Analysis

  • max time kernel
    148s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240412-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240412-enlocale:en-usos:windows10-2004-x64system
  • submitted
    17-04-2024 13:33

General

  • Target

    f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe

  • Size

    232KB

  • MD5

    b5f3dc95c09fa3bfdf009a404736f94e

  • SHA1

    03e471e7edf9bbcbe2483ebd1ba05364c93a190a

  • SHA256

    f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be

  • SHA512

    f63cba660384d5296e2f8aeeceba1a2d4707311a242cd5f12220008670cb5c2bf686b546fafe03cc6c5363bd62fe4c067a1f9dc73a8388488e13854b631ee546

  • SSDEEP

    6144:j6zxC0r84BWnfZUH7SFcQU+9HFsvKMXOCU:kY0r9BeZUbSiy9HSvKwO

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 2 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.

  • Deletes itself 1 IoCs
  • Executes dropped EXE 1 IoCs
  • 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
  • Modifies data under HKEY_USERS 7 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe
    "C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4120
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gfklaqxa\
      2⤵
        PID:4664
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\rurkbdxn.exe" C:\Windows\SysWOW64\gfklaqxa\
        2⤵
          PID:1472
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gfklaqxa binPath= "C:\Windows\SysWOW64\gfklaqxa\rurkbdxn.exe /d\"C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4088
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gfklaqxa "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5092
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gfklaqxa
          2⤵
          • Launches sc.exe
          PID:4780
        • 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:2280
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4120 -s 644
          2⤵
          • Program crash
          PID:4652
      • C:\Windows\SysWOW64\gfklaqxa\rurkbdxn.exe
        C:\Windows\SysWOW64\gfklaqxa\rurkbdxn.exe /d"C:\Users\Admin\AppData\Local\Temp\f379c2c732470dbce8e17423baf7f6fcca63bcb13c4ade33a15df1225e3841be.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3980
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Deletes itself
          • Drops file in System32 directory
          • Modifies data under HKEY_USERS
          PID:2848
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3980 -s 528
          2⤵
          • Program crash
          PID:2776
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 3980 -ip 3980
        1⤵
          PID:804
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 556 -p 4120 -ip 4120
          1⤵
            PID:4740

          Network

          MITRE ATT&CK Matrix ATT&CK v13

          Persistence

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Privilege Escalation

          Create or Modify System Process

          2
          T1543

          Windows Service

          2
          T1543.003

          Boot or Logon Autostart Execution

          1
          T1547

          Registry Run Keys / Startup Folder

          1
          T1547.001

          Defense Evasion

          Impair Defenses

          1
          T1562

          Disable or Modify System Firewall

          1
          T1562.004

          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\rurkbdxn.exe
            Filesize

            10.0MB

            MD5

            253c555e0aa35e5db3b756fa6e68151f

            SHA1

            75400fb0ca2aea4ba73e094055c4502c4f2bba27

            SHA256

            8a1b9bfc66537f57d51c16244bde42c7308c45ecadead058f8973b378ad42fdd

            SHA512

            5c60d31dde21231635edfbe06cf46f202f1c3d1a98037ce7d9910d47edf2619c771b388aff232eb5b2385e8212c9ec34630320aa1b32776756cbce74ea2d4413

          • memory/2848-47-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-43-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-56-0x00000000031F0000-0x00000000031F7000-memory.dmp
            Filesize

            28KB

          • memory/2848-31-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-40-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-41-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-11-0x00000000007E0000-0x00000000007F5000-memory.dmp
            Filesize

            84KB

          • memory/2848-14-0x00000000007E0000-0x00000000007F5000-memory.dmp
            Filesize

            84KB

          • memory/2848-42-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-33-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-17-0x00000000007E0000-0x00000000007F5000-memory.dmp
            Filesize

            84KB

          • memory/2848-18-0x00000000007E0000-0x00000000007F5000-memory.dmp
            Filesize

            84KB

          • memory/2848-20-0x00000000007E0000-0x00000000007F5000-memory.dmp
            Filesize

            84KB

          • memory/2848-34-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-24-0x0000000002700000-0x000000000290F000-memory.dmp
            Filesize

            2.1MB

          • memory/2848-28-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-25-0x0000000000BF0000-0x0000000000BF6000-memory.dmp
            Filesize

            24KB

          • memory/2848-32-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-55-0x0000000007D40000-0x000000000814B000-memory.dmp
            Filesize

            4.0MB

          • memory/2848-44-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-21-0x0000000002700000-0x000000000290F000-memory.dmp
            Filesize

            2.1MB

          • memory/2848-35-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-36-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-37-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-38-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-39-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-52-0x0000000007D40000-0x000000000814B000-memory.dmp
            Filesize

            4.0MB

          • memory/2848-51-0x00000000031E0000-0x00000000031E5000-memory.dmp
            Filesize

            20KB

          • memory/2848-48-0x00000000031E0000-0x00000000031E5000-memory.dmp
            Filesize

            20KB

          • memory/2848-45-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/2848-46-0x0000000001DE0000-0x0000000001DF0000-memory.dmp
            Filesize

            64KB

          • memory/3980-15-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3980-10-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/3980-9-0x00000000005A0000-0x00000000005B3000-memory.dmp
            Filesize

            76KB

          • memory/3980-8-0x00000000005E0000-0x00000000006E0000-memory.dmp
            Filesize

            1024KB

          • memory/4120-1-0x00000000004E0000-0x00000000005E0000-memory.dmp
            Filesize

            1024KB

          • memory/4120-4-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/4120-16-0x0000000000400000-0x000000000043F000-memory.dmp
            Filesize

            252KB

          • memory/4120-2-0x0000000002190000-0x00000000021A3000-memory.dmp
            Filesize

            76KB