Actor(s): TA410
Keylogger.
rule win_unidentified_096_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.unidentified_096." 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_096" 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 = { 8944240c ff15???????? 8bf0 a1???????? 3bf0 747b 8d4c2410 } // n = 7, score = 100 // 8944240c | mov dword ptr [esp + 0xc], eax // ff15???????? | // 8bf0 | mov esi, eax // a1???????? | // 3bf0 | cmp esi, eax // 747b | je 0x7d // 8d4c2410 | lea ecx, [esp + 0x10] $sequence_1 = { c3 84c0 7418 8b0d???????? } // n = 4, score = 100 // c3 | ret // 84c0 | test al, al // 7418 | je 0x1a // 8b0d???????? | $sequence_2 = { 48 0f8516040000 51 68???????? e8???????? 8b15???????? 83c408 } // n = 7, score = 100 // 48 | dec eax // 0f8516040000 | jne 0x41c // 51 | push ecx // 68???????? | // e8???????? | // 8b15???????? | // 83c408 | add esp, 8 $sequence_3 = { 6880000000 68???????? 56 8935???????? ff15???????? 8b54241c 8b44241a } // n = 7, score = 100 // 6880000000 | push 0x80 // 68???????? | // 56 | push esi // 8935???????? | // ff15???????? | // 8b54241c | mov edx, dword ptr [esp + 0x1c] // 8b44241a | mov eax, dword ptr [esp + 0x1a] $sequence_4 = { c21000 8d54240c 6a10 52 56 6803000010 } // n = 6, score = 100 // c21000 | ret 0x10 // 8d54240c | lea edx, [esp + 0xc] // 6a10 | push 0x10 // 52 | push edx // 56 | push esi // 6803000010 | push 0x10000003 $sequence_5 = { b02e eb02 b02f a2???????? } // n = 4, score = 100 // b02e | mov al, 0x2e // eb02 | jmp 4 // b02f | mov al, 0x2f // a2???????? | $sequence_6 = { 8d4c2408 6a01 51 66c74424100100 66c74424120600 c744241400010000 89742418 } // n = 7, score = 100 // 8d4c2408 | lea ecx, [esp + 8] // 6a01 | push 1 // 51 | push ecx // 66c74424100100 | mov word ptr [esp + 0x10], 1 // 66c74424120600 | mov word ptr [esp + 0x12], 6 // c744241400010000 | mov dword ptr [esp + 0x14], 0x100 // 89742418 | mov dword ptr [esp + 0x18], esi $sequence_7 = { 8ac1 7c02 0420 a2???????? 6683f960 7216 6683f969 } // n = 7, score = 100 // 8ac1 | mov al, cl // 7c02 | jl 4 // 0420 | add al, 0x20 // a2???????? | // 6683f960 | cmp cx, 0x60 // 7216 | jb 0x18 // 6683f969 | cmp cx, 0x69 $sequence_8 = { 83c296 83fa05 7725 ff2495cc164000 b02a eb15 b02b } // n = 7, score = 100 // 83c296 | add edx, -0x6a // 83fa05 | cmp edx, 5 // 7725 | ja 0x27 // ff2495cc164000 | jmp dword ptr [edx*4 + 0x4016cc] // b02a | mov al, 0x2a // eb15 | jmp 0x17 // b02b | mov al, 0x2b $sequence_9 = { 50 ffd3 55 55 8d4c2418 55 } // n = 6, score = 100 // 50 | push eax // ffd3 | call ebx // 55 | push ebp // 55 | push ebp // 8d4c2418 | lea ecx, [esp + 0x18] // 55 | push ebp condition: 7 of them and filesize < 25648 }
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