Actor(s): APT29, Turla Group
There is no description at this point.
rule win_newpass_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 8d4801 e8???????? 4c8b542458 498902 8b0b c6040100 803d????????00 } // n = 7, score = 700 // 8d4801 | dec ebp // e8???????? | // 4c8b542458 | lea ecx, [ecx + 1] // 498902 | dec ecx // 8b0b | mov edx, dword ptr [esi + 8] // c6040100 | dec ecx // 803d????????00 | $sequence_1 = { ba14000000 498bcf ff15???????? 85c0 0f8427ffffff eb38 488b5758 } // n = 7, score = 700 // ba14000000 | dec eax // 498bcf | xor eax, esp // ff15???????? | // 85c0 | dec eax // 0f8427ffffff | mov dword ptr [ebp - 9], eax // eb38 | dec ebp // 488b5758 | mov ebp, ecx $sequence_2 = { 0f95c0 85c0 0f94c0 84c0 7515 4183c702 4883c340 } // n = 7, score = 700 // 0f95c0 | lea ecx, [ebp - 0x59] // 85c0 | nop // 0f94c0 | dec eax // 84c0 | cmp dword ptr [ebp + 0x2f], 8 // 7515 | jb 0xa01 // 4183c702 | dec eax // 4883c340 | mov ecx, dword ptr [ebp + 0x17] $sequence_3 = { 4d8bc4 eb0d 4983c8ff 49ffc0 47382401 75f7 } // n = 6, score = 700 // 4d8bc4 | cmp dword ptr [esp + 0x50], 0x10 // eb0d | jb 0x1e32 // 4983c8ff | inc ecx // 49ffc0 | test bh, 1 // 47382401 | je 0x1e49 // 75f7 | inc ecx $sequence_4 = { c60700 498bc6 488b8c24b0000000 4833cc e8???????? 488b9c2410010000 4881c4c0000000 } // n = 7, score = 700 // c60700 | dec eax // 498bc6 | cmp esi, ebx // 488b8c24b0000000 | setne al // 4833cc | test eax, eax // e8???????? | // 488b9c2410010000 | sete bl // 4881c4c0000000 | dec ecx $sequence_5 = { 48837dc810 480f4355b0 4889742420 4c8d4c2430 448bc3 488b8dd0100000 } // n = 6, score = 700 // 48837dc810 | lea edx, [0x8429a] // 480f4355b0 | mov ecx, 0x35 // 4889742420 | jmp 0x930 // 4c8d4c2430 | jne 0x93e // 448bc3 | dec eax // 488b8dd0100000 | lea edx, [0x84e9a] $sequence_6 = { 7447 493bdd 742c 48837b1810 7208 488b0b e8???????? } // n = 7, score = 700 // 7447 | dec eax // 493bdd | cmp dword ptr [ebx + 0x18], 0x10 // 742c | jb 0x1574 // 48837b1810 | dec eax // 7208 | mov ecx, dword ptr [ebx] // 488b0b | dec esp // e8???????? | $sequence_7 = { b001 488b4c2468 4833cc e8???????? 488b9c24a0000000 4883c470 } // n = 6, score = 700 // b001 | jmp 0x1a9 // 488b4c2468 | dec eax // 4833cc | mov eax, edi // e8???????? | // 488b9c24a0000000 | dec eax // 4883c470 | mov dword ptr [ebp - 0x40], eax $sequence_8 = { 837e3000 0f8534010000 0fb603 3c30 7c25 ebc3 488bc3 } // n = 7, score = 700 // 837e3000 | inc ecx // 0f8534010000 | dec eax // 0fb603 | inc edx // 3c30 | cmp ecx, 0xd // 7c25 | jb 0x1840 // ebc3 | inc ecx // 488bc3 | xor al, byte ptr [eax + edx] $sequence_9 = { 740c 3c0a 7408 3c0d 7404 3c09 7505 } // n = 7, score = 700 // 740c | inc eax // 3c0a | inc ecx // 7408 | xor al, byte ptr [eax + edx] // 3c0d | xor al, 0x26 // 7404 | mov byte ptr [edx], al // 3c09 | dec eax // 7505 | or eax, 0xffffff00 condition: 7 of them and filesize < 2654208 }
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