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 = "2022-11-21" 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 = "20221118" malpedia_hash = "e0702e2e6d1d00da65c8a29a4ebacd0a4c59e1af" malpedia_version = "20221125" 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 = { ffd7 a3???????? 8d85ccf3ffff 50 56 ffd7 a3???????? } // n = 7, score = 400 // ffd7 | call edi // a3???????? | // 8d85ccf3ffff | lea eax, [ebp - 0xc34] // 50 | push eax // 56 | push esi // ffd7 | call edi // a3???????? | $sequence_1 = { 6800f70484 6a00 6a00 68???????? 8d85e4fbffff 50 8d45e4 } // n = 7, score = 400 // 6800f70484 | push 0x8404f700 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | // 8d85e4fbffff | lea eax, [ebp - 0x41c] // 50 | push eax // 8d45e4 | lea eax, [ebp - 0x1c] $sequence_2 = { 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_3 = { 56 eb18 6a00 6a00 6a00 68???????? } // n = 6, score = 400 // 56 | push esi // eb18 | jmp 0x1a // 6a00 | push 0 // 6a00 | push 0 // 6a00 | push 0 // 68???????? | $sequence_4 = { 85c0 7516 ff15???????? 8bd8 e8???????? } // n = 5, score = 400 // 85c0 | test eax, eax // 7516 | jne 0x18 // ff15???????? | // 8bd8 | mov ebx, eax // e8???????? | $sequence_5 = { ffd7 a3???????? 8d85dcf7ffff 50 53 } // n = 5, score = 400 // ffd7 | call edi // a3???????? | // 8d85dcf7ffff | lea eax, [ebp - 0x824] // 50 | push eax // 53 | push ebx $sequence_6 = { 33c0 eb05 1bc0 83c801 85c0 7423 6a00 } // n = 7, score = 400 // 33c0 | xor eax, eax // eb05 | jmp 7 // 1bc0 | sbb eax, eax // 83c801 | or eax, 1 // 85c0 | test eax, eax // 7423 | je 0x25 // 6a00 | push 0 $sequence_7 = { a1???????? 33c5 8945fc 833d????????00 7413 b801000000 } // n = 6, score = 400 // a1???????? | // 33c5 | xor eax, ebp // 8945fc | mov dword ptr [ebp - 4], eax // 833d????????00 | // 7413 | je 0x15 // b801000000 | mov eax, 1 $sequence_8 = { b9???????? e8???????? 8d95c8f2ffff b9???????? e8???????? } // n = 5, score = 400 // b9???????? | // e8???????? | // 8d95c8f2ffff | lea edx, [ebp - 0xd38] // b9???????? | // e8???????? | $sequence_9 = { 428bbc0888000000 468b540f20 468b5c0f24 4d03d1 4d03d9 666666660f1f840000000000 } // n = 6, score = 300 // 428bbc0888000000 | mov dword ptr [esp + 0x60], ebp // 468b540f20 | dec eax // 468b5c0f24 | mov ecx, dword ptr [eax + 0x18] // 4d03d1 | dec eax // 4d03d9 | mov edi, dword ptr [esp + 0x30] // 666666660f1f840000000000 | dec eax $sequence_10 = { 8b4520 4883c514 85c0 0f857affffff 4c8b7c2460 4c8b6c2420 4c8b642428 } // n = 7, score = 300 // 8b4520 | mov eax, dword ptr [ebp + 0x20] // 4883c514 | dec eax // 85c0 | add ebp, 0x14 // 0f857affffff | test eax, eax // 4c8b7c2460 | jne 0xffffff82 // 4c8b6c2420 | dec esp // 4c8b642428 | mov edi, dword ptr [esp + 0x60] $sequence_11 = { 488b7c2430 488b742438 488b6c2470 4d8bc6 4d2b4730 4183bfb400000000 } // n = 6, score = 300 // 488b7c2430 | jmp 0xffffffe0 // 488b742438 | dec eax // 488b6c2470 | mov eax, dword ptr [0x60] // 4d8bc6 | dec eax // 4d2b4730 | mov dword ptr [esp + 0x30], edi // 4183bfb400000000 | dec eax $sequence_12 = { 4889742438 4533ff 4c89642428 4c896c2420 33f6 } // n = 5, score = 300 // 4889742438 | mov eax, esi // 4533ff | dec ebp // 4c89642428 | sub eax, dword ptr [edi + 0x30] // 4c896c2420 | inc ecx // 33f6 | cmp dword ptr [edi + 0xb4], 0 $sequence_13 = { 33f6 4533ed 4533e4 4c897c2468 } // n = 4, score = 300 // 33f6 | mov esi, dword ptr [esp + 0x38] // 4533ed | dec eax // 4533e4 | mov ebp, dword ptr [esp + 0x70] // 4c897c2468 | dec ebp $sequence_14 = { 33d2 4883c9ff 4903de ff542468 } // n = 4, score = 300 // 33d2 | xor ebp, ebp // 4883c9ff | inc ebp // 4903de | xor esp, esp // ff542468 | dec esp $sequence_15 = { 7405 48ffcd ebdb 65488b042560000000 48897c2430 48896c2460 488b4818 } // n = 7, score = 300 // 7405 | dec esp // 48ffcd | mov ebp, dword ptr [esp + 0x20] // ebdb | dec esp // 65488b042560000000 | mov esp, dword ptr [esp + 0x28] // 48897c2430 | je 7 // 48896c2460 | dec eax // 488b4818 | dec ebp $sequence_16 = { 85c9 0f8494020000 89bda0000000 897d30 } // n = 4, score = 200 // 85c9 | imul ebx, eax // 0f8494020000 | jne 0x18 // 89bda0000000 | mov ebx, eax // 897d30 | mov ebx, eax $sequence_17 = { 8b442468 6683f809 7508 83f809 } // n = 4, score = 200 // 8b442468 | dec eax // 6683f809 | mov ecx, dword ptr [eax + 0x18] // 7508 | inc ecx // 83f809 | mov ebx, 1 $sequence_18 = { 8b7590 660f1f440000 837df000 0f841b020000 } // n = 4, score = 200 // 8b7590 | inc ecx // 660f1f440000 | mov eax, 0x3000 // 837df000 | jne 0x18 // 0f841b020000 | mov ebx, eax $sequence_19 = { 4c89642430 c744242880000000 c744242002000000 4533c9 4533c0 ba00000040 } // n = 6, score = 200 // 4c89642430 | mov ebx, eax // c744242880000000 | jne 0x18 // c744242002000000 | mov ebx, eax // 4533c9 | imul ebx, eax // 4533c0 | test eax, eax // ba00000040 | jne 0x1a $sequence_20 = { 85c0 0f84b3000000 85f6 0f8497000000 8bd6 } // n = 5, score = 200 // 85c0 | dec eax // 0f84b3000000 | mov ebp, dword ptr [esp + 0x60] // 85f6 | dec esp // 0f8497000000 | arpl word ptr [ebp + 0x3c], di // 8bd6 | xor ecx, ecx $sequence_21 = { 85c0 7471 895c2468 8d4801 } // n = 4, score = 200 // 85c0 | imul ebx, eax // 7471 | test eax, eax // 895c2468 | jne 0x1a // 8d4801 | mov ebx, eax $sequence_22 = { 8bd7 3bd8 0f94c2 85d2 7419 } // n = 5, score = 200 // 8bd7 | xor ebp, ebp // 3bd8 | inc ebp // 0f94c2 | xor esp, esp // 85d2 | xor edx, edx // 7419 | dec eax $sequence_23 = { 8bcf 85c0 0f94c1 85c9 0f8494020000 } // n = 5, score = 200 // 8bcf | mov dword ptr [esp + 0x30], edi // 85c0 | dec eax // 0f94c1 | mov dword ptr [esp + 0x60], ebp // 85c9 | inc ebp // 0f8494020000 | xor edi, edi $sequence_24 = { ff15???????? 498bc6 488b4d20 4833cc } // n = 4, score = 200 // ff15???????? | // 498bc6 | jne 0x1a // 488b4d20 | mov ebx, eax // 4833cc | imul ebx, eax $sequence_25 = { 8bc7 458bf1 c1c005 03c2 } // n = 4, score = 100 // 8bc7 | mov esi, dword ptr [ebp - 0x70] // 458bf1 | nop word ptr [eax + eax] // c1c005 | cmp dword ptr [ebp - 0x10], 0 // 03c2 | je 0x22e $sequence_26 = { 8bc7 412bc1 4469cb8b000000 4103c2 69c8b5000000 } // n = 5, score = 100 // 8bc7 | test ecx, ecx // 412bc1 | je 0x29f // 4469cb8b000000 | mov ecx, edi // 4103c2 | test eax, eax // 69c8b5000000 | sete cl $sequence_27 = { 8bc7 4d8d4004 8bcf d1e9 } // n = 4, score = 100 // 8bc7 | inc ecx // 4d8d4004 | sub eax, ecx // 8bcf | inc esp // d1e9 | mov dword ptr [ebp + 0x28], eax $sequence_28 = { 8bc7 488b4c2468 4833cc e8???????? 4c8d5c2470 498b5b28 } // n = 6, score = 100 // 8bc7 | inc ebp // 488b4c2468 | xor ecx, ecx // 4833cc | inc ebp // e8???????? | // 4c8d5c2470 | xor eax, eax // 498b5b28 | mov edx, 0x40000000 $sequence_29 = { 8bc7 483bc1 7504 33c0 } // n = 4, score = 100 // 8bc7 | cmp ax, 9 // 483bc1 | jne 0xe // 7504 | cmp eax, 9 // 33c0 | lea esi, [ebx + 0x40] $sequence_30 = { 8bc7 412bc1 44894528 4103c2 } // n = 4, score = 100 // 8bc7 | mov dword ptr [ebp + 0xa0], edi // 412bc1 | mov dword ptr [ebp + 0x30], edi // 44894528 | test eax, eax // 4103c2 | je 0xbb condition: 7 of them and filesize < 1021952 }
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