Actor(s): Lazarus Group
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rule win_keymarble_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.keymarble." 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.keymarble" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 83c408 85c0 7407 bb7a452301 } // n = 4, score = 200 // 83c408 | add esp, 8 // 85c0 | test eax, eax // 7407 | je 9 // bb7a452301 | mov ebx, 0x123457a $sequence_1 = { 50 e8???????? 83c404 e8???????? 8d3470 81e6ffffff7f } // n = 6, score = 200 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // e8???????? | // 8d3470 | lea esi, [eax + esi*2] // 81e6ffffff7f | and esi, 0x7fffffff $sequence_2 = { e9???????? 50 6a00 6810040000 ff15???????? } // n = 5, score = 200 // e9???????? | // 50 | push eax // 6a00 | push 0 // 6810040000 | push 0x410 // ff15???????? | $sequence_3 = { e8???????? 83c404 56 6a40 } // n = 4, score = 200 // e8???????? | // 83c404 | add esp, 4 // 56 | push esi // 6a40 | push 0x40 $sequence_4 = { 85db 7407 53 ff15???????? ff15???????? } // n = 5, score = 200 // 85db | test ebx, ebx // 7407 | je 9 // 53 | push ebx // ff15???????? | // ff15???????? | $sequence_5 = { ff15???????? 50 e8???????? 83c404 56 6a40 ff15???????? } // n = 7, score = 200 // ff15???????? | // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 56 | push esi // 6a40 | push 0x40 // ff15???????? | $sequence_6 = { e8???????? 83c404 56 6a40 ff15???????? } // n = 5, score = 200 // e8???????? | // 83c404 | add esp, 4 // 56 | push esi // 6a40 | push 0x40 // ff15???????? | $sequence_7 = { 56 e8???????? 68???????? ff15???????? 8bf0 85f6 } // n = 6, score = 200 // 56 | push esi // e8???????? | // 68???????? | // ff15???????? | // 8bf0 | mov esi, eax // 85f6 | test esi, esi $sequence_8 = { e9???????? 50 6a00 6810040000 } // n = 4, score = 200 // e9???????? | // 50 | push eax // 6a00 | push 0 // 6810040000 | push 0x410 $sequence_9 = { e8???????? 83c408 85c0 7407 bb7a452301 } // n = 5, score = 200 // e8???????? | // 83c408 | add esp, 8 // 85c0 | test eax, eax // 7407 | je 9 // bb7a452301 | mov ebx, 0x123457a condition: 7 of them and filesize < 1146880 }
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