???????? } // n = 5, score = 100 // e8???????? | // 8d85a4faffff | lea eax, dword ptr [ebp - 0x55c] // c645c82e | mov byte ptr [ebp - 0x38], 0x2e // 50 | push eax // e8???????? | $sequence_2 = { e8???????? ff75f8 6a01 e8???????? 8bc6 5e } // n = 6, score = 100 // e8???????? | // ff75f8 | push dword ptr [ebp - 8] // 6a01 | push 1 // e8???????? | // 8bc6 | mov eax, esi // 5e | pop esi $sequence_3 = { c3 8b542404 51 51 50 68???????? 51 } // n = 7, score = 100 // c3 | ret // 8b542404 | mov edx, dword ptr [esp + 4] // 51 | push ecx // 51 | push ecx // 50 | push eax // 68???????? | // 51 | push ecx $sequence_4 = { eb03 8b45fc 40 50 ff15???????? 8bf8 } // n = 6, score = 100 // eb03 | jmp 5 // 8b45fc | mov eax, dword ptr [ebp - 4] // 40 | inc eax // 50 | push eax // ff15???????? | // 8bf8 | mov edi, eax $sequence_5 = { 56 e8???????? 8d85a4faffff 50 e8???????? 50 8d85a4faffff } // n = 7, score = 100 // 56 | push esi // e8???????? | // 8d85a4faffff | lea eax, dword ptr [ebp - 0x55c] // 50 | push eax // e8???????? | // 50 | push eax // 8d85a4faffff | lea eax, dword ptr [ebp - 0x55c] $sequence_6 = { ff35???????? ebea e8???????? 59 5f 5e 5b } // n = 7, score = 100 // ff35???????? | // ebea | jmp 0xffffffec // e8???????? | // 59 | pop ecx // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_7 = { 7434 8d45ec 6a00 50 8d4604 50 8d45fc } // n = 7, score = 100 // 7434 | je 0x36 // 8d45ec | lea eax, dword ptr [ebp - 0x14] // 6a00 | push 0 // 50 | push eax // 8d4604 | lea eax, dword ptr [esi + 4] // 50 | push eax // 8d45fc | lea eax, dword ptr [ebp - 4] $sequence_8 = { ff15???????? 807d1054 8945f0 7504 53 56 } // n = 6, score = 100 // ff15???????? | // 807d1054 | cmp byte ptr [ebp + 0x10], 0x54 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 7504 | jne 6 // 53 | push ebx // 56 | push esi $sequence_9 = { 897db0 8975c4 ff750c 8975bc 8975c0 } // n = 5, score = 100 // 897db0 | mov dword ptr [ebp - 0x50], edi // 8975c4 | mov dword ptr [ebp - 0x3c], esi // ff750c | push dword ptr [ebp + 0xc] // 8975bc | mov dword ptr [ebp - 0x44], esi // 8975c0 | mov dword ptr [ebp - 0x40], esi condition: 7 of them and filesize < 335872 }
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