Actor(s): Lazarus Group
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rule win_neddnloader_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "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 = { 3c75 3c85 3c92 3c9c 3cb2 3cbe 3cd1 } // n = 7, score = 200 // 3c75 | cmp al, 0x75 // 3c85 | cmp al, 0x85 // 3c92 | cmp al, 0x92 // 3c9c | cmp al, 0x9c // 3cb2 | cmp al, 0xb2 // 3cbe | cmp al, 0xbe // 3cd1 | cmp al, 0xd1 $sequence_1 = { 397dfc 7652 33c0 50 50 8945f0 } // n = 6, score = 200 // 397dfc | cmp dword ptr [ebp - 4], edi // 7652 | jbe 0x54 // 33c0 | xor eax, eax // 50 | push eax // 50 | push eax // 8945f0 | mov dword ptr [ebp - 0x10], eax $sequence_2 = { 8b7510 8b7d0c 83451010 836dfc10 8345f810 4b a5 } // n = 7, score = 200 // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 8b7d0c | mov edi, dword ptr [ebp + 0xc] // 83451010 | add dword ptr [ebp + 0x10], 0x10 // 836dfc10 | sub dword ptr [ebp - 4], 0x10 // 8345f810 | add dword ptr [ebp - 8], 0x10 // 4b | dec ebx // a5 | movsd dword ptr es:[edi], dword ptr [esi] $sequence_3 = { 8975e4 8945e8 894dbc 894dc0 894dc4 } // n = 5, score = 200 // 8975e4 | mov dword ptr [ebp - 0x1c], esi // 8945e8 | mov dword ptr [ebp - 0x18], eax // 894dbc | mov dword ptr [ebp - 0x44], ecx // 894dc0 | mov dword ptr [ebp - 0x40], ecx // 894dc4 | mov dword ptr [ebp - 0x3c], ecx $sequence_4 = { 894508 e8???????? 83c40c 037d08 2975f0 ff4d08 } // n = 6, score = 200 // 894508 | mov dword ptr [ebp + 8], eax // e8???????? | // 83c40c | add esp, 0xc // 037d08 | add edi, dword ptr [ebp + 8] // 2975f0 | sub dword ptr [ebp - 0x10], esi // ff4d08 | dec dword ptr [ebp + 8] $sequence_5 = { 53 ff750c 03c7 8906 51 8bfe 895034 } // n = 7, score = 200 // 53 | push ebx // ff750c | push dword ptr [ebp + 0xc] // 03c7 | add eax, edi // 8906 | mov dword ptr [esi], eax // 51 | push ecx // 8bfe | mov edi, esi // 895034 | mov dword ptr [eax + 0x34], edx $sequence_6 = { 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_7 = { 89442414 33c0 53 33db 56 } // n = 5, score = 200 // 89442414 | mov dword ptr [esp + 0x14], eax // 33c0 | xor eax, eax // 53 | push ebx // 33db | xor ebx, ebx // 56 | push esi $sequence_8 = { 8b1d???????? 56 ffd3 3985f0fbffff } // n = 4, score = 200 // 8b1d???????? | // 56 | push esi // ffd3 | call ebx // 3985f0fbffff | cmp dword ptr [ebp - 0x410], eax $sequence_9 = { 891c81 8d7301 8b06 69c0b179379e c1e814 } // n = 5, score = 200 // 891c81 | mov dword ptr [ecx + eax*4], ebx // 8d7301 | lea esi, [ebx + 1] // 8b06 | mov eax, dword ptr [esi] // 69c0b179379e | imul eax, eax, 0x9e3779b1 // c1e814 | shr eax, 0x14 condition: 7 of them and filesize < 237568 }
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