Actor(s): Lazarus Group
There is no description at this point.
rule win_duuzer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.duuzer." 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.duuzer" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 83f804 7408 83c8ff e9???????? } // n = 4, score = 200 // 83f804 | cmp eax, 4 // 7408 | je 0xa // 83c8ff | or eax, 0xffffffff // e9???????? | $sequence_1 = { 0145f0 1155f4 85c9 7533 } // n = 4, score = 100 // 0145f0 | jle 0x33 // 1155f4 | dec eax // 85c9 | arpl di, ax // 7533 | dec esp $sequence_2 = { 4c8b5c2450 4c3b1d???????? 410f44f6 8bc6 } // n = 4, score = 100 // 4c8b5c2450 | mov ecx, 0xcd // 4c3b1d???????? | // 410f44f6 | cmove eax, ecx // 8bc6 | jmp 0x1a $sequence_3 = { 4c8b5c2428 41837b0800 7519 807c243800 } // n = 4, score = 100 // 4c8b5c2428 | inc ecx // 41837b0800 | movzx eax, byte ptr [edx + eax] // 7519 | cmp edx, eax // 807c243800 | jne 0xb7 $sequence_4 = { 00e0 3541000436 41 0023 } // n = 4, score = 100 // 00e0 | mov ecx, dword ptr [ebp + 0x100] // 3541000436 | dec eax // 41 | xor ecx, esp // 0023 | dec esp $sequence_5 = { 014dec 83bf8400000000 7708 398780000000 } // n = 4, score = 100 // 014dec | mov eax, dword ptr [esi + 0x30] // 83bf8400000000 | cmp eax, ebx // 7708 | je 0x20 // 398780000000 | mov edi, dword ptr [eax] $sequence_6 = { 4c8b5c2454 488d542420 488d4c2454 4c895c2420 } // n = 4, score = 100 // 4c8b5c2454 | mov ebx, dword ptr [esp + 0x28] // 488d542420 | inc ecx // 488d4c2454 | cmp dword ptr [ebx + 8], 0 // 4c895c2420 | jne 0x20 $sequence_7 = { 01442410 3bfb 75c4 8b4630 } // n = 4, score = 100 // 01442410 | mov ebx, dword ptr [esp + 0x54] // 3bfb | dec eax // 75c4 | lea edx, [esp + 0x20] // 8b4630 | dec eax $sequence_8 = { 4c8b6348 418bff 85f6 7e2c } // n = 4, score = 100 // 4c8b6348 | dec esp // 418bff | mov ebx, dword ptr [esp + 0x50] // 85f6 | inc ecx // 7e2c | cmove esi, esi $sequence_9 = { 4c8b5110 43880413 ff4128 0fb68111170000 eb0c 85c0 7e16 } // n = 7, score = 100 // 4c8b5110 | dec esp // 43880413 | mov edx, dword ptr [ecx + 0x10] // ff4128 | inc ebx // 0fb68111170000 | mov byte ptr [ebx + edx], al // eb0c | inc dword ptr [ecx + 0x28] // 85c0 | movzx eax, byte ptr [ecx + 0x1711] // 7e16 | jmp 0xe $sequence_10 = { 4c8b5c2420 b88bffffff 4c3b1d???????? b9cd000000 } // n = 4, score = 100 // 4c8b5c2420 | dec esp // b88bffffff | mov ecx, eax // 4c3b1d???????? | // b9cd000000 | inc ecx $sequence_11 = { 00f4 c640001c c740008a460323 d188470383ee } // n = 4, score = 100 // 00f4 | lea edx, [esp + 0x20] // c640001c | dec eax // c740008a460323 | lea ecx, [esp + 0x54] // d188470383ee | dec esp $sequence_12 = { 014dec 66837dec00 0f8efc010000 0fbf45ec } // n = 4, score = 100 // 014dec | add dword ptr [ebx], ecx // 66837dec00 | add dword ptr [esi + 0x4c], ecx // 0f8efc010000 | add dword ptr [esi + 0x48], ecx // 0fbf45ec | add dword ptr [esi + 0x54], ecx $sequence_13 = { 4c8b5750 4c8bc8 410fb65402ff 498d4c02ff } // n = 4, score = 100 // 4c8b5750 | test eax, eax // 4c8bc8 | jle 0x18 // 410fb65402ff | dec esp // 498d4c02ff | mov edx, dword ptr [edi + 0x50] $sequence_14 = { 010b 014e4c 014e48 014e54 } // n = 4, score = 100 // 010b | mov dword ptr [esp + 0x20], ebx // 014e4c | dec eax // 014e48 | lea edx, [esp + 0x28] // 014e54 | dec esp condition: 7 of them and filesize < 491520 }
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