Analysis

  • max time kernel
    145s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/10/2023, 05:23

General

  • Target

    file.exe

  • Size

    202KB

  • MD5

    0e912c89df4a4fce65d70506d0e7f233

  • SHA1

    e437ddd952485dab4dde33373c8dfc1d2cc8370d

  • SHA256

    45b199d7f3571172242647277be284df1a6fd3c4a01b084ec02bd9f661a8daf3

  • SHA512

    9063e2f1b35887ffeeeea778ac5881895ce50baa41635082b451dcbf40e81826e68f773649f36437a032769c81f80cf255f1fe6f8dd915aed2937ffa62978191

  • SSDEEP

    3072:/RqPDovM85s6O/z0U6Xz8nTNKYwPV4spZRvolZgw5HX/Vr:KDXIjkoU64R8dTRQlFPV

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

jotunheim.name

Signatures

  • Tofsee

    Backdoor/botnet which carries out malicious activities based on commands from a C2 server.

  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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 1 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).

  • Program crash 2 IoCs
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 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:788
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fqltwmwv\
      2⤵
        PID:1608
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wmmjvhxv.exe" C:\Windows\SysWOW64\fqltwmwv\
        2⤵
          PID:1652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fqltwmwv binPath= "C:\Windows\SysWOW64\fqltwmwv\wmmjvhxv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2348
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fqltwmwv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1328
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fqltwmwv
          2⤵
          • Launches sc.exe
          PID:4560
        • 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:2456
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 788 -s 1300
          2⤵
          • Program crash
          PID:4640
      • C:\Windows\SysWOW64\fqltwmwv\wmmjvhxv.exe
        C:\Windows\SysWOW64\fqltwmwv\wmmjvhxv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1656
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:1336
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1656 -s 520
          2⤵
          • Program crash
          PID:1944
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 788 -ip 788
        1⤵
          PID:3668
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1656 -ip 1656
          1⤵
            PID:1460

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  12.6MB

                  MD5

                  349ebcdd92851465752a200e8837548c

                  SHA1

                  6a2bec577eb8325593164945d4983602f785f4b0

                  SHA256

                  ea11ec2e4563a536b7beb069910cd5cbe9f265d440feac97e423c4bfdeaf2034

                  SHA512

                  5894c60bf33ca8fff5f92e8818a1f0634ca599b29d67e7538b2b86492d18e33355921bedc823ba66913a2c73ece3d7c9d303aab1c38f673ff5f7bdd4ae649314

                • C:\Windows\SysWOW64\fqltwmwv\wmmjvhxv.exe

                  Filesize

                  12.6MB

                  MD5

                  349ebcdd92851465752a200e8837548c

                  SHA1

                  6a2bec577eb8325593164945d4983602f785f4b0

                  SHA256

                  ea11ec2e4563a536b7beb069910cd5cbe9f265d440feac97e423c4bfdeaf2034

                  SHA512

                  5894c60bf33ca8fff5f92e8818a1f0634ca599b29d67e7538b2b86492d18e33355921bedc823ba66913a2c73ece3d7c9d303aab1c38f673ff5f7bdd4ae649314

                • memory/788-1-0x00000000005E0000-0x00000000006E0000-memory.dmp

                  Filesize

                  1024KB

                • memory/788-2-0x00000000022F0000-0x0000000002303000-memory.dmp

                  Filesize

                  76KB

                • memory/788-3-0x0000000000400000-0x00000000005A9000-memory.dmp

                  Filesize

                  1.7MB

                • memory/788-8-0x0000000000400000-0x00000000005A9000-memory.dmp

                  Filesize

                  1.7MB

                • memory/788-9-0x00000000022F0000-0x0000000002303000-memory.dmp

                  Filesize

                  76KB

                • memory/1336-33-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-38-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-12-0x0000000000660000-0x0000000000675000-memory.dmp

                  Filesize

                  84KB

                • memory/1336-16-0x0000000000660000-0x0000000000675000-memory.dmp

                  Filesize

                  84KB

                • memory/1336-17-0x0000000000660000-0x0000000000675000-memory.dmp

                  Filesize

                  84KB

                • memory/1336-56-0x00000000029E0000-0x00000000029E7000-memory.dmp

                  Filesize

                  28KB

                • memory/1336-20-0x0000000000660000-0x0000000000675000-memory.dmp

                  Filesize

                  84KB

                • memory/1336-21-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1336-24-0x0000000002400000-0x000000000260F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1336-25-0x0000000001BE0000-0x0000000001BE6000-memory.dmp

                  Filesize

                  24KB

                • memory/1336-28-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-31-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-32-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-55-0x0000000007440000-0x000000000784B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1336-34-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-35-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-36-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-52-0x0000000007440000-0x000000000784B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1336-37-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-39-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-40-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-41-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-42-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-44-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-43-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-45-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-46-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-47-0x0000000001BF0000-0x0000000001C00000-memory.dmp

                  Filesize

                  64KB

                • memory/1336-48-0x00000000029D0000-0x00000000029D5000-memory.dmp

                  Filesize

                  20KB

                • memory/1336-51-0x00000000029D0000-0x00000000029D5000-memory.dmp

                  Filesize

                  20KB

                • memory/1656-11-0x0000000000400000-0x00000000005A9000-memory.dmp

                  Filesize

                  1.7MB

                • memory/1656-10-0x00000000005C0000-0x00000000006C0000-memory.dmp

                  Filesize

                  1024KB

                • memory/1656-18-0x0000000000400000-0x00000000005A9000-memory.dmp

                  Filesize

                  1.7MB