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Windows Analysis Report
aqB7l6kvXl.exe

Overview

General Information

Sample name:aqB7l6kvXl.exe
renamed because original name is a hash value
Original sample name:5d0fc271f0606b92ab5c9ad53a790cb0N.exe
Analysis ID:1472668
MD5:5d0fc271f0606b92ab5c9ad53a790cb0
SHA1:c127a41f0cbd5fdb93126f99df6b411db705051c
SHA256:5046511eb489387b7a835a990ea3b36b77185f3fad905511c4bce30aa654c60b
Tags:exeRATRemcos
Infos:

Detection

Remcos
Score:100
Range:0 - 100
Whitelisted:false
Confidence:100%

Signatures

Antivirus detection for URL or domain
Contains functionality to bypass UAC (CMSTPLUA)
Found malware configuration
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Yara detected AntiVM3
Yara detected Remcos RAT
Yara detected UAC Bypass using CMSTP
.NET source code contains potential unpacker
AI detected suspicious sample
C2 URLs / IPs found in malware configuration
Contains functionality to register a low level keyboard hook
Contains functionality to steal Chrome passwords or cookies
Contains functionality to steal Firefox passwords or cookies
Contains functionalty to change the wallpaper
Delayed program exit found
Injects a PE file into a foreign processes
Installs a global keyboard hook
Machine Learning detection for dropped file
Machine Learning detection for sample
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Yara detected Costura Assembly Loader
Abnormal high CPU Usage
Allocates memory with a write watch (potentially for evading sandboxes)
Contains functionality for read data from the clipboard
Contains functionality to call native functions
Contains functionality to check if a debugger is running (IsDebuggerPresent)
Contains functionality to download and launch executables
Contains functionality to dynamically determine API calls
Contains functionality to enumerate process and check for explorer.exe or svchost.exe (often used for thread injection)
Contains functionality to enumerate running services
Contains functionality to launch a control a shell (cmd.exe)
Contains functionality to modify clipboard data
Contains functionality to query CPU information (cpuid)
Contains functionality to query locales information (e.g. system language)
Contains functionality to read the PEB
Contains functionality to read the clipboard data
Contains functionality to retrieve information about pressed keystrokes
Contains functionality to shutdown / reboot the system
Contains functionality to simulate mouse events
Contains functionality which may be used to detect a debugger (GetProcessHeap)
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected TCP or UDP traffic on non-standard ports
Detected potential crypto function
Drops PE files
Enables debug privileges
Extensive use of GetProcAddress (often used to hide API calls)
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
HTTP GET or POST without a user agent
IP address seen in connection with other malware
Internet Provider seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
Queries the volume information (name, serial number etc) of a device
Sample file is different than original file name gathered from version info
Sigma detected: CurrentVersion Autorun Keys Modification
Uses 32bit PE files
Uses Microsoft's Enhanced Cryptographic Provider
Uses code obfuscation techniques (call, push, ret)
Yara signature match

Classification

  • System is w10x64
  • aqB7l6kvXl.exe (PID: 6348 cmdline: "C:\Users\user\Desktop\aqB7l6kvXl.exe" MD5: 5D0FC271F0606B92AB5C9AD53A790CB0)
    • aqB7l6kvXl.exe (PID: 6608 cmdline: "C:\Users\user\Desktop\aqB7l6kvXl.exe" MD5: 5D0FC271F0606B92AB5C9AD53A790CB0)
  • Pzpgzqlkyf.exe (PID: 2844 cmdline: "C:\Users\user\AppData\Roaming\Pzpgzqlkyf.exe" MD5: 5D0FC271F0606B92AB5C9AD53A790CB0)
    • Pzpgzqlkyf.exe (PID: 7016 cmdline: "C:\Users\user\AppData\Roaming\Pzpgzqlkyf.exe" MD5: 5D0FC271F0606B92AB5C9AD53A790CB0)
  • Pzpgzqlkyf.exe (PID: 6636 cmdline: "C:\Users\user\AppData\Roaming\Pzpgzqlkyf.exe" MD5: 5D0FC271F0606B92AB5C9AD53A790CB0)
    • Pzpgzqlkyf.exe (PID: 3652 cmdline: "C:\Users\user\AppData\Roaming\Pzpgzqlkyf.exe" MD5: 5D0FC271F0606B92AB5C9AD53A790CB0)
  • cleanup
NameDescriptionAttributionBlogpost URLsLink
Remcos, RemcosRATRemcos (acronym of Remote Control & Surveillance Software) is a commercial Remote Access Tool to remotely control computers.Remcos is advertised as legitimate software which can be used for surveillance and penetration testing purposes, but has been used in numerous hacking campaigns.Remcos, once installed, opens a backdoor on the computer, granting full access to the remote user.Remcos is developed by the cybersecurity company BreakingSecurity.
  • APT33
  • The Gorgon Group
  • UAC-0050
https://malpedia.caad.fkie.fraunhofer.de/details/win.remcos
{"Host:Port:Password": "areaseguras.con-ip.com:2707:1", "Assigned name": "spacolombia2707RAPTOR", "Connect interval": "1", "Install flag": "Disable", "Setup HKCU\\Run": "Enable", "Setup HKLM\\Run": "Enable", "Install path": "Application path", "Copy file": "remcos.exe", "Startup value": "Enable", "Hide file": "Disable", "Mutex": "Rmc121455011-7TOVMS", "Keylog flag": "1", "Keylog path": "AppData", "Keylog file": "logs.dat", "Keylog crypt": "Disable", "Hide keylog file": "Disable", "Screenshot flag": "Disable", "Screenshot time": "10", "Take Screenshot option": "Disable", "Take screenshot title": "", "Take screenshot time": "5", "Screenshot path": "AppData", "Screenshot file": "Screenshots", "Screenshot crypt": "Disable", "Mouse option": "Disable", "Delete file": "Disable", "Audio record time": "5"}
SourceRuleDescriptionAuthorStrings
C:\Users\user\AppData\Roaming\loggsdSSC\logs.datJoeSecurity_RemcosYara detected Remcos RATJoe Security
    SourceRuleDescriptionAuthorStrings
    00000006.00000002.1849024833.00000000010F8000.00000004.00000020.00020000.00000000.sdmpJoeSecurity_RemcosYara detected Remcos RATJoe Security
      00000005.00000002.1859175742.000000000437E000.00000004.00000800.00020000.00000000.sdmpJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
        00000000.00000002.1670854325.0000000005640000.00000004.08000000.00040000.00000000.sdmpJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
          00000005.00000002.1859175742.000000000463B000.00000004.00000800.00020000.00000000.sdmpJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
            00000003.00000002.1766248655.0000000000400000.00000040.00000400.00020000.00000000.sdmpJoeSecurity_RemcosYara detected Remcos RATJoe Security
              Click to see the 42 entries
              SourceRuleDescriptionAuthorStrings
              5.2.Pzpgzqlkyf.exe.437eb50.7.raw.unpackJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
                0.2.aqB7l6kvXl.exe.5640000.10.raw.unpackJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
                  2.2.Pzpgzqlkyf.exe.42eb3e8.15.raw.unpackJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
                    2.2.Pzpgzqlkyf.exe.2d45e40.1.unpackJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security
                      2.2.Pzpgzqlkyf.exe.438b408.5.raw.unpackJoeSecurity_CosturaAssemblyLoaderYara detected Costura Assembly LoaderJoe Security