Actor(s): Molerats
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rule win_molerat_loader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.molerat_loader." 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.molerat_loader" 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 = { 6a00 ffd7 8b8574feffff 83c0f0 8d480c 83caff f00fc111 } // n = 7, score = 100 // 6a00 | push 0 // ffd7 | call edi // 8b8574feffff | mov eax, dword ptr [ebp - 0x18c] // 83c0f0 | add eax, -0x10 // 8d480c | lea ecx, [eax + 0xc] // 83caff | or edx, 0xffffffff // f00fc111 | lock xadd dword ptr [ecx], edx $sequence_1 = { 8d5de0 e8???????? 50 8d4db8 c645fc08 e8???????? c645fc07 } // n = 7, score = 100 // 8d5de0 | lea ebx, [ebp - 0x20] // e8???????? | // 50 | push eax // 8d4db8 | lea ecx, [ebp - 0x48] // c645fc08 | mov byte ptr [ebp - 4], 8 // e8???????? | // c645fc07 | mov byte ptr [ebp - 4], 7 $sequence_2 = { 64a300000000 8965f0 8b7d08 57 8d45e0 33f6 50 } // n = 7, score = 100 // 64a300000000 | mov dword ptr fs:[0], eax // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b7d08 | mov edi, dword ptr [ebp + 8] // 57 | push edi // 8d45e0 | lea eax, [ebp - 0x20] // 33f6 | xor esi, esi // 50 | push eax $sequence_3 = { c705????????aa994200 a3???????? c705????????e5a24200 c705????????c6994200 c705????????28994200 c705????????b5984200 c3 } // n = 7, score = 100 // c705????????aa994200 | // a3???????? | // c705????????e5a24200 | // c705????????c6994200 | // c705????????28994200 | // c705????????b5984200 | // c3 | ret $sequence_4 = { 50 e8???????? 83c404 c684240c05000000 8d47f0 8d480c } // n = 6, score = 100 // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // c684240c05000000 | mov byte ptr [esp + 0x50c], 0 // 8d47f0 | lea eax, [edi - 0x10] // 8d480c | lea ecx, [eax + 0xc] $sequence_5 = { 66894d90 8b4dd4 894d98 ba03000000 668955a0 ba14060000 } // n = 6, score = 100 // 66894d90 | mov word ptr [ebp - 0x70], cx // 8b4dd4 | mov ecx, dword ptr [ebp - 0x2c] // 894d98 | mov dword ptr [ebp - 0x68], ecx // ba03000000 | mov edx, 3 // 668955a0 | mov word ptr [ebp - 0x60], dx // ba14060000 | mov edx, 0x614 $sequence_6 = { c645fc04 8b45e4 83c0f0 83cfff 8d500c 8bcf } // n = 6, score = 100 // c645fc04 | mov byte ptr [ebp - 4], 4 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] // 83c0f0 | add eax, -0x10 // 83cfff | or edi, 0xffffffff // 8d500c | lea edx, [eax + 0xc] // 8bcf | mov ecx, edi $sequence_7 = { 8d4d94 c645fc2b e8???????? 68???????? 8d4d98 c645fc2c e8???????? } // n = 7, score = 100 // 8d4d94 | lea ecx, [ebp - 0x6c] // c645fc2b | mov byte ptr [ebp - 4], 0x2b // e8???????? | // 68???????? | // 8d4d98 | lea ecx, [ebp - 0x68] // c645fc2c | mov byte ptr [ebp - 4], 0x2c // e8???????? | $sequence_8 = { 890e 8930 8bc6 5e c3 8bff } // n = 6, score = 100 // 890e | mov dword ptr [esi], ecx // 8930 | mov dword ptr [eax], esi // 8bc6 | mov eax, esi // 5e | pop esi // c3 | ret // 8bff | mov edi, edi $sequence_9 = { 57 50 8d45f4 64a300000000 8965f0 8b8510020000 8d8d38ffffff } // n = 7, score = 100 // 57 | push edi // 50 | push eax // 8d45f4 | lea eax, [ebp - 0xc] // 64a300000000 | mov dword ptr fs:[0], eax // 8965f0 | mov dword ptr [ebp - 0x10], esp // 8b8510020000 | mov eax, dword ptr [ebp + 0x210] // 8d8d38ffffff | lea ecx, [ebp - 0xc8] condition: 7 of them and filesize < 688128 }
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