Actor(s): Lazarus Group, Sandworm, TeleBots
There is no description at this point.
rule win_killdisk_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2020-10-14" version = "1" description = "autogenerated rule brought to you by yara-signator" tool = "yara-signator v0.5.0" tool_config = "callsandjumps;datarefs;binvalue" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.killdisk" malpedia_rule_date = "20201014" malpedia_hash = "a7e3bd57eaf12bf3ea29a863c041091ba3af9ac9" malpedia_version = "20201014" 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 = { 394c2440 7304 8d44242c 8b54243c 881c10 394c2440 } // n = 6, score = 100 // 394c2440 | cmp dword ptr [esp + 0x40], ecx // 7304 | jae 6 // 8d44242c | lea eax, [esp + 0x2c] // 8b54243c | mov edx, dword ptr [esp + 0x3c] // 881c10 | mov byte ptr [eax + edx], bl // 394c2440 | cmp dword ptr [esp + 0x40], ecx $sequence_1 = { f6d0 e9???????? 46 60 9c 9c 8d642428 } // n = 7, score = 100 // f6d0 | not al // e9???????? | // 46 | inc esi // 60 | pushal // 9c | pushfd // 9c | pushfd // 8d642428 | lea esp, [esp + 0x28] $sequence_2 = { e9???????? 60 66f7f1 56 } // n = 4, score = 100 // e9???????? | // 60 | pushal // 66f7f1 | div cx // 56 | push esi $sequence_3 = { 8f442420 ff3424 660fb6f3 5e e8???????? 66ffc6 e8???????? } // n = 7, score = 100 // 8f442420 | pop dword ptr [esp + 0x20] // ff3424 | push dword ptr [esp] // 660fb6f3 | movzx si, bl // 5e | pop esi // e8???????? | // 66ffc6 | inc si // e8???????? | $sequence_4 = { 83c408 8bcf 8bc3 668b10 663b11 751e } // n = 6, score = 100 // 83c408 | add esp, 8 // 8bcf | mov ecx, edi // 8bc3 | mov eax, ebx // 668b10 | mov dx, word ptr [eax] // 663b11 | cmp dx, word ptr [ecx] // 751e | jne 0x20 $sequence_5 = { 50 8d642434 e9???????? 660fbcc3 660fa5e0 8b4500 } // n = 6, score = 100 // 50 | push eax // 8d642434 | lea esp, [esp + 0x34] // e9???????? | // 660fbcc3 | bsf ax, bx // 660fa5e0 | shld ax, sp, cl // 8b4500 | mov eax, dword ptr [ebp] $sequence_6 = { 9c 8f442408 660fcf 87742404 87fe e8???????? } // n = 6, score = 100 // 9c | pushfd // 8f442408 | pop dword ptr [esp + 8] // 660fcf | bswap di // 87742404 | xchg dword ptr [esp + 4], esi // 87fe | xchg esi, edi // e8???????? | $sequence_7 = { 57 e8???????? 8b44240c 83c404 898710040000 } // n = 5, score = 100 // 57 | push edi // e8???????? | // 8b44240c | mov eax, dword ptr [esp + 0xc] // 83c404 | add esp, 4 // 898710040000 | mov dword ptr [edi + 0x410], eax $sequence_8 = { 60 896c2434 e8???????? 8b4500 60 } // n = 5, score = 100 // 60 | pushal // 896c2434 | mov dword ptr [esp + 0x34], ebp // e8???????? | // 8b4500 | mov eax, dword ptr [ebp] // 60 | pushal $sequence_9 = { 83ff05 7ca3 6804010000 8d842434010000 50 ff15???????? 668b0d???????? } // n = 7, score = 100 // 83ff05 | cmp edi, 5 // 7ca3 | jl 0xffffffa5 // 6804010000 | push 0x104 // 8d842434010000 | lea eax, [esp + 0x134] // 50 | push eax // ff15???????? | // 668b0d???????? | $sequence_10 = { c3 85f6 74f6 8bfe e8???????? 8b4314 33ed } // n = 7, score = 100 // c3 | ret // 85f6 | test esi, esi // 74f6 | je 0xfffffff8 // 8bfe | mov edi, esi // e8???????? | // 8b4314 | mov eax, dword ptr [ebx + 0x14] // 33ed | xor ebp, ebp $sequence_11 = { 66c78424640200005c00 66c78424680200002e00 8984246c020000 89842470020000 89842474020000 } // n = 5, score = 100 // 66c78424640200005c00 | mov word ptr [esp + 0x264], 0x5c // 66c78424680200002e00 | mov word ptr [esp + 0x268], 0x2e // 8984246c020000 | mov dword ptr [esp + 0x26c], eax // 89842470020000 | mov dword ptr [esp + 0x270], eax // 89842474020000 | mov dword ptr [esp + 0x274], eax $sequence_12 = { 0fa4c109 8d95c0fdffff c1e009 52 50 } // n = 5, score = 100 // 0fa4c109 | shld ecx, eax, 9 // 8d95c0fdffff | lea edx, [ebp - 0x240] // c1e009 | shl eax, 9 // 52 | push edx // 50 | push eax $sequence_13 = { 8d3c85c00f4100 8b07 c1e606 8a4c3004 f6c101 } // n = 5, score = 100 // 8d3c85c00f4100 | lea edi, [eax*4 + 0x410fc0] // 8b07 | mov eax, dword ptr [edi] // c1e606 | shl esi, 6 // 8a4c3004 | mov cl, byte ptr [eax + esi + 4] // f6c101 | test cl, 1 $sequence_14 = { 7316 8bce 8906 83c104 890d???????? } // n = 5, score = 100 // 7316 | jae 0x18 // 8bce | mov ecx, esi // 8906 | mov dword ptr [esi], eax // 83c104 | add ecx, 4 // 890d???????? | $sequence_15 = { 84c9 75f9 2bc2 3bf0 72d3 8d542444 } // n = 6, score = 100 // 84c9 | test cl, cl // 75f9 | jne 0xfffffffb // 2bc2 | sub eax, edx // 3bf0 | cmp esi, eax // 72d3 | jb 0xffffffd5 // 8d542444 | lea edx, [esp + 0x44] $sequence_16 = { 7353 8bc1 c1f805 8bf1 83e61f 8d3c85c00f4100 8b07 } // n = 7, score = 100 // 7353 | jae 0x55 // 8bc1 | mov eax, ecx // c1f805 | sar eax, 5 // 8bf1 | mov esi, ecx // 83e61f | and esi, 0x1f // 8d3c85c00f4100 | lea edi, [eax*4 + 0x410fc0] // 8b07 | mov eax, dword ptr [edi] $sequence_17 = { 0f87cb090000 ff2485cd404000 838de8fdffffff 89b594fdffff } // n = 4, score = 100 // 0f87cb090000 | ja 0x9d1 // ff2485cd404000 | jmp dword ptr [eax*4 + 0x4040cd] // 838de8fdffffff | or dword ptr [ebp - 0x218], 0xffffffff // 89b594fdffff | mov dword ptr [ebp - 0x26c], esi $sequence_18 = { 83c404 85ff 7485 681c040000 6a00 } // n = 5, score = 100 // 83c404 | add esp, 4 // 85ff | test edi, edi // 7485 | je 0xffffff87 // 681c040000 | push 0x41c // 6a00 | push 0 $sequence_19 = { 51 e8???????? 8d942478050000 52 8d84246c010000 } // n = 5, score = 100 // 51 | push ecx // e8???????? | // 8d942478050000 | lea edx, [esp + 0x578] // 52 | push edx // 8d84246c010000 | lea eax, [esp + 0x16c] $sequence_20 = { 66897c240c 882c24 c64424044f 8d642454 e9???????? 880424 8774242c } // n = 7, score = 100 // 66897c240c | mov word ptr [esp + 0xc], di // 882c24 | mov byte ptr [esp], ch // c64424044f | mov byte ptr [esp + 4], 0x4f // 8d642454 | lea esp, [esp + 0x54] // e9???????? | // 880424 | mov byte ptr [esp], al // 8774242c | xchg dword ptr [esp + 0x2c], esi $sequence_21 = { e8???????? e8???????? ff742424 8f4500 9c ff742404 } // n = 6, score = 100 // e8???????? | // e8???????? | // ff742424 | push dword ptr [esp + 0x24] // 8f4500 | pop dword ptr [ebp] // 9c | pushfd // ff742404 | push dword ptr [esp + 4] $sequence_22 = { 50 8d8c245c010000 51 8d942468020000 } // n = 4, score = 100 // 50 | push eax // 8d8c245c010000 | lea ecx, [esp + 0x15c] // 51 | push ecx // 8d942468020000 | lea edx, [esp + 0x268] $sequence_23 = { 83c404 83fe10 7cef 68???????? 68e08fc201 e8???????? 8bf0 } // n = 7, score = 100 // 83c404 | add esp, 4 // 83fe10 | cmp esi, 0x10 // 7cef | jl 0xfffffff1 // 68???????? | // 68e08fc201 | push 0x1c28fe0 // e8???????? | // 8bf0 | mov esi, eax condition: 7 of them and filesize < 10817536 }
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