Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    14-06-2022 19:41

General

  • Target

    6458cb95902e65e6641bdde798efa3cf523dae3464c681666b0509c757d74074.exe

  • Size

    287KB

  • MD5

    4e089f4c1806595493a3452902d12194

  • SHA1

    69d62ac483465040f54388ff023c0714ea7b2ceb

  • SHA256

    6458cb95902e65e6641bdde798efa3cf523dae3464c681666b0509c757d74074

  • SHA512

    aee92d602054a0f77d7971ad1d22b82ba738df65b52bfb9643c204a5162a889e48bf263435fe17eefcc8efe596122d99d1b1726c69104fd035c8a80c2938f784

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\6458cb95902e65e6641bdde798efa3cf523dae3464c681666b0509c757d74074.exe
    "C:\Users\Admin\AppData\Local\Temp\6458cb95902e65e6641bdde798efa3cf523dae3464c681666b0509c757d74074.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2896
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\quvvnxai\
      2⤵
        PID:4268
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ygyixiql.exe" C:\Windows\SysWOW64\quvvnxai\
        2⤵
          PID:2064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create quvvnxai binPath= "C:\Windows\SysWOW64\quvvnxai\ygyixiql.exe /d\"C:\Users\Admin\AppData\Local\Temp\6458cb95902e65e6641bdde798efa3cf523dae3464c681666b0509c757d74074.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4408
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description quvvnxai "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4276
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start quvvnxai
          2⤵
          • Launches sc.exe
          PID:4252
        • 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:4512
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2896 -s 580
          2⤵
          • Program crash
          PID:5084
      • C:\Windows\SysWOW64\quvvnxai\ygyixiql.exe
        C:\Windows\SysWOW64\quvvnxai\ygyixiql.exe /d"C:\Users\Admin\AppData\Local\Temp\6458cb95902e65e6641bdde798efa3cf523dae3464c681666b0509c757d74074.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4864
        • 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:1576
          • 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:4452
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4864 -s 512
          2⤵
          • Program crash
          PID:1404
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 2896 -ip 2896
        1⤵
          PID:5088
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4864 -ip 4864
          1⤵
            PID:1464

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          Modify Registry

          1
          T1112

          Discovery

          Query Registry

          1
          T1012

          System Information Discovery

          2
          T1082

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\ygyixiql.exe
            Filesize

            13.4MB

            MD5

            2a6e8ffc5dcb8d9c4ee803c7c77d9ffd

            SHA1

            2ca04f16defa52cc1f1b49e1371f270edf2a1866

            SHA256

            2ee7d76147f11d80775660b57fb0220f1ef72137bd17b1551e72b911caea5c15

            SHA512

            6e245e5afde2a3a45010a6126259aeb79c5ad2277c354b2308c63f7f8adf54e286a5c38a94a4cc6f52287c94cb8e1a96a0870952b4843b824f6d7ebfd0b5dbff

          • C:\Windows\SysWOW64\quvvnxai\ygyixiql.exe
            Filesize

            13.4MB

            MD5

            2a6e8ffc5dcb8d9c4ee803c7c77d9ffd

            SHA1

            2ca04f16defa52cc1f1b49e1371f270edf2a1866

            SHA256

            2ee7d76147f11d80775660b57fb0220f1ef72137bd17b1551e72b911caea5c15

            SHA512

            6e245e5afde2a3a45010a6126259aeb79c5ad2277c354b2308c63f7f8adf54e286a5c38a94a4cc6f52287c94cb8e1a96a0870952b4843b824f6d7ebfd0b5dbff

          • memory/1576-145-0x0000000000000000-mapping.dmp
          • memory/1576-155-0x0000000001F70000-0x0000000001F76000-memory.dmp
            Filesize

            24KB

          • memory/1576-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1576-151-0x0000000000C00000-0x0000000000C15000-memory.dmp
            Filesize

            84KB

          • memory/1576-150-0x0000000000C00000-0x0000000000C15000-memory.dmp
            Filesize

            84KB

          • memory/1576-158-0x0000000001F80000-0x0000000001F90000-memory.dmp
            Filesize

            64KB

          • memory/1576-146-0x0000000000C00000-0x0000000000C15000-memory.dmp
            Filesize

            84KB

          • memory/1576-161-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/1576-164-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/1576-167-0x0000000002FD0000-0x0000000002FD7000-memory.dmp
            Filesize

            28KB

          • memory/2064-135-0x0000000000000000-mapping.dmp
          • memory/2896-142-0x0000000000400000-0x0000000000B3B000-memory.dmp
            Filesize

            7.2MB

          • memory/2896-131-0x0000000000DD0000-0x0000000000DE3000-memory.dmp
            Filesize

            76KB

          • memory/2896-130-0x0000000000EB8000-0x0000000000EC9000-memory.dmp
            Filesize

            68KB

          • memory/2896-132-0x0000000000400000-0x0000000000B3B000-memory.dmp
            Filesize

            7.2MB

          • memory/2896-134-0x0000000000EB8000-0x0000000000EC9000-memory.dmp
            Filesize

            68KB

          • memory/4252-139-0x0000000000000000-mapping.dmp
          • memory/4268-133-0x0000000000000000-mapping.dmp
          • memory/4276-138-0x0000000000000000-mapping.dmp
          • memory/4408-137-0x0000000000000000-mapping.dmp
          • memory/4452-170-0x0000000000000000-mapping.dmp
          • memory/4452-171-0x0000000001050000-0x0000000001141000-memory.dmp
            Filesize

            964KB

          • memory/4452-176-0x0000000001050000-0x0000000001141000-memory.dmp
            Filesize

            964KB

          • memory/4512-141-0x0000000000000000-mapping.dmp
          • memory/4864-149-0x0000000000400000-0x0000000000B3B000-memory.dmp
            Filesize

            7.2MB

          • memory/4864-144-0x0000000000400000-0x0000000000B3B000-memory.dmp
            Filesize

            7.2MB

          • memory/4864-143-0x0000000000D43000-0x0000000000D53000-memory.dmp
            Filesize

            64KB