Actor(s): Anunak
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rule win_klrd_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-01-25" version = "1" description = "Detects win.klrd." 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.klrd" 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 = { ff75f0 ff75ec ff15???????? 8985d4feffff 83bdd4feffff00 7502 } // n = 6, score = 100 // ff75f0 | push dword ptr [ebp - 0x10] // ff75ec | push dword ptr [ebp - 0x14] // ff15???????? | // 8985d4feffff | mov dword ptr [ebp - 0x12c], eax // 83bdd4feffff00 | cmp dword ptr [ebp - 0x12c], 0 // 7502 | jne 4 $sequence_1 = { 50 ff15???????? c9 c3 8b45fc } // n = 5, score = 100 // 50 | push eax // ff15???????? | // c9 | leave // c3 | ret // 8b45fc | mov eax, dword ptr [ebp - 4] $sequence_2 = { 740d 817d0c00010000 0f85a6020000 8b7510 6a05 59 8d7dec } // n = 7, score = 100 // 740d | je 0xf // 817d0c00010000 | cmp dword ptr [ebp + 0xc], 0x100 // 0f85a6020000 | jne 0x2ac // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 6a05 | push 5 // 59 | pop ecx // 8d7dec | lea edi, [ebp - 0x14] $sequence_3 = { e8???????? ff35???????? ff15???????? 53 ebd2 } // n = 5, score = 100 // e8???????? | // ff35???????? | // ff15???????? | // 53 | push ebx // ebd2 | jmp 0xffffffd4 $sequence_4 = { 59 ff7510 ff750c ff7508 ff35???????? ff15???????? 5f } // n = 7, score = 100 // 59 | pop ecx // ff7510 | push dword ptr [ebp + 0x10] // ff750c | push dword ptr [ebp + 0xc] // ff7508 | push dword ptr [ebp + 8] // ff35???????? | // ff15???????? | // 5f | pop edi $sequence_5 = { 80bdacfcffff1b 741b 80bdacfcffff20 7432 eb57 68???????? e8???????? } // n = 7, score = 100 // 80bdacfcffff1b | cmp byte ptr [ebp - 0x354], 0x1b // 741b | je 0x1d // 80bdacfcffff20 | cmp byte ptr [ebp - 0x354], 0x20 // 7432 | je 0x34 // eb57 | jmp 0x59 // 68???????? | // e8???????? | $sequence_6 = { b804100000 e8???????? 56 57 8d450c } // n = 5, score = 100 // b804100000 | mov eax, 0x1004 // e8???????? | // 56 | push esi // 57 | push edi // 8d450c | lea eax, [ebp + 0xc] $sequence_7 = { 53 50 889dfcfeffff e8???????? 83c40c 53 ff15???????? } // n = 7, score = 100 // 53 | push ebx // 50 | push eax // 889dfcfeffff | mov byte ptr [ebp - 0x104], bl // e8???????? | // 83c40c | add esp, 0xc // 53 | push ebx // ff15???????? | $sequence_8 = { 8d85fcfeffff 50 53 ff15???????? 8b35???????? } // n = 5, score = 100 // 8d85fcfeffff | lea eax, [ebp - 0x104] // 50 | push eax // 53 | push ebx // ff15???????? | // 8b35???????? | $sequence_9 = { 8d45fc 50 8d85fcefffff 50 e8???????? } // n = 5, score = 100 // 8d45fc | lea eax, [ebp - 4] // 50 | push eax // 8d85fcefffff | lea eax, [ebp - 0x1004] // 50 | push eax // e8???????? | condition: 7 of them and filesize < 40960 }
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