Actor(s): APT 29
There is no description at this point.
rule win_ati_agent_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.ati_agent." 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.ati_agent" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 0f1f4000 0fb6040a 342e 6633c1 48ffc1 } // n = 5, score = 100 // 0f1f4000 | inc ecx // 0fb6040a | mov ecx, 3 // 342e | dec ecx // 6633c1 | sar esp, 5 // 48ffc1 | dec esp $sequence_1 = { 4c8d0d6286ffff 498bc9 e8???????? 85c0 7422 4d2bc1 } // n = 6, score = 100 // 4c8d0d6286ffff | mov ecx, 0x20119 // 498bc9 | inc ebp // e8???????? | // 85c0 | xor eax, eax // 7422 | dec eax // 4d2bc1 | mov ecx, 0x80000001 $sequence_2 = { 6689844cee000000 4883f90a 72e2 488d442458 488d942410010000 } // n = 5, score = 100 // 6689844cee000000 | arpl cx, bx // 4883f90a | dec eax // 72e2 | lea ebp, [0xdf23] // 488d442458 | dec eax // 488d942410010000 | mov edi, ebx $sequence_3 = { e9???????? 48890d???????? c3 4883ec28 4c8bc1 4c8d0d6286ffff } // n = 6, score = 100 // e9???????? | // 48890d???????? | // c3 | inc ecx // 4883ec28 | mov esp, 0x314 // 4c8bc1 | dec esp // 4c8d0d6286ffff | lea eax, [0x5a64] $sequence_4 = { cc 4883ec28 85c9 7820 83f902 } // n = 5, score = 100 // cc | sub esp, 0x88 // 4883ec28 | dec eax // 85c9 | lea ecx, [0xd5c9] // 7820 | dec eax // 83f902 | mov dword ptr [esp + 0x40], ecx $sequence_5 = { e8???????? 85c0 7408 8bcb ff15???????? e8???????? 488d15ae630000 } // n = 7, score = 100 // e8???????? | // 85c0 | dec ebx // 7408 | mov esi, dword ptr [esi] // 8bcb | mov edi, 1 // ff15???????? | // e8???????? | // 488d15ae630000 | cmp dword ptr [ebx + esi + 0xc], 0 $sequence_6 = { 488b4c2438 4833cc e8???????? 4883c448 c3 4c8b05???????? 32c9 } // n = 7, score = 100 // 488b4c2438 | sar eax, 5 // 4833cc | jae 0x238 // e8???????? | // 4883c448 | dec eax // c3 | arpl cx, bx // 4c8b05???????? | // 32c9 | dec eax $sequence_7 = { 4863d9 4c8be3 49c1fc05 4c8d3572e10000 83e31f 486bdb58 4b8b34e6 } // n = 7, score = 100 // 4863d9 | mov edx, ebx // 4c8be3 | dec eax // 49c1fc05 | mov eax, 0xaaaaaaab // 4c8d3572e10000 | stosb byte ptr es:[edi], al // 83e31f | stosb byte ptr es:[edi], al // 486bdb58 | stosb byte ptr es:[edi], al // 4b8b34e6 | sub dh, byte ptr [edx - 0x1e] $sequence_8 = { e8???????? ebc9 488bcb 488bc3 488d156ba30000 48c1f805 } // n = 6, score = 100 // e8???????? | // ebc9 | and ebx, 0x1f // 488bcb | dec eax // 488bc3 | sar edi, 5 // 488d156ba30000 | dec eax // 48c1f805 | imul ebx, ebx, 0x58 $sequence_9 = { 4883d8ff c3 483bca 732d } // n = 4, score = 100 // 4883d8ff | dec eax // c3 | mov dword ptr [esp + 0x7d0], ebx // 483bca | mov dword ptr [esp + 0x50], 0x618 // 732d | inc ebp condition: 7 of them and filesize < 172032 }
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