Actor(s): Lazarus Group
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rule win_neddnloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.neddnloader." 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.neddnloader" 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 = { 0facc81e 50 8d856cffffff 50 } // n = 4, score = 200 // 0facc81e | shrd eax, ecx, 0x1e // 50 | push eax // 8d856cffffff | lea eax, [ebp - 0x94] // 50 | push eax $sequence_1 = { 68???????? e8???????? 83c41c 6800020000 8d85fcfbffff } // n = 5, score = 200 // 68???????? | // e8???????? | // 83c41c | add esp, 0x1c // 6800020000 | push 0x200 // 8d85fcfbffff | lea eax, [ebp - 0x404] $sequence_2 = { 8b06 8907 8b4604 894704 83c608 } // n = 5, score = 200 // 8b06 | mov eax, dword ptr [esi] // 8907 | mov dword ptr [edi], eax // 8b4604 | mov eax, dword ptr [esi + 4] // 894704 | mov dword ptr [edi + 4], eax // 83c608 | add esi, 8 $sequence_3 = { b9ff000000 f7f1 03d8 8813 43 895dfc eb02 } // n = 7, score = 200 // b9ff000000 | mov ecx, 0xff // f7f1 | div ecx // 03d8 | add ebx, eax // 8813 | mov byte ptr [ebx], dl // 43 | inc ebx // 895dfc | mov dword ptr [ebp - 4], ebx // eb02 | jmp 4 $sequence_4 = { 7217 8b06 3b07 7511 8b45fc ff45fc } // n = 6, score = 200 // 7217 | jb 0x19 // 8b06 | mov eax, dword ptr [esi] // 3b07 | cmp eax, dword ptr [edi] // 7511 | jne 0x13 // 8b45fc | mov eax, dword ptr [ebp - 4] // ff45fc | inc dword ptr [ebp - 4] $sequence_5 = { 337008 c1e918 8975ec c1eb08 } // n = 4, score = 200 // 337008 | xor esi, dword ptr [eax + 8] // c1e918 | shr ecx, 0x18 // 8975ec | mov dword ptr [ebp - 0x14], esi // c1eb08 | shr ebx, 8 $sequence_6 = { e9???????? 57 8bb880000000 6a14 03fb 57 } // n = 6, score = 200 // e9???????? | // 57 | push edi // 8bb880000000 | mov edi, dword ptr [eax + 0x80] // 6a14 | push 0x14 // 03fb | add edi, ebx // 57 | push edi $sequence_7 = { 51 51 53 8bd8 85db 7e57 } // n = 6, score = 200 // 51 | push ecx // 51 | push ecx // 53 | push ebx // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7e57 | jle 0x59 $sequence_8 = { 8bf8 0345ec ff45f0 8955ec 8b55f8 83c2f4 8945e4 } // n = 7, score = 200 // 8bf8 | mov edi, eax // 0345ec | add eax, dword ptr [ebp - 0x14] // ff45f0 | inc dword ptr [ebp - 0x10] // 8955ec | mov dword ptr [ebp - 0x14], edx // 8b55f8 | mov edx, dword ptr [ebp - 8] // 83c2f4 | add edx, -0xc // 8945e4 | mov dword ptr [ebp - 0x1c], eax $sequence_9 = { 6800300000 56 50 ffd7 8945fc 85c0 } // n = 6, score = 200 // 6800300000 | push 0x3000 // 56 | push esi // 50 | push eax // ffd7 | call edi // 8945fc | mov dword ptr [ebp - 4], eax // 85c0 | test eax, eax condition: 7 of them and filesize < 237568 }
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