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rule win_nagini_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.nagini." 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.nagini" 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 = { 50 ff15???????? 8bf8 83ff09 7d3e 6a00 } // n = 6, score = 100 // 50 | push eax // ff15???????? | // 8bf8 | mov edi, eax // 83ff09 | cmp edi, 9 // 7d3e | jge 0x40 // 6a00 | push 0 $sequence_1 = { 48 7412 e8???????? c70016000000 e8???????? ebb4 c745e40c9a4200 } // n = 7, score = 100 // 48 | dec eax // 7412 | je 0x14 // e8???????? | // c70016000000 | mov dword ptr [eax], 0x16 // e8???????? | // ebb4 | jmp 0xffffffb6 // c745e40c9a4200 | mov dword ptr [ebp - 0x1c], 0x429a0c $sequence_2 = { e9???????? 8d442428 50 53 ff15???????? 6a65 ff35???????? } // n = 7, score = 100 // e9???????? | // 8d442428 | lea eax, [esp + 0x28] // 50 | push eax // 53 | push ebx // ff15???????? | // 6a65 | push 0x65 // ff35???????? | $sequence_3 = { 0904050904050c 0405 0c04 050c04050d } // n = 4, score = 100 // 0904050904050c | or dword ptr [eax + 0xc050409], eax // 0405 | add al, 5 // 0c04 | or al, 4 // 050c04050d | add eax, 0xd05040c $sequence_4 = { 8935???????? 8b5004 a1???????? 8982cc8a4200 a1???????? 8b4004 834c301402 } // n = 7, score = 100 // 8935???????? | // 8b5004 | mov edx, dword ptr [eax + 4] // a1???????? | // 8982cc8a4200 | mov dword ptr [edx + 0x428acc], eax // a1???????? | // 8b4004 | mov eax, dword ptr [eax + 4] // 834c301402 | or dword ptr [eax + esi + 0x14], 2 $sequence_5 = { 2c63 40 005863 40 007c6340 0023 d18a0688078a } // n = 7, score = 100 // 2c63 | sub al, 0x63 // 40 | inc eax // 005863 | add byte ptr [eax + 0x63], bl // 40 | inc eax // 007c6340 | add byte ptr [ebx + 0x40], bh // 0023 | add byte ptr [ebx], ah // d18a0688078a | ror dword ptr [edx - 0x75f877fa], 1 $sequence_6 = { 07 0505070505 0806 06 07 } // n = 5, score = 100 // 07 | pop es // 0505070505 | add eax, 0x5050705 // 0806 | or byte ptr [esi], al // 06 | push es // 07 | pop es $sequence_7 = { 83c602 eb33 58 668906 83c602 8b0c95c0914200 8a45f8 } // n = 7, score = 100 // 83c602 | add esi, 2 // eb33 | jmp 0x35 // 58 | pop eax // 668906 | mov word ptr [esi], ax // 83c602 | add esi, 2 // 8b0c95c0914200 | mov ecx, dword ptr [edx*4 + 0x4291c0] // 8a45f8 | mov al, byte ptr [ebp - 8] $sequence_8 = { ff75e4 8b0485c0914200 ff3418 ff15???????? 85c0 7518 ff15???????? } // n = 7, score = 100 // ff75e4 | push dword ptr [ebp - 0x1c] // 8b0485c0914200 | mov eax, dword ptr [eax*4 + 0x4291c0] // ff3418 | push dword ptr [eax + ebx] // ff15???????? | // 85c0 | test eax, eax // 7518 | jne 0x1a // ff15???????? | $sequence_9 = { ff15???????? 68007f0000 6a00 8945cc c745d001000000 c745d400000000 c745d8c4384200 } // n = 7, score = 100 // ff15???????? | // 68007f0000 | push 0x7f00 // 6a00 | push 0 // 8945cc | mov dword ptr [ebp - 0x34], eax // c745d001000000 | mov dword ptr [ebp - 0x30], 1 // c745d400000000 | mov dword ptr [ebp - 0x2c], 0 // c745d8c4384200 | mov dword ptr [ebp - 0x28], 0x4238c4 condition: 7 of them and filesize < 12820480 }
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