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rule win_nymaim2_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.nymaim2." 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.nymaim2" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 56 e8???????? 8b4508 8b4dec 83c448 0fb7444354 ff3481 } // n = 7, score = 200 // 56 | push esi // e8???????? | // 8b4508 | mov eax, dword ptr [ebp + 8] // 8b4dec | mov ecx, dword ptr [ebp - 0x14] // 83c448 | add esp, 0x48 // 0fb7444354 | movzx eax, word ptr [ebx + eax*2 + 0x54] // ff3481 | push dword ptr [ecx + eax*4] $sequence_1 = { 83780800 75c2 ff400c ebbd 8b5620 8b461c 8d4af8 } // n = 7, score = 200 // 83780800 | cmp dword ptr [eax + 8], 0 // 75c2 | jne 0xffffffc4 // ff400c | inc dword ptr [eax + 0xc] // ebbd | jmp 0xffffffbf // 8b5620 | mov edx, dword ptr [esi + 0x20] // 8b461c | mov eax, dword ptr [esi + 0x1c] // 8d4af8 | lea ecx, [edx - 8] $sequence_2 = { e8???????? 8d4de8 c645fc07 e8???????? 395dd8 895d08 7e51 } // n = 7, score = 200 // e8???????? | // 8d4de8 | lea ecx, [ebp - 0x18] // c645fc07 | mov byte ptr [ebp - 4], 7 // e8???????? | // 395dd8 | cmp dword ptr [ebp - 0x28], ebx // 895d08 | mov dword ptr [ebp + 8], ebx // 7e51 | jle 0x53 $sequence_3 = { 83c440 6a50 68???????? e8???????? 6a60 68???????? e8???????? } // n = 7, score = 200 // 83c440 | add esp, 0x40 // 6a50 | push 0x50 // 68???????? | // e8???????? | // 6a60 | push 0x60 // 68???????? | // e8???????? | $sequence_4 = { c1f808 99 2bc2 d1f8 40 c1e008 8901 } // n = 7, score = 200 // c1f808 | sar eax, 8 // 99 | cdq // 2bc2 | sub eax, edx // d1f8 | sar eax, 1 // 40 | inc eax // c1e008 | shl eax, 8 // 8901 | mov dword ptr [ecx], eax $sequence_5 = { 8965e4 50 e8???????? 59 8d45e8 50 } // n = 6, score = 200 // 8965e4 | mov dword ptr [ebp - 0x1c], esp // 50 | push eax // e8???????? | // 59 | pop ecx // 8d45e8 | lea eax, [ebp - 0x18] // 50 | push eax $sequence_6 = { 8965f0 50 e8???????? 59 8d45f0 50 } // n = 6, score = 200 // 8965f0 | mov dword ptr [ebp - 0x10], esp // 50 | push eax // e8???????? | // 59 | pop ecx // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax $sequence_7 = { 68eb000000 895dfc e8???????? 8bc8 c645fc02 e8???????? 51 } // n = 7, score = 200 // 68eb000000 | push 0xeb // 895dfc | mov dword ptr [ebp - 4], ebx // e8???????? | // 8bc8 | mov ecx, eax // c645fc02 | mov byte ptr [ebp - 4], 2 // e8???????? | // 51 | push ecx $sequence_8 = { 681d040000 8d4ddc e8???????? 8bc8 c745fc12000000 e8???????? 8945bc } // n = 7, score = 200 // 681d040000 | push 0x41d // 8d4ddc | lea ecx, [ebp - 0x24] // e8???????? | // 8bc8 | mov ecx, eax // c745fc12000000 | mov dword ptr [ebp - 4], 0x12 // e8???????? | // 8945bc | mov dword ptr [ebp - 0x44], eax $sequence_9 = { c1e004 50 ff7604 53 e8???????? 8b4608 8bcf } // n = 7, score = 200 // c1e004 | shl eax, 4 // 50 | push eax // ff7604 | push dword ptr [esi + 4] // 53 | push ebx // e8???????? | // 8b4608 | mov eax, dword ptr [esi + 8] // 8bcf | mov ecx, edi condition: 7 of them and filesize < 753664 }
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