Actor(s): Tonto Team
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rule win_dexbia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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 = { f3ab 66ab aa c744241400000000 } // n = 4, score = 200 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // c744241400000000 | mov dword ptr [esp + 0x14], 0 $sequence_1 = { 85c0 0f8458010000 be???????? 8d442414 8a10 } // n = 5, score = 200 // 85c0 | test eax, eax // 0f8458010000 | je 0x15e // be???????? | // 8d442414 | lea eax, [esp + 0x14] // 8a10 | mov dl, byte ptr [eax] $sequence_2 = { 55 56 8bb424f81b0000 57 b911010000 8dbc24b4030000 } // n = 6, score = 200 // 55 | push ebp // 56 | push esi // 8bb424f81b0000 | mov esi, dword ptr [esp + 0x1bf8] // 57 | push edi // b911010000 | mov ecx, 0x111 // 8dbc24b4030000 | lea edi, [esp + 0x3b4] $sequence_3 = { 33c0 8dbc248a000000 66c78424880000000000 f3ab 66ab b908000000 } // n = 6, score = 200 // 33c0 | xor eax, eax // 8dbc248a000000 | lea edi, [esp + 0x8a] // 66c78424880000000000 | mov word ptr [esp + 0x88], 0 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // b908000000 | mov ecx, 8 $sequence_4 = { 8bd8 85db 0f8418020000 8d442410 6a04 } // n = 5, score = 200 // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 0f8418020000 | je 0x21e // 8d442410 | lea eax, [esp + 0x10] // 6a04 | push 4 $sequence_5 = { 6800280000 50 68???????? 8d8c24602c0000 53 51 899424882c0000 } // n = 7, score = 200 // 6800280000 | push 0x2800 // 50 | push eax // 68???????? | // 8d8c24602c0000 | lea ecx, [esp + 0x2c60] // 53 | push ebx // 51 | push ecx // 899424882c0000 | mov dword ptr [esp + 0x2c88], edx $sequence_6 = { 85db 0f84cb010000 8d442410 6a04 50 } // n = 5, score = 200 // 85db | test ebx, ebx // 0f84cb010000 | je 0x1d1 // 8d442410 | lea eax, [esp + 0x10] // 6a04 | push 4 // 50 | push eax $sequence_7 = { 7448 6a00 6a00 8d8424bc010000 6a00 50 68???????? } // n = 7, score = 200 // 7448 | je 0x4a // 6a00 | push 0 // 6a00 | push 0 // 8d8424bc010000 | lea eax, [esp + 0x1bc] // 6a00 | push 0 // 50 | push eax // 68???????? | $sequence_8 = { 8ac8 80c120 8888a09e4000 eb1f 83f861 } // n = 5, score = 200 // 8ac8 | mov cl, al // 80c120 | add cl, 0x20 // 8888a09e4000 | mov byte ptr [eax + 0x409ea0], cl // eb1f | jmp 0x21 // 83f861 | cmp eax, 0x61 $sequence_9 = { 8bc1 8d74240c c1e902 f3a5 8bc8 83e103 } // n = 6, score = 200 // 8bc1 | mov eax, ecx // 8d74240c | lea esi, [esp + 0xc] // c1e902 | shr ecx, 2 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // 8bc8 | mov ecx, eax // 83e103 | and ecx, 3 condition: 7 of them and filesize < 106496 }
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