Actor(s): Hacking Team, APT-C-34
There is no description at this point.
rule win_rcs_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2026-01-05" version = "1" description = "Detects win.rcs." 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.rcs" malpedia_rule_date = "20260105" malpedia_hash = "19b79e7cab4eaf532122e5b45a77dd8f6bb5cc79" malpedia_version = "20251219" 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 = { e8???????? 83c430 6aff 68???????? } // n = 4, score = 200 // e8???????? | // 83c430 | add esp, 0x30 // 6aff | push -1 // 68???????? | $sequence_1 = { 89442456 8944245a 8944245e 89442462 89442466 8944246a } // n = 6, score = 200 // 89442456 | mov dword ptr [esp + 0x56], eax // 8944245a | mov dword ptr [esp + 0x5a], eax // 8944245e | mov dword ptr [esp + 0x5e], eax // 89442462 | mov dword ptr [esp + 0x62], eax // 89442466 | mov dword ptr [esp + 0x66], eax // 8944246a | mov dword ptr [esp + 0x6a], eax $sequence_2 = { ff15???????? 5f 5e 5d 5b 33c0 } // n = 6, score = 200 // ff15???????? | // 5f | pop edi // 5e | pop esi // 5d | pop ebp // 5b | pop ebx // 33c0 | xor eax, eax $sequence_3 = { 85ff 0f84d4000000 57 e8???????? } // n = 4, score = 200 // 85ff | test edi, edi // 0f84d4000000 | je 0xda // 57 | push edi // e8???????? | $sequence_4 = { 40 68???????? 50 e8???????? 83c40c eb0d } // n = 6, score = 200 // 40 | inc eax // 68???????? | // 50 | push eax // e8???????? | // 83c40c | add esp, 0xc // eb0d | jmp 0xf $sequence_5 = { 6a00 6880000000 6a01 6a00 6a05 } // n = 5, score = 200 // 6a00 | push 0 // 6880000000 | push 0x80 // 6a01 | push 1 // 6a00 | push 0 // 6a05 | push 5 $sequence_6 = { 83fd03 7c89 8b7c243c 33ed } // n = 4, score = 100 // 83fd03 | cmp ebp, 3 // 7c89 | jl 0xffffff8b // 8b7c243c | mov edi, dword ptr [esp + 0x3c] // 33ed | xor ebp, ebp $sequence_7 = { 6a20 6a01 6a0a 6a11 ff5660 8bbedc000000 } // n = 6, score = 100 // 6a20 | push 0x20 // 6a01 | push 1 // 6a0a | push 0xa // 6a11 | push 0x11 // ff5660 | call dword ptr [esi + 0x60] // 8bbedc000000 | mov edi, dword ptr [esi + 0xdc] $sequence_8 = { 8bbedc000000 8bbf14120000 89da 81e2ffff0000 c1e204 } // n = 5, score = 100 // 8bbedc000000 | mov edi, dword ptr [esi + 0xdc] // 8bbf14120000 | mov edi, dword ptr [edi + 0x1214] // 89da | mov edx, ebx // 81e2ffff0000 | and edx, 0xffff // c1e204 | shl edx, 4 $sequence_9 = { 89473c 8b7d08 8b37 81c6a1010000 } // n = 4, score = 100 // 89473c | mov dword ptr [edi + 0x3c], eax // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b37 | mov esi, dword ptr [edi] // 81c6a1010000 | add esi, 0x1a1 $sequence_10 = { e8???????? 83c41c 8d4d80 83c8ff } // n = 4, score = 100 // e8???????? | // 83c41c | add esp, 0x1c // 8d4d80 | lea ecx, [ebp - 0x80] // 83c8ff | or eax, 0xffffffff $sequence_11 = { c9 c3 55 89e5 81ec04020000 } // n = 5, score = 100 // c9 | leave // c3 | ret // 55 | push ebp // 89e5 | mov ebp, esp // 81ec04020000 | sub esp, 0x204 $sequence_12 = { 81f2be387d15 e9???????? 8be5 c1cead } // n = 4, score = 100 // 81f2be387d15 | xor edx, 0x157d38be // e9???????? | // 8be5 | mov esp, ebp // c1cead | ror esi, 0xad $sequence_13 = { 83fd02 7c2d 8b07 8d54300c 3b11 7350 03c6 } // n = 7, score = 100 // 83fd02 | cmp ebp, 2 // 7c2d | jl 0x2f // 8b07 | mov eax, dword ptr [edi] // 8d54300c | lea edx, [eax + esi + 0xc] // 3b11 | cmp edx, dword ptr [ecx] // 7350 | jae 0x52 // 03c6 | add eax, esi $sequence_14 = { 898528f4fbff 8b86dc000000 833800 0f94c0 83e001 } // n = 5, score = 100 // 898528f4fbff | mov dword ptr [ebp - 0x40bd8], eax // 8b86dc000000 | mov eax, dword ptr [esi + 0xdc] // 833800 | cmp dword ptr [eax], 0 // 0f94c0 | sete al // 83e001 | and eax, 1 $sequence_15 = { 81f2d141ed35 f8 f5 d1ca } // n = 4, score = 100 // 81f2d141ed35 | xor edx, 0x35ed41d1 // f8 | clc // f5 | cmc // d1ca | ror edx, 1 $sequence_16 = { 817deca4000000 72c2 56 e8???????? } // n = 4, score = 100 // 817deca4000000 | cmp dword ptr [ebp - 0x14], 0xa4 // 72c2 | jb 0xffffffc4 // 56 | push esi // e8???????? | $sequence_17 = { ffb56cf4fbff ffb584f4fbff ffb5a0f9fbff 8b86dc000000 8b5020 03905c020000 52 } // n = 7, score = 100 // ffb56cf4fbff | push dword ptr [ebp - 0x40b94] // ffb584f4fbff | push dword ptr [ebp - 0x40b7c] // ffb5a0f9fbff | push dword ptr [ebp - 0x40660] // 8b86dc000000 | mov eax, dword ptr [esi + 0xdc] // 8b5020 | mov edx, dword ptr [eax + 0x20] // 03905c020000 | add edx, dword ptr [eax + 0x25c] // 52 | push edx condition: 7 of them and filesize < 11501568 }
rule win_rcs_w0 { meta: author = "Florian Roth" description = "Hacking Team Disclosure Sample - file elevator.exe" reference = "Hacking Team Disclosure elevator.c" date = "2015-07-07" hash = "40a10420b9d49f87527bc0396b19ec29e55e9109e80b52456891243791671c1c" hash = "92aec56a859679917dffa44bd4ffeb5a8b2ee2894c689abbbcbe07842ec56b8d" hash = "9261693b67b6e379ad0e57598602712b8508998c0cb012ca23139212ae0009a1" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rcs" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "CRTDLL.DLL" fullword ascii $x2 = "\\sysnative\\CI.dll" fullword ascii $x3 = "\\SystemRoot\\system32\\CI.dll" fullword ascii $x4 = "C:\\\\Windows\\\\Sysnative\\\\ntoskrnl.exe" fullword ascii /* PEStudio Blacklist: strings */ $s1 = "[*] traversing processes" fullword ascii /* PEStudio Blacklist: strings */ $s2 = "_getkprocess" fullword ascii /* PEStudio Blacklist: strings */ $s3 = "[*] LoaderConfig %p" fullword ascii /* PEStudio Blacklist: strings */ $s4 = "loader.obj" fullword ascii /* PEStudio Blacklist: strings */ $s5 = "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.1; WOW64; Trident/5.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3" ascii /* PEStudio Blacklist: strings */ $s6 = "[*] token restore" fullword ascii /* PEStudio Blacklist: strings */ $s7 = "elevator.obj" fullword ascii $s8 = "_getexport" fullword ascii /* PEStudio Blacklist: strings */ condition: uint16(0) == 0x5a4d and filesize < 3000KB and all of ($x*) and 3 of ($s*) }
rule win_rcs_w1 { meta: description = "Hacking Team Disclosure Sample - file ndisk.sys" author = "Florian Roth" reference = "https://www.virustotal.com/en/file/a03a6ed90b89945a992a8c69f716ec3c743fa1d958426f4c50378cca5bef0a01/analysis/1436184181/" date = "2015-07-07" hash = "cf5089752ba51ae827971272a5b761a4ab0acd84" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rcs" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s1 = "\\Registry\\Machine\\System\\ControlSet00%d\\services\\ndisk.sys" fullword wide $s2 = "\\Registry\\Machine\\System\\ControlSet00%d\\Enum\\Root\\LEGACY_NDISK.SYS" fullword wide $s3 = "\\Driver\\DeepFrz" fullword wide $s4 = "Microsoft Kernel Disk Manager" fullword wide $s5 = "ndisk.sys" fullword wide $s6 = "\\Device\\MSH4DEV1" fullword wide $s7 = "\\DosDevices\\MSH4DEV1" fullword wide $s8 = "built by: WinDDK" fullword wide condition: uint16(0) == 0x5a4d and filesize < 30KB and 6 of them }
If your designated proposal does not fit in any other category, feel free to write a free-text in the comment field below. Changes regarding references should be proposed on the Malpedia library page.
Your suggestion will be reviewed before being published. Thank you for contributing!
YYYY-MM-DD
YYYY-MM
YYYY
