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rule win_collectorgoomba_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.collectorgoomba." 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.collectorgoomba" 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 = { ff75fc 6a39 ff75e0 e8???????? 83c41c ff750c e8???????? } // n = 7, score = 200 // ff75fc | push dword ptr [ebp - 4] // 6a39 | push 0x39 // ff75e0 | push dword ptr [ebp - 0x20] // e8???????? | // 83c41c | add esp, 0x1c // ff750c | push dword ptr [ebp + 0xc] // e8???????? | $sequence_1 = { eb9a c9 c3 55 8bec 51 51 } // n = 7, score = 200 // eb9a | jmp 0xffffff9c // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 51 | push ecx $sequence_2 = { ff7038 e8???????? 59 59 8b45fc 40 8b4d08 } // n = 7, score = 200 // ff7038 | push dword ptr [eax + 0x38] // e8???????? | // 59 | pop ecx // 59 | pop ecx // 8b45fc | mov eax, dword ptr [ebp - 4] // 40 | inc eax // 8b4d08 | mov ecx, dword ptr [ebp + 8] $sequence_3 = { ff7508 e8???????? 59 8945f8 837df800 7408 8b45f8 } // n = 7, score = 200 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 59 | pop ecx // 8945f8 | mov dword ptr [ebp - 8], eax // 837df800 | cmp dword ptr [ebp - 8], 0 // 7408 | je 0xa // 8b45f8 | mov eax, dword ptr [ebp - 8] $sequence_4 = { ff7510 8b4dfc e8???????? 034508 50 e8???????? 83c40c } // n = 7, score = 200 // ff7510 | push dword ptr [ebp + 0x10] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // e8???????? | // 034508 | add eax, dword ptr [ebp + 8] // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc $sequence_5 = { eb07 8b45e8 40 8945e8 837dfc00 0f8ed1000000 8b45fc } // n = 7, score = 200 // eb07 | jmp 9 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] // 40 | inc eax // 8945e8 | mov dword ptr [ebp - 0x18], eax // 837dfc00 | cmp dword ptr [ebp - 4], 0 // 0f8ed1000000 | jle 0xd7 // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_6 = { ff75a8 ff75d4 ffb54cffffff ff75f8 e8???????? 83c414 837de400 } // n = 7, score = 200 // ff75a8 | push dword ptr [ebp - 0x58] // ff75d4 | push dword ptr [ebp - 0x2c] // ffb54cffffff | push dword ptr [ebp - 0xb4] // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 83c414 | add esp, 0x14 // 837de400 | cmp dword ptr [ebp - 0x1c], 0 $sequence_7 = { ff75f0 6a6d ff75f8 e8???????? 83c41c 8b45fc 6b0030 } // n = 7, score = 200 // ff75f0 | push dword ptr [ebp - 0x10] // 6a6d | push 0x6d // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 83c41c | add esp, 0x1c // 8b45fc | mov eax, dword ptr [ebp - 4] // 6b0030 | imul eax, dword ptr [eax], 0x30 $sequence_8 = { eb13 837df409 740d ff75e8 ff75f8 e8???????? 59 } // n = 7, score = 200 // eb13 | jmp 0x15 // 837df409 | cmp dword ptr [ebp - 0xc], 9 // 740d | je 0xf // ff75e8 | push dword ptr [ebp - 0x18] // ff75f8 | push dword ptr [ebp - 8] // e8???????? | // 59 | pop ecx $sequence_9 = { 8945f0 837df400 0f8e99000000 8b45dc 83e804 3945f4 7e08 } // n = 7, score = 200 // 8945f0 | mov dword ptr [ebp - 0x10], eax // 837df400 | cmp dword ptr [ebp - 0xc], 0 // 0f8e99000000 | jle 0x9f // 8b45dc | mov eax, dword ptr [ebp - 0x24] // 83e804 | sub eax, 4 // 3945f4 | cmp dword ptr [ebp - 0xc], eax // 7e08 | jle 0xa condition: 7 of them and filesize < 1400832 }
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