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rule win_bouncer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 895d14 7412 81fb12030900 740a 3bde } // n = 5, score = 200 // 895d14 | mov dword ptr [ebp + 0x14], ebx // 7412 | je 0x14 // 81fb12030900 | cmp ebx, 0x90312 // 740a | je 0xc // 3bde | cmp ebx, esi $sequence_1 = { e9???????? 68???????? ff750c e8???????? 03450c 59 50 } // n = 7, score = 200 // e9???????? | // 68???????? | // ff750c | push dword ptr [ebp + 0xc] // e8???????? | // 03450c | add eax, dword ptr [ebp + 0xc] // 59 | pop ecx // 50 | push eax $sequence_2 = { ff15???????? 83c40c 68???????? 68???????? 8935???????? ffd7 } // n = 6, score = 200 // ff15???????? | // 83c40c | add esp, 0xc // 68???????? | // 68???????? | // 8935???????? | // ffd7 | call edi $sequence_3 = { c645c82e 50 e8???????? 8945dc 8d45c8 } // n = 5, score = 200 // c645c82e | mov byte ptr [ebp - 0x38], 0x2e // 50 | push eax // e8???????? | // 8945dc | mov dword ptr [ebp - 0x24], eax // 8d45c8 | lea eax, [ebp - 0x38] $sequence_4 = { 750e 837d0c00 68???????? e9???????? 837d0c00 e9???????? 55 } // n = 7, score = 200 // 750e | jne 0x10 // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // 68???????? | // e9???????? | // 837d0c00 | cmp dword ptr [ebp + 0xc], 0 // e9???????? | // 55 | push ebp $sequence_5 = { 8b45d8 8d701c 56 ff15???????? 8bd8 8d45dc } // n = 6, score = 200 // 8b45d8 | mov eax, dword ptr [ebp - 0x28] // 8d701c | lea esi, [eax + 0x1c] // 56 | push esi // ff15???????? | // 8bd8 | mov ebx, eax // 8d45dc | lea eax, [ebp - 0x24] $sequence_6 = { 8b45f0 3bc3 8945f8 0f8515010000 } // n = 4, score = 200 // 8b45f0 | mov eax, dword ptr [ebp - 0x10] // 3bc3 | cmp eax, ebx // 8945f8 | mov dword ptr [ebp - 8], eax // 0f8515010000 | jne 0x11b $sequence_7 = { 50 e8???????? 8d85a0fbffff 50 e8???????? 8bf8 83c71c } // n = 7, score = 200 // 50 | push eax // e8???????? | // 8d85a0fbffff | lea eax, [ebp - 0x460] // 50 | push eax // e8???????? | // 8bf8 | mov edi, eax // 83c71c | add edi, 0x1c $sequence_8 = { 8b45e0 8945b0 8b45e4 8945c8 } // n = 4, score = 200 // 8b45e0 | mov eax, dword ptr [ebp - 0x20] // 8945b0 | mov dword ptr [ebp - 0x50], eax // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 8945c8 | mov dword ptr [ebp - 0x38], eax $sequence_9 = { 48 7417 48 752f } // n = 4, score = 200 // 48 | dec eax // 7417 | je 0x19 // 48 | dec eax // 752f | jne 0x31 condition: 7 of them and filesize < 335872 }
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