Actor(s): Tonto Team
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rule win_dexbia_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { f3a5 b918000000 8d7c2425 f3ab 66ab aa } // n = 6, score = 200 // f3a5 | rep movsd dword ptr es:[edi], dword ptr [esi] // b918000000 | mov ecx, 0x18 // 8d7c2425 | lea edi, [esp + 0x25] // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al $sequence_1 = { b910000000 85c0 7415 33c0 bf???????? 68???????? } // n = 6, score = 200 // b910000000 | mov ecx, 0x10 // 85c0 | test eax, eax // 7415 | je 0x17 // 33c0 | xor eax, eax // bf???????? | // 68???????? | $sequence_2 = { ffd7 55 ffd7 5f 5e 5d 33c0 } // n = 7, score = 200 // ffd7 | call edi // 55 | push ebp // ffd7 | call edi // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 33c0 | xor eax, eax $sequence_3 = { 8d4c2418 51 68???????? e8???????? 8d542420 } // n = 5, score = 200 // 8d4c2418 | lea ecx, [esp + 0x18] // 51 | push ecx // 68???????? | // e8???????? | // 8d542420 | lea edx, [esp + 0x20] $sequence_4 = { 7f0e 0fbec3 8a8054714000 83e00f eb02 } // n = 5, score = 200 // 7f0e | jg 0x10 // 0fbec3 | movsx eax, bl // 8a8054714000 | mov al, byte ptr [eax + 0x407154] // 83e00f | and eax, 0xf // eb02 | jmp 4 $sequence_5 = { 68???????? e8???????? 83c438 33c0 5f 5e 5d } // n = 7, score = 200 // 68???????? | // e8???????? | // 83c438 | add esp, 0x38 // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_6 = { 6a10 52 8b08 6aff } // n = 4, score = 200 // 6a10 | push 0x10 // 52 | push edx // 8b08 | mov ecx, dword ptr [eax] // 6aff | push -1 $sequence_7 = { 205a40 004c5a40 00705a 40 0023 d18a0688078a } // n = 6, score = 200 // 205a40 | and byte ptr [edx + 0x40], bl // 004c5a40 | add byte ptr [edx + ebx*2 + 0x40], cl // 00705a | add byte ptr [eax + 0x5a], dh // 40 | inc eax // 0023 | add byte ptr [ebx], ah // d18a0688078a | ror dword ptr [edx - 0x75f877fa], 1 $sequence_8 = { f3ab 66ab aa 8b842418780000 8d4c240c } // n = 5, score = 200 // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // aa | stosb byte ptr es:[edi], al // 8b842418780000 | mov eax, dword ptr [esp + 0x7818] // 8d4c240c | lea ecx, [esp + 0xc] $sequence_9 = { 66895c2418 66899c248c000000 f3ab 66ab b981000000 } // n = 5, score = 200 // 66895c2418 | mov word ptr [esp + 0x18], bx // 66899c248c000000 | mov word ptr [esp + 0x8c], bx // f3ab | rep stosd dword ptr es:[edi], eax // 66ab | stosw word ptr es:[edi], ax // b981000000 | mov ecx, 0x81 condition: 7 of them and filesize < 106496 }
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