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rule win_nymaim2_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8b7de8 ff4514 6a04 890a 59 014dfc } // n = 6, score = 200 // 8b7de8 | mov edi, dword ptr [ebp - 0x18] // ff4514 | inc dword ptr [ebp + 0x14] // 6a04 | push 4 // 890a | mov dword ptr [edx], ecx // 59 | pop ecx // 014dfc | add dword ptr [ebp - 4], ecx $sequence_1 = { c645fc0c e8???????? b8???????? c3 6a51 8d4ddc e8???????? } // n = 7, score = 200 // c645fc0c | mov byte ptr [ebp - 4], 0xc // e8???????? | // b8???????? | // c3 | ret // 6a51 | push 0x51 // 8d4ddc | lea ecx, [ebp - 0x24] // e8???????? | $sequence_2 = { c9 c20800 56 8bf1 8b4604 c706???????? 85c0 } // n = 7, score = 200 // c9 | leave // c20800 | ret 8 // 56 | push esi // 8bf1 | mov esi, ecx // 8b4604 | mov eax, dword ptr [esi + 4] // c706???????? | // 85c0 | test eax, eax $sequence_3 = { 80fa30 7c05 80fa39 7ee8 5e c3 } // n = 6, score = 200 // 80fa30 | cmp dl, 0x30 // 7c05 | jl 7 // 80fa39 | cmp dl, 0x39 // 7ee8 | jle 0xffffffea // 5e | pop esi // c3 | ret $sequence_4 = { ff7650 8945fc ff750c 50 e8???????? 8b86a0000000 8b7df8 } // n = 7, score = 200 // ff7650 | push dword ptr [esi + 0x50] // 8945fc | mov dword ptr [ebp - 4], eax // ff750c | push dword ptr [ebp + 0xc] // 50 | push eax // e8???????? | // 8b86a0000000 | mov eax, dword ptr [esi + 0xa0] // 8b7df8 | mov edi, dword ptr [ebp - 8] $sequence_5 = { 53 56 8bf1 57 68fd030000 8d4dc0 e8???????? } // n = 7, score = 200 // 53 | push ebx // 56 | push esi // 8bf1 | mov esi, ecx // 57 | push edi // 68fd030000 | push 0x3fd // 8d4dc0 | lea ecx, [ebp - 0x40] // e8???????? | $sequence_6 = { 897df0 397df0 8d4d08 0f95c3 834dfcff e8???????? 8b4df4 } // n = 7, score = 200 // 897df0 | mov dword ptr [ebp - 0x10], edi // 397df0 | cmp dword ptr [ebp - 0x10], edi // 8d4d08 | lea ecx, [ebp + 8] // 0f95c3 | setne bl // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] $sequence_7 = { a5 a5 50 a5 e8???????? 8d75e0 8d7dc0 } // n = 7, score = 200 // a5 | movsd dword ptr es:[edi], dword ptr [esi] // a5 | movsd dword ptr es:[edi], dword ptr [esi] // 50 | push eax // a5 | movsd dword ptr es:[edi], dword ptr [esi] // e8???????? | // 8d75e0 | lea esi, [ebp - 0x20] // 8d7dc0 | lea edi, [ebp - 0x40] $sequence_8 = { ff15???????? 6a19 99 59 f7f9 8bc2 83c061 } // n = 7, score = 200 // ff15???????? | // 6a19 | push 0x19 // 99 | cdq // 59 | pop ecx // f7f9 | idiv ecx // 8bc2 | mov eax, edx // 83c061 | add eax, 0x61 $sequence_9 = { e8???????? 85c0 59 7535 33ff 3975e8 7e2e } // n = 7, score = 200 // e8???????? | // 85c0 | test eax, eax // 59 | pop ecx // 7535 | jne 0x37 // 33ff | xor edi, edi // 3975e8 | cmp dword ptr [ebp - 0x18], esi // 7e2e | jle 0x30 condition: 7 of them and filesize < 753664 }
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