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rule win_rombertik_auto { meta: author = "Felix Bilstein - yara-signator at cocacoding dot com" date = "2023-07-11" version = "1" description = "Detects win.rombertik." 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.rombertik" malpedia_rule_date = "20230705" malpedia_hash = "42d0574f4405bd7d2b154d321d345acb18834a41" malpedia_version = "20230715" 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 = { 46 0fb68c3500ffffff 03f9 81e7ff000080 } // n = 4, score = 200 // 46 | inc esi // 0fb68c3500ffffff | movzx ecx, byte ptr [ebp + esi - 0x100] // 03f9 | add edi, ecx // 81e7ff000080 | and edi, 0x800000ff $sequence_1 = { 53 56 57 b940010000 8d85b4feffff } // n = 5, score = 200 // 53 | push ebx // 56 | push esi // 57 | push edi // b940010000 | mov ecx, 0x140 // 8d85b4feffff | lea eax, [ebp - 0x14c] $sequence_2 = { 2bf8 83ef05 c60406e9 897c0601 } // n = 4, score = 200 // 2bf8 | sub edi, eax // 83ef05 | sub edi, 5 // c60406e9 | mov byte ptr [esi + eax], 0xe9 // 897c0601 | mov dword ptr [esi + eax + 1], edi $sequence_3 = { 85c0 0f8406010000 53 56 8b35???????? 57 } // n = 6, score = 200 // 85c0 | test eax, eax // 0f8406010000 | je 0x10c // 53 | push ebx // 56 | push esi // 8b35???????? | // 57 | push edi $sequence_4 = { 85c0 743b 807dfee9 7435 56 } // n = 5, score = 200 // 85c0 | test eax, eax // 743b | je 0x3d // 807dfee9 | cmp byte ptr [ebp - 2], 0xe9 // 7435 | je 0x37 // 56 | push esi $sequence_5 = { 8b35???????? 6a00 6a01 6a00 6a00 8d45fc } // n = 6, score = 200 // 8b35???????? | // 6a00 | push 0 // 6a01 | push 1 // 6a00 | push 0 // 6a00 | push 0 // 8d45fc | lea eax, [ebp - 4] $sequence_6 = { ffd6 85c0 740f 8d95acfdffff 52 } // n = 5, score = 200 // ffd6 | call esi // 85c0 | test eax, eax // 740f | je 0x11 // 8d95acfdffff | lea edx, [ebp - 0x254] // 52 | push edx $sequence_7 = { 8d8df8feffff 51 c745fc04010000 ff15???????? } // n = 4, score = 200 // 8d8df8feffff | lea ecx, [ebp - 0x108] // 51 | push ecx // c745fc04010000 | mov dword ptr [ebp - 4], 0x104 // ff15???????? | $sequence_8 = { 8b5508 8b7510 03d7 8ac3 2bf1 3c78 } // n = 6, score = 200 // 8b5508 | mov edx, dword ptr [ebp + 8] // 8b7510 | mov esi, dword ptr [ebp + 0x10] // 03d7 | add edx, edi // 8ac3 | mov al, bl // 2bf1 | sub esi, ecx // 3c78 | cmp al, 0x78 $sequence_9 = { 50 52 8d85f4feffff 57 50 e8???????? } // n = 6, score = 200 // 50 | push eax // 52 | push edx // 8d85f4feffff | lea eax, [ebp - 0x10c] // 57 | push edi // 50 | push eax // e8???????? | condition: 7 of them and filesize < 73728 }
rule win_rombertik_w0 { meta: author = "Florian Roth" description = "Detects CarbonGrabber alias Rombertik - file Copy#064046.scr" reference = "http://blogs.cisco.com/security/talos/rombertik" date = "2015-05-05" hash = "2f9b26b90311e62662c5946a1ac600d2996d3758" hash = "aeb94064af2a6107a14fd32f39cb502e704cd0ab" hash = "c2005c8d1a79da5e02e6a15d00151018658c264c" hash = "98223d4ec272d3a631498b621618d875dd32161d" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rombertik" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $x1 = "ZwGetWriteWatch" fullword ascii $x2 = "OutputDebugStringA" fullword ascii $x3 = "malwar" fullword ascii $x4 = "sampl" fullword ascii $x5 = "viru" fullword ascii $x6 = "sandb" fullword ascii condition: uint16(0) == 0x5a4d and filesize < 5MB and all of them }
rule win_rombertik_w1 { meta: description = "Detects CarbonGrabber alias Rombertik panel install script - file install.php" author = "Florian Roth" reference = "http://blogs.cisco.com/security/talos/rombertik" date = "2015-05-05" hash = "cd6c152dd1e0689e0bede30a8bd07fef465fbcfa" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rombertik" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s0 = "$insert = \"INSERT INTO `logs` (`id`, `ip`, `name`, `host`, `post`, `time`, `bro" ascii $s3 = "`post` text NOT NULL," fullword ascii $s4 = "`host` text NOT NULL," fullword ascii $s5 = ") ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=5 ;\" ;" fullword ascii $s6 = "$db->exec($columns); //or die(print_r($db->errorInfo(), true));;" fullword ascii $s9 = "$db->exec($insert);" fullword ascii $s10 = "`browser` text NOT NULL," fullword ascii $s13 = "`ip` text NOT NULL," fullword ascii condition: filesize < 3KB and all of them }
rule win_rombertik_w2 { meta: description = "Detects CarbonGrabber alias Rombertik Panel - file index.php" author = "Florian Roth" reference = "http://blogs.cisco.com/security/talos/rombertik" date = "2015-05-05" hash = "e6e9e4fc3772ff33bbeeda51f217e9149db60082" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rombertik" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s0 = "echo '<meta http-equiv=\"refresh\" content=\"0;url=index.php?a=login\">';" fullword ascii $s1 = "echo '<meta http-equiv=\"refresh\" content=\"2;url='.$website.'/index.php?a=login" ascii $s2 = "header(\"location: $website/index.php?a=login\");" fullword ascii $s3 = "$insertLogSQL -> execute(array(':id' => NULL, ':ip' => $ip, ':name' => $name, ':" ascii $s16 = "if($_POST['username'] == $username && $_POST['password'] == $password){" fullword ascii $s17 = "$SQL = $db -> prepare(\"TRUNCATE TABLE `logs`\");" fullword ascii condition: filesize < 46KB and all of them }
rule win_rombertik_w3 { meta: description = "Detects CarbonGrabber alias Rombertik Builder - file Builder.exe" author = "Florian Roth" reference = "http://blogs.cisco.com/security/talos/rombertik" date = "2015-05-05" hash = "b50ecc0ba3d6ec19b53efe505d14276e9e71285f" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rombertik" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s0 = "c:\\users\\iden\\documents\\visual studio 2010\\Projects\\FormGrabberBuilderC++" ascii $s1 = "Host(www.panel.com): " fullword ascii $s2 = "Path(/form/index.php?a=insert): " fullword ascii $s3 = "FileName: " fullword ascii $s4 = "~Rich8" fullword ascii condition: uint16(0) == 0x5a4d and filesize < 35KB and all of them }
rule win_rombertik_w4 { meta: description = "Detects CarbonGrabber alias Rombertik Builder Server - file Server.exe" author = "Florian Roth" reference = "http://blogs.cisco.com/security/talos/rombertik" date = "2015-05-05" hash = "895fab8d55882eac51d4b27a188aa67205ff0ae5" malpedia_reference = "https://malpedia.caad.fkie.fraunhofer.de/details/win.rombertik" malpedia_version = "20170521" malpedia_license = "CC BY-NC-SA 4.0" malpedia_sharing = "TLP:WHITE" strings: $s0 = "C:\\WINDOWS\\system32\\svchost.exe" fullword ascii $s3 = "Software\\Microsoft\\Windows\\Currentversion\\RunOnce" fullword ascii $s4 = "chrome.exe" fullword ascii $s5 = "firefox.exe" fullword ascii $s6 = "chrome.dll" fullword ascii $s7 = "@KERNEL32.DLL" fullword wide $s8 = "Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome" ascii $s10 = "&post=" fullword ascii $s11 = "&host=" fullword ascii $s12 = "Ws2_32.dll" fullword ascii $s16 = "&browser=" fullword ascii condition: uint16(0) == 0x5a4d and filesize < 250KB and 8 of them }
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