Actor(s): Kimsuki, Kimsuky
There is no description at this point.
rule win_kimsuky_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2024-10-31" version = "1" description = "Detects win.kimsuky." 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.kimsuky" malpedia_rule_date = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 83c418 8d85f8feffff 6a00 50 } // n = 4, score = 400 // 83c418 | add esp, 0x18 // 8d85f8feffff | lea eax, [ebp - 0x108] // 6a00 | push 0 // 50 | push eax $sequence_1 = { 6a00 e8???????? 83c418 50 ff15???????? 8b4dfc } // n = 6, score = 400 // 6a00 | push 0 // e8???????? | // 83c418 | add esp, 0x18 // 50 | push eax // ff15???????? | // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_2 = { a1???????? 33c5 8945fc 833d????????00 7413 } // n = 5, score = 400 // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 833d????????00 | // 7413 | je 0x15 $sequence_3 = { 740a 33ff ff15???????? eb06 ff15???????? } // n = 5, score = 400 // 740a | je 0xc // 33ff | xor edi, edi // ff15???????? | // eb06 | jmp 8 // ff15???????? | $sequence_4 = { 6a00 8d85e8fdffff 50 8d85f0feffff 50 ff15???????? 85c0 } // n = 7, score = 400 // 6a00 | push 0 // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax // ff15???????? | // 85c0 | test eax, eax $sequence_5 = { 75f9 2bca 51 8d85e4f5ffff 50 6a00 } // n = 6, score = 400 // 75f9 | jne 0xfffffffb // 2bca | sub ecx, edx // 51 | push ecx // 8d85e4f5ffff | lea eax, [ebp - 0xa1c] // 50 | push eax // 6a00 | push 0 $sequence_6 = { ff15???????? 85c0 7516 ff15???????? 8bd8 e8???????? 0fafd8 } // n = 7, score = 400 // ff15???????? | // 85c0 | test eax, eax // 7516 | jne 0x18 // ff15???????? | // 8bd8 | mov ebx, eax // e8???????? | // 0fafd8 | imul ebx, eax $sequence_7 = { a3???????? 8d85dcf7ffff 50 53 ffd7 a3???????? } // n = 6, score = 400 // a3???????? | // 8d85dcf7ffff | lea eax, [ebp - 0x824] // 50 | push eax // 53 | push ebx // ffd7 | call edi // a3???????? | $sequence_8 = { 83c430 8d95f0fcffff b9???????? e8???????? 8d95ecfbffff b9???????? } // n = 6, score = 400 // 83c430 | add esp, 0x30 // 8d95f0fcffff | lea edx, [ebp - 0x310] // b9???????? | // e8???????? | // 8d95ecfbffff | lea edx, [ebp - 0x414] // b9???????? | $sequence_9 = { 4889742438 4533ff 4c89642428 4c896c2420 33f6 } // n = 5, score = 300 // 4889742438 | xor eax, eax // 4533ff | dec ecx // 4c89642428 | mov ecx, esi // 4c896c2420 | inc ecx // 33f6 | lea edx, [eax + 1] $sequence_10 = { ebdb 65488b042560000000 48897c2430 48896c2460 } // n = 4, score = 300 // ebdb | xor eax, eax // 65488b042560000000 | xor edx, edx // 48897c2430 | dec eax // 48896c2460 | or ecx, 0xffffffff $sequence_11 = { 4533ed 4533e4 4c897c2468 e8???????? 488be8 b84d5a0000 0f1f440000 } // n = 7, score = 300 // 4533ed | dec ebp // 4533e4 | add ebx, ecx // 4c897c2468 | nop word ptr [eax + eax] // e8???????? | // 488be8 | inc ecx // b84d5a0000 | mov ecx, dword ptr [edx] // 0f1f440000 | jmp 0xffffffdd $sequence_12 = { 33d2 4883c9ff 4903de ff542468 4533c0 498bce 418d5001 } // n = 7, score = 300 // 33d2 | xor edx, edx // 4883c9ff | dec eax // 4903de | or ecx, 0xffffffff // ff542468 | dec ecx // 4533c0 | add ebx, esi // 498bce | call dword ptr [esp + 0x68] // 418d5001 | inc ebp $sequence_13 = { 468b540f20 468b5c0f24 4d03d1 4d03d9 666666660f1f840000000000 418b0a } // n = 6, score = 300 // 468b540f20 | dec eax // 468b5c0f24 | mov ebp, dword ptr [esp + 0x60] // 4d03d1 | dec esp // 4d03d9 | arpl word ptr [ebp + 0x3c], di // 666666660f1f840000000000 | xor ecx, ecx // 418b0a | inc ebp $sequence_14 = { 4533c0 498bce 418d5001 ffd3 488bc3 4883c440 415f } // n = 7, score = 300 // 4533c0 | dec ecx // 498bce | add ebx, esi // 418d5001 | call dword ptr [esp + 0x68] // ffd3 | inc ebp // 488bc3 | xor eax, eax // 4883c440 | inc esi // 415f | mov edx, dword ptr [edi + ecx + 0x20] $sequence_15 = { 0f8540feffff 488b6c2460 4c637d3c 33c9 } // n = 4, score = 300 // 0f8540feffff | dec eax // 488b6c2460 | mov dword ptr [esp + 0x38], esi // 4c637d3c | inc ebp // 33c9 | xor edi, edi $sequence_16 = { 4c89642430 c744242880000000 c744242002000000 4533c9 4533c0 } // n = 5, score = 200 // 4c89642430 | mov esi, dword ptr [ebp - 0x70] // c744242880000000 | nop word ptr [eax + eax] // c744242002000000 | cmp dword ptr [ebp - 0x10], 0 // 4533c9 | mov ecx, edi // 4533c0 | test eax, eax $sequence_17 = { 898521010000 66898525010000 888527010000 8b742450 } // n = 4, score = 200 // 898521010000 | arpl word ptr [ebp + 0x3c], di // 66898525010000 | xor ecx, ecx // 888527010000 | inc ecx // 8b742450 | mov eax, 0x3000 $sequence_18 = { 8bbda0010000 8d4702 03c2 89442450 } // n = 4, score = 200 // 8bbda0010000 | mov dword ptr [esp + 0x30], edi // 8d4702 | dec eax // 03c2 | mov dword ptr [esp + 0x60], ebp // 89442450 | inc ebp $sequence_19 = { 894d90 8bc1 81fb00000001 0f97c0 } // n = 4, score = 200 // 894d90 | inc ebp // 8bc1 | xor esp, esp // 81fb00000001 | dec esp // 0f97c0 | mov dword ptr [esp + 0x68], edi $sequence_20 = { 83f809 8d7340 7405 be20000000 c68424a000000000 33d2 } // n = 6, score = 200 // 83f809 | add edx, ecx // 8d7340 | dec ebp // 7405 | add ebx, ecx // be20000000 | nop word ptr [eax + eax] // c68424a000000000 | inc ecx // 33d2 | mov ecx, dword ptr [edx] $sequence_21 = { 8bd7 3bd8 0f94c2 85d2 7419 } // n = 5, score = 200 // 8bd7 | mov ebx, eax // 3bd8 | imul ebx, eax // 0f94c2 | test eax, eax // 85d2 | jne 0x18 // 7419 | mov ebx, eax $sequence_22 = { 488d8a38000000 e9???????? 488d8a28010000 e9???????? } // n = 4, score = 200 // 488d8a38000000 | mov dword ptr [ebp + 0xa0], edi // e9???????? | // 488d8a28010000 | mov edx, edi // e9???????? | $sequence_23 = { 85c0 0f8432020000 8b7590 660f1f440000 } // n = 4, score = 200 // 85c0 | dec ecx // 0f8432020000 | mov ecx, esi // 8b7590 | inc ebp // 660f1f440000 | xor ebp, ebp $sequence_24 = { 85c0 0f94c1 85c9 0f8494020000 89bda0000000 897d30 33c0 } // n = 7, score = 200 // 85c0 | inc ebp // 0f94c1 | xor eax, eax // 85c9 | inc esi // 0f8494020000 | mov edx, dword ptr [edi + ecx + 0x20] // 89bda0000000 | inc esi // 897d30 | mov ebx, dword ptr [edi + ecx + 0x24] // 33c0 | dec ebp $sequence_25 = { 6690 6644396102 488d4902 75f5 } // n = 4, score = 100 // 6690 | mov dword ptr [esp + 0x28], esp // 6644396102 | dec esp // 488d4902 | mov dword ptr [esp + 0x20], ebp // 75f5 | xor esi, esi $sequence_26 = { 66c1e908 880c02 ff07 448b0f } // n = 4, score = 100 // 66c1e908 | dec eax // 880c02 | lea ecx, [esp + 0x50] // ff07 | nop // 448b0f | dec ecx $sequence_27 = { 6690 8bd7 4d8d45f0 83ff10 } // n = 4, score = 100 // 6690 | dec eax // 8bd7 | lea ecx, [edx + 0x128] // 4d8d45f0 | dec eax // 83ff10 | lea ecx, [edx + 0x38] $sequence_28 = { 6690 49ffc0 6642833c4000 75f5 488d95ac020000 } // n = 5, score = 100 // 6690 | mov ebx, eax // 49ffc0 | imul ebx, eax // 6642833c4000 | mov ebx, eax // 75f5 | imul ebx, eax // 488d95ac020000 | jne 0x18 $sequence_29 = { 6690 6644396202 488d5202 75f5 } // n = 4, score = 100 // 6690 | mov eax, ebx // 6644396202 | dec eax // 488d5202 | add esp, 0x40 // 75f5 | dec ecx $sequence_30 = { 6690 49ffc0 6642392c42 75f6 } // n = 4, score = 100 // 6690 | mov ecx, edi // 49ffc0 | test eax, eax // 6642392c42 | sete cl // 75f6 | test ecx, ecx condition: 7 of them and filesize < 1021952 }
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