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rule win_kimjongrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.kimjongrat." 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.kimjongrat" 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 = { e9???????? c6840db8eeffff29 e9???????? c6840db8eeffff3b e9???????? c6840db8eeffff2b e9???????? } // n = 7, score = 100 // e9???????? | // c6840db8eeffff29 | mov byte ptr [ebp + ecx - 0x1148], 0x29 // e9???????? | // c6840db8eeffff3b | mov byte ptr [ebp + ecx - 0x1148], 0x3b // e9???????? | // c6840db8eeffff2b | mov byte ptr [ebp + ecx - 0x1148], 0x2b // e9???????? | $sequence_1 = { c745dc00000000 8d4900 8b3e 85ff 783b 50 57 } // n = 7, score = 100 // c745dc00000000 | mov dword ptr [ebp - 0x24], 0 // 8d4900 | lea ecx, [ecx] // 8b3e | mov edi, dword ptr [esi] // 85ff | test edi, edi // 783b | js 0x3d // 50 | push eax // 57 | push edi $sequence_2 = { c78566feffff00000000 66c7856afeffff0000 66898580fcffff 0f57c0 0fb705???????? 660fd68582fcffff 660fd6858afcffff } // n = 7, score = 100 // c78566feffff00000000 | mov dword ptr [ebp - 0x19a], 0 // 66c7856afeffff0000 | mov word ptr [ebp - 0x196], 0 // 66898580fcffff | mov word ptr [ebp - 0x380], ax // 0f57c0 | xorps xmm0, xmm0 // 0fb705???????? | // 660fd68582fcffff | movq qword ptr [ebp - 0x37e], xmm0 // 660fd6858afcffff | movq qword ptr [ebp - 0x376], xmm0 $sequence_3 = { e8???????? 83c408 8945e0 85c0 0f84ae010000 803800 7513 } // n = 7, score = 100 // e8???????? | // 83c408 | add esp, 8 // 8945e0 | mov dword ptr [ebp - 0x20], eax // 85c0 | test eax, eax // 0f84ae010000 | je 0x1b4 // 803800 | cmp byte ptr [eax], 0 // 7513 | jne 0x15 $sequence_4 = { c6840de4f9ffff3d e9???????? c6840de4f9ffff5f e9???????? c6840de4f9ffff3a e9???????? c6840de4f9ffff23 } // n = 7, score = 100 // c6840de4f9ffff3d | mov byte ptr [ebp + ecx - 0x61c], 0x3d // e9???????? | // c6840de4f9ffff5f | mov byte ptr [ebp + ecx - 0x61c], 0x5f // e9???????? | // c6840de4f9ffff3a | mov byte ptr [ebp + ecx - 0x61c], 0x3a // e9???????? | // c6840de4f9ffff23 | mov byte ptr [ebp + ecx - 0x61c], 0x23 $sequence_5 = { ff7304 ff37 e8???????? 83c408 894304 e9???????? 8d4304 } // n = 7, score = 100 // ff7304 | push dword ptr [ebx + 4] // ff37 | push dword ptr [edi] // e8???????? | // 83c408 | add esp, 8 // 894304 | mov dword ptr [ebx + 4], eax // e9???????? | // 8d4304 | lea eax, [ebx + 4] $sequence_6 = { e9???????? c6840dccf3ffff2d e9???????? c6840dccf3ffff7d e9???????? c6840dccf3ffff29 e9???????? } // n = 7, score = 100 // e9???????? | // c6840dccf3ffff2d | mov byte ptr [ebp + ecx - 0xc34], 0x2d // e9???????? | // c6840dccf3ffff7d | mov byte ptr [ebp + ecx - 0xc34], 0x7d // e9???????? | // c6840dccf3ffff29 | mov byte ptr [ebp + ecx - 0xc34], 0x29 // e9???????? | $sequence_7 = { ff75dc 56 e8???????? 83c408 5f 5e 5b } // n = 7, score = 100 // ff75dc | push dword ptr [ebp - 0x24] // 56 | push esi // e8???????? | // 83c408 | add esp, 8 // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_8 = { e9???????? c6840df0fcffff63 e9???????? c6840df0fcffff6c e9???????? c6840df0fcffff64 e9???????? } // n = 7, score = 100 // e9???????? | // c6840df0fcffff63 | mov byte ptr [ebp + ecx - 0x310], 0x63 // e9???????? | // c6840df0fcffff6c | mov byte ptr [ebp + ecx - 0x310], 0x6c // e9???????? | // c6840df0fcffff64 | mov byte ptr [ebp + ecx - 0x310], 0x64 // e9???????? | $sequence_9 = { ff7508 e8???????? 83c40c 8945fc 57 8b7df0 57 } // n = 7, score = 100 // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 83c40c | add esp, 0xc // 8945fc | mov dword ptr [ebp - 4], eax // 57 | push edi // 8b7df0 | mov edi, dword ptr [ebp - 0x10] // 57 | push edi condition: 7 of them and filesize < 1572864 }
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