Actor(s): Lazarus Group
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rule win_neddnloader_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.neddnloader" 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 = { 0f8783000000 3bfa 731b 52 8bce } // n = 5, score = 200 // 0f8783000000 | ja 0x89 // 3bfa | cmp edi, edx // 731b | jae 0x1d // 52 | push edx // 8bce | mov ecx, esi $sequence_1 = { 8b45ec 8b4dfc ff45fc eb05 } // n = 4, score = 200 // 8b45ec | mov eax, dword ptr [ebp - 0x14] // 8b4dfc | mov ecx, dword ptr [ebp - 4] // ff45fc | inc dword ptr [ebp - 4] // eb05 | jmp 7 $sequence_2 = { ffd6 8b442420 eb02 33c0 8b8c24b4020000 5f 5e } // n = 7, score = 200 // ffd6 | call esi // 8b442420 | mov eax, dword ptr [esp + 0x20] // eb02 | jmp 4 // 33c0 | xor eax, eax // 8b8c24b4020000 | mov ecx, dword ptr [esp + 0x2b4] // 5f | pop edi // 5e | pop esi $sequence_3 = { 0fb70c07 6685c9 740a 668908 83c002 } // n = 5, score = 200 // 0fb70c07 | movzx ecx, word ptr [edi + eax] // 6685c9 | test cx, cx // 740a | je 0xc // 668908 | mov word ptr [eax], cx // 83c002 | add eax, 2 $sequence_4 = { 33c0 befe010000 56 50 6689842418040000 8d84241a040000 50 } // n = 7, score = 200 // 33c0 | xor eax, eax // befe010000 | mov esi, 0x1fe // 56 | push esi // 50 | push eax // 6689842418040000 | mov word ptr [esp + 0x418], ax // 8d84241a040000 | lea eax, [esp + 0x41a] // 50 | push eax $sequence_5 = { 85c0 7454 ff7730 8b46fc 0345fc 6a04 6800100000 } // n = 7, score = 200 // 85c0 | test eax, eax // 7454 | je 0x56 // ff7730 | push dword ptr [edi + 0x30] // 8b46fc | mov eax, dword ptr [esi - 4] // 0345fc | add eax, dword ptr [ebp - 4] // 6a04 | push 4 // 6800100000 | push 0x1000 $sequence_6 = { 8b02 8b4024 c3 55 8bec 51 57 } // n = 7, score = 200 // 8b02 | mov eax, dword ptr [edx] // 8b4024 | mov eax, dword ptr [eax + 0x24] // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // 51 | push ecx // 57 | push edi $sequence_7 = { 81f9ff000000 74e8 8b4db4 8b55b8 03d1 3bd1 0f82df000000 } // n = 7, score = 200 // 81f9ff000000 | cmp ecx, 0xff // 74e8 | je 0xffffffea // 8b4db4 | mov ecx, dword ptr [ebp - 0x4c] // 8b55b8 | mov edx, dword ptr [ebp - 0x48] // 03d1 | add edx, ecx // 3bd1 | cmp edx, ecx // 0f82df000000 | jb 0xe5 $sequence_8 = { 0f8e06010000 6a10 58 8bf3 83e60f } // n = 5, score = 200 // 0f8e06010000 | jle 0x10c // 6a10 | push 0x10 // 58 | pop eax // 8bf3 | mov esi, ebx // 83e60f | and esi, 0xf $sequence_9 = { 3bc6 7217 8b07 3b06 7511 8b4514 ff4514 } // n = 7, score = 200 // 3bc6 | cmp eax, esi // 7217 | jb 0x19 // 8b07 | mov eax, dword ptr [edi] // 3b06 | cmp eax, dword ptr [esi] // 7511 | jne 0x13 // 8b4514 | mov eax, dword ptr [ebp + 0x14] // ff4514 | inc dword ptr [ebp + 0x14] condition: 7 of them and filesize < 237568 }
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