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rule win_ccleaner_backdoor_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.ccleaner_backdoor" 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 = { 750a b857000780 e9???????? e8???????? } // n = 4, score = 200 // 750a | jne 0xc // b857000780 | mov eax, 0x80070057 // e9???????? | // e8???????? | $sequence_1 = { ffd6 50 ff15???????? 8b3d???????? 59 } // n = 5, score = 200 // ffd6 | call esi // 50 | push eax // ff15???????? | // 8b3d???????? | // 59 | pop ecx $sequence_2 = { 83c40c 668945c2 8bcf 8845c5 } // n = 4, score = 100 // 83c40c | add esp, 0xc // 668945c2 | mov word ptr [ebp - 0x3e], ax // 8bcf | mov ecx, edi // 8845c5 | mov byte ptr [ebp - 0x3b], al $sequence_3 = { 8d45ec 50 8d45f8 50 6a1f 56 } // n = 6, score = 100 // 8d45ec | lea eax, [ebp - 0x14] // 50 | push eax // 8d45f8 | lea eax, [ebp - 8] // 50 | push eax // 6a1f | push 0x1f // 56 | push esi $sequence_4 = { 81ec34030000 a1???????? 33c4 89842430030000 8b842444030000 } // n = 5, score = 100 // 81ec34030000 | sub esp, 0x334 // a1???????? | // 33c4 | xor eax, esp // 89842430030000 | mov dword ptr [esp + 0x330], eax // 8b842444030000 | mov eax, dword ptr [esp + 0x344] $sequence_5 = { 48894208 740d 488b06 ba01000000 488bce ff10 834718ff } // n = 7, score = 100 // 48894208 | inc ebp // 740d | xor esi, esi // 488b06 | dec ebp // ba01000000 | mov ebp, eax // 488bce | dec eax // ff10 | mov dword ptr [edx + 8], eax // 834718ff | je 0xf $sequence_6 = { cc 4053 4883ec20 488d0547e1ffff } // n = 4, score = 100 // cc | add dword ptr [edi + 0x18], -1 // 4053 | mov esi, dword ptr [ebx + 0x40] // 4883ec20 | inc ecx // 488d0547e1ffff | mov eax, esp $sequence_7 = { 7534 8b06 c1e008 c68438a000000053 } // n = 4, score = 100 // 7534 | jne 0x36 // 8b06 | mov eax, dword ptr [esi] // c1e008 | shl eax, 8 // c68438a000000053 | mov byte ptr [eax + edi + 0xa0], 0x53 $sequence_8 = { 59 8945cc 6a01 6800008800 53 } // n = 5, score = 100 // 59 | pop ecx // 8945cc | mov dword ptr [ebp - 0x34], eax // 6a01 | push 1 // 6800008800 | push 0x880000 // 53 | push ebx $sequence_9 = { 49 c1e802 4c 8bca c1e002 } // n = 5, score = 100 // 49 | dec eax // c1e802 | mov eax, esi // 4c | dec ebp // 8bca | lea ecx, [eax + 3] // c1e002 | dec eax $sequence_10 = { 4a8b941f18180000 4b3b141a 7504 33c0 eb05 } // n = 5, score = 100 // 4a8b941f18180000 | dec eax // 4b3b141a | cmp esi, -1 // 7504 | setb al // 33c0 | inc ecx // eb05 | cmp eax, esp $sequence_11 = { e8???????? eb0b ffb660040000 e8???????? 8b86a0040000 83c418 } // n = 6, score = 100 // e8???????? | // eb0b | jmp 0xd // ffb660040000 | push dword ptr [esi + 0x460] // e8???????? | // 8b86a0040000 | mov eax, dword ptr [esi + 0x4a0] // 83c418 | add esp, 0x18 $sequence_12 = { e8???????? 59 59 663b442414 7404 33c0 } // n = 6, score = 100 // e8???????? | // 59 | pop ecx // 59 | pop ecx // 663b442414 | cmp ax, word ptr [esp + 0x14] // 7404 | je 6 // 33c0 | xor eax, eax $sequence_13 = { 75f9 6a01 58 5f } // n = 4, score = 100 // 75f9 | call esi // 6a01 | push eax // 58 | pop ecx // 5f | call edi $sequence_14 = { 03d5 48 63c8 4c 2bc9 4d 2bc8 } // n = 7, score = 100 // 03d5 | pop ecx // 48 | call edi // 63c8 | add eax, 0xf // 4c | dec eax // 2bc9 | cwde // 4d | dec esp // 2bc8 | add eax, eax $sequence_15 = { 8bd8 488d442458 4839442450 740a 488d4c2450 e8???????? } // n = 6, score = 100 // 8bd8 | lea eax, [0xffffe147] // 488d442458 | dec edx // 4839442450 | mov edx, dword ptr [edi + ebx + 0x1818] // 740a | dec ebx // 488d4c2450 | cmp edx, dword ptr [edx + ebx] // e8???????? | $sequence_16 = { 4c 03d5 48 8bc6 4d 8d4803 48 } // n = 7, score = 100 // 4c | push edi // 03d5 | call esi // 48 | push eax // 8bc6 | push eax // 4d | pop ecx // 8d4803 | call edi // 48 | push edi $sequence_17 = { e9???????? 8d4ee0 e8???????? 84c0 740a b872140480 } // n = 6, score = 100 // e9???????? | // 8d4ee0 | lea ecx, [esi - 0x20] // e8???????? | // 84c0 | test al, al // 740a | je 0xc // b872140480 | mov eax, 0x80041472 $sequence_18 = { ff15???????? ba00010000 8d8df4fdffff 8bf2 } // n = 4, score = 100 // ff15???????? | // ba00010000 | mov edx, 0x100 // 8d8df4fdffff | lea ecx, [ebp - 0x20c] // 8bf2 | mov esi, edx $sequence_19 = { 741d 80791902 7217 488b4910 4c8d05d664ffff 448bcf 66ba1000 } // n = 7, score = 100 // 741d | jne 0x19 // 80791902 | int3 // 7217 | inc eax // 488b4910 | push ebx // 4c8d05d664ffff | dec eax // 448bcf | sub esp, 0x20 // 66ba1000 | dec eax $sequence_20 = { c20c00 6a00 6a00 6a01 68050000c0 ff15???????? } // n = 6, score = 100 // c20c00 | ret 0xc // 6a00 | push 0 // 6a00 | push 0 // 6a01 | push 1 // 68050000c0 | push 0xc0000005 // ff15???????? | $sequence_21 = { 85c0 7465 8d45f4 56 50 } // n = 5, score = 100 // 85c0 | test eax, eax // 7465 | je 0x67 // 8d45f4 | lea eax, [ebp - 0xc] // 56 | push esi // 50 | push eax $sequence_22 = { 83c00f 48 98 4c 03c0 4c } // n = 6, score = 100 // 83c00f | call esi // 48 | push eax // 98 | pop ecx // 4c | call esi // 03c0 | push eax // 4c | pop ecx $sequence_23 = { 890a 5d 8bc3 5b } // n = 4, score = 100 // 890a | mov dword ptr [edx], ecx // 5d | pop ebp // 8bc3 | mov eax, ebx // 5b | pop ebx $sequence_24 = { ff4d0c 75a2 8b45fc 83e800 746e 48 } // n = 6, score = 100 // ff4d0c | dec dword ptr [ebp + 0xc] // 75a2 | jne 0xffffffa4 // 8b45fc | mov eax, dword ptr [ebp - 4] // 83e800 | sub eax, 0 // 746e | je 0x70 // 48 | dec eax $sequence_25 = { 4156 4883ec50 4533f6 4d8be8 } // n = 4, score = 100 // 4156 | inc ecx // 4883ec50 | push esi // 4533f6 | dec eax // 4d8be8 | sub esp, 0x50 $sequence_26 = { 03d5 49 83f802 760b } // n = 4, score = 100 // 03d5 | call esi // 49 | push eax // 83f802 | pop ecx // 760b | call edi $sequence_27 = { 8bf7 8d840108100000 50 6a40 ff15???????? } // n = 5, score = 100 // 8bf7 | mov esi, edi // 8d840108100000 | lea eax, [ecx + eax + 0x1008] // 50 | push eax // 6a40 | push 0x40 // ff15???????? | $sequence_28 = { 8b7340 418bc4 4883feff 0f92c0 413bc4 750a } // n = 6, score = 100 // 8b7340 | dec eax // 418bc4 | mov eax, dword ptr [esi] // 4883feff | mov edx, 1 // 0f92c0 | dec eax // 413bc4 | mov ecx, esi // 750a | call dword ptr [eax] $sequence_29 = { 68???????? 50 e8???????? 57 8d8680bb0000 68???????? } // n = 6, score = 100 // 68???????? | // 50 | dec esp // e8???????? | // 57 | dec esp // 8d8680bb0000 | add edx, ebp // 68???????? | condition: 7 of them and filesize < 377856 }
rule win_ccleaner_backdoor_w0 { meta: author = "Florian Roth" reference = "https://goo.gl/puVc9q" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ccleaner_backdoor" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "\\spool\\prtprocs\\w32x86\\localspl.dll" fullword ascii $s2 = "\\spool\\prtprocs\\x64\\localspl.dll" fullword ascii $s3 = "\\msvcrt.dll" fullword ascii $s4 = "\\TSMSISrv.dll" fullword ascii condition: all of them }
import "pe" rule win_ccleaner_backdoor_w1 { meta: author = "Florian Roth" reference = "https://goo.gl/puVc9q" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.ccleaner_backdoor" malpedia_version = "20180301" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "Copyright (c) 2007 - 2011 Symantec Corporation" fullword wide $s2 = "\\\\.\\SYMEFA" fullword wide condition: all of them and pe.number_of_signatures == 0 }
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