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 = "2023-12-06" 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 = "20231130" malpedia_hash = "fc8a0e9f343f6d6ded9e7df1a64dac0cc68d7351" malpedia_version = "20230808" 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 = { 6690 3939 770a 8bc1 46 } // n = 5, score = 100 // 6690 | nop // 3939 | cmp dword ptr [ecx], edi // 770a | ja 0xc // 8bc1 | mov eax, ecx // 46 | inc esi $sequence_2 = { 8b0c8d60ee5500 80643128fd 5f 5e } // n = 4, score = 100 // 8b0c8d60ee5500 | mov ecx, dword ptr [ecx*4 + 0x55ee60] // 80643128fd | and byte ptr [ecx + esi + 0x28], 0xfd // 5f | pop edi // 5e | pop esi $sequence_3 = { 50 689b000000 e8???????? e9???????? } // n = 4, score = 100 // 50 | push eax // 689b000000 | push 0x9b // e8???????? | // e9???????? | $sequence_4 = { ff15???????? 6880ee3600 ff15???????? 6800000500 56 } // n = 5, score = 100 // ff15???????? | // 6880ee3600 | push 0x36ee80 // ff15???????? | // 6800000500 | push 0x50000 // 56 | push esi $sequence_5 = { 50 68???????? e8???????? 83c408 8907 85c0 0f8480000000 } // n = 7, score = 100 // 50 | push eax // 68???????? | // e8???????? | // 83c408 | add esp, 8 // 8907 | mov dword ptr [edi], eax // 85c0 | test eax, eax // 0f8480000000 | je 0x86 $sequence_6 = { a1???????? 85c0 741a 833d????????00 7c0a } // n = 5, score = 100 // a1???????? | // 85c0 | test eax, eax // 741a | je 0x1c // 833d????????00 | // 7c0a | jl 0xc $sequence_7 = { 50 68???????? 8d85e4fcffff 6805010000 } // n = 4, score = 100 // 50 | push eax // 68???????? | // 8d85e4fcffff | lea eax, [ebp - 0x31c] // 6805010000 | push 0x105 $sequence_8 = { a1???????? c705????????f3274000 8935???????? a3???????? ff15???????? a3???????? 83f8ff } // n = 7, score = 100 // a1???????? | // c705????????f3274000 | // 8935???????? | // a3???????? | // ff15???????? | // a3???????? | // 83f8ff | cmp eax, -1 $sequence_9 = { 7678 eb06 8b8de8efffff 2b8df0efffff 1b85f4efffff } // n = 5, score = 100 // 7678 | jbe 0x7a // eb06 | jmp 8 // 8b8de8efffff | mov ecx, dword ptr [ebp - 0x1018] // 2b8df0efffff | sub ecx, dword ptr [ebp - 0x1010] // 1b85f4efffff | sbb eax, dword ptr [ebp - 0x100c] $sequence_10 = { 2bfa 8d0450 57 50 } // n = 4, score = 100 // 2bfa | sub edi, edx // 8d0450 | lea eax, [eax + edx*2] // 57 | push edi // 50 | push eax $sequence_11 = { 750b ff15???????? e9???????? 8b3d???????? 6a02 56 } // n = 6, score = 100 // 750b | jne 0xd // ff15???????? | // e9???????? | // 8b3d???????? | // 6a02 | push 2 // 56 | push esi $sequence_12 = { 83f8fe 7419 8a4a02 3a4e02 } // n = 4, score = 100 // 83f8fe | cmp eax, -2 // 7419 | je 0x1b // 8a4a02 | mov cl, byte ptr [edx + 2] // 3a4e02 | cmp cl, byte ptr [esi + 2] $sequence_13 = { 83ffff 743a 8d857cf9ffff 50 57 ff15???????? } // n = 6, score = 100 // 83ffff | cmp edi, -1 // 743a | je 0x3c // 8d857cf9ffff | lea eax, [ebp - 0x684] // 50 | push eax // 57 | push edi // ff15???????? | $sequence_14 = { 898588f9ffff 8d85e4fbffff 68???????? 50 ff15???????? 83c40c 8d8594f9ffff } // n = 7, score = 100 // 898588f9ffff | mov dword ptr [ebp - 0x678], eax // 8d85e4fbffff | lea eax, [ebp - 0x41c] // 68???????? | // 50 | push eax // ff15???????? | // 83c40c | add esp, 0xc // 8d8594f9ffff | lea eax, [ebp - 0x66c] $sequence_15 = { 8d842494000000 89442424 8d54241c 8b44245c 8d4c2424 6a24 } // n = 6, score = 100 // 8d842494000000 | lea eax, [esp + 0x94] // 89442424 | mov dword ptr [esp + 0x24], eax // 8d54241c | lea edx, [esp + 0x1c] // 8b44245c | mov eax, dword ptr [esp + 0x5c] // 8d4c2424 | lea ecx, [esp + 0x24] // 6a24 | push 0x24 $sequence_16 = { 50 68???????? 8bd7 8bcb e8???????? 8bd8 } // n = 6, score = 100 // 50 | push eax // 68???????? | // 8bd7 | mov edx, edi // 8bcb | mov ecx, ebx // e8???????? | // 8bd8 | mov ebx, eax $sequence_17 = { 8d8580f7ffff 50 56 56 56 56 } // n = 6, score = 100 // 8d8580f7ffff | lea eax, [ebp - 0x880] // 50 | push eax // 56 | push esi // 56 | push esi // 56 | push esi // 56 | push esi $sequence_18 = { 89442418 85c0 743a 57 } // n = 4, score = 100 // 89442418 | mov dword ptr [esp + 0x18], eax // 85c0 | test eax, eax // 743a | je 0x3c // 57 | push edi $sequence_19 = { 50 68???????? 8d85ecfdffff 6805010000 } // n = 4, score = 100 // 50 | push eax // 68???????? | // 8d85ecfdffff | lea eax, [ebp - 0x214] // 6805010000 | push 0x105 $sequence_20 = { ffd6 50 ff15???????? 8d8594f9ffff } // n = 4, score = 100 // ffd6 | call esi // 50 | push eax // ff15???????? | // 8d8594f9ffff | lea eax, [ebp - 0x66c] $sequence_21 = { 50 68???????? e8???????? 83c40c 8903 5f } // n = 6, score = 100 // 50 | push eax // 68???????? | // e8???????? | // 83c40c | add esp, 0xc // 8903 | mov dword ptr [ebx], eax // 5f | pop edi $sequence_22 = { 50 68???????? 8901 ff770c e8???????? 83c40c } // n = 6, score = 100 // 50 | push eax // 68???????? | // 8901 | mov dword ptr [ecx], eax // ff770c | push dword ptr [edi + 0xc] // e8???????? | // 83c40c | add esp, 0xc condition: 7 of them and filesize < 1392640 }
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