Actor(s): Lazarus Group
There is no description at this point.
rule win_torisma_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.torisma." 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.torisma" 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 = { 488b542450 8b0482 33c1 8b4c2430 488b542450 89048a ebb5 } // n = 7, score = 100 // 488b542450 | dec eax // 8b0482 | mov eax, dword ptr [esp + 0x50] // 33c1 | mov eax, dword ptr [eax + 0x4c] // 8b4c2430 | shr eax, 0x14 // 488b542450 | and eax, 1 // 89048a | dec eax // ebb5 | mov ecx, dword ptr [esp + 0x50] $sequence_1 = { c1e018 8b4c2430 33c8 8bc1 89442430 } // n = 5, score = 100 // c1e018 | xor eax, ecx // 8b4c2430 | dec eax // 33c8 | mov ecx, dword ptr [esp + 0x50] // 8bc1 | mov ecx, dword ptr [ecx + 0x68] // 89442430 | shr ecx, 0x15 $sequence_2 = { 0bd1 8bca 898c24e8000000 488b542478 8b520c 488b7c2470 } // n = 6, score = 100 // 0bd1 | dec esp // 8bca | mov dword ptr [esp + 0x18], eax // 898c24e8000000 | dec eax // 488b542478 | mov dword ptr [esp + 0x10], edx // 8b520c | dec eax // 488b7c2470 | mov dword ptr [esp + 8], ecx $sequence_3 = { 8b942400010000 0bd1 8bca 898c2404010000 488b542478 } // n = 5, score = 100 // 8b942400010000 | dec eax // 0bd1 | mov edi, dword ptr [eax + 0x18] // 8bca | xor eax, eax // 898c2404010000 | mov ecx, 0xc // 488b542478 | dec eax $sequence_4 = { 4c8d05a6340100 ba00020000 488b4c2448 e8???????? eb63 } // n = 5, score = 100 // 4c8d05a6340100 | dec eax // ba00020000 | sub esp, 0xa8 // 488b4c2448 | dec eax // e8???????? | // eb63 | mov dword ptr [esp + 0x70], 0xfffffffe $sequence_5 = { 7411 488b4c2448 e8???????? 4889442478 eb09 48c744247800000000 488b442478 } // n = 7, score = 100 // 7411 | dec eax // 488b4c2448 | mov eax, dword ptr [esp + 0x50] // e8???????? | // 4889442478 | dec eax // eb09 | cmp dword ptr [eax], -1 // 48c744247800000000 | je 0x1c83 // 488b442478 | inc ecx $sequence_6 = { 488b17 488b4c2468 e8???????? 488b842420010000 488b00 488b8c2420010000 488b09 } // n = 7, score = 100 // 488b17 | je 0x4d4 // 488b4c2468 | dec eax // e8???????? | // 488b842420010000 | mov eax, dword ptr [esp + 0x48] // 488b00 | dec eax // 488b8c2420010000 | mov dword ptr [esp + 0xe0], eax // 488b09 | dec eax $sequence_7 = { 8bc1 8bc0 488b4c2438 4803c8 488bc1 } // n = 5, score = 100 // 8bc1 | je 0x200f // 8bc0 | mov edx, 1 // 488b4c2438 | dec eax // 4803c8 | mov eax, dword ptr [esp + 0x70] // 488bc1 | dec eax $sequence_8 = { 33c1 488b4c2450 8b4968 c1e90f 83e101 33c1 488b4c2450 } // n = 7, score = 100 // 33c1 | mov edx, dword ptr [ecx] // 488b4c2450 | dec eax // 8b4968 | mov eax, dword ptr [esp + 0x120] // c1e90f | dec eax // 83e101 | mov eax, dword ptr [eax] // 33c1 | dec eax // 488b4c2450 | mov ecx, dword ptr [esp + 0x120] $sequence_9 = { 488b842480000000 488b00 c7404000000000 488b842480000000 488b00 c7403c00000000 } // n = 6, score = 100 // 488b842480000000 | mov ecx, dword ptr [esp + 0x30] // 488b00 | shr ecx, 7 // c7404000000000 | and ecx, 1 // 488b842480000000 | xor eax, ecx // 488b00 | dec eax // c7403c00000000 | mov ecx, dword ptr [esp + 0x50] condition: 7 of them and filesize < 322560 }
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