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 = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { f30f7f4f40 f30f7f6f50 f3440f7f4f60 f3440f7f7f70 b980000000 4881eb80000000 488db680000000 } // n = 7, score = 100 // f30f7f4f40 | lea ecx, [edi + 0x398] // f30f7f6f50 | dec eax // f3440f7f4f60 | inc eax // f3440f7f7f70 | xor edx, edx // b980000000 | dec esp // 4881eb80000000 | lea eax, [eax + eax*2] // 488db680000000 | dec ecx $sequence_1 = { e9???????? 4b8b442c28 488b4c2428 48894110 430f10442c18 0f1101 488b4c2420 } // n = 7, score = 100 // e9???????? | // 4b8b442c28 | add eax, 2 // 488b4c2428 | dec ebp // 48894110 | lea ebx, [edx + 1] // 430f10442c18 | mov bl, byte ptr [ecx + eax - 1] // 0f1101 | add bl, 0xd0 // 488b4c2420 | cmp bl, 0xa $sequence_2 = { 89461c 48c70601000000 488d4c2470 e8???????? 90 4881c4f8040000 5b } // n = 7, score = 100 // 89461c | add esp, 0x70 // 48c70601000000 | inc ecx // 488d4c2470 | pop edi // e8???????? | // 90 | inc ecx // 4881c4f8040000 | pop esi // 5b | inc ecx $sequence_3 = { e8???????? 41bb01000000 85c0 750f 458d6301 e9???????? 4183fd03 } // n = 7, score = 100 // e8???????? | // 41bb01000000 | dec esp // 85c0 | lea eax, [0x9c259] // 750f | mov dword ptr [ebp - 0x45], edi // 458d6301 | inc esp // e9???????? | // 4183fd03 | lea esi, [esi + 3] $sequence_4 = { 89442470 448d4238 e8???????? 488d45f0 4c897d78 48898588000000 418b4738 } // n = 7, score = 100 // 89442470 | mov eax, esi // 448d4238 | neg eax // e8???????? | // 488d45f0 | cmovs eax, esi // 4c897d78 | cmp eax, ecx // 48898588000000 | jns 0x15d // 418b4738 | inc esp $sequence_5 = { 660fefcb 0f57d2 f30f10d1 660f3a4415????????10 660f3a0ed0fc 48b8410671db01000000 66480f6ec0 } // n = 7, score = 100 // 660fefcb | dec eax // 0f57d2 | lea ebp, [edx + 0x80] // f30f10d1 | movdqa xmmword ptr [esp + 0x30], xmm7 // 660f3a4415????????10 | // 660f3a0ed0fc | movaps xmmword ptr [esp + 0x40], xmm6 // 48b8410671db01000000 | dec eax // 66480f6ec0 | lea ecx, [ebp + 0xd50] $sequence_6 = { 742c 48895820 4c8d0dd3e4e6ff 393b 0f84ac0d0000 488b4308 488b56a8 } // n = 7, score = 100 // 742c | dec eax // 48895820 | lea edx, [eax + ecx*8] // 4c8d0dd3e4e6ff | dec eax // 393b | add esp, 0x28 // 0f84ac0d0000 | ret // 488b4308 | jb 0xea // 488b56a8 | dec eax $sequence_7 = { e8???????? eb21 498bcc e8???????? eb05 bb07000000 4533e4 } // n = 7, score = 100 // e8???????? | // eb21 | mov ebx, eax // 498bcc | dec eax // e8???????? | // eb05 | mov dword ptr [esp + 0x48], esi // bb07000000 | dec eax // 4533e4 | add ebx, 0x4a000 $sequence_8 = { f7400400010000 750c ffc9 4983e820 4883ea01 79e8 85c9 } // n = 7, score = 100 // f7400400010000 | jne 0x63a // 750c | movzx ecx, word ptr [eax] // ffc9 | cmp ecx, 0x2e2e // 4983e820 | dec eax // 4883ea01 | test eax, eax // 79e8 | je 0xeb6 // 85c9 | dec eax $sequence_9 = { f7404000020000 7513 418d7001 c6430144 83c8ff 89742434 66894330 } // n = 7, score = 100 // f7404000020000 | lea eax, [0xfffef3a7] // 7513 | dec eax // 418d7001 | mov dword ptr [edi], eax // c6430144 | dec eax // 83c8ff | lea eax, [0xfffef39d] // 89742434 | dec eax // 66894330 | test eax, eax condition: 7 of them and filesize < 4772864 }
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