Actor(s): Turla
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rule win_turla_silentmoon_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" 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 = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 8b4dd8 57 6a0f 51 e8???????? 83c40c } // n = 6, score = 300 // 8b4dd8 | mov ecx, dword ptr [ebp - 0x28] // 57 | push edi // 6a0f | push 0xf // 51 | push ecx // e8???????? | // 83c40c | add esp, 0xc $sequence_1 = { 8b4508 50 ff15???????? 8a45ff 5f 5e 5b } // n = 7, score = 300 // 8b4508 | mov eax, dword ptr [ebp + 8] // 50 | push eax // ff15???????? | // 8a45ff | mov al, byte ptr [ebp - 1] // 5f | pop edi // 5e | pop esi // 5b | pop ebx $sequence_2 = { 83c408 8b572c 8b4728 56 52 ffd0 } // n = 6, score = 300 // 83c408 | add esp, 8 // 8b572c | mov edx, dword ptr [edi + 0x2c] // 8b4728 | mov eax, dword ptr [edi + 0x28] // 56 | push esi // 52 | push edx // ffd0 | call eax $sequence_3 = { 85c0 7410 53 e8???????? 83c404 32c0 } // n = 6, score = 300 // 85c0 | test eax, eax // 7410 | je 0x12 // 53 | push ebx // e8???????? | // 83c404 | add esp, 4 // 32c0 | xor al, al $sequence_4 = { 898e5c020000 0fb77c7b4e 897df4 8b3cba 897dd4 8b7df4 } // n = 6, score = 300 // 898e5c020000 | mov dword ptr [esi + 0x25c], ecx // 0fb77c7b4e | movzx edi, word ptr [ebx + edi*2 + 0x4e] // 897df4 | mov dword ptr [ebp - 0xc], edi // 8b3cba | mov edi, dword ptr [edx + edi*4] // 897dd4 | mov dword ptr [ebp - 0x2c], edi // 8b7df4 | mov edi, dword ptr [ebp - 0xc] $sequence_5 = { 2bd1 8945f8 894dec 8975f0 83fa0a 7d13 8b5d08 } // n = 7, score = 300 // 2bd1 | sub edx, ecx // 8945f8 | mov dword ptr [ebp - 8], eax // 894dec | mov dword ptr [ebp - 0x14], ecx // 8975f0 | mov dword ptr [ebp - 0x10], esi // 83fa0a | cmp edx, 0xa // 7d13 | jge 0x15 // 8b5d08 | mov ebx, dword ptr [ebp + 8] $sequence_6 = { 75f9 2bc2 a803 7409 c1e802 8d444003 eb06 } // n = 7, score = 300 // 75f9 | jne 0xfffffffb // 2bc2 | sub eax, edx // a803 | test al, 3 // 7409 | je 0xb // c1e802 | shr eax, 2 // 8d444003 | lea eax, [eax + eax*2 + 3] // eb06 | jmp 8 $sequence_7 = { ff15???????? 8945f8 85c0 7419 a1???????? } // n = 5, score = 300 // ff15???????? | // 8945f8 | mov dword ptr [ebp - 8], eax // 85c0 | test eax, eax // 7419 | je 0x1b // a1???????? | $sequence_8 = { 8a54380b 8a5c3e0b 3ada 0f856affffff 8b5508 83c00c 83c60c } // n = 7, score = 300 // 8a54380b | mov dl, byte ptr [eax + edi + 0xb] // 8a5c3e0b | mov bl, byte ptr [esi + edi + 0xb] // 3ada | cmp bl, dl // 0f856affffff | jne 0xffffff70 // 8b5508 | mov edx, dword ptr [ebp + 8] // 83c00c | add eax, 0xc // 83c60c | add esi, 0xc $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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