Analysis

  • max time kernel
    150s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    05-06-2022 08:38

General

  • Target

    314f4da13b3a43ce3eddacf01d850f36.exe

  • Size

    307KB

  • MD5

    314f4da13b3a43ce3eddacf01d850f36

  • SHA1

    5f70d85a6bf37e5106a099040c658a77e7003b16

  • SHA256

    1cfe393c560cf7e17905bb2573ece065ffd587ffe3ec5efbbb43b326a39e3d51

  • SHA512

    2336c9af1ad364435ad7b5666727d60092f03a7ca15d4e655ffad5837caf06639286f9a3edc5cfbfa9b4c79e7cd4c6f97f8fe136e98e45250e90a96e3a714014

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\314f4da13b3a43ce3eddacf01d850f36.exe
    "C:\Users\Admin\AppData\Local\Temp\314f4da13b3a43ce3eddacf01d850f36.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1988
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pazflwsg\
      2⤵
        PID:2252
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qlvrfqv.exe" C:\Windows\SysWOW64\pazflwsg\
        2⤵
          PID:4128
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pazflwsg binPath= "C:\Windows\SysWOW64\pazflwsg\qlvrfqv.exe /d\"C:\Users\Admin\AppData\Local\Temp\314f4da13b3a43ce3eddacf01d850f36.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4232
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pazflwsg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3532
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pazflwsg
          2⤵
          • Launches sc.exe
          PID:4536
        • 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:4444
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1988 -s 1268
          2⤵
          • Program crash
          PID:1752
      • C:\Windows\SysWOW64\pazflwsg\qlvrfqv.exe
        C:\Windows\SysWOW64\pazflwsg\qlvrfqv.exe /d"C:\Users\Admin\AppData\Local\Temp\314f4da13b3a43ce3eddacf01d850f36.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1428
        • 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:4808
          • 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:4452
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1428 -s 560
          2⤵
          • Program crash
          PID:2748
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 1988 -ip 1988
        1⤵
          PID:1632
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 1428 -ip 1428
          1⤵
            PID:3680

          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\qlvrfqv.exe
            Filesize

            10.5MB

            MD5

            a04358b6065d5bd931cfa419aadc9029

            SHA1

            36538042355e84e76f16742bcee561ef18a22f88

            SHA256

            16c26e24ae96b453455da87c90351d566f6829a9a145bc466c2211873ecba65a

            SHA512

            fee2b2f7ad87d4c97d1cb4a76b6c897ab996ff4f1fec6abdc3d828ad4434ac085b5d4ab2f09f0432c40e7f401ddd54ee63114487df5fc6b67877ca2ebc4b5e59

          • C:\Windows\SysWOW64\pazflwsg\qlvrfqv.exe
            Filesize

            10.5MB

            MD5

            a04358b6065d5bd931cfa419aadc9029

            SHA1

            36538042355e84e76f16742bcee561ef18a22f88

            SHA256

            16c26e24ae96b453455da87c90351d566f6829a9a145bc466c2211873ecba65a

            SHA512

            fee2b2f7ad87d4c97d1cb4a76b6c897ab996ff4f1fec6abdc3d828ad4434ac085b5d4ab2f09f0432c40e7f401ddd54ee63114487df5fc6b67877ca2ebc4b5e59

          • memory/1428-148-0x0000000000400000-0x00000000004F2000-memory.dmp
            Filesize

            968KB

          • memory/1428-147-0x000000000062E000-0x000000000063E000-memory.dmp
            Filesize

            64KB

          • memory/1988-141-0x0000000000842000-0x0000000000852000-memory.dmp
            Filesize

            64KB

          • memory/1988-131-0x0000000000650000-0x0000000000663000-memory.dmp
            Filesize

            76KB

          • memory/1988-132-0x0000000000400000-0x00000000004F2000-memory.dmp
            Filesize

            968KB

          • memory/1988-130-0x0000000000842000-0x0000000000852000-memory.dmp
            Filesize

            64KB

          • memory/1988-142-0x0000000000400000-0x00000000004F2000-memory.dmp
            Filesize

            968KB

          • memory/2252-133-0x0000000000000000-mapping.dmp
          • memory/3532-137-0x0000000000000000-mapping.dmp
          • memory/4128-134-0x0000000000000000-mapping.dmp
          • memory/4232-136-0x0000000000000000-mapping.dmp
          • memory/4444-140-0x0000000000000000-mapping.dmp
          • memory/4452-175-0x0000000000C00000-0x0000000000CF1000-memory.dmp
            Filesize

            964KB

          • memory/4452-169-0x0000000000000000-mapping.dmp
          • memory/4452-170-0x0000000000C00000-0x0000000000CF1000-memory.dmp
            Filesize

            964KB

          • memory/4536-138-0x0000000000000000-mapping.dmp
          • memory/4808-144-0x00000000005B0000-0x00000000005C5000-memory.dmp
            Filesize

            84KB

          • memory/4808-151-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/4808-154-0x0000000001B20000-0x0000000001B26000-memory.dmp
            Filesize

            24KB

          • memory/4808-157-0x0000000001B30000-0x0000000001B40000-memory.dmp
            Filesize

            64KB

          • memory/4808-160-0x00000000029D0000-0x00000000029D5000-memory.dmp
            Filesize

            20KB

          • memory/4808-163-0x0000000007340000-0x000000000774B000-memory.dmp
            Filesize

            4.0MB

          • memory/4808-166-0x00000000029E0000-0x00000000029E7000-memory.dmp
            Filesize

            28KB

          • memory/4808-150-0x00000000005B0000-0x00000000005C5000-memory.dmp
            Filesize

            84KB

          • memory/4808-149-0x00000000005B0000-0x00000000005C5000-memory.dmp
            Filesize

            84KB

          • memory/4808-143-0x0000000000000000-mapping.dmp