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rule win_corebot_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.corebot." 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.corebot" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 57 56 89ce 31db } // n = 4, score = 1100 // 57 | push edi // 56 | push esi // 89ce | mov esi, ecx // 31db | xor ebx, ebx $sequence_1 = { 8b4514 8b4d10 8b55f0 8911 8930 } // n = 5, score = 1100 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // 8b4d10 | mov ecx, dword ptr [ebp + 0x10] // 8b55f0 | mov edx, dword ptr [ebp - 0x10] // 8911 | mov dword ptr [ecx], edx // 8930 | mov dword ptr [eax], esi $sequence_2 = { 31c0 5e 5d c20800 55 89e5 } // n = 6, score = 1100 // 31c0 | xor eax, eax // 5e | pop esi // 5d | pop ebp // c20800 | ret 8 // 55 | push ebp // 89e5 | mov ebp, esp $sequence_3 = { 8b4110 83c110 eb24 8b4104 8d70ff } // n = 5, score = 1100 // 8b4110 | mov eax, dword ptr [ecx + 0x10] // 83c110 | add ecx, 0x10 // eb24 | jmp 0x26 // 8b4104 | mov eax, dword ptr [ecx + 4] // 8d70ff | lea esi, [eax - 1] $sequence_4 = { 89e5 56 89ce 8b4604 } // n = 4, score = 1100 // 89e5 | mov ebp, esp // 56 | push esi // 89ce | mov esi, ecx // 8b4604 | mov eax, dword ptr [esi + 4] $sequence_5 = { 39fe 73ea 8b4310 8945ec 50 e8???????? } // n = 6, score = 1100 // 39fe | cmp esi, edi // 73ea | jae 0xffffffec // 8b4310 | mov eax, dword ptr [ebx + 0x10] // 8945ec | mov dword ptr [ebp - 0x14], eax // 50 | push eax // e8???????? | $sequence_6 = { 8b0e 6a00 ff750c ff7508 } // n = 4, score = 1100 // 8b0e | mov ecx, dword ptr [esi] // 6a00 | push 0 // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] $sequence_7 = { 50 e8???????? 83c404 29f7 01f3 8b75ec 56 } // n = 7, score = 1100 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 29f7 | sub edi, esi // 01f3 | add ebx, esi // 8b75ec | mov esi, dword ptr [ebp - 0x14] // 56 | push esi $sequence_8 = { eb10 6800800000 6a00 56 } // n = 4, score = 1000 // eb10 | jmp 0x12 // 6800800000 | push 0x8000 // 6a00 | push 0 // 56 | push esi $sequence_9 = { ff15???????? 807e5000 7509 ff764c } // n = 4, score = 1000 // ff15???????? | // 807e5000 | cmp byte ptr [esi + 0x50], 0 // 7509 | jne 0xb // ff764c | push dword ptr [esi + 0x4c] $sequence_10 = { 85ff 740f 57 ff7508 } // n = 4, score = 1000 // 85ff | test edi, edi // 740f | je 0x11 // 57 | push edi // ff7508 | push dword ptr [ebp + 8] $sequence_11 = { ff15???????? 8d4634 50 ff15???????? 8d4e0c } // n = 5, score = 1000 // ff15???????? | // 8d4634 | lea eax, [esi + 0x34] // 50 | push eax // ff15???????? | // 8d4e0c | lea ecx, [esi + 0xc] $sequence_12 = { 807e5800 7509 ff7654 ff15???????? 807e5000 } // n = 5, score = 1000 // 807e5800 | cmp byte ptr [esi + 0x58], 0 // 7509 | jne 0xb // ff7654 | push dword ptr [esi + 0x54] // ff15???????? | // 807e5000 | cmp byte ptr [esi + 0x50], 0 $sequence_13 = { 85c0 7515 8b4624 3b4620 } // n = 4, score = 1000 // 85c0 | test eax, eax // 7515 | jne 0x17 // 8b4624 | mov eax, dword ptr [esi + 0x24] // 3b4620 | cmp eax, dword ptr [esi + 0x20] $sequence_14 = { ff7010 ff7014 e8???????? 8b45e0 } // n = 4, score = 1000 // ff7010 | push dword ptr [eax + 0x10] // ff7014 | push dword ptr [eax + 0x14] // e8???????? | // 8b45e0 | mov eax, dword ptr [ebp - 0x20] $sequence_15 = { ff742428 e8???????? 8b442424 8d4c2410 } // n = 4, score = 1000 // ff742428 | push dword ptr [esp + 0x28] // e8???????? | // 8b442424 | mov eax, dword ptr [esp + 0x24] // 8d4c2410 | lea ecx, [esp + 0x10] condition: 7 of them and filesize < 1302528 }
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