Actor(s): MuddyWater
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rule win_moriagent_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.moriagent" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 = { b802000000 eb05 b801000000 33ff } // n = 4, score = 200 // b802000000 | mov eax, 2 // eb05 | jmp 7 // b801000000 | mov eax, 1 // 33ff | xor edi, edi $sequence_1 = { 4c89742458 48c74424600f000000 4488742448 458d460d 488d150bc90500 } // n = 5, score = 100 // 4c89742458 | lea edx, [ecx - 0x10] // 48c74424600f000000 | mov dword ptr [ecx + ebx - 0xac], edx // 4488742448 | dec eax // 458d460d | mov dword ptr [edi + 0x18], ebp // 488d150bc90500 | movups xmm0, xmmword ptr [ebx] $sequence_2 = { 8bcf e8???????? 8b5ddc 83c404 897b04 8bc3 } // n = 6, score = 100 // 8bcf | push esi // e8???????? | // 8b5ddc | inc ecx // 83c404 | push edi // 897b04 | dec eax // 8bc3 | lea ebp, [esp - 0x80] $sequence_3 = { 3bd0 772a 837de010 894f10 8bcf 7202 8b0f } // n = 7, score = 100 // 3bd0 | dec eax // 772a | mov dword ptr [ebp - 0x60], 0xfffffffe // 837de010 | dec eax // 894f10 | xor eax, esp // 8bcf | dec eax // 7202 | mov dword ptr [ebp + 0xf0], eax // 8b0f | xor edi, edi $sequence_4 = { e8???????? 83c408 8b8508ffffff 83c018 898508ffffff } // n = 5, score = 100 // e8???????? | // 83c408 | dec eax // 8b8508ffffff | mov eax, esp // 83c018 | push ebp // 898508ffffff | inc ecx $sequence_5 = { 488bc4 55 4156 4157 488d6c2480 4881ec80010000 48c745a0feffffff } // n = 7, score = 100 // 488bc4 | movups xmmword ptr [edi], xmm0 // 55 | movups xmm1, xmmword ptr [ebx + 0x10] // 4156 | movups xmmword ptr [edi + 0x10], xmm1 // 4157 | dec eax // 488d6c2480 | mov dword ptr [ebx + 0x10], ebp // 4881ec80010000 | push edi // 48c745a0feffffff | dec eax $sequence_6 = { 8bd0 c745fc00000000 837a1410 7202 8b12 } // n = 5, score = 100 // 8bd0 | jmp 0xc // c745fc00000000 | mov eax, 1 // 837a1410 | xor edi, edi // 7202 | mov eax, 2 // 8b12 | jmp 0xc $sequence_7 = { e8???????? 90 488d8dd0000000 e8???????? 488b8df0000000 4833cc } // n = 6, score = 100 // e8???????? | // 90 | nop // 488d8dd0000000 | dec eax // e8???????? | // 488b8df0000000 | lea ecx, [ebp + 0xd0] // 4833cc | dec eax $sequence_8 = { 8bcf 7202 8b0f 8b75e4 52 03f1 } // n = 6, score = 100 // 8bcf | dec eax // 7202 | mov dword ptr [esp + 0x78], edi // 8b0f | dec eax // 8b75e4 | mov dword ptr [ebp - 0x80], 0xf // 52 | jmp 0xe // 03f1 | mov eax, 2 $sequence_9 = { 488d542430 488bcb e8???????? 488b5c2430 488d4d88 e8???????? 488b4c2478 } // n = 7, score = 100 // 488d542430 | mov ecx, dword ptr [ebp + 0xf0] // 488bcb | dec eax // e8???????? | // 488b5c2430 | xor ecx, esp // 488d4d88 | dec eax // e8???????? | // 488b4c2478 | lea edx, [esp + 0x30] $sequence_10 = { 488d052e1a0600 4889841958ffffff 488b8358ffffff 48634804 8d51f0 89941954ffffff } // n = 6, score = 100 // 488d052e1a0600 | dec eax // 4889841958ffffff | mov ecx, ebx // 488b8358ffffff | dec eax // 48634804 | mov ebx, dword ptr [esp + 0x30] // 8d51f0 | dec eax // 89941954ffffff | lea ecx, [ebp - 0x78] $sequence_11 = { 48896f18 0f1003 0f1107 0f104b10 0f114f10 48896b10 } // n = 6, score = 100 // 48896f18 | dec eax // 0f1003 | mov ecx, dword ptr [esp + 0x78] // 0f1107 | dec eax // 0f104b10 | lea eax, [0x61a2e] // 0f114f10 | dec eax // 48896b10 | mov dword ptr [ecx + ebx - 0xa8], eax $sequence_12 = { 57 4883ec20 488d0557140700 8bfa } // n = 4, score = 100 // 57 | dec eax // 4883ec20 | mov eax, dword ptr [ebx - 0xa8] // 488d0557140700 | dec eax // 8bfa | arpl word ptr [eax + 4], cx $sequence_13 = { 8d8dccfeffff e9???????? 8d8d48ffffff e9???????? } // n = 4, score = 100 // 8d8dccfeffff | dec eax // e9???????? | // 8d8d48ffffff | sub esp, 0x180 // e9???????? | $sequence_14 = { 03cf 894510 2bc1 0fbe16 } // n = 4, score = 100 // 03cf | mov eax, 1 // 894510 | xor edi, edi // 2bc1 | add esp, 8 // 0fbe16 | mov eax, dword ptr [ebp - 0xf8] condition: 7 of them and filesize < 1347904 }
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