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rule win_ccleaner_backdoor_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2022-08-05" 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 = "20220805" malpedia_hash = "6ec06c64bcfdbeda64eff021c766b4ce34542b71" malpedia_version = "20220808" 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???????? } // n = 5, score = 200 // 57 | push edi // ffd6 | call esi // 50 | push eax // ff15???????? | // 8b3d???????? | $sequence_1 = { ff15???????? 8b3d???????? 59 ffd7 } // n = 4, score = 200 // ff15???????? | // 8b3d???????? | // 59 | pop ecx // ffd7 | call edi $sequence_2 = { 750a b857000780 e9???????? e8???????? } // n = 4, score = 200 // 750a | jne 0xc // b857000780 | mov eax, 0x80070057 // e9???????? | // e8???????? | $sequence_3 = { 50 897dec ff15???????? 8d45ec 897dec 50 8d4648 } // n = 7, score = 100 // 50 | push eax // 897dec | mov dword ptr [ebp - 0x14], edi // ff15???????? | // 8d45ec | lea eax, [ebp - 0x14] // 897dec | mov dword ptr [ebp - 0x14], edi // 50 | push eax // 8d4648 | lea eax, [esi + 0x48] $sequence_4 = { 83c40c 385e06 740f 8d45f8 6a01 50 } // n = 6, score = 100 // 83c40c | add esp, 0xc // 385e06 | cmp byte ptr [esi + 6], bl // 740f | je 0x11 // 8d45f8 | lea eax, [ebp - 8] // 6a01 | push 1 // 50 | push eax $sequence_5 = { c70309000000 c7461854b40210 8b450c 6afd 894720 } // n = 5, score = 100 // c70309000000 | mov dword ptr [ebx], 9 // c7461854b40210 | mov dword ptr [esi + 0x18], 0x1002b454 // 8b450c | mov eax, dword ptr [ebp + 0xc] // 6afd | push -3 // 894720 | mov dword ptr [edi + 0x20], eax $sequence_6 = { 8d86803e0000 68???????? 50 e8???????? 689c140000 8d86007d0000 68???????? } // n = 7, score = 100 // 8d86803e0000 | lea eax, [esi + 0x3e80] // 68???????? | // 50 | push eax // e8???????? | // 689c140000 | push 0x149c // 8d86007d0000 | lea eax, [esi + 0x7d00] // 68???????? | $sequence_7 = { 85f6 0f84a8000000 bf803e0000 57 68???????? 56 } // n = 6, score = 100 // 85f6 | test esi, esi // 0f84a8000000 | je 0xae // bf803e0000 | mov edi, 0x3e80 // 57 | push edi // 68???????? | // 56 | push esi $sequence_8 = { 01442418 03c8 8954242c 8b542470 } // n = 4, score = 100 // 01442418 | dec eax // 03c8 | mov edx, dword ptr [ebx + 0x48] // 8954242c | add eax, esi // 8b542470 | test eax, eax $sequence_9 = { 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_10 = { 01442424 eb30 8b4508 897518 } // n = 4, score = 100 // 01442424 | xor eax, eax // eb30 | pop edi // 8b4508 | pop esi // 897518 | pop ebp $sequence_11 = { 03c6 4863d0 4c8d0c12 4c8d4718 } // n = 4, score = 100 // 03c6 | int3 // 4863d0 | dec eax // 4c8d0c12 | mov dword ptr [esp + 8], ebx // 4c8d4718 | push edi $sequence_12 = { c7857cfdffffef08d357 c78580fdffff90d50000 e8???????? 8d856cffffff } // n = 4, score = 100 // c7857cfdffffef08d357 | mov dword ptr [ebp - 0x284], 0x57d308ef // c78580fdffff90d50000 | mov dword ptr [ebp - 0x280], 0xd590 // e8???????? | // 8d856cffffff | lea eax, [ebp - 0x94] $sequence_13 = { 49 83f810 4c 8bca 0f82f9000000 41 8ac0 } // n = 7, score = 100 // 49 | dec ecx // 83f810 | cmp eax, 0x10 // 4c | dec esp // 8bca | mov ecx, edx // 0f82f9000000 | jb 0xff // 41 | inc ecx // 8ac0 | mov al, al $sequence_14 = { 00cc cc 4883ec28 488b11 } // n = 4, score = 100 // 00cc | add ah, cl // cc | int3 // 4883ec28 | inc eax // 488b11 | push edi $sequence_15 = { 41 8a01 8802 41 8a0429 48 } // n = 6, score = 100 // 41 | inc ecx // 8a01 | mov al, byte ptr [ecx] // 8802 | mov byte ptr [edx], al // 41 | inc ecx // 8a0429 | mov al, byte ptr [ecx + ebp] // 48 | dec eax $sequence_16 = { 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_17 = { 5e c60000 40 49 75f9 8b4508 c9 } // n = 7, score = 100 // 5e | pop esi // c60000 | mov byte ptr [eax], 0 // 40 | inc eax // 49 | dec ecx // 75f9 | jne 0xfffffffb // 8b4508 | mov eax, dword ptr [ebp + 8] // c9 | leave $sequence_18 = { 01442454 03d1 294c2450 8b4c2410 } // n = 4, score = 100 // 01442454 | cmp ecx, eax // 03d1 | jae 0x2d // 294c2450 | mov eax, dword ptr [esi*4 + 0x100297d8] // 8b4c2410 | add eax, 0x800 $sequence_19 = { 75f7 e9???????? 0fb601 c1e002 8bfa 2bf8 } // n = 6, score = 100 // 75f7 | jne 0xfffffff9 // e9???????? | // 0fb601 | movzx eax, byte ptr [ecx] // c1e002 | shl eax, 2 // 8bfa | mov edi, edx // 2bf8 | sub edi, eax $sequence_20 = { 03c6 85c0 7f09 488b0a 488b01 ff5008 488b4b28 } // n = 7, score = 100 // 03c6 | mov eax, esp // 85c0 | add eax, eax // 7f09 | mov dword ptr [ebx + 0x40], eax // 488b0a | mov esi, dword ptr [ebx + 0x40] // 488b01 | inc ecx // ff5008 | mov eax, esp // 488b4b28 | dec eax $sequence_21 = { 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_22 = { 012e 33c0 5f 5e 5d } // n = 5, score = 100 // 012e | dec eax // 33c0 | arpl ax, dx // 5f | dec esp // 5e | lea ecx, [edx + edx] // 5d | dec esp $sequence_23 = { 8d45f4 bbfe000000 897d10 50 8d856cfcffff 50 } // n = 6, score = 100 // 8d45f4 | lea eax, [ebp - 0xc] // bbfe000000 | mov ebx, 0xfe // 897d10 | mov dword ptr [ebp + 0x10], edi // 50 | push eax // 8d856cfcffff | lea eax, [ebp - 0x394] // 50 | push eax $sequence_24 = { 013d???????? 8b04b5d8970210 0500080000 3bc8 } // n = 4, score = 100 // 013d???????? | // 8b04b5d8970210 | lea ecx, [ebx + 0x18] // 0500080000 | add eax, esi // 3bc8 | dec eax $sequence_25 = { 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_26 = { 013e 33c0 8b16 83c410 } // n = 4, score = 100 // 013e | mov eax, dword ptr [ecx] // 33c0 | call dword ptr [eax + 8] // 8b16 | dec eax // 83c410 | mov ecx, dword ptr [ebx + 0x28] $sequence_27 = { 01461c 8b542424 85d2 7405 } // n = 4, score = 100 // 01461c | add dword ptr [esi], edi // 8b542424 | xor eax, eax // 85d2 | mov edx, dword ptr [esi] // 7405 | add esp, 0x10 $sequence_28 = { 7515 ff45fc 8a19 49 80fb3d 74f5 } // n = 6, score = 100 // 7515 | jne 0x17 // ff45fc | inc dword ptr [ebp - 4] // 8a19 | mov bl, byte ptr [ecx] // 49 | dec ecx // 80fb3d | cmp bl, 0x3d // 74f5 | je 0xfffffff7 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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