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 = "2023-01-25" 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 = "20230124" malpedia_hash = "2ee0eebba83dce3d019a90519f2f972c0fcf9686" malpedia_version = "20230125" 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 = { 6880000000 6a01 6a00 6a05 6800000040 } // n = 5, score = 200 // 6880000000 | push 0x80 // 6a01 | push 1 // 6a00 | push 0 // 6a05 | push 5 // 6800000040 | push 0x40000000 $sequence_2 = { 8944245a 8944245e 89442462 89442466 8944246a } // n = 5, score = 200 // 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_3 = { e8???????? 83c430 6aff 68???????? } // n = 4, score = 200 // e8???????? | // 83c430 | add esp, 0x30 // 6aff | push -1 // 68???????? | $sequence_4 = { ff15???????? 85c0 740d ff15???????? 33c0 } // n = 5, score = 200 // ff15???????? | // 85c0 | test eax, eax // 740d | je 0xf // ff15???????? | // 33c0 | xor eax, eax $sequence_5 = { 85ff 0f84d4000000 57 e8???????? } // n = 4, score = 200 // 85ff | test edi, edi // 0f84d4000000 | je 0xda // 57 | push edi // e8???????? | $sequence_6 = { 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_7 = { 8b7dfc c1e704 8b75f8 83c604 0fb77c3706 8b75e8 0fb7f6 } // n = 7, score = 100 // 8b7dfc | mov edi, dword ptr [ebp - 4] // c1e704 | shl edi, 4 // 8b75f8 | mov esi, dword ptr [ebp - 8] // 83c604 | add esi, 4 // 0fb77c3706 | movzx edi, word ptr [edi + esi + 6] // 8b75e8 | mov esi, dword ptr [ebp - 0x18] // 0fb7f6 | movzx esi, si $sequence_8 = { 89471c 8b7d08 8b37 81c6bb010000 56 ff75fc ff5704 } // n = 7, score = 100 // 89471c | mov dword ptr [edi + 0x1c], eax // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b37 | mov esi, dword ptr [edi] // 81c6bb010000 | add esi, 0x1bb // 56 | push esi // ff75fc | push dword ptr [ebp - 4] // ff5704 | call dword ptr [edi + 4] $sequence_9 = { 898534f4fbff 8b8538f4fbff 8b9534f4fbff 8d441004 8b00 89856cfffbff } // n = 6, score = 100 // 898534f4fbff | mov dword ptr [ebp - 0x40bcc], eax // 8b8538f4fbff | mov eax, dword ptr [ebp - 0x40bc8] // 8b9534f4fbff | mov edx, dword ptr [ebp - 0x40bcc] // 8d441004 | lea eax, [eax + edx + 4] // 8b00 | mov eax, dword ptr [eax] // 89856cfffbff | mov dword ptr [ebp - 0x40094], eax $sequence_10 = { ff5704 894744 8b7d08 8b37 } // n = 4, score = 100 // ff5704 | call dword ptr [edi + 4] // 894744 | mov dword ptr [edi + 0x44], eax // 8b7d08 | mov edi, dword ptr [ebp + 8] // 8b37 | mov esi, dword ptr [edi] $sequence_11 = { 81c1eb5c773b 660f48c9 660fbbce 8d359c937200 6681d19b3b } // n = 5, score = 100 // 81c1eb5c773b | add ecx, 0x3b775ceb // 660f48c9 | cmovs cx, cx // 660fbbce | btc si, cx // 8d359c937200 | lea esi, [0x72939c] // 6681d19b3b | adc cx, 0x3b9b $sequence_12 = { 83f804 7650 bffbffffff 2bfd } // n = 4, score = 100 // 83f804 | cmp eax, 4 // 7650 | jbe 0x52 // bffbffffff | mov edi, 0xfffffffb // 2bfd | sub edi, ebp $sequence_13 = { 50 e8???????? 83c408 57 8d8500feffff 50 } // n = 6, score = 100 // 50 | push eax // e8???????? | // 83c408 | add esp, 8 // 57 | push edi // 8d8500feffff | lea eax, [ebp - 0x200] // 50 | push eax $sequence_14 = { 81c639010000 56 ff75e4 ff5704 894728 8b7d08 } // n = 6, score = 100 // 81c639010000 | add esi, 0x139 // 56 | push esi // ff75e4 | push dword ptr [ebp - 0x1c] // ff5704 | call dword ptr [edi + 4] // 894728 | mov dword ptr [edi + 0x28], eax // 8b7d08 | mov edi, dword ptr [ebp + 8] $sequence_15 = { 8b86dc000000 ffb010120000 ff565c 8b86dc000000 833800 } // n = 5, score = 100 // 8b86dc000000 | mov eax, dword ptr [esi + 0xdc] // ffb010120000 | push dword ptr [eax + 0x1210] // ff565c | call dword ptr [esi + 0x5c] // 8b86dc000000 | mov eax, dword ptr [esi + 0xdc] // 833800 | cmp dword ptr [eax], 0 $sequence_16 = { 0fbe1f 3b5d0c 7506 8b7d08 897dfc 8b7d08 } // n = 6, score = 100 // 0fbe1f | movsx ebx, byte ptr [edi] // 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] 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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