Actor(s): Turla
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rule win_turla_silentmoon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-03-28" version = "1" description = "Detects win.turla_silentmoon." 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.turla_silentmoon" malpedia_rule_date = "20230328" malpedia_hash = "9d2d75cef573c1c2d861f5197df8f563b05a305d" malpedia_version = "20230407" 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 = { 7c10 c7460401000000 c745fc04000000 eb07 c745fc03000000 8b87a8130000 } // n = 6, score = 300 // 7c10 | jl 0x12 // c7460401000000 | mov dword ptr [esi + 4], 1 // c745fc04000000 | mov dword ptr [ebp - 4], 4 // eb07 | jmp 9 // c745fc03000000 | mov dword ptr [ebp - 4], 3 // 8b87a8130000 | mov eax, dword ptr [edi + 0x13a8] $sequence_1 = { 8955fc e8???????? 8b4df4 83c404 b801000000 d3c0 c745f0ffffffff } // n = 7, score = 300 // 8955fc | mov dword ptr [ebp - 4], edx // e8???????? | // 8b4df4 | mov ecx, dword ptr [ebp - 0xc] // 83c404 | add esp, 4 // b801000000 | mov eax, 1 // d3c0 | rol eax, cl // c745f0ffffffff | mov dword ptr [ebp - 0x10], 0xffffffff $sequence_2 = { 6a00 51 ff15???????? 85db 7410 8b15???????? } // n = 6, score = 300 // 6a00 | push 0 // 51 | push ecx // ff15???????? | // 85db | test ebx, ebx // 7410 | je 0x12 // 8b15???????? | $sequence_3 = { 47 03c9 897dd0 3bfa 7ec7 8b45e4 } // n = 6, score = 300 // 47 | inc edi // 03c9 | add ecx, ecx // 897dd0 | mov dword ptr [ebp - 0x30], edi // 3bfa | cmp edi, edx // 7ec7 | jle 0xffffffc9 // 8b45e4 | mov eax, dword ptr [ebp - 0x1c] $sequence_4 = { 56 6a00 51 ffd7 8b15???????? 53 } // n = 6, score = 300 // 56 | push esi // 6a00 | push 0 // 51 | push ecx // ffd7 | call edi // 8b15???????? | // 53 | push ebx $sequence_5 = { 8d857cfcffff 50 6a00 6a00 ff15???????? 8b15???????? 52 } // n = 7, score = 300 // 8d857cfcffff | lea eax, [ebp - 0x384] // 50 | push eax // 6a00 | push 0 // 6a00 | push 0 // ff15???????? | // 8b15???????? | // 52 | push edx $sequence_6 = { 8d9b00000000 8b4e4c 8b562c 8945cc 8a865b020000 88040a ff464c } // n = 7, score = 300 // 8d9b00000000 | lea ebx, [ebx] // 8b4e4c | mov ecx, dword ptr [esi + 0x4c] // 8b562c | mov edx, dword ptr [esi + 0x2c] // 8945cc | mov dword ptr [ebp - 0x34], eax // 8a865b020000 | mov al, byte ptr [esi + 0x25b] // 88040a | mov byte ptr [edx + ecx], al // ff464c | inc dword ptr [esi + 0x4c] $sequence_7 = { 881408 ff464c c1a65802000008 83865c020000f8 83be5c02000008 8b55cc 7dd1 } // n = 7, score = 300 // 881408 | mov byte ptr [eax + ecx], dl // ff464c | inc dword ptr [esi + 0x4c] // c1a65802000008 | shl dword ptr [esi + 0x258], 8 // 83865c020000f8 | add dword ptr [esi + 0x25c], -8 // 83be5c02000008 | cmp dword ptr [esi + 0x25c], 8 // 8b55cc | mov edx, dword ptr [ebp - 0x34] // 7dd1 | jge 0xffffffd3 $sequence_8 = { ff15???????? a1???????? 83c404 57 6a08 50 } // n = 6, score = 300 // ff15???????? | // a1???????? | // 83c404 | add esp, 4 // 57 | push edi // 6a08 | push 8 // 50 | push eax $sequence_9 = { 09be58020000 8b7df8 898e5c020000 0fb77c7b04 897df4 8b3cba 897dd4 } // n = 7, score = 300 // 09be58020000 | or dword ptr [esi + 0x258], edi // 8b7df8 | mov edi, dword ptr [ebp - 8] // 898e5c020000 | mov dword ptr [esi + 0x25c], ecx // 0fb77c7b04 | movzx edi, word ptr [ebx + edi*2 + 4] // 897df4 | mov dword ptr [ebp - 0xc], edi // 8b3cba | mov edi, dword ptr [edx + edi*4] // 897dd4 | mov dword ptr [ebp - 0x2c], edi condition: 7 of them and filesize < 204800 }
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