Analysis

  • max time kernel
    293s
  • max time network
    300s
  • platform
    windows7_x64
  • resource
    win7-20231020-en
  • resource tags

    arch:x64arch:x86image:win7-20231020-enlocale:en-usos:windows7-x64system
  • submitted
    06/11/2023, 05:07

General

  • Target

    f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe.exe

  • Size

    221KB

  • MD5

    2488d90434caafc7d576e6e16220a772

  • SHA1

    9f72377d8cc4e561ae6172460df94b8d0f87ed9e

  • SHA256

    f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe

  • SHA512

    5ee948f1eeb8ba21cda44d781b616f96957b6f7a1951b0a4dfe6c7c881ae28d243722cf751209efa8e1e274fe392b0956ea1423ec6ed1efb7880b87e44aa5e18

  • SSDEEP

    3072:WHMfCYL/+qeVAeW5XNFJarDAJ98I2a9CZo2Y07LPd0RPGnllVP:WsfbLQIF00JWla92o2Y0foGnR

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 8 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).

  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 11 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe.exe
    "C:\Users\Admin\AppData\Local\Temp\f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2488
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ckkhijbz\
      2⤵
        PID:2528
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gsaxdqwu.exe" C:\Windows\SysWOW64\ckkhijbz\
        2⤵
          PID:2740
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ckkhijbz binPath= "C:\Windows\SysWOW64\ckkhijbz\gsaxdqwu.exe /d\"C:\Users\Admin\AppData\Local\Temp\f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2660
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ckkhijbz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2780
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ckkhijbz
          2⤵
          • Launches sc.exe
          PID:1528
        • 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:2792
      • C:\Windows\SysWOW64\ckkhijbz\gsaxdqwu.exe
        C:\Windows\SysWOW64\ckkhijbz\gsaxdqwu.exe /d"C:\Users\Admin\AppData\Local\Temp\f784390bef1610437897b0044be3a495e58de9cef5de77d9f45f5b3a5defe5fe.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2824
        • 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:2720
          • 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:568

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              10.6MB

              MD5

              e45db707738db9bb0915a12fa250ced4

              SHA1

              f5b30ca2bfd196563bc3ccfbdeae8170fb71cc47

              SHA256

              fea16c3881a00e93dbd94e2e887baf74754fa743d5c8575a2996f59f617dfd2e

              SHA512

              d8ba4c6bc93138abaf59ab9ff6f7e8217e316c68bd63c8a97faff4bb36cfd35280f97f775eb4c396b3048fa0dd821044de78e1540d02f808ce1bb517a639597b

            • C:\Windows\SysWOW64\ckkhijbz\gsaxdqwu.exe

              Filesize

              10.6MB

              MD5

              e45db707738db9bb0915a12fa250ced4

              SHA1

              f5b30ca2bfd196563bc3ccfbdeae8170fb71cc47

              SHA256

              fea16c3881a00e93dbd94e2e887baf74754fa743d5c8575a2996f59f617dfd2e

              SHA512

              d8ba4c6bc93138abaf59ab9ff6f7e8217e316c68bd63c8a97faff4bb36cfd35280f97f775eb4c396b3048fa0dd821044de78e1540d02f808ce1bb517a639597b

            • memory/568-73-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-72-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-63-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-64-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-68-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/568-78-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-77-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-76-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-75-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/568-74-0x0000000000100000-0x00000000001F1000-memory.dmp

              Filesize

              964KB

            • memory/2488-8-0x0000000000230000-0x0000000000243000-memory.dmp

              Filesize

              76KB

            • memory/2488-1-0x0000000000950000-0x0000000000A50000-memory.dmp

              Filesize

              1024KB

            • memory/2488-3-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2488-2-0x0000000000230000-0x0000000000243000-memory.dmp

              Filesize

              76KB

            • memory/2488-6-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2720-39-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-47-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-28-0x00000000000E0000-0x00000000000E6000-memory.dmp

              Filesize

              24KB

            • memory/2720-31-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-34-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-35-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-36-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-37-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-38-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-24-0x0000000001910000-0x0000000001B1F000-memory.dmp

              Filesize

              2.1MB

            • memory/2720-40-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-41-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-42-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-43-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-44-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-45-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-46-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-27-0x0000000001910000-0x0000000001B1F000-memory.dmp

              Filesize

              2.1MB

            • memory/2720-48-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-50-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-49-0x00000000000F0000-0x0000000000100000-memory.dmp

              Filesize

              64KB

            • memory/2720-51-0x0000000000350000-0x0000000000355000-memory.dmp

              Filesize

              20KB

            • memory/2720-54-0x0000000000350000-0x0000000000355000-memory.dmp

              Filesize

              20KB

            • memory/2720-55-0x0000000005960000-0x0000000005D6B000-memory.dmp

              Filesize

              4.0MB

            • memory/2720-58-0x0000000005960000-0x0000000005D6B000-memory.dmp

              Filesize

              4.0MB

            • memory/2720-59-0x0000000000560000-0x0000000000567000-memory.dmp

              Filesize

              28KB

            • memory/2720-23-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2720-21-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2720-20-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2720-18-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2720-12-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2720-15-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2720-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2824-16-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2824-11-0x0000000000400000-0x00000000004EA000-memory.dmp

              Filesize

              936KB

            • memory/2824-10-0x0000000000680000-0x0000000000780000-memory.dmp

              Filesize

              1024KB