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rule win_bangat_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { ffd6 59 85c0 59 74d4 8d85dcfcffff } // n = 6, score = 100 // ffd6 | call esi // 59 | pop ecx // 85c0 | test eax, eax // 59 | pop ecx // 74d4 | je 0xffffffd6 // 8d85dcfcffff | lea eax, [ebp - 0x324] $sequence_1 = { e8???????? 83c404 85c0 7f29 6864030000 68???????? 68e0000000 } // n = 7, score = 100 // e8???????? | // 83c404 | add esp, 4 // 85c0 | test eax, eax // 7f29 | jg 0x2b // 6864030000 | push 0x364 // 68???????? | // 68e0000000 | push 0xe0 $sequence_2 = { c6005c 40 c1fa04 83e20f c60078 40 8a92b0254900 } // n = 7, score = 100 // c6005c | mov byte ptr [eax], 0x5c // 40 | inc eax // c1fa04 | sar edx, 4 // 83e20f | and edx, 0xf // c60078 | mov byte ptr [eax], 0x78 // 40 | inc eax // 8a92b0254900 | mov dl, byte ptr [edx + 0x4925b0] $sequence_3 = { 6880010000 68???????? 6a10 6a66 6a2a e8???????? 83c414 } // n = 7, score = 100 // 6880010000 | push 0x180 // 68???????? | // 6a10 | push 0x10 // 6a66 | push 0x66 // 6a2a | push 0x2a // e8???????? | // 83c414 | add esp, 0x14 $sequence_4 = { 56 50 ff7508 e8???????? 57 891d???????? ff15???????? } // n = 7, score = 100 // 56 | push esi // 50 | push eax // ff7508 | push dword ptr [ebp + 8] // e8???????? | // 57 | push edi // 891d???????? | // ff15???????? | $sequence_5 = { 83c8e0 40 bf20000000 2bf8 57 53 55 } // n = 7, score = 100 // 83c8e0 | or eax, 0xffffffe0 // 40 | inc eax // bf20000000 | mov edi, 0x20 // 2bf8 | sub edi, eax // 57 | push edi // 53 | push ebx // 55 | push ebp $sequence_6 = { 894c2418 e8???????? 8b542418 8d442418 33c9 3bd5 8b542440 } // n = 7, score = 100 // 894c2418 | mov dword ptr [esp + 0x18], ecx // e8???????? | // 8b542418 | mov edx, dword ptr [esp + 0x18] // 8d442418 | lea eax, [esp + 0x18] // 33c9 | xor ecx, ecx // 3bd5 | cmp edx, ebp // 8b542440 | mov edx, dword ptr [esp + 0x40] $sequence_7 = { 8b6c245c 8b5c2458 898424d4000000 899424d8000000 8bf5 b917000000 8bc3 } // n = 7, score = 100 // 8b6c245c | mov ebp, dword ptr [esp + 0x5c] // 8b5c2458 | mov ebx, dword ptr [esp + 0x58] // 898424d4000000 | mov dword ptr [esp + 0xd4], eax // 899424d8000000 | mov dword ptr [esp + 0xd8], edx // 8bf5 | mov esi, ebp // b917000000 | mov ecx, 0x17 // 8bc3 | mov eax, ebx $sequence_8 = { 745c 8b4d68 85ff 51 55 7437 8b4d3c } // n = 7, score = 100 // 745c | je 0x5e // 8b4d68 | mov ecx, dword ptr [ebp + 0x68] // 85ff | test edi, edi // 51 | push ecx // 55 | push ebp // 7437 | je 0x39 // 8b4d3c | mov ecx, dword ptr [ebp + 0x3c] $sequence_9 = { 85c0 0f8454010000 8b5558 b907000000 c7453420110000 c74538f0000000 894d50 } // n = 7, score = 100 // 85c0 | test eax, eax // 0f8454010000 | je 0x15a // 8b5558 | mov edx, dword ptr [ebp + 0x58] // b907000000 | mov ecx, 7 // c7453420110000 | mov dword ptr [ebp + 0x34], 0x1120 // c74538f0000000 | mov dword ptr [ebp + 0x38], 0xf0 // 894d50 | mov dword ptr [ebp + 0x50], ecx condition: 7 of them and filesize < 1228800 }
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