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rule win_bangat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.bangat." 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.bangat" 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 = { 39bd34ffffff 7506 898e10020000 399d34ffffff 750a c7861002000003000000 834dfcff } // n = 7, score = 100 // 39bd34ffffff | cmp dword ptr [ebp - 0xcc], edi // 7506 | jne 8 // 898e10020000 | mov dword ptr [esi + 0x210], ecx // 399d34ffffff | cmp dword ptr [ebp - 0xcc], ebx // 750a | jne 0xc // c7861002000003000000 | mov dword ptr [esi + 0x210], 3 // 834dfcff | or dword ptr [ebp - 4], 0xffffffff $sequence_1 = { 51 89442404 ff5208 83c404 85c0 7504 83c408 } // n = 7, score = 100 // 51 | push ecx // 89442404 | mov dword ptr [esp + 4], eax // ff5208 | call dword ptr [edx + 8] // 83c404 | add esp, 4 // 85c0 | test eax, eax // 7504 | jne 6 // 83c408 | add esp, 8 $sequence_2 = { 53 50 8d85b0fbffff 6820030000 50 ff75ec ffd6 } // n = 7, score = 100 // 53 | push ebx // 50 | push eax // 8d85b0fbffff | lea eax, dword ptr [ebp - 0x450] // 6820030000 | push 0x320 // 50 | push eax // ff75ec | push dword ptr [ebp - 0x14] // ffd6 | call esi $sequence_3 = { e9???????? 8b4d3c 3d60100000 8b7104 0f85a4000000 8b4544 } // n = 6, score = 100 // e9???????? | // 8b4d3c | mov ecx, dword ptr [ebp + 0x3c] // 3d60100000 | cmp eax, 0x1060 // 8b7104 | mov esi, dword ptr [ecx + 4] // 0f85a4000000 | jne 0xaa // 8b4544 | mov eax, dword ptr [ebp + 0x44] $sequence_4 = { 8b8290000000 894840 e9???????? a806 0f8586050000 a880 0f845c020000 } // n = 7, score = 100 // 8b8290000000 | mov eax, dword ptr [edx + 0x90] // 894840 | mov dword ptr [eax + 0x40], ecx // e9???????? | // a806 | test al, 6 // 0f8586050000 | jne 0x58c // a880 | test al, 0x80 // 0f845c020000 | je 0x262 $sequence_5 = { 57 7525 6875050000 68???????? 68c4000000 68a9000000 6a14 } // n = 7, score = 100 // 57 | push edi // 7525 | jne 0x27 // 6875050000 | push 0x575 // 68???????? | // 68c4000000 | push 0xc4 // 68a9000000 | push 0xa9 // 6a14 | push 0x14 $sequence_6 = { 56 57 e8???????? be04010000 bf???????? 56 6a00 } // n = 7, score = 100 // 56 | push esi // 57 | push edi // e8???????? | // be04010000 | mov esi, 0x104 // bf???????? | // 56 | push esi // 6a00 | push 0 $sequence_7 = { 83c40c 85c0 7e1e 3bc7 7428 f685f800000001 751f } // n = 7, score = 100 // 83c40c | add esp, 0xc // 85c0 | test eax, eax // 7e1e | jle 0x20 // 3bc7 | cmp eax, edi // 7428 | je 0x2a // f685f800000001 | test byte ptr [ebp + 0xf8], 1 // 751f | jne 0x21 $sequence_8 = { 83c464 c3 8b842488000000 50 e8???????? 83c404 33c0 } // n = 7, score = 100 // 83c464 | add esp, 0x64 // c3 | ret // 8b842488000000 | mov eax, dword ptr [esp + 0x88] // 50 | push eax // e8???????? | // 83c404 | add esp, 4 // 33c0 | xor eax, eax $sequence_9 = { 83c410 3bc5 750a c705????????90b74700 68da000000 68???????? } // n = 6, score = 100 // 83c410 | add esp, 0x10 // 3bc5 | cmp eax, ebp // 750a | jne 0xc // c705????????90b74700 | // 68da000000 | push 0xda // 68???????? | condition: 7 of them and filesize < 1228800 }
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