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 = "2020-08-17" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.4.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.olympic_destroyer" malpedia_rule_date = "20200817" malpedia_hash = "8c895fd01eccb47a6225bcb1a3ba53cbb98644c5" malpedia_version = "20200817" 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 / approach 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 = { eb17 8b442424 6a00 56 51 } // n = 5, score = 100 // eb17 | jmp 0x19 // 8b442424 | mov eax, dword ptr [esp + 0x24] // 6a00 | push 0 // 56 | push esi // 51 | push ecx $sequence_2 = { c9 c3 55 8bec b82c100000 e8???????? } // n = 6, score = 100 // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp // b82c100000 | mov eax, 0x102c // e8???????? | $sequence_3 = { 6a08 ffd6 50 ff15???????? 8d8594f9ffff 50 ffb58cf9ffff } // n = 7, score = 100 // 6a08 | push 8 // ffd6 | call esi // 50 | push eax // ff15???????? | // 8d8594f9ffff | lea eax, [ebp - 0x66c] // 50 | push eax // ffb58cf9ffff | push dword ptr [ebp - 0x674] $sequence_4 = { 83c408 85c0 0f848e000000 8b4614 8d4c2418 } // n = 5, score = 100 // 83c408 | add esp, 8 // 85c0 | test eax, eax // 0f848e000000 | je 0x94 // 8b4614 | mov eax, dword ptr [esi + 0x14] // 8d4c2418 | lea ecx, [esp + 0x18] $sequence_5 = { 8d3c9da41a0002 f00fb10f 8bc8 85c9 740b 8d4101 f7d8 } // n = 7, score = 100 // 8d3c9da41a0002 | lea edi, [ebx*4 + 0x2001aa4] // f00fb10f | lock cmpxchg dword ptr [edi], ecx // 8bc8 | mov ecx, eax // 85c9 | test ecx, ecx // 740b | je 0xd // 8d4101 | lea eax, [ecx + 1] // f7d8 | neg eax $sequence_6 = { 8b87d0000000 53 57 ffd0 806715fd 8bf0 } // n = 6, score = 100 // 8b87d0000000 | mov eax, dword ptr [edi + 0xd0] // 53 | push ebx // 57 | push edi // ffd0 | call eax // 806715fd | and byte ptr [edi + 0x15], 0xfd // 8bf0 | mov esi, eax $sequence_7 = { 742c 8b4614 8d542424 03442438 8d4c2414 6a04 } // n = 6, score = 100 // 742c | je 0x2e // 8b4614 | mov eax, dword ptr [esi + 0x14] // 8d542424 | lea edx, [esp + 0x24] // 03442438 | add eax, dword ptr [esp + 0x38] // 8d4c2414 | lea ecx, [esp + 0x14] // 6a04 | push 4 $sequence_8 = { 56 56 6aff 57 ff15???????? 56 8d85f8efffff } // n = 7, score = 100 // 56 | push esi // 56 | push esi // 6aff | push -1 // 57 | push edi // ff15???????? | // 56 | push esi // 8d85f8efffff | lea eax, [ebp - 0x1008] $sequence_9 = { 8b5c2410 8b542420 85db 0f84defdffff } // n = 4, score = 100 // 8b5c2410 | mov ebx, dword ptr [esp + 0x10] // 8b542420 | mov edx, dword ptr [esp + 0x20] // 85db | test ebx, ebx // 0f84defdffff | je 0xfffffde4 $sequence_10 = { 0f85a9190000 8b75ec 83c714 8b45e8 } // n = 4, score = 100 // 0f85a9190000 | jne 0x19af // 8b75ec | mov esi, dword ptr [ebp - 0x14] // 83c714 | add edi, 0x14 // 8b45e8 | mov eax, dword ptr [ebp - 0x18] $sequence_11 = { ffb590f9ffff 33c0 898d7cf9ffff 8dbd80f9ffff ab } // n = 5, score = 100 // ffb590f9ffff | push dword ptr [ebp - 0x670] // 33c0 | xor eax, eax // 898d7cf9ffff | mov dword ptr [ebp - 0x684], ecx // 8dbd80f9ffff | lea edi, [ebp - 0x680] // ab | stosd dword ptr es:[edi], eax $sequence_12 = { 8975dc ffd3 ff75fc 8b3d???????? 6a08 ffd7 } // n = 6, score = 100 // 8975dc | mov dword ptr [ebp - 0x24], esi // ffd3 | call ebx // ff75fc | push dword ptr [ebp - 4] // 8b3d???????? | // 6a08 | push 8 // ffd7 | call edi $sequence_13 = { 8b7d08 6689442418 8944242a 668944242e 8b0f 89442410 } // n = 6, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 6689442418 | mov word ptr [esp + 0x18], ax // 8944242a | mov dword ptr [esp + 0x2a], eax // 668944242e | mov word ptr [esp + 0x2e], ax // 8b0f | mov ecx, dword ptr [edi] // 89442410 | mov dword ptr [esp + 0x10], eax $sequence_14 = { 53 ffd7 56 8d85e4efffff 50 } // n = 5, score = 100 // 53 | push ebx // ffd7 | call edi // 56 | push esi // 8d85e4efffff | lea eax, [ebp - 0x101c] // 50 | push eax $sequence_15 = { 8b542418 83c404 8b5d08 33c0 83e3f8 } // n = 5, score = 100 // 8b542418 | mov edx, dword ptr [esp + 0x18] // 83c404 | add esp, 4 // 8b5d08 | mov ebx, dword ptr [ebp + 8] // 33c0 | xor eax, eax // 83e3f8 | and ebx, 0xfffffff8 $sequence_16 = { 56 57 8b7c240c 33f6 0f1f840000000000 8b4710 } // n = 6, score = 100 // 56 | push esi // 57 | push edi // 8b7c240c | mov edi, dword ptr [esp + 0xc] // 33f6 | xor esi, esi // 0f1f840000000000 | nop dword ptr [eax + eax] // 8b4710 | mov eax, dword ptr [edi + 0x10] $sequence_17 = { ff15???????? 8b7508 c7465cd86b4000 83660800 } // n = 4, score = 100 // ff15???????? | // 8b7508 | mov esi, dword ptr [ebp + 8] // c7465cd86b4000 | mov dword ptr [esi + 0x5c], 0x406bd8 // 83660800 | and dword ptr [esi + 8], 0 $sequence_18 = { 2bca 7523 2bde 84c0 742b 0fb64c3301 } // n = 6, score = 100 // 2bca | sub ecx, edx // 7523 | jne 0x25 // 2bde | sub ebx, esi // 84c0 | test al, al // 742b | je 0x2d // 0fb64c3301 | movzx ecx, byte ptr [ebx + esi + 1] $sequence_19 = { ff75ec ffd3 85c0 740c } // n = 4, score = 100 // ff75ec | push dword ptr [ebp - 0x14] // ffd3 | call ebx // 85c0 | test eax, eax // 740c | je 0xe $sequence_20 = { e9???????? c745e00042ff01 e9???????? c745dc02000000 c745e00042ff01 8b4508 8bcf } // n = 7, score = 100 // e9???????? | // c745e00042ff01 | mov dword ptr [ebp - 0x20], 0x1ff4200 // e9???????? | // c745dc02000000 | mov dword ptr [ebp - 0x24], 2 // c745e00042ff01 | mov dword ptr [ebp - 0x20], 0x1ff4200 // 8b4508 | mov eax, dword ptr [ebp + 8] // 8bcf | mov ecx, edi $sequence_21 = { 6a40 ff15???????? 8bd0 85d2 7421 33c9 85f6 } // n = 7, score = 100 // 6a40 | push 0x40 // ff15???????? | // 8bd0 | mov edx, eax // 85d2 | test edx, edx // 7421 | je 0x23 // 33c9 | xor ecx, ecx // 85f6 | test esi, esi $sequence_22 = { 81ff040000c0 74ce 5e 8bc7 5f 5d } // n = 6, score = 100 // 81ff040000c0 | cmp edi, 0xc0000004 // 74ce | je 0xffffffd0 // 5e | pop esi // 8bc7 | mov eax, edi // 5f | pop edi // 5d | pop ebp condition: 7 of them and filesize < 1392640 }
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