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rule win_underminer_ek_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.underminer_ek." 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.underminer_ek" 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 = { 0303 50 e8???????? 837e1410 7205 8b36 8975fc } // n = 7, score = 100 // 0303 | add eax, dword ptr [ebx] // 50 | push eax // e8???????? | // 837e1410 | cmp dword ptr [esi + 0x14], 0x10 // 7205 | jb 7 // 8b36 | mov esi, dword ptr [esi] // 8975fc | mov dword ptr [ebp - 4], esi $sequence_1 = { 0305???????? 5f 03c1 0115???????? } // n = 4, score = 100 // 0305???????? | // 5f | pop edi // 03c1 | add eax, ecx // 0115???????? | $sequence_2 = { ff75f8 56 53 e8???????? 83c414 5f } // n = 6, score = 100 // ff75f8 | push dword ptr [ebp - 8] // 56 | push esi // 53 | push ebx // e8???????? | // 83c414 | add esp, 0x14 // 5f | pop edi $sequence_3 = { 684e34fa7e ff7508 53 e8???????? 83c410 85c0 750c } // n = 7, score = 100 // 684e34fa7e | push 0x7efa344e // ff7508 | push dword ptr [ebp + 8] // 53 | push ebx // e8???????? | // 83c410 | add esp, 0x10 // 85c0 | test eax, eax // 750c | jne 0xe $sequence_4 = { 0135???????? 33c2 8d9335f23abd 0345d8 } // n = 4, score = 100 // 0135???????? | // 33c2 | xor eax, edx // 8d9335f23abd | lea edx, [ebx - 0x42c50dcb] // 0345d8 | add eax, dword ptr [ebp - 0x28] $sequence_5 = { 7404 3bc1 7501 48 } // n = 4, score = 100 // 7404 | je 6 // 3bc1 | cmp eax, ecx // 7501 | jne 3 // 48 | dec eax $sequence_6 = { 03048d582c4300 eb05 b8???????? f6402820 } // n = 4, score = 100 // 03048d582c4300 | add eax, dword ptr [ecx*4 + 0x432c58] // eb05 | jmp 7 // b8???????? | // f6402820 | test byte ptr [eax + 0x28], 0x20 $sequence_7 = { 3bc5 7547 3b6b04 7242 } // n = 4, score = 100 // 3bc5 | cmp eax, ebp // 7547 | jne 0x49 // 3b6b04 | cmp ebp, dword ptr [ebx + 4] // 7242 | jb 0x44 $sequence_8 = { e8???????? 83c40c 8b4d08 03de 3b4d0c } // n = 5, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 8b4d08 | mov ecx, dword ptr [ebp + 8] // 03de | add ebx, esi // 3b4d0c | cmp ecx, dword ptr [ebp + 0xc] $sequence_9 = { 03048d582c4300 50 ff15???????? 5d } // n = 4, score = 100 // 03048d582c4300 | add eax, dword ptr [ecx*4 + 0x432c58] // 50 | push eax // ff15???????? | // 5d | pop ebp $sequence_10 = { 8907 59 895704 e9???????? } // n = 4, score = 100 // 8907 | mov dword ptr [edi], eax // 59 | pop ecx // 895704 | mov dword ptr [edi + 4], edx // e9???????? | $sequence_11 = { 895df4 e8???????? 85c0 59 742b } // n = 5, score = 100 // 895df4 | mov dword ptr [ebp - 0xc], ebx // e8???????? | // 85c0 | test eax, eax // 59 | pop ecx // 742b | je 0x2d $sequence_12 = { 0f8537010000 0fb74614 6a40 6800101000 ff7650 } // n = 5, score = 100 // 0f8537010000 | jne 0x13d // 0fb74614 | movzx eax, word ptr [esi + 0x14] // 6a40 | push 0x40 // 6800101000 | push 0x101000 // ff7650 | push dword ptr [esi + 0x50] $sequence_13 = { 03148d582c4300 8b00 894218 8a441f04 } // n = 4, score = 100 // 03148d582c4300 | add edx, dword ptr [ecx*4 + 0x432c58] // 8b00 | mov eax, dword ptr [eax] // 894218 | mov dword ptr [edx + 0x18], eax // 8a441f04 | mov al, byte ptr [edi + ebx + 4] $sequence_14 = { 010d???????? 0bf1 33f2 0375d4 } // n = 4, score = 100 // 010d???????? | // 0bf1 | or esi, ecx // 33f2 | xor esi, edx // 0375d4 | add esi, dword ptr [ebp - 0x2c] condition: 7 of them and filesize < 466944 }
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