Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    19-06-2022 14:58

General

  • Target

    d7e0bfa33b1989728b6a5ebdb51a5009403dff031ef23597f0723b179b86dfe4.exe

  • Size

    306KB

  • MD5

    aeb1e223fffe3774b5eb183f44f10acc

  • SHA1

    f74a58f39acd849d9797a0820b5207b794e2ed29

  • SHA256

    d7e0bfa33b1989728b6a5ebdb51a5009403dff031ef23597f0723b179b86dfe4

  • SHA512

    aeeae0d134fab71775a40f2405df28a847d5c259d9896a50765d002e7352e522658bd8beef1f05907b0d3fc59ed07cb426ac45fd2d8aa123256e4c0c326c5db1

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\d7e0bfa33b1989728b6a5ebdb51a5009403dff031ef23597f0723b179b86dfe4.exe
    "C:\Users\Admin\AppData\Local\Temp\d7e0bfa33b1989728b6a5ebdb51a5009403dff031ef23597f0723b179b86dfe4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2708
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\jbthurwb\
      2⤵
        PID:4232
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\saxouyzk.exe" C:\Windows\SysWOW64\jbthurwb\
        2⤵
          PID:2724
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create jbthurwb binPath= "C:\Windows\SysWOW64\jbthurwb\saxouyzk.exe /d\"C:\Users\Admin\AppData\Local\Temp\d7e0bfa33b1989728b6a5ebdb51a5009403dff031ef23597f0723b179b86dfe4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3044
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description jbthurwb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start jbthurwb
          2⤵
          • Launches sc.exe
          PID:3644
        • 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:3468
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2708 -s 1048
          2⤵
          • Program crash
          PID:1496
      • C:\Windows\SysWOW64\jbthurwb\saxouyzk.exe
        C:\Windows\SysWOW64\jbthurwb\saxouyzk.exe /d"C:\Users\Admin\AppData\Local\Temp\d7e0bfa33b1989728b6a5ebdb51a5009403dff031ef23597f0723b179b86dfe4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:436
        • 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:1356
          • 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:2136
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 436 -s 560
          2⤵
          • Program crash
          PID:4320
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2708 -ip 2708
        1⤵
          PID:448
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 436 -ip 436
          1⤵
            PID:4988

          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\saxouyzk.exe
            Filesize

            14.0MB

            MD5

            7a982f993b26aae17f48fc71aa2af5c0

            SHA1

            f298d7a04e63998b223c9638e8b0a42e681e95a9

            SHA256

            b189541751648e37a2958986390e21c110150e1765b1d7963309d5ddcc51db42

            SHA512

            feae66fb067aaee78878d6ea4535508084082fbcd809d167893ed8ca2307fe632f8d1be009a571e40d21247415289fb06d2b8d135f5a8cf9a6c35c6d00a88716

          • C:\Windows\SysWOW64\jbthurwb\saxouyzk.exe
            Filesize

            14.0MB

            MD5

            7a982f993b26aae17f48fc71aa2af5c0

            SHA1

            f298d7a04e63998b223c9638e8b0a42e681e95a9

            SHA256

            b189541751648e37a2958986390e21c110150e1765b1d7963309d5ddcc51db42

            SHA512

            feae66fb067aaee78878d6ea4535508084082fbcd809d167893ed8ca2307fe632f8d1be009a571e40d21247415289fb06d2b8d135f5a8cf9a6c35c6d00a88716

          • memory/436-147-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/436-145-0x0000000002DEA000-0x0000000002DF8000-memory.dmp
            Filesize

            56KB

          • memory/1356-157-0x0000000001740000-0x0000000001750000-memory.dmp
            Filesize

            64KB

          • memory/1356-166-0x00000000017E0000-0x00000000017E7000-memory.dmp
            Filesize

            28KB

          • memory/1356-163-0x0000000007380000-0x000000000778B000-memory.dmp
            Filesize

            4.0MB

          • memory/1356-160-0x00000000017D0000-0x00000000017D5000-memory.dmp
            Filesize

            20KB

          • memory/1356-149-0x00000000001B0000-0x00000000001C5000-memory.dmp
            Filesize

            84KB

          • memory/1356-154-0x0000000001730000-0x0000000001736000-memory.dmp
            Filesize

            24KB

          • memory/1356-142-0x00000000001B0000-0x00000000001C5000-memory.dmp
            Filesize

            84KB

          • memory/1356-141-0x0000000000000000-mapping.dmp
          • memory/1356-151-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/1356-150-0x00000000001B0000-0x00000000001C5000-memory.dmp
            Filesize

            84KB

          • memory/2136-169-0x0000000000000000-mapping.dmp
          • memory/2136-170-0x0000000000610000-0x0000000000701000-memory.dmp
            Filesize

            964KB

          • memory/2136-175-0x0000000000610000-0x0000000000701000-memory.dmp
            Filesize

            964KB

          • memory/2708-146-0x0000000002F9E000-0x0000000002FAC000-memory.dmp
            Filesize

            56KB

          • memory/2708-148-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/2708-130-0x0000000002F9E000-0x0000000002FAC000-memory.dmp
            Filesize

            56KB

          • memory/2708-132-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/2708-131-0x0000000002F00000-0x0000000002F13000-memory.dmp
            Filesize

            76KB

          • memory/2724-134-0x0000000000000000-mapping.dmp
          • memory/3044-136-0x0000000000000000-mapping.dmp
          • memory/3468-140-0x0000000000000000-mapping.dmp
          • memory/3644-138-0x0000000000000000-mapping.dmp
          • memory/4232-133-0x0000000000000000-mapping.dmp
          • memory/4804-137-0x0000000000000000-mapping.dmp