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 = "2026-05-04" 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 = "20260422" malpedia_hash = "a182e35da64e6d71cb55f125c4d4225196523f14" malpedia_version = "20260504" 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 = { ff15???????? 3db7000000 7503 56 eb18 6a00 6a00 } // n = 7, score = 400 // ff15???????? | // 3db7000000 | cmp eax, 0xb7 // 7503 | jne 5 // 56 | push esi // eb18 | jmp 0x1a // 6a00 | push 0 // 6a00 | push 0 $sequence_1 = { 8d85f0feffff 50 68???????? ff15???????? 6a04 6a00 } // n = 6, score = 400 // 8d85f0feffff | lea eax, [ebp - 0x110] // 50 | push eax // 68???????? | // ff15???????? | // 6a04 | push 4 // 6a00 | push 0 $sequence_2 = { 56 85ff 740a 33ff } // n = 4, score = 400 // 56 | push esi // 85ff | test edi, edi // 740a | je 0xc // 33ff | xor edi, edi $sequence_3 = { ffd7 a3???????? 8d85ecfbffff 50 53 ffd7 } // n = 6, score = 400 // ffd7 | call edi // a3???????? | // 8d85ecfbffff | lea eax, [ebp - 0x414] // 50 | push eax // 53 | push ebx // ffd7 | call edi $sequence_4 = { 7516 ff15???????? 8bd8 e8???????? 0fafd8 } // n = 5, score = 400 // 7516 | jne 0x18 // ff15???????? | // 8bd8 | mov ebx, eax // e8???????? | // 0fafd8 | imul ebx, eax $sequence_5 = { 50 8d85f8feffff 50 8d85f4fdffff 68???????? 50 e8???????? } // n = 7, score = 400 // 50 | push eax // 8d85f8feffff | lea eax, [ebp - 0x108] // 50 | push eax // 8d85f4fdffff | lea eax, [ebp - 0x20c] // 68???????? | // 50 | push eax // e8???????? | $sequence_6 = { 6a00 68???????? ff15???????? 6a00 8d85e8fdffff 50 } // n = 6, score = 400 // 6a00 | push 0 // 68???????? | // ff15???????? | // 6a00 | push 0 // 8d85e8fdffff | lea eax, [ebp - 0x218] // 50 | push eax $sequence_7 = { 56 ffd7 a3???????? 8d85ccf3ffff 50 56 } // n = 6, score = 400 // 56 | push esi // ffd7 | call edi // a3???????? | // 8d85ccf3ffff | lea eax, [ebp - 0xc34] // 50 | push eax // 56 | push esi $sequence_8 = { ffd6 8bd8 85db 7510 5e 5b 8b4dfc } // n = 7, score = 400 // ffd6 | call esi // 8bd8 | mov ebx, eax // 85db | test ebx, ebx // 7510 | jne 0x12 // 5e | pop esi // 5b | pop ebx // 8b4dfc | mov ecx, dword ptr [ebp - 4] $sequence_9 = { 4c897c2468 41bb01000000 418d5b02 4d85ed } // n = 4, score = 300 // 4c897c2468 | dec ebp // 41bb01000000 | test eax, eax // 418d5b02 | dec esp // 4d85ed | mov ebp, dword ptr [esp + 0x20] $sequence_10 = { 4c897c2460 ffd6 458b4754 488bd5 4c8bf0 4d85c0 } // n = 6, score = 300 // 4c897c2460 | mov ebp, dword ptr [esp + 0x70] // ffd6 | dec ebp // 458b4754 | mov eax, esi // 488bd5 | dec ebp // 4c8bf0 | add edx, ecx // 4d85c0 | dec ebp $sequence_11 = { 4889742438 4533ff 4c89642428 4c896c2420 33f6 4533ed 4533e4 } // n = 7, score = 300 // 4889742438 | dec esp // 4533ff | mov esp, dword ptr [esp + 0x28] // 4c89642428 | dec eax // 4c896c2420 | mov edi, dword ptr [esp + 0x30] // 33f6 | dec eax // 4533ed | mov esi, dword ptr [esp + 0x38] // 4533e4 | dec eax $sequence_12 = { 4d8b36 4d85f6 0f8540feffff 488b6c2460 4c637d3c 33c9 } // n = 6, score = 300 // 4d8b36 | inc ebp // 4d85f6 | mov eax, dword ptr [edi + 0x54] // 0f8540feffff | dec eax // 488b6c2460 | mov edx, ebp // 4c637d3c | dec esp // 33c9 | mov esi, eax $sequence_13 = { 488b6c2470 4d8bc6 4d2b4730 4183bfb400000000 } // n = 4, score = 300 // 488b6c2470 | sub eax, dword ptr [edi + 0x30] // 4d8bc6 | dec ebp // 4d2b4730 | mov esi, dword ptr [esi] // 4183bfb400000000 | dec ebp $sequence_14 = { 4c8b7c2460 4c8b6c2420 4c8b642428 488b7c2430 488b742438 488b6c2470 4d8bc6 } // n = 7, score = 300 // 4c8b7c2460 | dec esp // 4c8b6c2420 | mov edi, dword ptr [esp + 0x60] // 4c8b642428 | dec esp // 488b7c2430 | mov ebp, dword ptr [esp + 0x20] // 488b742438 | dec esp // 488b6c2470 | mov esp, dword ptr [esp + 0x28] // 4d8bc6 | dec eax $sequence_15 = { 4d03d1 4d03d9 666666660f1f840000000000 418b0a } // n = 4, score = 300 // 4d03d1 | mov edi, dword ptr [esp + 0x30] // 4d03d9 | dec eax // 666666660f1f840000000000 | mov esi, dword ptr [esp + 0x38] // 418b0a | dec eax $sequence_16 = { 488d8a38000000 e9???????? 488d8a28010000 e9???????? } // n = 4, score = 200 // 488d8a38000000 | dec ebp // e9???????? | // 488d8a28010000 | sub eax, dword ptr [edi + 0x30] // e9???????? | $sequence_17 = { 8bd7 3bd8 0f94c2 85d2 7419 } // n = 5, score = 200 // 8bd7 | imul ebx, eax // 3bd8 | test eax, eax // 0f94c2 | jne 0x1a // 85d2 | mov ebx, eax // 7419 | test eax, eax $sequence_18 = { 894d90 8bc1 81fb00000001 0f97c0 } // n = 4, score = 200 // 894d90 | lea edx, [eax + 1] // 8bc1 | call ebx // 81fb00000001 | dec eax // 0f97c0 | mov eax, ebx $sequence_19 = { 4c89642430 c744242880000000 c744242002000000 4533c9 4533c0 ba00000040 } // n = 6, score = 200 // 4c89642430 | jne 0xfffffe49 // c744242880000000 | dec eax // c744242002000000 | mov ebp, dword ptr [esp + 0x60] // 4533c9 | dec esp // 4533c0 | arpl word ptr [ebp + 0x3c], di // ba00000040 | xor ecx, ecx $sequence_20 = { 8b7590 660f1f440000 837df000 0f841b020000 } // n = 4, score = 200 // 8b7590 | test ecx, ecx // 660f1f440000 | je 0x29c // 837df000 | mov dword ptr [ebp + 0xa0], edi // 0f841b020000 | mov dword ptr [ebp + 0x30], edi $sequence_21 = { 83f809 8d7340 7405 be20000000 c68424a000000000 33d2 } // n = 6, score = 200 // 83f809 | dec ebp // 8d7340 | add ebx, ecx // 7405 | nop word ptr [eax + eax] // be20000000 | inc ecx // c68424a000000000 | mov ecx, dword ptr [edx] // 33d2 | dec ecx $sequence_22 = { 8b442468 6683f809 7508 83f809 } // n = 4, score = 200 // 8b442468 | mov dword ptr [ebp + 0xa0], edi // 6683f809 | mov dword ptr [ebp + 0x30], edi // 7508 | test eax, eax // 83f809 | sete cl $sequence_23 = { 898521010000 66898525010000 888527010000 8b742450 } // n = 4, score = 200 // 898521010000 | je 0x29f // 66898525010000 | mov ecx, edi // 888527010000 | test eax, eax // 8b742450 | sete cl $sequence_24 = { 85c0 0f94c1 85c9 0f8494020000 89bda0000000 897d30 } // n = 6, score = 200 // 85c0 | dec eax // 0f94c1 | mov ebp, dword ptr [esp + 0x60] // 85c9 | dec esp // 0f8494020000 | arpl word ptr [ebp + 0x3c], di // 89bda0000000 | xor ecx, ecx // 897d30 | dec eax $sequence_25 = { 488dac24d0c1ffff b8303f0000 e8???????? 482be0 } // n = 4, score = 100 // 488dac24d0c1ffff | test eax, eax // b8303f0000 | jne 0x1a // e8???????? | // 482be0 | mov ebx, eax $sequence_26 = { 488dac24c0fdffff 4881ec40030000 488b05???????? 4833c4 48898530020000 488bf1 } // n = 6, score = 100 // 488dac24c0fdffff | lea edx, [eax + 1] // 4881ec40030000 | call ebx // 488b05???????? | // 4833c4 | dec eax // 48898530020000 | mov eax, ebx // 488bf1 | dec eax $sequence_27 = { 488dac24d0fbffff 4881ec30050000 488b05???????? 4833c4 48898520040000 488bf9 } // n = 6, score = 100 // 488dac24d0fbffff | imul ebx, eax // 4881ec30050000 | dec esp // 488b05???????? | // 4833c4 | mov ebp, dword ptr [esp + 0x20] // 48898520040000 | dec esp // 488bf9 | mov esp, dword ptr [esp + 0x28] $sequence_28 = { 488dac24a0feffff 4881ec60020000 488b05???????? 4833c4 48898558010000 4c8bf9 } // n = 6, score = 100 // 488dac24a0feffff | cmp dword ptr [edi + 0xb4], 0 // 4881ec60020000 | dec ebp // 488b05???????? | // 4833c4 | add ebx, ecx // 48898558010000 | nop word ptr [eax + eax] // 4c8bf9 | inc ecx $sequence_29 = { 488dac2490f5ffff 4881ec700b0000 488b05???????? 4833c4 488985600a0000 8a4208 4c8d1d5a98fcff } // n = 7, score = 100 // 488dac2490f5ffff | mov ebp, dword ptr [esp + 0x70] // 4881ec700b0000 | dec ebp // 488b05???????? | // 4833c4 | mov eax, esi // 488985600a0000 | dec ebp // 8a4208 | sub eax, dword ptr [edi + 0x30] // 4c8d1d5a98fcff | inc ecx $sequence_30 = { 488dac2480feffff 4881ec80020000 488b05???????? 4833c4 48898570010000 488bf1 488d4dc8 } // n = 7, score = 100 // 488dac2480feffff | xor edi, edi // 4881ec80020000 | dec esp // 488b05???????? | // 4833c4 | mov dword ptr [esp + 0x28], esp // 48898570010000 | dec esp // 488bf1 | mov dword ptr [esp + 0x20], ebp // 488d4dc8 | xor esi, esi condition: 7 of them and filesize < 1021952 }
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