Actor(s): APT41
There is no description at this point.
rule win_lowkey_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-12-22" version = "1" description = "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.lowkey" malpedia_rule_date = "20201222" malpedia_hash = "30354d830a29f0fbd3714d93d94dea941d77a130" malpedia_version = "20201023" 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 660f1f840000000000 0fb601 88040a 488d4901 84c0 } // n = 6, score = 100 // 0f1f4000 | dec eax // 660f1f840000000000 | sar eax, 6 // 0fb601 | dec eax // 88040a | shl ecx, 6 // 488d4901 | dec eax // 84c0 | lea edx, [0x9b2a] $sequence_1 = { 498bc0 488b5c2430 4883c420 5f c3 488b4110 } // n = 6, score = 100 // 498bc0 | inc ecx // 488b5c2430 | cmp al, 0xd // 4883c420 | je 0x52 // 5f | inc ecx // c3 | cmp al, 0x20 // 488b4110 | je 0x52 $sequence_2 = { 807c246c2e 0f84f2000000 4c8d4c246c 4c8bc3 488d15a3280200 488d8da0020000 e8???????? } // n = 7, score = 100 // 807c246c2e | mov dword ptr [ebx], ecx // 0f84f2000000 | dec eax // 4c8d4c246c | lea edx, [ebx + 8] // 4c8bc3 | xor ecx, ecx // 488d15a3280200 | dec eax // 488d8da0020000 | sub esp, 0x20 // e8???????? | $sequence_3 = { 4c89ac24a8470000 458d6e66 660f1f440000 41b910000000 4c8d442438 e8???????? 85c0 } // n = 7, score = 100 // 4c89ac24a8470000 | sub esp, 0x20 // 458d6e66 | jmp 0xebe // 660f1f440000 | dec eax // 41b910000000 | lea eax, [0x3f197] // 4c8d442438 | dec ebx // e8???????? | // 85c0 | dec eax $sequence_4 = { 33db 8bfa 488bf1 85d2 7e38 660f1f440000 } // n = 6, score = 100 // 33db | dec eax // 8bfa | lea ecx, [ebp + 0x30] // 488bf1 | dec esp // 85d2 | mov eax, dword ptr [ebp - 0x70] // 7e38 | dec eax // 660f1f440000 | mov dword ptr [esp + 0x28], eax $sequence_5 = { 8bda 488b4910 e8???????? 488d4f50 ff15???????? 488d4f28 ff15???????? } // n = 7, score = 100 // 8bda | jne 0x849 // 488b4910 | dec eax // e8???????? | // 488d4f50 | xor eax, esp // ff15???????? | // 488d4f28 | dec eax // ff15???????? | $sequence_6 = { 4a8794f1209b0400 eb2d 4c8b05???????? ebb1 b940000000 } // n = 5, score = 100 // 4a8794f1209b0400 | mov dword ptr [esp + 8], ebx // eb2d | dec eax // 4c8b05???????? | // ebb1 | mov dword ptr [esp + 0x10], edi // b940000000 | dec eax $sequence_7 = { 488d15669b0000 e8???????? 488bf8 4885c0 740f } // n = 5, score = 100 // 488d15669b0000 | dec eax // e8???????? | // 488bf8 | mov ecx, ebx // 4885c0 | test eax, eax // 740f | inc ecx $sequence_8 = { 4c89ac24c0210000 ff15???????? 488b4b10 e8???????? 448be8 4183fe04 } // n = 6, score = 100 // 4c89ac24c0210000 | mov eax, 0x100 // ff15???????? | // 488b4b10 | dec eax // e8???????? | // 448be8 | test ebx, ebx // 4183fe04 | jne 0x28f $sequence_9 = { 480f45442478 488d4d30 4c8b4590 4889442428 8b45c0 } // n = 5, score = 100 // 480f45442478 | je 0x15d4 // 488d4d30 | jmp 0x1418 // 4c8b4590 | test eax, eax // 4889442428 | je 0x15fd // 8b45c0 | movzx eax, word ptr [esp + 0x65] condition: 7 of them and filesize < 643072 }
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