Actor(s): Silent Chollima
There is no description at this point.
rule win_andardoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.andardoor." 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.andardoor" 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 = { 4863c7 442bc7 4803d0 4533c9 ff15???????? 85c0 } // n = 6, score = 200 // 4863c7 | jmp 0x18f4 // 442bc7 | xor ecx, ecx // 4803d0 | xor edx, edx // 4533c9 | nop // ff15???????? | // 85c0 | movzx eax, byte ptr [edx + ebx] $sequence_1 = { 3bc3 7d15 4863d3 41b842000000 488bcf ff15???????? } // n = 6, score = 200 // 3bc3 | lea eax, [edi - 1] // 7d15 | mov dword ptr [esp + 0x44], edi // 4863d3 | dec eax // 41b842000000 | mov edx, dword ptr [esp + 0x40] // 488bcf | dec eax // ff15???????? | $sequence_2 = { 0f8c59ffffff 488b3d???????? 33f6 488d4f01 } // n = 4, score = 200 // 0f8c59ffffff | dec eax // 488b3d???????? | // 33f6 | lea edx, [esp + 0x70] // 488d4f01 | dec eax $sequence_3 = { 488b0d???????? ebb3 33d2 488d4d80 } // n = 4, score = 200 // 488b0d???????? | // ebb3 | mov dword ptr [ebp + 0x250], eax // 33d2 | dec eax // 488d4d80 | sub esp, 0x870 $sequence_4 = { 488b4f29 488d542420 41b808000000 4863c3 442bc3 4803d0 4533c9 } // n = 7, score = 200 // 488b4f29 | test al, al // 488d542420 | jne 0x99 // 41b808000000 | dec eax // 4863c3 | mov edx, dword ptr [esp + 0x40] // 442bc3 | dec eax // 4803d0 | mov ecx, edi // 4533c9 | dec esp $sequence_5 = { 40383d???????? 740f 488d95a0050000 488bcb e8???????? 4c8d442460 33c9 } // n = 7, score = 200 // 40383d???????? | // 740f | mov edx, dword ptr [ebp + 0x740] // 488d95a0050000 | dec esp // 488bcb | lea eax, [0x9819] // e8???????? | // 4c8d442460 | dec ecx // 33c9 | mov ecx, esi $sequence_6 = { 488b4b31 4885c9 740a ff15???????? 48897b31 488d4b01 } // n = 6, score = 200 // 488b4b31 | inc ecx // 4885c9 | mov ebx, 0xe3 // 740a | inc ecx // ff15???????? | // 48897b31 | push esi // 488d4b01 | xor ebp, ebp $sequence_7 = { 66833c4300 75f6 488d95c0000000 4883c9ff } // n = 4, score = 200 // 66833c4300 | lea eax, [0x58a8] // 75f6 | dec eax // 488d95c0000000 | cmp ecx, eax // 4883c9ff | je 0x877 $sequence_8 = { 8d47ff 48c744243803000000 89442430 c744242865000000 4c8d4d90 4c89642420 } // n = 6, score = 200 // 8d47ff | dec ecx // 48c744243803000000 | ror ecx, cl // 89442430 | dec eax // c744242865000000 | lea ecx, [0x1bbaa] // 4c8d4d90 | dec esp // 4c89642420 | xor ecx, edx $sequence_9 = { 4883c002 4883f80a 75d6 e8???????? 488b4b08 4885c9 7405 } // n = 7, score = 200 // 4883c002 | dec eax // 4883f80a | lea ecx, [0xeb82] // 75d6 | mov dword ptr [ebx + 0x50], eax // e8???????? | // 488b4b08 | mov byte ptr [ebx + 0x54], 1 // 4885c9 | jmp 0xce8 // 7405 | mov dword ptr [ebx + 0x50], eax condition: 7 of them and filesize < 339968 }
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