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 = "2024-10-31" 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 = "20241030" malpedia_hash = "26e26953c49c8efafbf72a38076855d578e0a2e4" malpedia_version = "20241030" 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 = { 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_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 = { 85ff 0f84d4000000 57 e8???????? } // n = 4, score = 200 // 85ff | test edi, edi // 0f84d4000000 | je 0xda // 57 | push edi // e8???????? | $sequence_3 = { e8???????? 83c430 6aff 68???????? } // n = 4, score = 200 // e8???????? | // 83c430 | add esp, 0x30 // 6aff | push -1 // 68???????? | $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 = { 6a01 6a00 6a05 6800000040 } // n = 4, score = 200 // 6a01 | push 1 // 6a00 | push 0 // 6a05 | push 5 // 6800000040 | push 0x40000000 $sequence_6 = { 81f1ff2fe523 85cd f9 33d9 } // n = 4, score = 100 // 81f1ff2fe523 | xor ecx, 0x23e52fff // 85cd | test ebp, ecx // f9 | stc // 33d9 | xor ebx, ecx $sequence_7 = { 83e001 48 83e004 83c004 } // n = 4, score = 100 // 83e001 | and eax, 1 // 48 | dec eax // 83e004 | and eax, 4 // 83c004 | add eax, 4 $sequence_8 = { 6a6e ff5760 8bb7dc000000 898610120000 5f 5e c9 } // n = 7, score = 100 // 6a6e | push 0x6e // ff5760 | call dword ptr [edi + 0x60] // 8bb7dc000000 | mov esi, dword ptr [edi + 0xdc] // 898610120000 | mov dword ptr [esi + 0x1210], eax // 5f | pop edi // 5e | pop esi // c9 | leave $sequence_9 = { 3b5d0c 7506 8b7d08 897dfc 8b7d08 89fe } // n = 6, score = 100 // 3b5d0c | cmp ebx, dword ptr [ebp + 0xc] // 7506 | jne 8 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 897dfc | mov dword ptr [ebp - 4], edi // 8b7d08 | mov edi, dword ptr [ebp + 8] // 89fe | mov esi, edi $sequence_10 = { c78578fffbff06000000 c7857cfffbff00000100 c78588fffbff00028004 8365ec00 8d8518fffbff } // n = 5, score = 100 // c78578fffbff06000000 | mov dword ptr [ebp - 0x40088], 6 // c7857cfffbff00000100 | mov dword ptr [ebp - 0x40084], 0x10000 // c78588fffbff00028004 | mov dword ptr [ebp - 0x40078], 0x4800200 // 8365ec00 | and dword ptr [ebp - 0x14], 0 // 8d8518fffbff | lea eax, [ebp - 0x400e8] $sequence_11 = { 0508070000 50 ff96b8000000 43 83fb0f 72dd } // n = 6, score = 100 // 0508070000 | add eax, 0x708 // 50 | push eax // ff96b8000000 | call dword ptr [esi + 0xb8] // 43 | inc ebx // 83fb0f | cmp ebx, 0xf // 72dd | jb 0xffffffdf $sequence_12 = { 81f20c055354 66f7c54b45 f5 6681fca14f } // n = 4, score = 100 // 81f20c055354 | xor edx, 0x5453050c // 66f7c54b45 | test bp, 0x454b // f5 | cmc // 6681fca14f | cmp sp, 0x4fa1 $sequence_13 = { 83fb01 741d 83fb02 7418 83fb03 7413 } // n = 6, score = 100 // 83fb01 | cmp ebx, 1 // 741d | je 0x1f // 83fb02 | cmp ebx, 2 // 7418 | je 0x1a // 83fb03 | cmp ebx, 3 // 7413 | je 0x15 $sequence_14 = { 740c c785a0f9fbff00e0ffff eb0a c785a0f9fbff80faffff ffb5a0f9fbff } // n = 5, score = 100 // 740c | je 0xe // c785a0f9fbff00e0ffff | mov dword ptr [ebp - 0x40660], 0xffffe000 // eb0a | jmp 0xc // c785a0f9fbff80faffff | mov dword ptr [ebp - 0x40660], 0xfffffa80 // ffb5a0f9fbff | push dword ptr [ebp - 0x40660] $sequence_15 = { ffb5a0f9fbff 8b86dc000000 8b5020 8b805c020000 } // n = 4, score = 100 // ffb5a0f9fbff | push dword ptr [ebp - 0x40660] // 8b86dc000000 | mov eax, dword ptr [esi + 0xdc] // 8b5020 | mov edx, dword ptr [eax + 0x20] // 8b805c020000 | mov eax, dword ptr [eax + 0x25c] $sequence_16 = { 8b7d08 8b37 81c608020000 56 ff75fc ff5704 894764 } // n = 7, score = 100 // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b37 | mov esi, dword ptr [edi] // 81c608020000 | add esi, 0x208 // 56 | push esi // ff75fc | push dword ptr [ebp - 4] // ff5704 | call dword ptr [edi + 4] // 894764 | mov dword ptr [edi + 0x64], eax $sequence_17 = { 83fb01 750e 8b463c 8d5640 } // n = 4, score = 100 // 83fb01 | cmp ebx, 1 // 750e | jne 0x10 // 8b463c | mov eax, dword ptr [esi + 0x3c] // 8d5640 | lea edx, [esi + 0x40] 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 }
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