Analysis

  • max time kernel
    151s
  • max time network
    155s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    20-06-2022 16:30

General

  • Target

    free amongus no virus.exe

  • Size

    659KB

  • MD5

    21cb738e372351de0abf0f5bc532ab2c

  • SHA1

    af006c081c76f91866f377059db52576478aab82

  • SHA256

    9f95c22d51882e238da73706c58c9903b4f8543b8dbc549c8b01f9d3b4210165

  • SHA512

    308150556c89f262b74130c0548c134bc1e0ad4e29dd04500e297f53b15988fb3f79cda8a0dafeb225a8ceac1bec5ccfd57a88d02d16dbb82e29d5d703e4cde8

Malware Config

Extracted

Family

darkcomet

Botnet

Sazan

C2

sussysdfffdfff343.duckdns.org:1604

Mutex

DC_MUTEX-TUY24DX

Attributes
  • InstallPath

    MSDCSC\msdcsc.exe

  • gencode

    TPTxFZiBzSR9

  • install

    true

  • offline_keylogger

    true

  • persistence

    true

  • reg_key

    MicroUpdate

Signatures

  • Darkcomet

    DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.

  • Modifies WinLogon for persistence 2 TTPs 1 IoCs
  • Modifies security service 2 TTPs 2 IoCs
  • Windows security bypass 2 TTPs 4 IoCs
  • suricata: ET MALWARE Backdoor.Win32.DarkComet Screenshot Upload Successful

    suricata: ET MALWARE Backdoor.Win32.DarkComet Screenshot Upload Successful

  • Executes dropped EXE 1 IoCs
  • Sets file to hidden 1 TTPs 2 IoCs

    Modifies file attributes to stop it showing in Explorer etc.

  • Deletes itself 1 IoCs
  • Loads dropped DLL 2 IoCs
  • Windows security modification 2 TTPs 2 IoCs
  • Adds Run key to start application 2 TTPs 3 IoCs
  • Suspicious use of SetThreadContext 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Suspicious behavior: GetForegroundWindowSpam 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 64 IoCs
  • Suspicious use of SetWindowsHookEx 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs
  • System policy modification 1 TTPs 3 IoCs
  • Views/modifies file attributes 1 TTPs 2 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\free amongus no virus.exe
    "C:\Users\Admin\AppData\Local\Temp\free amongus no virus.exe"
    1⤵
    • Modifies WinLogon for persistence
    • Loads dropped DLL
    • Adds Run key to start application
    • Suspicious use of AdjustPrivilegeToken
    • Suspicious use of WriteProcessMemory
    PID:548
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp\free amongus no virus.exe" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:2040
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp\free amongus no virus.exe" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2012
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /k attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
      2⤵
      • Suspicious use of WriteProcessMemory
      PID:1740
      • C:\Windows\SysWOW64\attrib.exe
        attrib "C:\Users\Admin\AppData\Local\Temp" +s +h
        3⤵
        • Sets file to hidden
        • Views/modifies file attributes
        PID:2016
    • C:\Windows\SysWOW64\notepad.exe
      notepad
      2⤵
      • Deletes itself
      PID:2000
    • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
      2⤵
      • Modifies security service
      • Windows security bypass
      • Executes dropped EXE
      • Windows security modification
      • Adds Run key to start application
      • Suspicious use of SetThreadContext
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of WriteProcessMemory
      • System policy modification
      PID:1920
      • C:\Program Files (x86)\Internet Explorer\iexplore.exe
        "C:\Program Files (x86)\Internet Explorer\iexplore.exe"
        3⤵
        • Modifies security service
        • Windows security bypass
        • Adds Run key to start application
        • Suspicious behavior: GetForegroundWindowSpam
        • Suspicious use of AdjustPrivilegeToken
        • Suspicious use of SetWindowsHookEx
        • Suspicious use of WriteProcessMemory
        PID:1888
        • C:\Windows\SysWOW64\notepad.exe
          notepad
          4⤵
            PID:1188
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe"
            4⤵
              PID:1996
            • C:\Windows\SysWOW64\cmd.exe
              "C:\Windows\System32\cmd.exe"
              4⤵
                PID:1524
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe"
                4⤵
                  PID:1672
                • C:\Windows\SysWOW64\cmd.exe
                  "C:\Windows\System32\cmd.exe"
                  4⤵
                    PID:1452
                  • C:\Windows\SysWOW64\cmd.exe
                    "C:\Windows\System32\cmd.exe"
                    4⤵
                      PID:436
                    • C:\Windows\SysWOW64\cmd.exe
                      "C:\Windows\System32\cmd.exe"
                      4⤵
                        PID:1992
                      • C:\Windows\SysWOW64\cmd.exe
                        "C:\Windows\System32\cmd.exe"
                        4⤵
                          PID:1288
                        • C:\Windows\SysWOW64\cmd.exe
                          "C:\Windows\System32\cmd.exe"
                          4⤵
                            PID:308
                          • C:\Windows\SysWOW64\cmd.exe
                            "C:\Windows\System32\cmd.exe"
                            4⤵
                              PID:1632
                            • C:\Windows\SysWOW64\cmd.exe
                              "C:\Windows\System32\cmd.exe"
                              4⤵
                                PID:1532
                              • C:\Windows\SysWOW64\cmd.exe
                                "C:\Windows\System32\cmd.exe"
                                4⤵
                                  PID:1540

                          Network

                          MITRE ATT&CK Matrix ATT&CK v6

                          Persistence

                          Winlogon Helper DLL

                          1
                          T1004

                          Modify Existing Service

                          1
                          T1031

                          Hidden Files and Directories

                          2
                          T1158

                          Registry Run Keys / Startup Folder

                          1
                          T1060

                          Defense Evasion

                          Modify Registry

                          6
                          T1112

                          Disabling Security Tools

                          2
                          T1089

                          Hidden Files and Directories

                          2
                          T1158

                          Discovery

                          System Information Discovery

                          1
                          T1082

                          Replay Monitor

                          Loading Replay Monitor...

                          Downloads

                          • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
                            Filesize

                            659KB

                            MD5

                            21cb738e372351de0abf0f5bc532ab2c

                            SHA1

                            af006c081c76f91866f377059db52576478aab82

                            SHA256

                            9f95c22d51882e238da73706c58c9903b4f8543b8dbc549c8b01f9d3b4210165

                            SHA512

                            308150556c89f262b74130c0548c134bc1e0ad4e29dd04500e297f53b15988fb3f79cda8a0dafeb225a8ceac1bec5ccfd57a88d02d16dbb82e29d5d703e4cde8

                          • C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
                            Filesize

                            659KB

                            MD5

                            21cb738e372351de0abf0f5bc532ab2c

                            SHA1

                            af006c081c76f91866f377059db52576478aab82

                            SHA256

                            9f95c22d51882e238da73706c58c9903b4f8543b8dbc549c8b01f9d3b4210165

                            SHA512

                            308150556c89f262b74130c0548c134bc1e0ad4e29dd04500e297f53b15988fb3f79cda8a0dafeb225a8ceac1bec5ccfd57a88d02d16dbb82e29d5d703e4cde8

                          • \Users\Admin\Documents\MSDCSC\msdcsc.exe
                            Filesize

                            659KB

                            MD5

                            21cb738e372351de0abf0f5bc532ab2c

                            SHA1

                            af006c081c76f91866f377059db52576478aab82

                            SHA256

                            9f95c22d51882e238da73706c58c9903b4f8543b8dbc549c8b01f9d3b4210165

                            SHA512

                            308150556c89f262b74130c0548c134bc1e0ad4e29dd04500e297f53b15988fb3f79cda8a0dafeb225a8ceac1bec5ccfd57a88d02d16dbb82e29d5d703e4cde8

                          • \Users\Admin\Documents\MSDCSC\msdcsc.exe
                            Filesize

                            659KB

                            MD5

                            21cb738e372351de0abf0f5bc532ab2c

                            SHA1

                            af006c081c76f91866f377059db52576478aab82

                            SHA256

                            9f95c22d51882e238da73706c58c9903b4f8543b8dbc549c8b01f9d3b4210165

                            SHA512

                            308150556c89f262b74130c0548c134bc1e0ad4e29dd04500e297f53b15988fb3f79cda8a0dafeb225a8ceac1bec5ccfd57a88d02d16dbb82e29d5d703e4cde8

                          • memory/308-76-0x0000000000000000-mapping.dmp
                          • memory/436-73-0x0000000000000000-mapping.dmp
                          • memory/548-54-0x0000000075D21000-0x0000000075D23000-memory.dmp
                            Filesize

                            8KB

                          • memory/1188-67-0x0000000000000000-mapping.dmp
                          • memory/1288-75-0x0000000000000000-mapping.dmp
                          • memory/1452-72-0x0000000000000000-mapping.dmp
                          • memory/1524-70-0x0000000000000000-mapping.dmp
                          • memory/1532-78-0x0000000000000000-mapping.dmp
                          • memory/1540-79-0x0000000000000000-mapping.dmp
                          • memory/1632-77-0x0000000000000000-mapping.dmp
                          • memory/1672-71-0x0000000000000000-mapping.dmp
                          • memory/1740-56-0x0000000000000000-mapping.dmp
                          • memory/1920-63-0x0000000000000000-mapping.dmp
                          • memory/1992-74-0x0000000000000000-mapping.dmp
                          • memory/1996-69-0x0000000000000000-mapping.dmp
                          • memory/2000-58-0x0000000000000000-mapping.dmp
                          • memory/2012-59-0x0000000000000000-mapping.dmp
                          • memory/2016-57-0x0000000000000000-mapping.dmp
                          • memory/2040-55-0x0000000000000000-mapping.dmp