Actor(s): Turla Group
There is no description at this point.
rule win_newpass_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-04-08" version = "1" description = "Detects win.newpass." 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.newpass" malpedia_rule_date = "20220405" malpedia_hash = "ecd38294bd47d5589be5cd5490dc8bb4804afc2a" malpedia_version = "20220411" 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 = { eb9c 663902 41b901000000 450f42cd eb92 498bd6 4d3bca } // n = 7, score = 500 // eb9c | lea eax, dword ptr [0x6c5c7] // 663902 | jne 0x45a // 41b901000000 | dec eax // 450f42cd | mov dword ptr [esp + 0x50], eax // eb92 | dec eax // 498bd6 | mov ebx, ecx // 4d3bca | dec eax $sequence_1 = { 8803 48ffc3 48895c2448 e9???????? 483bdf 7561 488bc7 } // n = 7, score = 500 // 8803 | xor al, byte ptr [eax + ecx] // 48ffc3 | xor al, 0xcf // 48895c2448 | mov byte ptr [ecx], al // e9???????? | // 483bdf | inc edx // 7561 | dec eax // 488bc7 | inc ecx $sequence_2 = { 4c895d10 6644895d00 4883cbff 66443918 7505 4d8bc3 eb14 } // n = 7, score = 500 // 4c895d10 | je 0x53a // 6644895d00 | jmp 0x724 // 4883cbff | dec eax // 66443918 | lea ecx, dword ptr [0x3fb13] // 7505 | test al, al // 4d8bc3 | movzx edi, byte ptr [esp + 0x22] // eb14 | je 0x550 $sequence_3 = { 33c0 c3 488b4008 c3 48833d????????00 488d05f9510200 740f } // n = 7, score = 500 // 33c0 | inc eax // c3 | cmp edx, 0x21 // 488b4008 | jb 0x230 // c3 | dec eax // 48833d????????00 | // 488d05f9510200 | lea ebp, dword ptr [0x6ac2c] // 740f | dec ecx $sequence_4 = { e9???????? 41b901000000 4d8bc7 498bd6 498bcc e8???????? 85c0 } // n = 7, score = 500 // e9???????? | // 41b901000000 | mov ebx, dword ptr [ecx] // 4d8bc7 | dec eax // 498bd6 | lea edx, dword ptr [esp + 0x38] // 498bcc | dec eax // e8???????? | // 85c0 | sub esp, 0x20 $sequence_5 = { 5f c3 488b6c2438 89710c 897108 488b742440 48c70100000000 } // n = 7, score = 500 // 5f | test ecx, ecx // c3 | jne 0x4f6 // 488b6c2438 | test edx, edx // 89710c | je 0x515 // 897108 | dec eax // 488b742440 | lea eax, dword ptr [0x52b75] // 48c70100000000 | jmp 0x528 $sequence_6 = { ff15???????? 488d151bb50100 483305???????? 488bcb 488905???????? ff15???????? 488d1515b50100 } // n = 7, score = 500 // ff15???????? | // 488d151bb50100 | dec eax // 483305???????? | // 488bcb | sub edx, ebx // 488905???????? | // ff15???????? | // 488d1515b50100 | dec eax $sequence_7 = { c645b000 803800 7505 4c8bc6 eb16 4d8bc4 660f1f840000000000 } // n = 7, score = 500 // c645b000 | dec ecx // 803800 | or eax, 0xffffffff // 7505 | dec ecx // 4c8bc6 | inc eax // eb16 | inc ebp // 4d8bc4 | xor eax, eax // 660f1f840000000000 | dec esp $sequence_8 = { 488bc8 e8???????? 4c8bf8 48894587 41bd01000000 488b4d97 4885c9 } // n = 7, score = 500 // 488bc8 | sub esi, edx // e8???????? | // 4c8bf8 | cmp byte ptr [edx], 0 // 48894587 | jne 0x531 // 41bd01000000 | inc ecx // 488b4d97 | sub edx, eax // 4885c9 | xor eax, eax $sequence_9 = { 49b80026000001000000 0f110424 488b1424 0f1f8000000000 0fb602 3c20 770f } // n = 7, score = 500 // 49b80026000001000000 | dec eax // 0f110424 | lea edx, dword ptr [0x1619c] // 488b1424 | lea ecx, dword ptr [edi + 0xf] // 0f1f8000000000 | dec eax // 0fb602 | lea ebx, dword ptr [0x5192f] // 3c20 | dec eax // 770f | test eax, eax condition: 7 of them and filesize < 1286144 }
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