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rule win_gameover_dga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" version = "1" description = "Detects win.gameover_dga." 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.gameover_dga" malpedia_rule_date = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 884617 33c0 40 e9???????? 8a4601 33db 8b6c2434 } // n = 7, score = 700 // 884617 | mov byte ptr [esi + 0x17], al // 33c0 | xor eax, eax // 40 | inc eax // e9???????? | // 8a4601 | mov al, byte ptr [esi + 1] // 33db | xor ebx, ebx // 8b6c2434 | mov ebp, dword ptr [esp + 0x34] $sequence_1 = { 397e08 0f84f0000000 8be9 894c2414 8bd1 8b4604 8a0c03 } // n = 7, score = 700 // 397e08 | cmp dword ptr [esi + 8], edi // 0f84f0000000 | je 0xf6 // 8be9 | mov ebp, ecx // 894c2414 | mov dword ptr [esp + 0x14], ecx // 8bd1 | mov edx, ecx // 8b4604 | mov eax, dword ptr [esi + 4] // 8a0c03 | mov cl, byte ptr [ebx + eax] $sequence_2 = { 48 7544 397714 763f 8b4710 ff34b0 } // n = 6, score = 700 // 48 | dec eax // 7544 | jne 0x46 // 397714 | cmp dword ptr [edi + 0x14], esi // 763f | jbe 0x41 // 8b4710 | mov eax, dword ptr [edi + 0x10] // ff34b0 | push dword ptr [eax + esi*4] $sequence_3 = { 833d????????00 7566 8d8de8fdffff e8???????? 51 be???????? 56 } // n = 7, score = 700 // 833d????????00 | // 7566 | jne 0x68 // 8d8de8fdffff | lea ecx, [ebp - 0x218] // e8???????? | // 51 | push ecx // be???????? | // 56 | push esi $sequence_4 = { 5f 5b c20c00 8bcf e8???????? 8bf0 } // n = 6, score = 700 // 5f | pop edi // 5b | pop ebx // c20c00 | ret 0xc // 8bcf | mov ecx, edi // e8???????? | // 8bf0 | mov esi, eax $sequence_5 = { 56 ff15???????? 85c0 7443 56 be???????? 8d85f8fdffff } // n = 7, score = 700 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 7443 | je 0x45 // 56 | push esi // be???????? | // 8d85f8fdffff | lea eax, [ebp - 0x208] $sequence_6 = { 8b84245c010000 40 e9???????? 8b476c 33c9 2bc3 } // n = 6, score = 700 // 8b84245c010000 | mov eax, dword ptr [esp + 0x15c] // 40 | inc eax // e9???????? | // 8b476c | mov eax, dword ptr [edi + 0x6c] // 33c9 | xor ecx, ecx // 2bc3 | sub eax, ebx $sequence_7 = { ff760c ff7608 6a10 e8???????? 84c0 0f847a010000 8364241c00 } // n = 7, score = 700 // ff760c | push dword ptr [esi + 0xc] // ff7608 | push dword ptr [esi + 8] // 6a10 | push 0x10 // e8???????? | // 84c0 | test al, al // 0f847a010000 | je 0x180 // 8364241c00 | and dword ptr [esp + 0x1c], 0 $sequence_8 = { e8???????? a1???????? ff7064 ff15???????? 6a53 8d55b8 8bf0 } // n = 7, score = 700 // e8???????? | // a1???????? | // ff7064 | push dword ptr [eax + 0x64] // ff15???????? | // 6a53 | push 0x53 // 8d55b8 | lea edx, [ebp - 0x48] // 8bf0 | mov esi, eax $sequence_9 = { 7510 8b4f10 e8???????? 85c0 75e5 32c0 } // n = 6, score = 700 // 7510 | jne 0x12 // 8b4f10 | mov ecx, dword ptr [edi + 0x10] // e8???????? | // 85c0 | test eax, eax // 75e5 | jne 0xffffffe7 // 32c0 | xor al, al condition: 7 of them and filesize < 540672 }
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