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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { ebb8 488d05b77a1000 4889442450 48c744245801000000 48c744246000000000 488d05f9b01100 4889442470 } // n = 7, score = 100 // ebb8 | lea edx, [eax + 2] // 488d05b77a1000 | dec ebp // 4889442450 | mov eax, edi // 48c744245801000000 | dec eax // 48c744246000000000 | mov ecx, ebx // 488d05f9b01100 | mov edx, 3 // 4889442470 | dec eax $sequence_1 = { 4c89bc2480040000 4c8939 4c897108 48895910 48c7411800800000 0f117018 48897930 } // n = 7, score = 100 // 4c89bc2480040000 | lea ecx, [esp + 0x28] // 4c8939 | dec eax // 4c897108 | mov dword ptr [ecx], eax // 48895910 | dec eax // 48c7411800800000 | lea edx, [esp + 0x58] // 0f117018 | dec eax // 48897930 | mov dword ptr [edx], eax $sequence_2 = { 791d 418b4128 41034124 4863c8 488bc2 48f7d8 48c1e00a } // n = 7, score = 100 // 791d | dec ebp // 418b4128 | arpl word ptr [edi + 0x40], cx // 41034124 | inc ecx // 4863c8 | mov dword ptr [edi + 0x38], eax // 488bc2 | mov al, byte ptr [edx + 0x42] // 48f7d8 | neg al // 48c1e00a | sbb cl, cl $sequence_3 = { 89411c 488b45d7 2b4527 05feffff07 89710c 894120 8b45db } // n = 7, score = 100 // 89411c | movaps xmmword ptr [ebp + 0x810], xmm6 // 488b45d7 | inc ecx // 2b4527 | mov eax, 0x3c0 // 05feffff07 | dec eax // 89710c | lea ecx, [ebp + 0x820] // 894120 | dec eax // 8b45db | lea edx, [ebp + 0x3c0] $sequence_4 = { 4989f8 e8???????? 48ffcb 75ed 0f57f6 488d9c2410010000 0f297320 } // n = 7, score = 100 // 4989f8 | mov ecx, dword ptr [edi + esi + 0x18] // e8???????? | // 48ffcb | dec eax // 75ed | mov edx, edi // 0f57f6 | dec ecx // 488d9c2410010000 | mov ecx, esp // 0f297320 | inc ebp $sequence_5 = { 898c24f8000000 48896c2448 3b08 0f8c21fdffff 4c8bbc24f0000000 4d85f6 7424 } // n = 7, score = 100 // 898c24f8000000 | mov dword ptr [eax], ebx // 48896c2448 | mov byte ptr [eax + 8], 1 // 3b08 | dec eax // 0f8c21fdffff | test edi, edi // 4c8bbc24f0000000 | je 0x311 // 4d85f6 | mov word ptr [ebx + 0xa6], ax // 7424 | dec esp $sequence_6 = { 814d4002020000 4533c0 48894500 498bcd 83c8ff 66894544 b8c8000000 } // n = 7, score = 100 // 814d4002020000 | je 0xe5 // 4533c0 | dec ebp // 48894500 | mov ebp, eax // 498bcd | mov edx, 6 // 83c8ff | dec eax // 66894544 | mov dword ptr [esp + 0x38], eax // b8c8000000 | dec ecx $sequence_7 = { 89573c 48894740 895750 488b442e60 48894758 488b442e28 488b4860 } // n = 7, score = 100 // 89573c | test bx, bx // 48894740 | jne 0x849 // 895750 | dec esp // 488b442e60 | cmp ecx, eax // 48894758 | je 0x8ef // 488b442e28 | test dx, dx // 488b4860 | je 0xa0d $sequence_8 = { f7d8 894c2420 448bc5 498bcd 1bd2 4533c9 83e2fc } // n = 7, score = 100 // f7d8 | je 0x2024 // 894c2420 | mov edx, 0x1a0 // 448bc5 | mov dword ptr [esi + 0x18], edi // 498bcd | mov dword ptr [esi + 0x1c], eax // 1bd2 | mov dword ptr [esi + 0x20], eax // 4533c9 | dec eax // 83e2fc | mov edi, eax $sequence_9 = { e8???????? 4889d9 e8???????? 488d4f70 e8???????? 488d8fe0000000 e8???????? } // n = 7, score = 100 // e8???????? | // 4889d9 | mov dword ptr [ebx + 0x10], eax // e8???????? | // 488d4f70 | mov dword ptr [ebx + 4], eax // e8???????? | // 488d8fe0000000 | or eax, 0xffffffff // e8???????? | condition: 7 of them and filesize < 4772864 }
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