Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    27-03-2021 19:32

General

  • Target

    SecuriteInfo.com.Mal.GandCrypt-A.5674.24831.exe

  • Size

    162KB

  • MD5

    b4eb6b71786c58d41f2b719e5c102662

  • SHA1

    3653372d26a08503acc0a3ffe66b67ed3bbc93e7

  • SHA256

    6b4d4a61ef4fbabcb304b9c5665cc3e6c2ea866fba7d848094fe93ee6580411f

  • SHA512

    c3a1a060249b51360c6c61a7ccb86e4df66837d759d96ace783b1afdc90189115e2b08c188170a4e31ca27aca656fca4ea38ba900683fbad60e4ba086920c9bc

Malware Config

Extracted

Family

smokeloader

Version

2020

C2

http://xsss99.icu/upload/

http://bingooodsg.icu/upload/

http://junntd.xyz/upload/

http://ginessa11.xyz/upload/

http://overplayninsx.xyz/upload/

http://bananinze.com/upload/

http://daunimlas.com/upload/

rc4.i32
rc4.i32

Signatures

  • SmokeLoader

    Modular backdoor trojan in use since 2014.

  • Taurus Stealer

    Taurus is an infostealer first seen in June 2020.

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Vidar

    Vidar is an infostealer based on Arkei stealer.

  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 7 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Deletes itself 1 IoCs
  • Loads dropped DLL 13 IoCs
  • Modifies file permissions 1 TTPs 1 IoCs
  • Reads local data of messenger clients 2 TTPs

    Infostealers often target stored data of messaging applications, which can include saved credentials and account information.

  • Reads user/profile data of web browsers 2 TTPs

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

  • Accesses 2FA software files, possible credential harvesting 2 TTPs
  • Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Checks installed software on the system 1 TTPs

    Looks up Uninstall key entries in the registry to enumerate software on the system.

  • Looks up external IP address via web service 3 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Launches sc.exe

    Sc.exe is a Windows utlilty to control services on the system.

  • Enumerates physical storage devices 1 TTPs

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

  • Checks SCSI registry key(s) 3 TTPs 3 IoCs

    SCSI information is often read in order to detect sandboxing environments.

  • Checks processor information in registry 2 TTPs 2 IoCs

    Processor information is often read in order to detect sandboxing environments.

  • Delays execution with timeout.exe 2 IoCs
  • Kills process with taskkill 1 IoCs
  • Modifies system certificate store 2 TTPs 7 IoCs
  • Suspicious behavior: EnumeratesProcesses 64 IoCs
  • Suspicious behavior: MapViewOfSection 1 IoCs
  • Suspicious use of FindShellTrayWindow 4 IoCs
  • Suspicious use of SendNotifyMessage 4 IoCs
  • Suspicious use of WriteProcessMemory 55 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Mal.GandCrypt-A.5674.24831.exe
    "C:\Users\Admin\AppData\Local\Temp\SecuriteInfo.com.Mal.GandCrypt-A.5674.24831.exe"
    1⤵
    • Loads dropped DLL
    • Checks SCSI registry key(s)
    • Suspicious behavior: EnumeratesProcesses
    • Suspicious behavior: MapViewOfSection
    PID:644
  • C:\Users\Admin\AppData\Local\Temp\21E2.exe
    C:\Users\Admin\AppData\Local\Temp\21E2.exe
    1⤵
    • Executes dropped EXE
    • Loads dropped DLL
    • Adds Run key to start application
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:780
    • C:\Windows\SysWOW64\icacls.exe
      icacls "C:\Users\Admin\AppData\Local\6c18ef88-938e-4db1-b0e1-1dd61ff434f0" /deny *S-1-1-0:(OI)(CI)(DE,DC)
      2⤵
      • Modifies file permissions
      PID:1316
    • C:\Users\Admin\AppData\Local\Temp\21E2.exe
      "C:\Users\Admin\AppData\Local\Temp\21E2.exe" --Admin IsNotAutoStart IsNotTask
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Modifies system certificate store
      • Suspicious use of WriteProcessMemory
      PID:2004
      • C:\Users\Admin\AppData\Local\9453e8d3-64e2-4ba7-a4f7-e17d37d79468\updatewin.exe
        "C:\Users\Admin\AppData\Local\9453e8d3-64e2-4ba7-a4f7-e17d37d79468\updatewin.exe"
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        PID:1508
        • C:\Windows\SysWOW64\cmd.exe
          /c timeout /t 3 & del /f /q C:\Users\Admin\AppData\Local\9453e8d3-64e2-4ba7-a4f7-e17d37d79468\updatewin.exe
          4⤵
            PID:1708
            • C:\Windows\SysWOW64\timeout.exe
              timeout /t 3
              5⤵
              • Delays execution with timeout.exe
              PID:1936
        • C:\Users\Admin\AppData\Local\9453e8d3-64e2-4ba7-a4f7-e17d37d79468\5.exe
          "C:\Users\Admin\AppData\Local\9453e8d3-64e2-4ba7-a4f7-e17d37d79468\5.exe"
          3⤵
          • Executes dropped EXE
          PID:1328
    • C:\Users\Admin\AppData\Local\Temp\2C5F.exe
      C:\Users\Admin\AppData\Local\Temp\2C5F.exe
      1⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Checks processor information in registry
      • Modifies system certificate store
      PID:1148
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /c taskkill /im 2C5F.exe /f & timeout /t 6 & del /f /q "C:\Users\Admin\AppData\Local\Temp\2C5F.exe" & del C:\ProgramData\*.dll & exit
        2⤵
          PID:1940
          • C:\Windows\SysWOW64\taskkill.exe
            taskkill /im 2C5F.exe /f
            3⤵
            • Kills process with taskkill
            PID:1992
          • C:\Windows\SysWOW64\timeout.exe
            timeout /t 6
            3⤵
            • Delays execution with timeout.exe
            PID:1532
      • C:\Users\Admin\AppData\Local\Temp\3B2E.exe
        C:\Users\Admin\AppData\Local\Temp\3B2E.exe
        1⤵
        • Executes dropped EXE
        • Suspicious use of WriteProcessMemory
        PID:372
        • C:\Windows\SysWOW64\cmd.exe
          "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xxxndtto\
          2⤵
            PID:2012
          • C:\Windows\SysWOW64\cmd.exe
            "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\zbufmuiy.exe" C:\Windows\SysWOW64\xxxndtto\
            2⤵
              PID:1952
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" create xxxndtto binPath= "C:\Windows\SysWOW64\xxxndtto\zbufmuiy.exe /d\"C:\Users\Admin\AppData\Local\Temp\3B2E.exe\"" type= own start= auto DisplayName= "wifi support"
              2⤵
                PID:1732
              • C:\Windows\SysWOW64\sc.exe
                "C:\Windows\System32\sc.exe" description xxxndtto "wifi internet conection"
                2⤵
                  PID:740
                • C:\Windows\SysWOW64\sc.exe
                  "C:\Windows\System32\sc.exe" start xxxndtto
                  2⤵
                    PID:1316
                  • C:\Windows\SysWOW64\netsh.exe
                    "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
                    2⤵
                      PID:968
                  • C:\Windows\SysWOW64\xxxndtto\zbufmuiy.exe
                    C:\Windows\SysWOW64\xxxndtto\zbufmuiy.exe /d"C:\Users\Admin\AppData\Local\Temp\3B2E.exe"
                    1⤵
                    • Executes dropped EXE
                    PID:576
                    • C:\Windows\SysWOW64\svchost.exe
                      svchost.exe
                      2⤵
                        PID:1732

                    Network

                    MITRE ATT&CK Enterprise v6

                    Replay Monitor

                    Loading Replay Monitor...

                    Downloads

                    • memory/372-42-0x00000000001B0000-0x00000000001C3000-memory.dmp

                      Filesize

                      76KB

                    • memory/372-43-0x0000000000400000-0x0000000000415000-memory.dmp

                      Filesize

                      84KB

                    • memory/372-34-0x0000000002090000-0x00000000020A1000-memory.dmp

                      Filesize

                      68KB

                    • memory/576-81-0x0000000000400000-0x0000000000415000-memory.dmp

                      Filesize

                      84KB

                    • memory/576-73-0x0000000000E90000-0x0000000000EA1000-memory.dmp

                      Filesize

                      68KB

                    • memory/644-2-0x0000000002070000-0x0000000002081000-memory.dmp

                      Filesize

                      68KB

                    • memory/644-3-0x00000000765E1000-0x00000000765E3000-memory.dmp

                      Filesize

                      8KB

                    • memory/644-5-0x00000000001B0000-0x00000000001B9000-memory.dmp

                      Filesize

                      36KB

                    • memory/644-6-0x0000000000400000-0x0000000000409000-memory.dmp

                      Filesize

                      36KB

                    • memory/780-10-0x0000000001BA0000-0x0000000001BB1000-memory.dmp

                      Filesize

                      68KB

                    • memory/780-12-0x0000000001800000-0x000000000191A000-memory.dmp

                      Filesize

                      1.1MB

                    • memory/780-13-0x0000000000400000-0x0000000000537000-memory.dmp

                      Filesize

                      1.2MB

                    • memory/1148-17-0x00000000021C0000-0x00000000021D1000-memory.dmp

                      Filesize

                      68KB

                    • memory/1148-19-0x0000000000AE0000-0x0000000000B75000-memory.dmp

                      Filesize

                      596KB

                    • memory/1148-20-0x0000000000400000-0x0000000000498000-memory.dmp

                      Filesize

                      608KB

                    • memory/1264-7-0x0000000002C60000-0x0000000002C76000-memory.dmp

                      Filesize

                      88KB

                    • memory/1328-84-0x0000000000400000-0x0000000000499000-memory.dmp

                      Filesize

                      612KB

                    • memory/1328-83-0x0000000002BF0000-0x0000000002C86000-memory.dmp

                      Filesize

                      600KB

                    • memory/1328-75-0x0000000002DE0000-0x0000000002DF1000-memory.dmp

                      Filesize

                      68KB

                    • memory/1608-16-0x000007FEF6350000-0x000007FEF65CA000-memory.dmp

                      Filesize

                      2.5MB

                    • memory/1732-77-0x00000000000C0000-0x00000000000D5000-memory.dmp

                      Filesize

                      84KB

                    • memory/2004-54-0x0000000000400000-0x0000000000537000-memory.dmp

                      Filesize

                      1.2MB

                    • memory/2004-41-0x0000000001D60000-0x0000000001D71000-memory.dmp

                      Filesize

                      68KB