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rule win_gameover_dga_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { 6a14 33c9 8d90b2010000 8d45d4 50 6aff e8???????? } // n = 7, score = 700 // 6a14 | push 0x14 // 33c9 | xor ecx, ecx // 8d90b2010000 | lea edx, [eax + 0x1b2] // 8d45d4 | lea eax, [ebp - 0x2c] // 50 | push eax // 6aff | push -1 // e8???????? | $sequence_1 = { 741e 3bcb 0f8391010000 8b7c242c 0fb601 41 3bc2 } // n = 7, score = 700 // 741e | je 0x20 // 3bcb | cmp ecx, ebx // 0f8391010000 | jae 0x197 // 8b7c242c | mov edi, dword ptr [esp + 0x2c] // 0fb601 | movzx eax, byte ptr [ecx] // 41 | inc ecx // 3bc2 | cmp eax, edx $sequence_2 = { e8???????? 33db f6450001 6a02 895c2418 5f 7411 } // n = 7, score = 700 // e8???????? | // 33db | xor ebx, ebx // f6450001 | test byte ptr [ebp], 1 // 6a02 | push 2 // 895c2418 | mov dword ptr [esp + 0x18], ebx // 5f | pop edi // 7411 | je 0x13 $sequence_3 = { 7521 8b07 85c0 741b 6a04 83c004 8d4c2428 } // n = 7, score = 700 // 7521 | jne 0x23 // 8b07 | mov eax, dword ptr [edi] // 85c0 | test eax, eax // 741b | je 0x1d // 6a04 | push 4 // 83c004 | add eax, 4 // 8d4c2428 | lea ecx, [esp + 0x28] $sequence_4 = { 3b4c2418 0f846ce4ffff 837c241c00 0f854b0d0000 83c0fa 895c2428 83f80f } // n = 7, score = 700 // 3b4c2418 | cmp ecx, dword ptr [esp + 0x18] // 0f846ce4ffff | je 0xffffe472 // 837c241c00 | cmp dword ptr [esp + 0x1c], 0 // 0f854b0d0000 | jne 0xd51 // 83c0fa | add eax, -6 // 895c2428 | mov dword ptr [esp + 0x28], ebx // 83f80f | cmp eax, 0xf $sequence_5 = { 5f 5e 8be5 5d c20400 81ecbc000000 53 } // n = 7, score = 700 // 5f | pop edi // 5e | pop esi // 8be5 | mov esp, ebp // 5d | pop ebp // c20400 | ret 4 // 81ecbc000000 | sub esp, 0xbc // 53 | push ebx $sequence_6 = { ff742428 ffd6 ff742424 ffd6 8d4c241c e8???????? 385c2413 } // n = 7, score = 700 // ff742428 | push dword ptr [esp + 0x28] // ffd6 | call esi // ff742424 | push dword ptr [esp + 0x24] // ffd6 | call esi // 8d4c241c | lea ecx, [esp + 0x1c] // e8???????? | // 385c2413 | cmp byte ptr [esp + 0x13], bl $sequence_7 = { 40 89442428 3bc2 7edc 3bd1 } // n = 5, score = 700 // 40 | inc eax // 89442428 | mov dword ptr [esp + 0x28], eax // 3bc2 | cmp eax, edx // 7edc | jle 0xffffffde // 3bd1 | cmp edx, ecx $sequence_8 = { a1???????? 68???????? ff7064 ffd6 85c0 7504 } // n = 6, score = 700 // a1???????? | // 68???????? | // ff7064 | push dword ptr [eax + 0x64] // ffd6 | call esi // 85c0 | test eax, eax // 7504 | jne 6 $sequence_9 = { 8bf1 837e0c00 c706???????? 7409 ff760c ff15???????? 837e0800 } // n = 7, score = 700 // 8bf1 | mov esi, ecx // 837e0c00 | cmp dword ptr [esi + 0xc], 0 // c706???????? | // 7409 | je 0xb // ff760c | push dword ptr [esi + 0xc] // ff15???????? | // 837e0800 | cmp dword ptr [esi + 8], 0 condition: 7 of them and filesize < 540672 }
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