Malware which seems to have no function other than to disrupt computer systems related to the 2018 Winter Olympic event.
rule win_olympic_destroyer_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.olympic_destroyer." 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.olympic_destroyer" malpedia_rule_date = "20211007" malpedia_hash = "e5b790e0f888f252d49063a1251ca60ec2832535" malpedia_version = "20211008" 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 = { 56 33c0 89542414 57 } // n = 4, score = 200 // 56 | push esi // 33c0 | xor eax, eax // 89542414 | mov dword ptr [esp + 0x14], edx // 57 | push edi $sequence_1 = { e8???????? 83c40c 8d442410 50 56 8d442420 50 } // n = 7, score = 100 // e8???????? | // 83c40c | add esp, 0xc // 8d442410 | lea eax, dword ptr [esp + 0x10] // 50 | push eax // 56 | push esi // 8d442420 | lea eax, dword ptr [esp + 0x20] // 50 | push eax $sequence_2 = { 8b1406 85d2 7455 668b81c0a95500 662b81bca95500 6603c2 } // n = 6, score = 100 // 8b1406 | mov edx, dword ptr [esi + eax] // 85d2 | test edx, edx // 7455 | je 0x57 // 668b81c0a95500 | mov ax, word ptr [ecx + 0x55a9c0] // 662b81bca95500 | sub ax, word ptr [ecx + 0x55a9bc] // 6603c2 | add ax, dx $sequence_3 = { a3???????? eb05 a1???????? 85c0 0f848a000000 a1???????? 8d4c240c } // n = 7, score = 100 // a3???????? | // eb05 | jmp 7 // a1???????? | // 85c0 | test eax, eax // 0f848a000000 | je 0x90 // a1???????? | // 8d4c240c | lea ecx, dword ptr [esp + 0xc] $sequence_4 = { 50 52 ffb7a0000000 8b0e } // n = 4, score = 100 // 50 | push eax // 52 | push edx // ffb7a0000000 | push dword ptr [edi + 0xa0] // 8b0e | mov ecx, dword ptr [esi] $sequence_5 = { 8bec 83e4f8 83ec1c 834c240cff 53 56 } // n = 6, score = 100 // 8bec | mov ebp, esp // 83e4f8 | and esp, 0xfffffff8 // 83ec1c | sub esp, 0x1c // 834c240cff | or dword ptr [esp + 0xc], 0xffffffff // 53 | push ebx // 56 | push esi $sequence_6 = { 50 ff15???????? 8d4ddc 51 8d4df4 51 8d4dfc } // n = 7, score = 100 // 50 | push eax // ff15???????? | // 8d4ddc | lea ecx, dword ptr [ebp - 0x24] // 51 | push ecx // 8d4df4 | lea ecx, dword ptr [ebp - 0xc] // 51 | push ecx // 8d4dfc | lea ecx, dword ptr [ebp - 4] $sequence_7 = { 50 52 ff55f0 83c40c } // n = 4, score = 100 // 50 | push eax // 52 | push edx // ff55f0 | call dword ptr [ebp - 0x10] // 83c40c | add esp, 0xc $sequence_8 = { 50 52 ba6c000000 e8???????? 8b54244c } // n = 5, score = 100 // 50 | push eax // 52 | push edx // ba6c000000 | mov edx, 0x6c // e8???????? | // 8b54244c | mov edx, dword ptr [esp + 0x4c] $sequence_9 = { 50 53 50 8bce } // n = 4, score = 100 // 50 | push eax // 53 | push ebx // 50 | push eax // 8bce | mov ecx, esi $sequence_10 = { 85c0 743a 0fb644240f ff4c2410 8d348508000000 56 6a40 } // n = 7, score = 100 // 85c0 | test eax, eax // 743a | je 0x3c // 0fb644240f | movzx eax, byte ptr [esp + 0xf] // ff4c2410 | dec dword ptr [esp + 0x10] // 8d348508000000 | lea esi, dword ptr [eax*4 + 8] // 56 | push esi // 6a40 | push 0x40 $sequence_11 = { 50 52 ba02000000 e8???????? } // n = 4, score = 100 // 50 | push eax // 52 | push edx // ba02000000 | mov edx, 2 // e8???????? | $sequence_12 = { 59 8b75e4 c3 53 56 57 8b542410 } // n = 7, score = 100 // 59 | pop ecx // 8b75e4 | mov esi, dword ptr [ebp - 0x1c] // c3 | ret // 53 | push ebx // 56 | push esi // 57 | push edi // 8b542410 | mov edx, dword ptr [esp + 0x10] $sequence_13 = { 8d442408 50 6a04 68???????? } // n = 4, score = 100 // 8d442408 | lea eax, dword ptr [esp + 8] // 50 | push eax // 6a04 | push 4 // 68???????? | $sequence_14 = { 50 52 ff742434 ba62000000 } // n = 4, score = 100 // 50 | push eax // 52 | push edx // ff742434 | push dword ptr [esp + 0x34] // ba62000000 | mov edx, 0x62 $sequence_15 = { 50 52 8d45d8 c745dc00000000 50 c745e000000000 } // n = 6, score = 100 // 50 | push eax // 52 | push edx // 8d45d8 | lea eax, dword ptr [ebp - 0x28] // c745dc00000000 | mov dword ptr [ebp - 0x24], 0 // 50 | push eax // c745e000000000 | mov dword ptr [ebp - 0x20], 0 $sequence_16 = { 57 50 898588f9ffff 8d85e4fbffff 68???????? 50 ff15???????? } // n = 7, score = 100 // 57 | push edi // 50 | push eax // 898588f9ffff | mov dword ptr [ebp - 0x678], eax // 8d85e4fbffff | lea eax, dword ptr [ebp - 0x41c] // 68???????? | // 50 | push eax // ff15???????? | $sequence_17 = { 33f6 56 ff15???????? 8945e0 3bc6 0f8431010000 53 } // n = 7, score = 100 // 33f6 | xor esi, esi // 56 | push esi // ff15???????? | // 8945e0 | mov dword ptr [ebp - 0x20], eax // 3bc6 | cmp eax, esi // 0f8431010000 | je 0x137 // 53 | push ebx $sequence_18 = { 0fb74602 8d4c2454 50 e8???????? } // n = 4, score = 100 // 0fb74602 | movzx eax, word ptr [esi + 2] // 8d4c2454 | lea ecx, dword ptr [esp + 0x54] // 50 | push eax // e8???????? | $sequence_19 = { 897dd4 8b5dd0 ebab c745e4a8614000 817de4ac614000 } // n = 5, score = 100 // 897dd4 | mov dword ptr [ebp - 0x2c], edi // 8b5dd0 | mov ebx, dword ptr [ebp - 0x30] // ebab | jmp 0xffffffad // c745e4a8614000 | mov dword ptr [ebp - 0x1c], 0x4061a8 // 817de4ac614000 | cmp dword ptr [ebp - 0x1c], 0x4061ac $sequence_20 = { 55 56 57 33ff 833d????????06 897c2414 } // n = 6, score = 100 // 55 | push ebp // 56 | push esi // 57 | push edi // 33ff | xor edi, edi // 833d????????06 | // 897c2414 | mov dword ptr [esp + 0x14], edi $sequence_21 = { ff15???????? 83c40c 8d8594f9ffff 50 8d85e4fbffff 50 ff15???????? } // n = 7, score = 100 // ff15???????? | // 83c40c | add esp, 0xc // 8d8594f9ffff | lea eax, dword ptr [ebp - 0x66c] // 50 | push eax // 8d85e4fbffff | lea eax, dword ptr [ebp - 0x41c] // 50 | push eax // ff15???????? | $sequence_22 = { 5d 8b0481 03c3 5b } // n = 4, score = 100 // 5d | pop ebp // 8b0481 | mov eax, dword ptr [ecx + eax*4] // 03c3 | add eax, ebx // 5b | pop ebx condition: 7 of them and filesize < 1392640 }
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