Analysis

  • max time kernel
    150s
  • max time network
    119s
  • platform
    windows7_x64
  • resource
    win7
  • submitted
    19-07-2020 19:48

General

  • Target

    citadel_3.1.0.0.vir.exe

  • Size

    307KB

  • MD5

    3d3ef329a4d920735fbc6c56d2a15691

  • SHA1

    74c7c9c8470ea55c04ee3c7fe168793ee32d4686

  • SHA256

    1ec347934db2ded3a012479882732bfb3cdc85b0d4b2911e3402c1fa693a2235

  • SHA512

    0e2d88ef2f8f8d1a65f63473e89c345cb73630efa5c717e7a8f721ae8703077d651ee66ee4756c4a4d6e6e1a007c6246b007c20689be195763353bcb7654c9ed

Malware Config

Signatures

  • Suspicious use of WriteProcessMemory 58 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Deletes itself 1 IoCs
  • Reads user/profile data of web browsers 2 TTPs

    Infostealers often target stored browser data, which can include saved credentials etc.

  • Loads dropped DLL 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • NTFS ADS 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 5 IoCs
  • Suspicious behavior: EnumeratesProcesses 61 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Modifies Internet Explorer settings 1 TTPs 2 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Identifies Wine through registry keys 2 TTPs 2 IoCs

    Wine is a compatibility layer capable of running Windows applications, which can be used as sandboxing environment.

  • Adds Run key to start application 2 TTPs 2 IoCs

Processes

  • C:\Windows\system32\taskhost.exe
    "taskhost.exe"
    1⤵
      PID:1152
    • C:\Windows\system32\Dwm.exe
      "C:\Windows\system32\Dwm.exe"
      1⤵
        PID:1232
      • C:\Windows\Explorer.EXE
        C:\Windows\Explorer.EXE
        1⤵
          PID:1296
          • C:\Users\Admin\AppData\Local\Temp\citadel_3.1.0.0.vir.exe
            "C:\Users\Admin\AppData\Local\Temp\citadel_3.1.0.0.vir.exe"
            2⤵
            • Suspicious use of WriteProcessMemory
            • Loads dropped DLL
            • Suspicious use of AdjustPrivilegeToken
            • Suspicious use of SetThreadContext
            • Modifies Internet Explorer settings
            PID:316
            • C:\Users\Admin\AppData\Roaming\Siubdy\ycwei.exe
              "C:\Users\Admin\AppData\Roaming\Siubdy\ycwei.exe"
              3⤵
              • Suspicious use of WriteProcessMemory
              • Executes dropped EXE
              • Suspicious behavior: EnumeratesProcesses
              • Identifies Wine through registry keys
              • Adds Run key to start application
              PID:1440
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\system32\cmd.exe" /c "C:\Users\Admin\AppData\Local\Temp\tmpdbea69d1.bat"
              3⤵
              • Deletes itself
              PID:2024
        • C:\Program Files\Windows Mail\WinMail.exe
          "C:\Program Files\Windows Mail\WinMail.exe" -Embedding
          1⤵
          • Suspicious use of SendNotifyMessage
          • Suspicious use of FindShellTrayWindow
          • NTFS ADS
          • Suspicious use of AdjustPrivilegeToken
          • Suspicious use of SetWindowsHookEx
          PID:304
        • C:\Windows\system32\DllHost.exe
          C:\Windows\system32\DllHost.exe /Processid:{3EB3C877-1F16-487C-9050-104DBCD66683}
          1⤵
            PID:1128
          • C:\Windows\system32\DllHost.exe
            C:\Windows\system32\DllHost.exe /Processid:{F9717507-6651-4EDB-BFF7-AE615179BCCF}
            1⤵
              PID:1532
            • C:\Windows\system32\DllHost.exe
              C:\Windows\system32\DllHost.exe /Processid:{F9717507-6651-4EDB-BFF7-AE615179BCCF}
              1⤵
                PID:1720
              • C:\Windows\system32\DllHost.exe
                C:\Windows\system32\DllHost.exe /Processid:{F9717507-6651-4EDB-BFF7-AE615179BCCF}
                1⤵
                  PID:1712
                • C:\Windows\system32\DllHost.exe
                  C:\Windows\system32\DllHost.exe /Processid:{F9717507-6651-4EDB-BFF7-AE615179BCCF}
                  1⤵
                    PID:1908

                  Network

                  MITRE ATT&CK Matrix ATT&CK v6

                  Persistence

                  Registry Run Keys / Startup Folder

                  1
                  T1060

                  Defense Evasion

                  Modify Registry

                  2
                  T1112

                  Virtualization/Sandbox Evasion

                  1
                  T1497

                  Credential Access

                  Credentials in Files

                  1
                  T1081

                  Discovery

                  Query Registry

                  1
                  T1012

                  Virtualization/Sandbox Evasion

                  1
                  T1497

                  Collection

                  Data from Local System

                  1
                  T1005

                  Replay Monitor

                  Loading Replay Monitor...

                  Downloads

                  • C:\Users\Admin\AppData\Local\Temp\tmpdbea69d1.bat
                  • C:\Users\Admin\AppData\Roaming\Gukyeg\kyebl.sye
                  • C:\Users\Admin\AppData\Roaming\Siubdy\ycwei.exe
                  • C:\Users\Admin\AppData\Roaming\Siubdy\ycwei.exe
                  • \Users\Admin\AppData\Roaming\Siubdy\ycwei.exe
                  • memory/304-4-0x0000000003880000-0x0000000003980000-memory.dmp
                    Filesize

                    1024KB

                  • memory/304-6-0x0000000003880000-0x0000000003A80000-memory.dmp
                    Filesize

                    2.0MB

                  • memory/304-8-0x0000000003880000-0x0000000003980000-memory.dmp
                    Filesize

                    1024KB

                  • memory/304-9-0x0000000003880000-0x0000000003A80000-memory.dmp
                    Filesize

                    2.0MB

                  • memory/304-10-0x0000000003980000-0x0000000003A80000-memory.dmp
                    Filesize

                    1024KB

                  • memory/304-14-0x0000000003AD0000-0x0000000003AD2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-15-0x0000000003AF0000-0x0000000003AF2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-16-0x0000000003AE0000-0x0000000003AE2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-17-0x0000000003BC0000-0x0000000003BC2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-18-0x0000000004080000-0x0000000004082000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-19-0x0000000003AD0000-0x0000000003AD2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-20-0x0000000003EE0000-0x0000000003EE2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-21-0x0000000003CD0000-0x0000000003CD2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-22-0x0000000003D00000-0x0000000003D02000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-23-0x0000000003EC0000-0x0000000003EC2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-24-0x0000000003CF0000-0x0000000003CF2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-25-0x0000000004090000-0x0000000004092000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-26-0x0000000003CA0000-0x0000000003CA2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-27-0x0000000003D10000-0x0000000003D12000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-28-0x0000000004180000-0x0000000004182000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-29-0x00000000044D0000-0x00000000044D2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-30-0x00000000044E0000-0x00000000044E2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-31-0x00000000044F0000-0x00000000044F2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-32-0x0000000004A50000-0x0000000004A52000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-33-0x0000000004AF0000-0x0000000004AF2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-34-0x0000000004B50000-0x0000000004B52000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-35-0x0000000004B80000-0x0000000004B82000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-36-0x0000000004B40000-0x0000000004B42000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-37-0x0000000004B90000-0x0000000004B92000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-38-0x0000000004B30000-0x0000000004B32000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-39-0x0000000004BA0000-0x0000000004BA2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-40-0x0000000004B20000-0x0000000004B22000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-41-0x0000000004C30000-0x0000000004C32000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-42-0x0000000004B10000-0x0000000004B12000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-43-0x0000000003EB0000-0x0000000003EB2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-44-0x0000000003BE0000-0x0000000003BE2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-45-0x0000000005860000-0x0000000005862000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-46-0x00000000057D0000-0x00000000057D2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-47-0x0000000005740000-0x0000000005742000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-48-0x00000000056E0000-0x00000000056E2000-memory.dmp
                    Filesize

                    8KB

                  • memory/304-49-0x0000000003880000-0x0000000003980000-memory.dmp
                    Filesize

                    1024KB

                  • memory/304-51-0x0000000002490000-0x00000000024A0000-memory.dmp
                    Filesize

                    64KB

                  • memory/304-57-0x0000000000470000-0x0000000000480000-memory.dmp
                    Filesize

                    64KB

                  • memory/1440-1-0x0000000000000000-mapping.dmp
                  • memory/2024-63-0x00000000000D0000-0x0000000000115000-memory.dmp
                    Filesize

                    276KB

                  • memory/2024-65-0x00000000000F1D29-mapping.dmp