Actor(s): Tonto Team
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rule win_dexbia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.dexbia." 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.dexbia" 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 = { 5d 33c0 5b 81c408100000 c3 56 } // n = 6, score = 200 // 5d | pop ebp // 33c0 | xor eax, eax // 5b | pop ebx // 81c408100000 | add esp, 0x1008 // c3 | ret // 56 | push esi $sequence_1 = { 56 8bf1 c1e603 3b9698844000 0f851c010000 a1???????? 83f801 } // n = 7, score = 200 // 56 | push esi // 8bf1 | mov esi, ecx // c1e603 | shl esi, 3 // 3b9698844000 | cmp edx, dword ptr [esi + 0x408498] // 0f851c010000 | jne 0x122 // a1???????? | // 83f801 | cmp eax, 1 $sequence_2 = { 8d4c2438 51 ff15???????? a1???????? b907000000 } // n = 5, score = 200 // 8d4c2438 | lea ecx, [esp + 0x38] // 51 | push ecx // ff15???????? | // a1???????? | // b907000000 | mov ecx, 7 $sequence_3 = { 8dbc24f9070000 c68424f807000000 f3ab 66ab 8d8c2488000000 } // n = 5, score = 200 // 8dbc24f9070000 | lea edi, [esp + 0x7f9] // c68424f807000000 | mov byte ptr [esp + 0x7f8], 0 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // 8d8c2488000000 | lea ecx, [esp + 0x88] $sequence_4 = { 0fb6d2 f682a19f400004 740c ff01 85f6 7406 } // n = 6, score = 200 // 0fb6d2 | movzx edx, dl // f682a19f400004 | test byte ptr [edx + 0x409fa1], 4 // 740c | je 0xe // ff01 | inc dword ptr [ecx] // 85f6 | test esi, esi // 7406 | je 8 $sequence_5 = { 33c0 8dbc249d120000 889c249c260000 f3ab } // n = 4, score = 200 // 33c0 | xor eax, eax // 8dbc249d120000 | lea edi, [esp + 0x129d] // 889c249c260000 | mov byte ptr [esp + 0x269c], bl // f3ab | rep stosd dword ptr es:[edi], eax $sequence_6 = { ff15???????? 85c0 7437 8d542418 } // n = 4, score = 200 // ff15???????? | // 85c0 | test eax, eax // 7437 | je 0x39 // 8d542418 | lea edx, [esp + 0x18] $sequence_7 = { 85f6 7453 68???????? 56 ff15???????? 85c0 } // n = 6, score = 200 // 85f6 | test esi, esi // 7453 | je 0x55 // 68???????? | // 56 | push esi // ff15???????? | // 85c0 | test eax, eax $sequence_8 = { 56 ff15???????? 85c0 7443 8b8c242c100000 8b942428100000 } // n = 6, score = 200 // 56 | push esi // ff15???????? | // 85c0 | test eax, eax // 7443 | je 0x45 // 8b8c242c100000 | mov ecx, dword ptr [esp + 0x102c] // 8b942428100000 | mov edx, dword ptr [esp + 0x1028] $sequence_9 = { 6a00 6800004804 6a00 6a00 68???????? 52 } // n = 6, score = 200 // 6a00 | push 0 // 6800004804 | push 0x4480000 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 52 | push edx condition: 7 of them and filesize < 106496 }
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