Actor(s): Kimsuky
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rule win_navrat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "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 = { c745dc726f736f c745e066745c57 c745e4696e646f c745e877735c43 c745ec75727265 c745f06e745665 c745f47273696f } // n = 7, score = 300 // c745dc726f736f | mov dword ptr [ebp - 0x24], 0x6f736f72 // c745e066745c57 | mov dword ptr [ebp - 0x20], 0x575c7466 // 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 // c745f47273696f | mov dword ptr [ebp - 0xc], 0x6f697372 $sequence_1 = { 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_2 = { c745e877735c43 c745ec75727265 c745f06e745665 c745f47273696f } // n = 4, 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 $sequence_3 = { 7707 0fbec0 83e847 c3 8d48d0 80f909 7707 } // n = 7, score = 300 // 7707 | ja 9 // 0fbec0 | movsx eax, al // 83e847 | sub eax, 0x47 // c3 | ret // 8d48d0 | lea ecx, [eax - 0x30] // 80f909 | cmp cl, 9 // 7707 | ja 9 $sequence_4 = { 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_5 = { 85f6 7407 8b7608 83461804 } // n = 4, score = 300 // 85f6 | test esi, esi // 7407 | je 9 // 8b7608 | mov esi, dword ptr [esi + 8] // 83461804 | add dword ptr [esi + 0x18], 4 $sequence_6 = { c745e066745c57 c745e4696e646f c745e877735c43 c745ec75727265 c745f06e745665 c745f47273696f } // n = 6, score = 300 // c745e066745c57 | mov dword ptr [ebp - 0x20], 0x575c7466 // 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 // c745f47273696f | mov dword ptr [ebp - 0xc], 0x6f697372 $sequence_7 = { 3c2f 0f95c0 fec8 2440 fec8 c3 } // n = 6, score = 300 // 3c2f | cmp al, 0x2f // 0f95c0 | setne al // fec8 | dec al // 2440 | and al, 0x40 // fec8 | dec al // c3 | ret $sequence_8 = { ff15???????? 8bf0 f7de 1bf6 f7de 56 } // n = 6, score = 300 // ff15???????? | // 8bf0 | mov esi, eax // f7de | neg esi // 1bf6 | sbb esi, esi // f7de | neg esi // 56 | push esi $sequence_9 = { e8???????? 68???????? e8???????? 0fb705???????? } // n = 4, score = 300 // e8???????? | // 68???????? | // e8???????? | // 0fb705???????? | condition: 7 of them and filesize < 352256 }
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