Actor(s): Kimsuky
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rule win_navrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.navrat." 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.navrat" malpedia_rule_date = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8bf0 f7de 1bf6 f7de 56 } // n = 5, score = 300 // 8bf0 | mov esi, eax // f7de | neg esi // 1bf6 | sbb esi, esi // f7de | neg esi // 56 | push esi $sequence_1 = { c745e877735c43 c745ec75727265 c745f06e745665 c745f47273696f 66c745f86e5c } // n = 5, score = 300 // c745e877735c43 | mov dword ptr [ebp - 0x18], 0x435c7377 // c745ec75727265 | mov dword ptr [ebp - 0x14], 0x65727275 // c745f06e745665 | mov dword ptr [ebp - 0x10], 0x6556746e // c745f47273696f | mov dword ptr [ebp - 0xc], 0x6f697372 // 66c745f86e5c | mov word ptr [ebp - 8], 0x5c6e $sequence_2 = { 884702 85f6 7407 8b7608 83461804 } // n = 5, score = 300 // 884702 | mov byte ptr [edi + 2], al // 85f6 | test esi, esi // 7407 | je 9 // 8b7608 | mov esi, dword ptr [esi + 8] // 83461804 | add dword ptr [esi + 0x18], 4 $sequence_3 = { e8???????? 68???????? e8???????? 0fb705???????? } // n = 4, score = 300 // e8???????? | // 68???????? | // e8???????? | // 0fb705???????? | $sequence_4 = { 56 50 57 a3???????? ff15???????? 57 } // n = 6, score = 300 // 56 | push esi // 50 | push eax // 57 | push edi // a3???????? | // ff15???????? | // 57 | push edi $sequence_5 = { c745e4696e646f c745e877735c43 c745ec75727265 c745f06e745665 } // n = 4, score = 300 // c745e4696e646f | mov dword ptr [ebp - 0x1c], 0x6f646e69 // c745e877735c43 | mov dword ptr [ebp - 0x18], 0x435c7377 // c745ec75727265 | mov dword ptr [ebp - 0x14], 0x65727275 // c745f06e745665 | mov dword ptr [ebp - 0x10], 0x6556746e $sequence_6 = { 68???????? 50 8d85f0feffff 8bf1 } // n = 4, score = 300 // 68???????? | // 50 | push eax // 8d85f0feffff | lea eax, [ebp - 0x110] // 8bf1 | mov esi, ecx $sequence_7 = { 7407 8b7608 83461c02 5f } // n = 4, score = 300 // 7407 | je 9 // 8b7608 | mov esi, dword ptr [esi + 8] // 83461c02 | add dword ptr [esi + 0x1c], 2 // 5f | pop edi $sequence_8 = { c745d0536f6674 c745d477617265 c745d85c4d6963 c745dc726f736f c745e066745c57 c745e4696e646f } // n = 6, score = 300 // c745d0536f6674 | mov dword ptr [ebp - 0x30], 0x74666f53 // c745d477617265 | mov dword ptr [ebp - 0x2c], 0x65726177 // c745d85c4d6963 | mov dword ptr [ebp - 0x28], 0x63694d5c // c745dc726f736f | mov dword ptr [ebp - 0x24], 0x6f736f72 // c745e066745c57 | mov dword ptr [ebp - 0x20], 0x575c7466 // c745e4696e646f | mov dword ptr [ebp - 0x1c], 0x6f646e69 $sequence_9 = { 0fbec0 83c004 c3 3c2b 7503 } // n = 5, score = 300 // 0fbec0 | movsx eax, al // 83c004 | add eax, 4 // c3 | ret // 3c2b | cmp al, 0x2b // 7503 | jne 5 condition: 7 of them and filesize < 352256 }
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