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rule win_magniber_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.magniber." 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.magniber" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { 66890a 8b45f8 83c002 8945f8 b92a000000 } // n = 5, score = 400 // 66890a | mov word ptr [edx], cx // 8b45f8 | mov eax, dword ptr [ebp - 8] // 83c002 | add eax, 2 // 8945f8 | mov dword ptr [ebp - 8], eax // b92a000000 | mov ecx, 0x2a $sequence_1 = { 85c0 7502 ebb9 8b5508 52 } // n = 5, score = 400 // 85c0 | test eax, eax // 7502 | jne 4 // ebb9 | jmp 0xffffffbb // 8b5508 | mov edx, dword ptr [ebp + 8] // 52 | push edx $sequence_2 = { 8b5508 8b826c040000 50 ff15???????? 85c0 740e } // n = 6, score = 400 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b826c040000 | mov eax, dword ptr [edx + 0x46c] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax // 740e | je 0x10 $sequence_3 = { c7856cffffffc09e4000 c78570ffffffc89e4000 c78574ffffffd09e4000 c78578ffffffd89e4000 c7857cffffffe09e4000 c74580e89e4000 } // n = 6, score = 400 // c7856cffffffc09e4000 | mov dword ptr [ebp - 0x94], 0x409ec0 // c78570ffffffc89e4000 | mov dword ptr [ebp - 0x90], 0x409ec8 // c78574ffffffd09e4000 | mov dword ptr [ebp - 0x8c], 0x409ed0 // c78578ffffffd89e4000 | mov dword ptr [ebp - 0x88], 0x409ed8 // c7857cffffffe09e4000 | mov dword ptr [ebp - 0x84], 0x409ee0 // c74580e89e4000 | mov dword ptr [ebp - 0x80], 0x409ee8 $sequence_4 = { 6a7a 6a61 e8???????? 83c408 8b4dfc } // n = 5, score = 400 // 6a7a | push 0x7a // 6a61 | push 0x61 // e8???????? | // 83c408 | add esp, 8 // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_5 = { ba65000000 668955ee b878000000 668945f0 b965000000 } // n = 5, score = 400 // ba65000000 | mov edx, 0x65 // 668955ee | mov word ptr [ebp - 0x12], dx // b878000000 | mov eax, 0x78 // 668945f0 | mov word ptr [ebp - 0x10], ax // b965000000 | mov ecx, 0x65 $sequence_6 = { 83c408 6804010000 8d859cfdffff 50 } // n = 4, score = 400 // 83c408 | add esp, 8 // 6804010000 | push 0x104 // 8d859cfdffff | lea eax, dword ptr [ebp - 0x264] // 50 | push eax $sequence_7 = { ba63000000 668955b2 b820000000 668945b4 b970000000 66894db6 ba69000000 } // n = 7, score = 400 // ba63000000 | mov edx, 0x63 // 668955b2 | mov word ptr [ebp - 0x4e], dx // b820000000 | mov eax, 0x20 // 668945b4 | mov word ptr [ebp - 0x4c], ax // b970000000 | mov ecx, 0x70 // 66894db6 | mov word ptr [ebp - 0x4a], cx // ba69000000 | mov edx, 0x69 $sequence_8 = { ba63000000 668955b2 b820000000 668945b4 b970000000 66894db6 } // n = 6, score = 400 // ba63000000 | mov edx, 0x63 // 668955b2 | mov word ptr [ebp - 0x4e], dx // b820000000 | mov eax, 0x20 // 668945b4 | mov word ptr [ebp - 0x4c], ax // b970000000 | mov ecx, 0x70 // 66894db6 | mov word ptr [ebp - 0x4a], cx $sequence_9 = { 52 8d8554ffffff 50 8b8d24feffff 51 8d9510feffff 52 } // n = 7, score = 400 // 52 | push edx // 8d8554ffffff | lea eax, dword ptr [ebp - 0xac] // 50 | push eax // 8b8d24feffff | mov ecx, dword ptr [ebp - 0x1dc] // 51 | push ecx // 8d9510feffff | lea edx, dword ptr [ebp - 0x1f0] // 52 | push edx condition: 7 of them and filesize < 114688 }
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