Actor(s): Kimsuky
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rule win_appleseed_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-05-16" version = "1" description = "Detects win.appleseed." 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.appleseed" malpedia_rule_date = "20220513" malpedia_hash = "7f4b2229e6ae614d86d74917f6d5b41890e62a26" malpedia_version = "20220516" 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 = { 488d93c80f0000 488bcb e8???????? 448b8374af0100 8b9370af0100 488d0d18040200 e8???????? } // n = 7, score = 100 // 488d93c80f0000 | inc esp // 488bcb | mov eax, ebx // e8???????? | // 448b8374af0100 | dec ecx // 8b9370af0100 | mov edx, edi // 488d0d18040200 | dec eax // e8???????? | $sequence_1 = { 48833d????????00 7463 488d15b1160200 488d4db8 } // n = 4, score = 100 // 48833d????????00 | // 7463 | inc esp // 488d15b1160200 | mov eax, dword ptr [ebx + 0x1af74] // 488d4db8 | mov edx, dword ptr [ebx + 0x1af70] $sequence_2 = { 57 4156 488d6c24c0 4881ec40010000 48c7442460feffffff 488b05???????? 4833c4 } // n = 7, score = 100 // 57 | dec eax // 4156 | lea ecx, [esp + 0x44] // 488d6c24c0 | ret // 4881ec40010000 | inc eax // 48c7442460feffffff | push ebx // 488b05???????? | // 4833c4 | dec eax $sequence_3 = { 488d1565e80100 488bc8 e8???????? 84c0 } // n = 4, score = 100 // 488d1565e80100 | dec eax // 488bc8 | mov dword ptr [esp + 0x80], esi // e8???????? | // 84c0 | dec eax $sequence_4 = { 4833c4 4889442470 488bd9 c744243000000000 } // n = 4, score = 100 // 4833c4 | lea edx, [0x21e8c] // 4889442470 | dec eax // 488bd9 | lea ecx, [ebp - 0x48] // c744243000000000 | inc ecx $sequence_5 = { 488bf7 4c8bff 49c1ff05 4c8d2d86bb0100 83e61f 486bf658 4b8b44fd00 } // n = 7, score = 100 // 488bf7 | dec eax // 4c8bff | lea ecx, [ebp - 0x48] // 49c1ff05 | dec eax // 4c8d2d86bb0100 | mov dword ptr [ebp - 0x30], 0xf // 83e61f | dec eax // 486bf658 | mov dword ptr [ebp - 0x38], ebx // 4b8b44fd00 | mov byte ptr [ebp - 0x48], 0 $sequence_6 = { 488d6c24d9 4881eca0000000 48c745e7feffffff 48899c24f8000000 488b05???????? } // n = 5, score = 100 // 488d6c24d9 | lea ecx, [ebp + 0xd81] // 4881eca0000000 | dec eax // 48c745e7feffffff | lea edx, [ebx + 0x1f0] // 48899c24f8000000 | xor edx, edx // 488b05???????? | $sequence_7 = { 488d15c1610200 41b804010000 ff15???????? ffcb 7505 e8???????? b801000000 } // n = 7, score = 100 // 488d15c1610200 | mov dword ptr [ebx + 0x20], ebp // 41b804010000 | dec eax // ff15???????? | // ffcb | xor eax, esp // 7505 | dec eax // e8???????? | // b801000000 | mov dword ptr [esp + 0x50], eax $sequence_8 = { 48c1f805 83e11f 488d15e7cc0100 488b04c2 486bc958 c644080800 85db } // n = 7, score = 100 // 48c1f805 | mov eax, edx // 83e11f | dec eax // 488d15e7cc0100 | mov edx, ecx // 488b04c2 | dec eax // 486bc958 | lea ecx, [0x4dc9] // c644080800 | test eax, eax // 85db | dec ebp $sequence_9 = { 4885c0 7512 4c3bf3 7305 83c8ff eb08 8bc7 } // n = 7, score = 100 // 4885c0 | dec esp // 7512 | lea eax, [0x23a08] // 4c3bf3 | dec eax // 7305 | mov edx, edi // 83c8ff | dec eax // eb08 | lea ecx, [esp + 0x40] // 8bc7 | dec eax condition: 7 of them and filesize < 497664 }
rule win_appleseed_w0 { meta: author = "KrCERT/CC Profound Analysis Team" date = "2020-12-4" info = "Operation MUZABI" hash = "43cc6d190238e851d33066cbe9be9ac8" hash = "fd10bd6013aabadbcb9edb8a23ba7331" hash = "16231e2e8991c60a42f293e0c33ff801" hash = "89fff6645013008cda57f88639b92990" hash = "030e2f992cbc4e61f0d5c994779caf3b" hash = "3620c22671641fbf32cf496b118b85f6" hash = "4876fc88c361743a1220a7b161f8f06f" hash = "94b8a0e4356d0202dc61046e3d8bdfe0" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.appleseed" malpedia_rule_date = "20201015" malpedia_version = "20201015" malpedia_license = "CC NC-BY-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $appleseed_str1 = {0f 8? ?? (00|01) 00 00 [0-1] 83 f? 20 0f 8? (01|00) 00 00} $appleseed_str2 = {88 45 [0-15] 0f b6 44 ?? 01} $appleseed_str3 = {83 f? 10 [0-5] 83 e? 10} $appleseed_key1 = {89 04 ?9 [0-6] ff 34 ?? e8 [10-16] 89 0c 98 8b ?? 0c [0-3] ff 34 98} $appleseed_key2 = {83 f? 10 [0-10] 32 4c 05 ?? ?? 88 4c ?? 0f} $appleseed_key3 = {89 04 ?9 49 83 ?? 04 48 ?? ?? 10 8b 0c a8 e8 [0-10] 48 8b ?? ?8} $seed_str1 = {44 0f b6 44 3d c0 45 32 c7 44 32 45 d4} $seed_str2 = {0f b6 44 3? ?? [0-25] 83 c4 0c} $seed_str3 = {32 45 c? ?? ?? ?? 32 45 e?} condition: uint16(0) == 0x5a4d and filesize < 400KB and (2 of ($appleseed_str*)) and (1 of ($seed_str*)) and (1 of ($appleseed_key*)) }
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