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rule win_nymaim2_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "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 = { e8???????? 8d4de4 c645fc45 e8???????? 8d4de0 c645fc05 e8???????? } // n = 7, score = 200 // e8???????? | // 8d4de4 | lea ecx, [ebp - 0x1c] // c645fc45 | mov byte ptr [ebp - 4], 0x45 // e8???????? | // 8d4de0 | lea ecx, [ebp - 0x20] // c645fc05 | mov byte ptr [ebp - 4], 5 // e8???????? | $sequence_1 = { e8???????? 83ec20 56 33f6 3935???????? 7546 68da010000 } // n = 7, score = 200 // e8???????? | // 83ec20 | sub esp, 0x20 // 56 | push esi // 33f6 | xor esi, esi // 3935???????? | // 7546 | jne 0x48 // 68da010000 | push 0x1da $sequence_2 = { 50 8d45f0 50 e8???????? e8???????? 834dfcff 8d4df0 } // n = 7, score = 200 // 50 | push eax // 8d45f0 | lea eax, [ebp - 0x10] // 50 | push eax // e8???????? | // e8???????? | // 834dfcff | or dword ptr [ebp - 4], 0xffffffff // 8d4df0 | lea ecx, [ebp - 0x10] $sequence_3 = { e8???????? 8b7510 59 59 8b16 50 8bce } // n = 7, score = 200 // e8???????? | // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 59 | pop ecx // 59 | pop ecx // 8b16 | mov edx, dword ptr [esi] // 50 | push eax // 8bce | mov ecx, esi $sequence_4 = { c645fc46 e8???????? 8d4de4 c645fc1b e8???????? 8d4ddc e8???????? } // n = 7, score = 200 // c645fc46 | mov byte ptr [ebp - 4], 0x46 // e8???????? | // 8d4de4 | lea ecx, [ebp - 0x1c] // c645fc1b | mov byte ptr [ebp - 4], 0x1b // e8???????? | // 8d4ddc | lea ecx, [ebp - 0x24] // e8???????? | $sequence_5 = { 8d45d4 8bce 50 c645fc01 e8???????? 8d45c0 8d4dd4 } // n = 7, score = 200 // 8d45d4 | lea eax, [ebp - 0x2c] // 8bce | mov ecx, esi // 50 | push eax // c645fc01 | mov byte ptr [ebp - 4], 1 // e8???????? | // 8d45c0 | lea eax, [ebp - 0x40] // 8d4dd4 | lea ecx, [ebp - 0x2c] $sequence_6 = { 56 8bcf c645fc09 ff5008 51 8d4604 8bcc } // n = 7, score = 200 // 56 | push esi // 8bcf | mov ecx, edi // c645fc09 | mov byte ptr [ebp - 4], 9 // ff5008 | call dword ptr [eax + 8] // 51 | push ecx // 8d4604 | lea eax, [esi + 4] // 8bcc | mov ecx, esp $sequence_7 = { 8d4df0 e9???????? 8d4dc0 e9???????? 8d4dec e9???????? 8b45e8 } // n = 7, score = 200 // 8d4df0 | lea ecx, [ebp - 0x10] // e9???????? | // 8d4dc0 | lea ecx, [ebp - 0x40] // e9???????? | // 8d4dec | lea ecx, [ebp - 0x14] // e9???????? | // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_8 = { 8d86640c0000 8bd9 03c9 c1eb1f 0bd9 c746040e000000 33da } // n = 7, score = 200 // 8d86640c0000 | lea eax, [esi + 0xc64] // 8bd9 | mov ebx, ecx // 03c9 | add ecx, ecx // c1eb1f | shr ebx, 0x1f // 0bd9 | or ebx, ecx // c746040e000000 | mov dword ptr [esi + 4], 0xe // 33da | xor ebx, edx $sequence_9 = { 8bc8 c645fc03 e8???????? 51 8bcc 8965ec 50 } // n = 7, score = 200 // 8bc8 | mov ecx, eax // c645fc03 | mov byte ptr [ebp - 4], 3 // e8???????? | // 51 | push ecx // 8bcc | mov ecx, esp // 8965ec | mov dword ptr [ebp - 0x14], esp // 50 | push eax condition: 7 of them and filesize < 753664 }
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