Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 06:35

General

  • Target

    dd5f500d8b973980d0028c50dcbe83502bbc62979b3d5c7958eefa1ce0e7bae4.exe

  • Size

    263KB

  • MD5

    6c51b703f9be993a6e39f1fb9e86650e

  • SHA1

    c06e08a08c0152d0aa5646d9946fa6c27f681ac8

  • SHA256

    dd5f500d8b973980d0028c50dcbe83502bbc62979b3d5c7958eefa1ce0e7bae4

  • SHA512

    b840cec107ac81a7e2fc860959f9d54d8cccb7ac7c215a804dd8465562e1da19bc87122a308201e421e6958b2d1afbd8e1ca7e7ac9b42b1f797ef6516042d2ff

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\dd5f500d8b973980d0028c50dcbe83502bbc62979b3d5c7958eefa1ce0e7bae4.exe
    "C:\Users\Admin\AppData\Local\Temp\dd5f500d8b973980d0028c50dcbe83502bbc62979b3d5c7958eefa1ce0e7bae4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1100
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hdvauywx\
      2⤵
        PID:2804
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\admjldtw.exe" C:\Windows\SysWOW64\hdvauywx\
        2⤵
          PID:992
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hdvauywx binPath= "C:\Windows\SysWOW64\hdvauywx\admjldtw.exe /d\"C:\Users\Admin\AppData\Local\Temp\dd5f500d8b973980d0028c50dcbe83502bbc62979b3d5c7958eefa1ce0e7bae4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4320
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hdvauywx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3112
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hdvauywx
          2⤵
          • Launches sc.exe
          PID:3032
        • 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:4956
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1100 -s 772
          2⤵
          • Program crash
          PID:3568
      • C:\Windows\SysWOW64\hdvauywx\admjldtw.exe
        C:\Windows\SysWOW64\hdvauywx\admjldtw.exe /d"C:\Users\Admin\AppData\Local\Temp\dd5f500d8b973980d0028c50dcbe83502bbc62979b3d5c7958eefa1ce0e7bae4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4056
        • 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:1428
          • 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:3876
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4056 -s 512
          2⤵
          • Program crash
          PID:4388
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1100 -ip 1100
        1⤵
          PID:4000
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4056 -ip 4056
          1⤵
            PID:2088

          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\admjldtw.exe
            Filesize

            12.6MB

            MD5

            34282a635d1fdf0cfa81106a096adfd3

            SHA1

            fd9d54420e2508109d98717b2d2f5226cc143551

            SHA256

            7622095d52fabac23b63ede0548b53a8931cbb4098df5853dbdf457a28420e0d

            SHA512

            eb1078b54fb2a6da341d9fda8d1d8b057a1ff9864670f5fd71f4cbedbd6aade12e98d010f26012e5f64398c8318e554b42d6f20ef78526996f472b92b80b1050

          • C:\Windows\SysWOW64\hdvauywx\admjldtw.exe
            Filesize

            12.6MB

            MD5

            34282a635d1fdf0cfa81106a096adfd3

            SHA1

            fd9d54420e2508109d98717b2d2f5226cc143551

            SHA256

            7622095d52fabac23b63ede0548b53a8931cbb4098df5853dbdf457a28420e0d

            SHA512

            eb1078b54fb2a6da341d9fda8d1d8b057a1ff9864670f5fd71f4cbedbd6aade12e98d010f26012e5f64398c8318e554b42d6f20ef78526996f472b92b80b1050

          • memory/992-134-0x0000000000000000-mapping.dmp
          • memory/1100-130-0x0000000002EE2000-0x0000000002EF3000-memory.dmp
            Filesize

            68KB

          • memory/1100-131-0x00000000049D0000-0x00000000049E3000-memory.dmp
            Filesize

            76KB

          • memory/1100-133-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1100-142-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1100-141-0x0000000002EE2000-0x0000000002EF3000-memory.dmp
            Filesize

            68KB

          • memory/1428-155-0x00000000007B0000-0x00000000007B6000-memory.dmp
            Filesize

            24KB

          • memory/1428-151-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/1428-167-0x00000000007F0000-0x00000000007F7000-memory.dmp
            Filesize

            28KB

          • memory/1428-164-0x0000000006F80000-0x000000000738B000-memory.dmp
            Filesize

            4.0MB

          • memory/1428-161-0x00000000007E0000-0x00000000007E5000-memory.dmp
            Filesize

            20KB

          • memory/1428-143-0x0000000000000000-mapping.dmp
          • memory/1428-144-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/1428-158-0x00000000007D0000-0x00000000007E0000-memory.dmp
            Filesize

            64KB

          • memory/1428-152-0x0000000002000000-0x000000000220F000-memory.dmp
            Filesize

            2.1MB

          • memory/1428-149-0x00000000001A0000-0x00000000001B5000-memory.dmp
            Filesize

            84KB

          • memory/2804-132-0x0000000000000000-mapping.dmp
          • memory/3032-138-0x0000000000000000-mapping.dmp
          • memory/3112-137-0x0000000000000000-mapping.dmp
          • memory/3876-171-0x0000000001200000-0x00000000012F1000-memory.dmp
            Filesize

            964KB

          • memory/3876-170-0x0000000000000000-mapping.dmp
          • memory/3876-176-0x0000000001200000-0x00000000012F1000-memory.dmp
            Filesize

            964KB

          • memory/4056-150-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4056-148-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4056-147-0x0000000002F1E000-0x0000000002F2E000-memory.dmp
            Filesize

            64KB

          • memory/4320-136-0x0000000000000000-mapping.dmp
          • memory/4956-139-0x0000000000000000-mapping.dmp