Actor(s): APT-Q-12
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rule win_unidentified_100_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.unidentified_100." 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.unidentified_100" 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 = { 488bf8 33c0 b9e2010000 f3aa 488d842460190000 488d0d8ff40100 } // n = 6, score = 100 // 488bf8 | mov dword ptr [esp + 0x34], eax // 33c0 | mov dword ptr [esp + 0x3c], 0 // b9e2010000 | jmp 0x1be // f3aa | mov eax, dword ptr [esp + 0x3c] // 488d842460190000 | inc eax // 488d0d8ff40100 | mov dword ptr [esp + 0x34], eax $sequence_1 = { ba2c010000 488b8c24a0030000 e8???????? 488d842410010000 488bf8 33c0 } // n = 6, score = 100 // ba2c010000 | lea esp, [0x6940] // 488b8c24a0030000 | inc bp // e8???????? | // 488d842410010000 | cmp dword ptr [esi], edi // 488bf8 | jae 0x7ff // 33c0 | inc ecx $sequence_2 = { 837c243803 7420 eb26 c744243001000000 eb1c } // n = 5, score = 100 // 837c243803 | mov byte ptr [edx + ecx], al // 7420 | mov eax, 1 // eb26 | dec eax // c744243001000000 | imul eax, eax, 0 // eb1c | dec eax $sequence_3 = { b901000000 486bc903 488b9424c8000000 0fb61402 } // n = 4, score = 100 // b901000000 | sar eax, 6 // 486bc903 | dec eax // 488b9424c8000000 | lea ecx, [0x16f70] // 0fb61402 | inc ecx $sequence_4 = { 4c8d4c2460 41b802000000 488d942410020000 488b4c2448 } // n = 4, score = 100 // 4c8d4c2460 | mov ecx, 0x17e // 41b802000000 | rep stosb byte ptr es:[edi], al // 488d942410020000 | dec eax // 488b4c2448 | mov edi, eax $sequence_5 = { 4533c0 8b9424c0200000 488d8c2400060000 ff15???????? } // n = 4, score = 100 // 4533c0 | cmp eax, ecx // 8b9424c0200000 | jge 0x291 // 488d8c2400060000 | movzx eax, byte ptr [esp + 0x20] // ff15???????? | $sequence_6 = { c6040101 eb6f 0fb6442430 83f801 7e65 b801000000 486bc000 } // n = 7, score = 100 // c6040101 | mov esi, esi // eb6f | dec eax // 0fb6442430 | sar esi, 6 // 83f801 | dec eax // 7e65 | lea edi, [eax + eax*8] // b801000000 | je 0x250 // 486bc000 | dec esp $sequence_7 = { 33db 488d3d3d8a0100 488b0c3b 4885c9 740a e8???????? 4883243b00 } // n = 7, score = 100 // 33db | mov eax, dword ptr [esp + 0x398] // 488d3d3d8a0100 | dec eax // 488b0c3b | mov eax, dword ptr [esp + 0x398] // 4885c9 | dec eax // 740a | cmp dword ptr [eax], 0 // e8???????? | // 4883243b00 | je 0x480 $sequence_8 = { e9???????? 418bd2 4d85c0 7e2d 482bf7 488d1d4febfeff 8a043e } // n = 7, score = 100 // e9???????? | // 418bd2 | movzx eax, byte ptr [esp + 0x20] // 4d85c0 | cmp eax, 4 // 7e2d | jge 0x313 // 482bf7 | movzx eax, byte ptr [esp + 0x20] // 488d1d4febfeff | movzx eax, byte ptr [esp + 0x20] // 8a043e | inc al $sequence_9 = { 488b8c2478050000 ff15???????? 33c0 488b8c2440050000 4833cc e8???????? } // n = 6, score = 100 // 488b8c2478050000 | mov ecx, dword ptr [esp + 0x20] // ff15???????? | // 33c0 | movzx eax, byte ptr [ecx + eax] // 488b8c2440050000 | cmp eax, 4 // 4833cc | jge 0x13fd // e8???????? | condition: 7 of them and filesize < 372736 }
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