MAR-10382580-r2.v1 – RAT

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This document is marked TLP:WHITE--Disclosure is not limited. Sources may use TLP:WHITE when information carries minimal or no foreseeable risk of misuse, in accordance with applicable rules and procedures for public release. Subject to standard copyright rules, TLP:WHITE information may be distributed without restriction. For more information on the Traffic Light Protocol (TLP), see http://www.cisa.gov/tlp.

Description

This CISA submission included one unique file. This file is a malicious loader that contains an embedded executable. This embedded executable is a Remote Access Tool (RAT) that provides a vast array of Command and Control (C2) capabilities. These C2 capabilities include the ability to remotely monitor a system's desktop, gain reverse shell access, exfiltrate data, and upload and execute additional payloads. The malware can also function as a proxy, allowing a remote operator to pivot to other systems.

For a downloadable copy of IOCs, see: MAR-10382580.r2.v1.WHITE_stix

Submitted Files (1)

4cd7efdb1a7ac8c4387c515a7b1925931beb212b95c4f9d8b716dbe18f54624f (ilasvc.exe)

IPs (1)

151.106.30.120

4cd7efdb1a7ac8c4387c515a7b1925931beb212b95c4f9d8b716dbe18f54624f

Tags

remote-access-trojantrojan

Details

Antivirus

YARA Rules

• rule CISA_10382580_03 : loader
  {
     meta:
         Author = "CISA Code & Media Analysis"
         Incident = "10382580"
         Date = "2022-05-02"
         Last_Modified = "20220602_1200"
         Actor = "n/a"
         Category = "Loader"
         Family = "n/a"
         Description = "Detects loader samples"
         MD5_1 = "3764a0f1762a294f662f3bf86bac776f"
         SHA256_1 = "f7f7b059b6a7dbd75b30b685b148025a0d4ceceab405e553ca28cacdeae43fab"
         MD5_2 = "21fa1a043460c14709ef425ce24da4fd"
         SHA256_2 = "66966ceae7e3a8aace6c27183067d861f9d7267aed30473a95168c3fe19f2c16"
         MD5_3 = "e9c2b8bd1583baf3493824bf7b3ec51e"
         SHA256_3 = "7ea294d30903c0ab690bc02b64b20af0cfe66a168d4622e55dee4d6233783751"
         MD5_4 = "de0d57bdc10fee1e1e16e225788bb8de"
         SHA256_4 = "33b89b8915aaa59a3c9db23343e8c249b2db260b9b10e88593b6ff2fb5f71d2b"
         MD5_5 = "9b071311ecd1a72bfd715e34dbd1bd77"
         SHA256_5 = "3c2c835042a05f8d974d9b35b994bcf8d5a0ce19128ebb362804c2d0f3eb42c0"
         MD5_6 = "05d38bc82d362dd57190e3cb397f807d"
         SHA256_6 = "4cd7efdb1a7ac8c4387c515a7b1925931beb212b95c4f9d8b716dbe18f54624f"
     strings:
         $s0 = { B8 01 00 00 00 48 6B C0 00 C6 44 04 20 A8 B8 01 }
         $s1 = { 00 00 48 6B C0 01 C6 44 04 20 9A B8 01 00 00 }
         $s2 = { 48 6B C0 02 C6 44 04 20 93 B8 01 00 00 00 48 }
         $s3 = { C0 03 C6 44 04 20 9B B8 01 00 00 00 48 6B C0 }
     condition:
         all of them
  }

ssdeep Matches

No matches found.

PE Metadata

PE Sections

Relationships

Description

This malware is a 64-bit Windows loader that contains an embedded encrypted malicious executable. During runtime, this embedded executable is decrypted and loaded into memory, never touching the system's hard disk. The encrypted executable is similar in functionality to the file 66966ceae7e3a8aace6c27183067d861f9d7267aed30473a95168c3fe19f2c16, described in report MAR-10382580.r1.v1. The malware embedded within this loader attempts to communicate with the hard-coded C2 Internet Protocol (IP) address 151[.]106[.]30[.]120. This malware provides a vast array of C2 capabilities including the ability to log keystrokes, upload and execute additional payloads, function as a proxy, and have graphical user interface (GUI) access over a target Windows system's desktop. Many of the structures utilized to implement the C2 capabilities in this malware appear to be derived from the same source code as 66966ceae7e3a8aace6c27183067d861f9d7267aed30473a95168c3fe19f2c16, however this malware utilizes much more complex obfuscation to hinder the analysis of its code structures. This malware also utilizes a more complex encryption algorithm to secure its network communications.

The malware embedded within this binary utilizes a secure strings scheme based on a rotating XOR cipher (Figure 7). The strings are partially decrypted and listed below with their corresponding approximate memory address locations during runtime -- assuming a base address of 0x260000.

--Begin Decoded Strings--

('0x264e32', 'RegQueryValueExl')
('0x264f58', 'RegQueryValueEx\\')
('0x265325', 'GetCurrentProcessId')
('0x265bc9', 'GetEnvironmentVariableW')
('0x265cc1', 'ShellExecuteExW')
('0x268b20', 'GetAdaptersInfo')
('0x268c49', 'GetAdaptersInfo')
('0x26a77c', 'EnumDependentServicesW')
('0x26a98b', 'EnumDependentServi')
('0x26abb9', 'ControlService')
('0x26ad5b', 'QueryServiceStatus')
('0x26af62', 'CloseServiceHandle')
('0x26c3ed', 'GetComputerNameW')
('0x277621', 'GetEnvironmentVariableW')
('0x27856f', 'GetLogicalDriveStringsW')
('0x2788e5', 'GetVolumeInformationW')
('0x278f87', 'FindFirstFileW')
('0x27a3f3', 'GetSystemDirectoryW')
('0x27bf04', 'SetFilePointerEx')
('0x27d125', 'RemoveDirectoryW')
('0x27daa7', 'FindFirstFileW')
('0x284074', 'GetClipboardData')
('0x2850d4', 'GetForegroundWindow')
('0x28513d', 'GetDesktopWindow')
('0x28b443', 'GetProcessHeap')
('0x28b533', 'CoInitializeEx')
('0x28b655', 'StartServiceCtrlDispatch')
('0x28cd63', 'GetModuleFileNameW')
('0x2636f3', 'UnkownError')
('0x2649f3', "Display''''")
('0x264ab0', 'RegOpenKeyExW')
('0x264af0', 'ADVAPI32.dll')
('0x264ca0', 'RegEnumKeyExW')
('0x264ce0', 'ADVAPI32.dll')
('0x264d80', 'RegOpenKeyExW')
('0x264dc0', 'ADVAPI32.dll')
('0x264e90', 'ADVAPI32.dll')
('0x264fb0', 'ADVAPI32.dll')
('0x265160', 'RegCloseKey')
('0x2651b0', 'ADVAPI32.dll')
('0x265390', 'KERNEL32.dll')
('0x265c30', 'KERNEL32.dll')
('0x265d20', 'SHELL32.dll')
('0x266950', 'GetVersionExW')
('0x266990', 'KERNEL32.dll')
('0x266b63', 'CurrentMajorVersionNum')
('0x266c33', 'CurrentMajorVersionNum')
('0x268b80', 'IPHLPAPI.dll')
('0x268c03', 'KERNEL32.dll')
('0x268ca0', 'IPHLPAPI.dll')
('0x26a710', 'GetTickCount')
('0x26a750', 'KERNEL32.dll')
('0x26a7b8', 'EnumDepende')
('0x26a7f3', 'Advapi32.dll')
('0x26a872', 'GetLastError')
('0x26a8b0', 'KERNEL32.dll')
('0x26a940', 'KERNEL32.dll')
('0x26aa17', 'Advapi32.dll')
('0x26aafb', 'OpenServiceW')
('0x26ab4b', 'Advapi32.dll')
('0x26ac33', 'Advapi32.dll')
('0x26acd4', 'Sleep')
('0x26ad24', 'KERNEL32.dll')
('0x26adea', 'Advapi32.dll')
('0x26aeaa', 'GetTickCount')
('0x26af03', 'KERNEL32.dll')
('0x26afdb', 'Advapi32.dll')
('0x26c2e0', 'GetUserNameW')
('0x26c320', 'Advapi32.dll')
('0x26c450', 'KERNEL32.dll')
('0x26cad0', 'KERNEL32.dll')
('0x273220', 'closesocket')
('0x274a90', 'getsockname')
('0x275280', 'getsockname')
('0x276583', 'Erroroccurswhiles')
('0x276714', 'NoTabsinclient.')
('0x2769e3', 'NoTabsinclient.')
('0x276b60', 'KERNEL32.dll')
('0x277690', 'KERNEL32.dll')
('0x2785e0', 'KERNEL32.dll')
('0x2786d3', 'ErroroccursinGetL')
('0x278950', 'KERNEL32.dll')
('0x2789e0', 'GetDriveTypeW')
('0x278a20', 'KERNEL3')
('0x278f10', 'PathCombineW')
('0x278f50', 'SHLWAPI.dll')
('0x278fa4', 'FindFirstFile')
('0x278fe0', 'KERNEL32.dll')
('0x279120', 'PathCombineW')
('0x279160', 'SHLWAPI.dll')
('0x2791c1', 'CreateFileW')
('0x279200', 'KERNEL32.dll')
('0x279280', 'GetFileTime')
('0x2792c0', 'KERNEL32.dll')
('0x279320', 'CloseHandle')
('0x279360', 'KERNEL32.dll')
('0x2796a0', 'FindNextFileW')
('0x2796e0', 'KERNEL32.dll')
('0x2797b3', 'Cannotaccesstofold')
('0x27a460', 'KERNEL32.dll')
('0x27a4e3', 'kernel32.dll')
('0x27a540', 'PathCombineW')
('0x27a580', 'SHLWAPI.dll')
('0x27a5e0', 'CreateFileW')
('0x27a620', 'KERNEL32.dll')
('0x27a692', 'GetFileTime')
('0x27a6d0', 'KERNEL32.dll')
('0x27a730', 'CloseHandle')
('0x27a770', 'KERNEL32.dll')
('0x27acf0', 'CreateFileW')
('0x27ad30', 'KERNEL32.dll')
('0x27ade0', 'GetFileTime')
('0x27ae20', 'KERNEL32.dll')
('0x27af80', 'GetLastError')
('0x27afc0', 'KERNEL32.dll')
('0x27b430', 'GetLastError')
('0x27b470', 'KERNEL32.dll')
('0x27b932', 'CreateFileW')
('0x27b970', 'KERNEL32.dll')
('0x27b9f0', 'GetLastError')
('0x27ba30', 'KERNEL32.dll')
('0x27bf60', 'KERNEL32.dll')
('0x27c000', 'KERNEL32.dll')
('0x27c080', 'KERNEL32.dll')
('0x27c1b0', 'CloseHandle')
('0x27c1f0', 'KERNEL32.dll')
('0x27c270', 'GetLastError')
('0x27c2b0', 'KERNEL32.dll')
('0x27c3c3', 'Nodescriptorfound.')
('0x27c860', 'KERNEL32.dll')
('0x27c950', 'CloseHandle')
('0x27c990', 'KERNEL32.dll')
('0x27c9f0', 'GetLastError')
('0x27ca30', 'KERNEL32.dll')
('0x27cb00', 'CloseHandle')
('0x27cb40', 'KERNEL32.dll')
('0x27cdc0', 'CloseHandle')
('0x27ce00', 'KERNEL32.dll')
('0x27d180', 'KERNEL32.dll')
('0x27d1f0', 'DeleteFileW')
('0x27d230', 'KERNEL32.dll')
('0x27d290', 'GetLastError')
('0x27d2d0', 'KERNEL32.dll')
('0x27d3e3', 'Deletesuccessed.')
('0x2c3743', 'Deletepayloadcorrupt')
('0x27da30', 'PathCombineW')
('0x27da70', 'SHLWAPI.dll')
('0x27dac4', 'FindFirstFile')
('0x27db00', 'KERNEL32.dll')
('0x27dc20', 'PathCombineW')
('0x27dc60', 'SHLWAPI.dll')
('0x27ded1', 'FindNex2@\x04@%@')
('0x27df10', 'KERNEL32.dll')
('0x284030', 'OpenClipboard')
('0x284110', 'Kernel32.dll')
('0x2841b3', '<CTRL+V>')
('0x284253', '</CTRL+V>')
('0x284fe3', 'Composition')
('0x285073', 'Sfwr\\irsf\\i')
('0x28507c', 'otaeMcootW')
('0x285484', 'Monitor%d[%d*%d]')
('0x28b280', 'DeleteObject')
('0x28b400', 'KERNEL32.dll')
('0x28b4a0', 'KERNEL32.dll')
('0x28b6d0', 'Advapi32.dll')
('0x28cdc0', 'KERNEL32.dll')
('0x28d230', 'ExitProcess')
('0x28d270', 'KERNEL32.dll')
('0x28d3b0', 'GetTempPathW')
('0x28d3f0', 'KERNEL32.dll')
('0x28d4a0', 'PathCombineW')
('0x28d4e0', 'SHLWAPI.dll')

--End Decoded Strings--

Screenshots