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rule win_bouncer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 0f851df1ffff 6a1c 8d45dc 53 50 e8???????? } // n = 6, score = 200 // 0f851df1ffff | jne 0xfffff123 // 6a1c | push 0x1c // 8d45dc | lea eax, [ebp - 0x24] // 53 | push ebx // 50 | push eax // e8???????? | $sequence_1 = { 7413 807d1055 7411 6a05 56 ff15???????? } // n = 6, score = 200 // 7413 | je 0x15 // 807d1055 | cmp byte ptr [ebp + 0x10], 0x55 // 7411 | je 0x13 // 6a05 | push 5 // 56 | push esi // ff15???????? | $sequence_2 = { 83c104 3bc6 72f4 3bc6 7512 83fe40 730d } // n = 7, score = 200 // 83c104 | add ecx, 4 // 3bc6 | cmp eax, esi // 72f4 | jb 0xfffffff6 // 3bc6 | cmp eax, esi // 7512 | jne 0x14 // 83fe40 | cmp esi, 0x40 // 730d | jae 0xf $sequence_3 = { 8bd8 66c745e00200 ff15???????? 8b35???????? } // n = 4, score = 200 // 8bd8 | mov ebx, eax // 66c745e00200 | mov word ptr [ebp - 0x20], 2 // ff15???????? | // 8b35???????? | $sequence_4 = { 8d848db8feffff 8b5004 41 8910 8b95b4feffff 83c004 4a } // n = 7, score = 200 // 8d848db8feffff | lea eax, [ebp + ecx*4 - 0x148] // 8b5004 | mov edx, dword ptr [eax + 4] // 41 | inc ecx // 8910 | mov dword ptr [eax], edx // 8b95b4feffff | mov edx, dword ptr [ebp - 0x14c] // 83c004 | add eax, 4 // 4a | dec edx $sequence_5 = { 7509 c6843d34ffffff0a 47 6a06 8d8534ffffff } // n = 5, score = 200 // 7509 | jne 0xb // c6843d34ffffff0a | mov byte ptr [ebp + edi - 0xcc], 0xa // 47 | inc edi // 6a06 | push 6 // 8d8534ffffff | lea eax, [ebp - 0xcc] $sequence_6 = { ff75e4 ff15???????? 895de4 e9???????? 80f916 0f855f020000 8b45f0 } // n = 7, score = 200 // ff75e4 | push dword ptr [ebp - 0x1c] // ff15???????? | // 895de4 | mov dword ptr [ebp - 0x1c], ebx // e9???????? | // 80f916 | cmp cl, 0x16 // 0f855f020000 | jne 0x265 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] $sequence_7 = { 83c40c e9???????? 68???????? bf???????? 68???????? 57 } // n = 6, score = 200 // 83c40c | add esp, 0xc // e9???????? | // 68???????? | // bf???????? | // 68???????? | // 57 | push edi $sequence_8 = { 8975c4 899db4feffff e8???????? 83c40c 83f8ff } // n = 5, score = 200 // 8975c4 | mov dword ptr [ebp - 0x3c], esi // 899db4feffff | mov dword ptr [ebp - 0x14c], ebx // e8???????? | // 83c40c | add esp, 0xc // 83f8ff | cmp eax, -1 $sequence_9 = { 83ec14 53 56 57 6a01 5e 33db } // n = 7, score = 200 // 83ec14 | sub esp, 0x14 // 53 | push ebx // 56 | push esi // 57 | push edi // 6a01 | push 1 // 5e | pop esi // 33db | xor ebx, ebx condition: 7 of them and filesize < 335872 }
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