Analysis

  • max time kernel
    102s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    18-11-2020 16:58

General

  • Target

    Archive.zip__ccacaxs2tbz2t6ob3e.exe

Malware Config

Signatures

  • Creates new service(s) 1 TTPs
  • Downloads MZ/PE file
  • Executes dropped EXE 7 IoCs
  • Loads dropped DLL 64 IoCs
  • Reads user/profile data of web browsers 2 TTPs

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

  • 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.

  • Legitimate hosting services abused for malware hosting/C2 1 TTPs
  • Looks up external IP address via web service 1 IoCs

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

  • Drops file in System32 directory 4 IoCs
  • Drops file in Program Files directory 64 IoCs
  • Drops file in Windows directory 4 IoCs
  • 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.

  • Modifies Internet Explorer settings 1 TTPs 13 IoCs
  • Modifies Internet Explorer start page 1 TTPs 1 IoCs
  • Modifies data under HKEY_USERS 64 IoCs
  • Modifies system certificate store 2 TTPs 10 IoCs
  • Suspicious behavior: EnumeratesProcesses 10 IoCs
  • Suspicious use of AdjustPrivilegeToken 14 IoCs
  • Suspicious use of FindShellTrayWindow 1 IoCs
  • Suspicious use of SendNotifyMessage 1 IoCs
  • Suspicious use of WriteProcessMemory 64 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\Archive.zip__ccacaxs2tbz2t6ob3e.exe
    "C:\Users\Admin\AppData\Local\Temp\Archive.zip__ccacaxs2tbz2t6ob3e.exe"
    1⤵
    • Loads dropped DLL
    • Modifies system certificate store
    • Suspicious use of WriteProcessMemory
    PID:784
    • C:\Users\Admin\AppData\Local\Temp\Temp\WCInstaller.exe
      C:\Users\Admin\AppData\Local\Temp\Temp\WCInstaller.exe --silent --partner=AE190201 --homepage=1 --search=1 --campaign=292
      2⤵
      • Executes dropped EXE
      • Loads dropped DLL
      • Suspicious use of WriteProcessMemory
      PID:728
      • C:\Users\Admin\AppData\Local\Temp\7zS8D2DC564\WebCompanionInstaller.exe
        .\WebCompanionInstaller.exe --partner=AE190201 --campaign=292 --version=7.0.2354.4185 --prod --silent --partner=AE190201 --homepage=1 --search=1 --campaign=292
        3⤵
        • Executes dropped EXE
        • Loads dropped DLL
        • Drops file in Program Files directory
        • Drops file in Windows directory
        • Modifies system certificate store
        • Suspicious use of WriteProcessMemory
        PID:1632
        • C:\Windows\SysWOW64\sc.exe
          "sc.exe" Create "WCAssistantService" binPath= "C:\Program Files (x86)\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe" DisplayName= "WC Assistant" start= auto
          4⤵
            PID:1944
          • C:\Windows\SysWOW64\sc.exe
            "sc.exe" failure WCAssistantService reset= 30 actions= restart/60000
            4⤵
              PID:1340
            • C:\Windows\SysWOW64\sc.exe
              "sc.exe" description "WCAssistantService" "Ad-Aware Web Companion Internet security service"
              4⤵
                PID:516
              • C:\Windows\SysWOW64\cmd.exe
                "C:\Windows\System32\cmd.exe" /C netsh http add urlacl url=http://+:9007/ user=Everyone
                4⤵
                • Suspicious use of WriteProcessMemory
                PID:936
                • C:\Windows\SysWOW64\netsh.exe
                  netsh http add urlacl url=http://+:9007/ user=Everyone
                  5⤵
                    PID:1688
                • C:\Program Files (x86)\Lavasoft\Web Companion\Application\WebCompanion.exe
                  "C:\Program Files (x86)\Lavasoft\Web Companion\Application\WebCompanion.exe" --silent --install --geo=
                  4⤵
                  • Executes dropped EXE
                  • Loads dropped DLL
                  • Adds Run key to start application
                  • Drops file in Windows directory
                  • Modifies Internet Explorer settings
                  • Modifies Internet Explorer start page
                  • Suspicious behavior: EnumeratesProcesses
                  • Suspicious use of AdjustPrivilegeToken
                  • Suspicious use of WriteProcessMemory
                  PID:908
                  • C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe
                    "C:\Windows\Microsoft.NET\Framework\v2.0.50727\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\kavlf367.cmdline"
                    5⤵
                    • Suspicious use of WriteProcessMemory
                    PID:912
                    • C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe
                      C:\Windows\Microsoft.NET\Framework\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESF2D8.tmp" "c:\Users\Admin\AppData\Local\Temp\CSCF2D7.tmp"
                      6⤵
                        PID:2072
                    • C:\Program Files (x86)\Lavasoft\Web Companion\Application\Ad-Aware Web Companion.exe
                      "C:\Program Files (x86)\Lavasoft\Web Companion\Application\Ad-Aware Web Companion.exe" {0633EE93-D776-472f-A0FF-E1416B8B2E3A}
                      5⤵
                      • Executes dropped EXE
                      PID:2252
                  • C:\Program Files (x86)\Lavasoft\Web Companion\Application\WebCompanion.exe
                    "C:\Program Files (x86)\Lavasoft\Web Companion\Application\WebCompanion.exe" --silent --afterinstall
                    4⤵
                    • Executes dropped EXE
                    • Loads dropped DLL
                    • Suspicious use of FindShellTrayWindow
                    • Suspicious use of SendNotifyMessage
                    PID:2384
              • C:\Users\Admin\AppData\Local\Temp\99E4.tmp.exe
                C:\Users\Admin\AppData\Local\Temp\99E4.tmp.exe
                2⤵
                • Executes dropped EXE
                PID:788
            • C:\Program Files (x86)\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe
              "C:\Program Files (x86)\Lavasoft\Web Companion\Application\Lavasoft.WCAssistant.WinService.exe"
              1⤵
              • Executes dropped EXE
              • Drops file in System32 directory
              • Modifies data under HKEY_USERS
              • Suspicious behavior: EnumeratesProcesses
              • Suspicious use of AdjustPrivilegeToken
              • Suspicious use of WriteProcessMemory
              PID:1320
              • C:\Windows\System32\cmd.exe
                "C:\Windows\System32\cmd.exe" /C netsh http add urlacl url=http://+:9007/ user=Everyone
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:1160
                • C:\Windows\system32\netsh.exe
                  netsh http add urlacl url=http://+:9007/ user=Everyone
                  3⤵
                  • Modifies data under HKEY_USERS
                  PID:1996
              • C:\Windows\Microsoft.NET\Framework64\v3.5\csc.exe
                "C:\Windows\Microsoft.NET\Framework64\v3.5\csc.exe" /noconfig /fullpaths @"C:\Windows\TEMP\xji-xd7p.cmdline"
                2⤵
                • Suspicious use of WriteProcessMemory
                PID:2184
                • C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe
                  C:\Windows\Microsoft.NET\Framework64\v2.0.50727\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Windows\TEMP\RESFFF2.tmp" "c:\Windows\Temp\CSCFFF1.tmp"
                  3⤵
                    PID:2220

              Network

              MITRE ATT&CK Enterprise v6

              Replay Monitor

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              Downloads

              • memory/908-101-0x0000000006540000-0x0000000006541000-memory.dmp

                Filesize

                4KB

              • memory/908-98-0x000000006B770000-0x000000006BE5E000-memory.dmp

                Filesize

                6.9MB

              • memory/1320-107-0x000007FEF4FB0000-0x000007FEF594D000-memory.dmp

                Filesize

                9.6MB

              • memory/1320-106-0x000007FEF4FB0000-0x000007FEF594D000-memory.dmp

                Filesize

                9.6MB

              • memory/1972-0-0x000007FEF72E0000-0x000007FEF755A000-memory.dmp

                Filesize

                2.5MB

              • memory/2384-201-0x0000000006500000-0x0000000006501000-memory.dmp

                Filesize

                4KB

              • memory/2384-198-0x000000006D3B0000-0x000000006DA9E000-memory.dmp

                Filesize

                6.9MB