Actor(s): APT-Q-12
There is no description at this point.
rule win_unidentified_100_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 488d9424f0030000 488b4c2448 e8???????? e9???????? 4c8d8c2490070000 4533c0 488d942470130000 } // n = 7, score = 100 // 488d9424f0030000 | lea edx, [0x9759] // 488b4c2448 | dec eax // e8???????? | // e9???????? | // 4c8d8c2490070000 | test eax, eax // 4533c0 | je 0x1b6f // 488d942470130000 | mov ecx, 0x22 $sequence_1 = { 4889442420 4c8d8c24e0020000 448b442458 8b54245c 8b4c2454 } // n = 5, score = 100 // 4889442420 | add ecx, ecx // 4c8d8c24e0020000 | dec eax // 448b442458 | arpl cx, cx // 8b54245c | mov byte ptr [esp + ecx + 0x78], al // 8b4c2454 | mov eax, dword ptr [esp + 0x34] $sequence_2 = { 0f8dac000000 c644242000 eb0b 0fb6442420 fec0 88442420 0fb6442420 } // n = 7, score = 100 // 0f8dac000000 | lea ebx, [0x1d5e7] // c644242000 | dec eax // eb0b | lea edi, [0x1d5e0] // 0fb6442420 | jmp 0x1c5a // fec0 | dec eax // 88442420 | mov eax, dword ptr [ebx] // 0fb6442420 | dec eax $sequence_3 = { 448bc3 488d1580860000 e8???????? 85c0 7429 } // n = 5, score = 100 // 448bc3 | dec eax // 488d1580860000 | lea ecx, [0xf1b7] // e8???????? | // 85c0 | dec eax // 7429 | lea ebx, [0x19517] $sequence_4 = { 488bf8 33c0 b9fe010000 f3aa 4c8b8c24b8060000 4c8b8424b0060000 488d156dfd0100 } // n = 7, score = 100 // 488bf8 | dec eax // 33c0 | mov dword ptr [esp + 0x80], edx // b9fe010000 | mov dword ptr [esp + 0x38], eax // f3aa | dec eax // 4c8b8c24b8060000 | mov edi, eax // 4c8b8424b0060000 | movzx ecx, byte ptr [edx + eax*4 + 0x1e522] // 488d156dfd0100 | movzx esi, byte ptr [edx + eax*4 + 0x1e523] $sequence_5 = { eb1d 488d05a7690100 ffcb 488d0c9b 488d0cc8 ff15???????? ff0d???????? } // n = 7, score = 100 // eb1d | lea ecx, [0x1fbdd] // 488d05a7690100 | dec eax // ffcb | xor eax, esp // 488d0c9b | dec eax // 488d0cc8 | mov dword ptr [esp + 0x420], eax // ff15???????? | // ff0d???????? | $sequence_6 = { 488d05a7690100 ffcb 488d0c9b 488d0cc8 ff15???????? } // n = 5, score = 100 // 488d05a7690100 | dec eax // ffcb | arpl word ptr [esp], ax // 488d0c9b | dec eax // 488d0cc8 | mov ecx, dword ptr [esp + 0x30] // ff15???????? | $sequence_7 = { ffc0 8944243c 486344243c 483b442458 7320 486344243c } // n = 6, score = 100 // ffc0 | dec eax // 8944243c | mov dword ptr [ebp - 9], ebx // 486344243c | dec esp // 483b442458 | mov esp, ebx // 7320 | dec esp // 486344243c | mov dword ptr [ebp - 0x49], ebp $sequence_8 = { 33c0 b97a010000 f3aa 488d8424b0190000 488d0deee80100 } // n = 5, score = 100 // 33c0 | mov ecx, 0xa6 // b97a010000 | rep stosb byte ptr es:[edi], al // f3aa | dec eax // 488d8424b0190000 | lea eax, [esp + 0x6e0] // 488d0deee80100 | dec eax $sequence_9 = { 488b842490030000 4889842490000000 48c7442458ffffffff 48ff442458 488b842490000000 488b4c2458 66833c4800 } // n = 7, score = 100 // 488b842490030000 | cmp eax, 1 // 4889842490000000 | je 0x1d22 // 48c7442458ffffffff | dec eax // 48ff442458 | lea ecx, [esp + 0x140] // 488b842490000000 | mov dword ptr [esp + 0x50], eax // 488b4c2458 | cmp dword ptr [esp + 0x50], -1 // 66833c4800 | cmp eax, 1 condition: 7 of them and filesize < 372736 }
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