Cisco Talos compared this RAT to Cobalt Strike and Sliver. Written in Rust.
rule win_manjusaka_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.manjusaka." 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.manjusaka" 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 = { 7e14 488b8e88000000 488d1440 6683e32e 66895cd1ea 8bc5 488b5c2450 } // n = 7, score = 100 // 7e14 | mov ebp, ecx // 488b8e88000000 | dec eax // 488d1440 | mov dword ptr [esp + 0x20], eax // 6683e32e | dec ecx // 66895cd1ea | mov edi, ecx // 8bc5 | mov dl, 0x7f // 488b5c2450 | dec esp $sequence_1 = { c3 488d05b4121b00 4889442420 488d0d70121b00 4c8d0db9051900 4c8d442430 ba37000000 } // n = 7, score = 100 // c3 | xor edx, edx // 488d05b4121b00 | dec eax // 4889442420 | cmp dword ptr [edi + 0x38], 0 // 488d0d70121b00 | je 0x671 // 4c8d0db9051900 | je 0x673 // 4c8d442430 | dec esp // ba37000000 | mov eax, dword ptr [edi + 0x20] $sequence_2 = { 49894608 e9???????? 31c9 4885c9 488d2d3cf21300 480f45e9 480f44f1 } // n = 7, score = 100 // 49894608 | cmp dword ptr [edi + 0x48], ebp // e9???????? | // 31c9 | jne 0x3b4 // 4885c9 | dec eax // 488d2d3cf21300 | mov edi, dword ptr [edi + 0x10] // 480f45e9 | dec eax // 480f44f1 | test edi, edi $sequence_3 = { ffc3 498d4e50 e8???????? 4839d0 7426 4889c1 4989d7 } // n = 7, score = 100 // ffc3 | mov byte ptr [eax + 0xb], cl // 498d4e50 | test cl, cl // e8???????? | // 4839d0 | jne 0x871 // 7426 | dec eax // 4889c1 | mov eax, dword ptr [ebp - 0x20] // 4989d7 | mov byte ptr [eax + 0xc], 1 $sequence_4 = { 7559 488b5710 4885d2 7450 e8???????? 85c0 7547 } // n = 7, score = 100 // 7559 | dec esp // 488b5710 | mov edx, dword ptr [esp + 0x70] // 4885d2 | dec esp // 7450 | mov dword ptr [ebx + 0x50], edx // e8???????? | // 85c0 | dec esp // 7547 | mov esi, dword ptr [esp + 0xd0] $sequence_5 = { ffc8 8b542470 488bcd 89442444 e8???????? 418b442438 448bc6 } // n = 7, score = 100 // ffc8 | je 0x190 // 8b542470 | dec esp // 488bcd | mov esi, dword ptr [edi + 0x20] // 89442444 | dec ebp // e8???????? | // 418b442438 | test esi, esi // 448bc6 | mov eax, dword ptr [ebx] $sequence_6 = { c1e012 c1e706 4183e63f 4109fe 4109c6 4181fe00001100 408a6c2433 } // n = 7, score = 100 // c1e012 | dec ebp // c1e706 | test edi, edi // 4183e63f | je 0x9d8 // 4109fe | je 0x9cf // 4109c6 | dec eax // 4181fe00001100 | mov ecx, dword ptr [edi] // 408a6c2433 | dec ecx $sequence_7 = { e8???????? 450fbf4e46 41bd02000000 8b45c4 4503cd 488bce 89442420 } // n = 7, score = 100 // e8???????? | // 450fbf4e46 | dec eax // 41bd02000000 | sar edi, 2 // 8b45c4 | jne 0x25a // 4503cd | inc ecx // 488bce | test byte ptr [ebp], 0xdf // 89442420 | je 0x268 $sequence_8 = { 498d142f 410fb6c1 4c8d052ae80900 41c1e908 b90d000000 89442420 e8???????? } // n = 7, score = 100 // 498d142f | inc ebp // 410fb6c1 | xor eax, eax // 4c8d052ae80900 | inc ecx // 41c1e908 | lea edx, [eax + 0x48] // b90d000000 | jmp 0xdc9 // 89442420 | dec eax // e8???????? | $sequence_9 = { e9???????? 488d0d2aaf0f00 4c8d054baf0f00 ba21000000 e8???????? e9???????? c685d705000001 } // n = 7, score = 100 // e9???????? | // 488d0d2aaf0f00 | inc ecx // 4c8d054baf0f00 | mov edi, eax // ba21000000 | dec ecx // e8???????? | // e9???????? | // c685d705000001 | shl edi, 0x20 condition: 7 of them and filesize < 4772864 }
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