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rule win_ccleaner_backdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2021-10-07" version = "1" description = "Detects win.ccleaner_backdoor." 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.ccleaner_backdoor" 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 = { 57 ffd6 50 ff15???????? 8b3d???????? 59 ffd7 } // n = 7, score = 200 // 57 | push edi // ffd6 | call esi // 50 | push eax // ff15???????? | // 8b3d???????? | // 59 | pop ecx // ffd7 | call edi $sequence_1 = { 750a b857000780 e9???????? e8???????? } // n = 4, score = 200 // 750a | jne 0xc // b857000780 | mov eax, 0x80070057 // e9???????? | // e8???????? | $sequence_2 = { 03c0 894340 8b7340 418bc4 } // n = 4, score = 100 // 03c0 | add dword ptr [esi + 0xc], eax // 894340 | dec eax // 8b7340 | mov edi, dword ptr [edi] // 418bc4 | dec ecx $sequence_3 = { 7504 33c0 c9 c3 8a11 305103 8b480c } // n = 7, score = 100 // 7504 | jne 6 // 33c0 | xor eax, eax // c9 | leave // c3 | ret // 8a11 | mov dl, byte ptr [ecx] // 305103 | xor byte ptr [ecx + 3], dl // 8b480c | mov ecx, dword ptr [eax + 0xc] $sequence_4 = { 8802 48 03d5 45 8a42fe } // n = 5, score = 100 // 8802 | jg 0xd // 48 | dec eax // 03d5 | mov ecx, dword ptr [edx] // 45 | dec eax // 8a42fe | mov eax, dword ptr [ecx] $sequence_5 = { 01461c 8b542424 85d2 7405 } // n = 4, score = 100 // 01461c | add dword ptr [esi + 0x1c], eax // 8b542424 | mov edx, dword ptr [esp + 0x24] // 85d2 | test edx, edx // 7405 | je 7 $sequence_6 = { 013d???????? 8b04b5d8970210 0500080000 3bc8 } // n = 4, score = 100 // 013d???????? | // 8b04b5d8970210 | mov eax, dword ptr [esi*4 + 0x100297d8] // 0500080000 | add eax, 0x800 // 3bc8 | cmp ecx, eax $sequence_7 = { 01442418 03c8 8954242c 8b542470 } // n = 4, score = 100 // 01442418 | add dword ptr [esp + 0x18], eax // 03c8 | add ecx, eax // 8954242c | mov dword ptr [esp + 0x2c], edx // 8b542470 | mov edx, dword ptr [esp + 0x70] $sequence_8 = { 013e 33c0 8b16 83c410 } // n = 4, score = 100 // 013e | add dword ptr [esi], edi // 33c0 | xor eax, eax // 8b16 | mov edx, dword ptr [esi] // 83c410 | add esp, 0x10 $sequence_9 = { e8???????? 884607 8d45ec 50 8d4608 50 897dec } // n = 7, score = 100 // e8???????? | // 884607 | mov byte ptr [esi + 7], al // 8d45ec | lea eax, dword ptr [ebp - 0x14] // 50 | push eax // 8d4608 | lea eax, dword ptr [esi + 8] // 50 | push eax // 897dec | mov dword ptr [ebp - 0x14], edi $sequence_10 = { 01cc cc 48895c2408 57 } // n = 4, score = 100 // 01cc | lock xadd dword ptr [edx + 0x10], eax // cc | add dword ptr [esi + 0xc], eax // 48895c2408 | dec eax // 57 | mov edi, dword ptr [edi] $sequence_11 = { 00cc cc 4057 4883ec50 4533db } // n = 5, score = 100 // 00cc | add ah, cl // cc | int3 // 4057 | inc eax // 4883ec50 | push edi // 4533db | dec eax $sequence_12 = { 01442424 eb30 8b4508 897518 } // n = 4, score = 100 // 01442424 | add dword ptr [esp + 0x24], eax // eb30 | jmp 0x32 // 8b4508 | mov eax, dword ptr [ebp + 8] // 897518 | mov dword ptr [ebp + 0x18], esi $sequence_13 = { 53 c1e008 03c7 53 50 56 } // n = 6, score = 100 // 53 | push ebx // c1e008 | shl eax, 8 // 03c7 | add eax, edi // 53 | push ebx // 50 | push eax // 56 | push esi $sequence_14 = { c7461854b40210 8b450c 6afd 894720 } // n = 4, score = 100 // c7461854b40210 | dec eax // 8b450c | mov eax, dword ptr [ecx] // 6afd | call dword ptr [eax + 8] // 894720 | dec eax $sequence_15 = { 8b45e8 3b450c 7413 6a32 } // n = 4, score = 100 // 8b45e8 | add eax, esi // 3b450c | test eax, eax // 7413 | jg 0xd // 6a32 | dec eax $sequence_16 = { 70a4 2ac7 7589 db3b } // n = 4, score = 100 // 70a4 | mov ecx, dword ptr [edx] // 2ac7 | dec eax // 7589 | mov eax, dword ptr [ecx] // db3b | call dword ptr [eax + 8] $sequence_17 = { 49 75f9 8b450c c9 c3 55 8bec } // n = 7, score = 100 // 49 | dec ecx // 75f9 | jne 0xfffffffb // 8b450c | mov eax, dword ptr [ebp + 0xc] // c9 | leave // c3 | ret // 55 | push ebp // 8bec | mov ebp, esp $sequence_18 = { 85c0 7532 2145f8 8b4508 8bf3 8db888000000 85f6 } // n = 7, score = 100 // 85c0 | test eax, eax // 7532 | jne 0x34 // 2145f8 | and dword ptr [ebp - 8], eax // 8b4508 | mov eax, dword ptr [ebp + 8] // 8bf3 | mov esi, ebx // 8db888000000 | lea edi, dword ptr [eax + 0x88] // 85f6 | test esi, esi $sequence_19 = { bf803e0000 57 68???????? 56 e8???????? } // n = 5, score = 100 // bf803e0000 | jg 0xd // 57 | dec eax // 68???????? | // 56 | mov ecx, dword ptr [edx] // e8???????? | $sequence_20 = { 49 8bcb 49 8d4001 49 } // n = 5, score = 100 // 49 | call dword ptr [eax + 8] // 8bcb | dec eax // 49 | mov ecx, dword ptr [ebx + 0x28] // 8d4001 | add eax, esi // 49 | test eax, eax $sequence_21 = { 00cc cc 4883ec28 488b11 } // n = 4, score = 100 // 00cc | add ah, cl // cc | int3 // 4883ec28 | inc eax // 488b11 | push edi $sequence_22 = { 01442454 03d1 294c2450 8b4c2410 } // n = 4, score = 100 // 01442454 | add dword ptr [esp + 0x54], eax // 03d1 | add edx, ecx // 294c2450 | sub dword ptr [esp + 0x50], ecx // 8b4c2410 | mov ecx, dword ptr [esp + 0x10] $sequence_23 = { 03c6 4863d0 4c8d0c12 4c8d4718 } // n = 4, score = 100 // 03c6 | int3 // 4863d0 | dec eax // 4c8d0c12 | mov dword ptr [esp + 8], ebx // 4c8d4718 | push edi $sequence_24 = { 012e 33c0 5f 5e 5d } // n = 5, score = 100 // 012e | add dword ptr [esi], ebp // 33c0 | xor eax, eax // 5f | pop edi // 5e | pop esi // 5d | pop ebp $sequence_25 = { 50 6a40 ffd3 8bf8 85ff 7509 56 } // n = 7, score = 100 // 50 | add eax, esi // 6a40 | test eax, eax // ffd3 | jg 0xd // 8bf8 | dec eax // 85ff | mov ecx, dword ptr [edx] // 7509 | dec eax // 56 | mov eax, dword ptr [ecx] $sequence_26 = { 59 7508 8818 40 49 } // n = 5, score = 100 // 59 | pop ecx // 7508 | jne 0xa // 8818 | mov byte ptr [eax], bl // 40 | inc eax // 49 | dec ecx $sequence_27 = { 01460c 488b3f 493bfc 0f8554ffffff } // n = 4, score = 100 // 01460c | dec eax // 488b3f | mov edx, dword ptr [ecx] // 493bfc | dec eax // 0f8554ffffff | sub edx, 0x18 $sequence_28 = { 03c6 85c0 7f09 488b0a } // n = 4, score = 100 // 03c6 | mov eax, esp // 85c0 | add eax, eax // 7f09 | mov dword ptr [ebx + 0x40], eax // 488b0a | mov esi, dword ptr [ebx + 0x40] $sequence_29 = { 55 8bec 81ec0c020000 53 8d45f4 } // n = 5, score = 100 // 55 | push ebp // 8bec | mov ebp, esp // 81ec0c020000 | sub esp, 0x20c // 53 | push ebx // 8d45f4 | lea eax, dword ptr [ebp - 0xc] 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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