Analysis

  • max time kernel
    147s
  • max time network
    155s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231025-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231025-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19/11/2023, 22:10

General

  • Target

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe

  • Size

    265KB

  • MD5

    695c14c51ae9ff59157cf69f97b2d1cc

  • SHA1

    4688eea11efa5c61c7704b5ca80196eb9099e867

  • SHA256

    f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1

  • SHA512

    e43e45420544f2fd736f2427443941f1da5b8d4a74d4c9d2e0a95c8306b2f10e12beaa6b0c2ec2715ecbd66b41431f404c942c32720a8b3ee2afa640657d4688

  • SSDEEP

    3072:d6LaowspCAE+mYgDxv5l7Iek5Ym7IQoiteVFWbVD22WsgAsR6c7ovb3TQh9:SaWCAF5Cf7Iem57InitGMxycQMrT

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.

  • 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
  • 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\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe
    "C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3504
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\cyiadjfs\
      2⤵
        PID:2984
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\amydagft.exe" C:\Windows\SysWOW64\cyiadjfs\
        2⤵
          PID:3408
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create cyiadjfs binPath= "C:\Windows\SysWOW64\cyiadjfs\amydagft.exe /d\"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1768
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description cyiadjfs "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:608
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start cyiadjfs
          2⤵
          • Launches sc.exe
          PID:1548
        • 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:1384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3504 -s 1052
          2⤵
          • Program crash
          PID:4600
      • C:\Windows\SysWOW64\cyiadjfs\amydagft.exe
        C:\Windows\SysWOW64\cyiadjfs\amydagft.exe /d"C:\Users\Admin\AppData\Local\Temp\f2b4ea5a8678e6b4ff70b238e34a208f4287f113ba6a65c12592a01cf9cf17c1.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3480
        • 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:4196
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3480 -s 532
          2⤵
          • Program crash
          PID:376
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 3504 -ip 3504
        1⤵
          PID:3724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 3480 -ip 3480
          1⤵
            PID:4676

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  11.1MB

                  MD5

                  7873285111518020edf80bdae752f4f8

                  SHA1

                  1829cb82209ac0b28dd64a29a53122602e0038ba

                  SHA256

                  2ec02509c1534a2a7073264e34591e7bb30b55d80ba12a8e2c77170fe693c447

                  SHA512

                  b265748a9452933a22972f0b1439630dffaf06d6658c63b2bb785eabd4a3e695dcef4b17dc4802f57f9e68378eb8bbb5f9c9f9ade70e093336df81df0d6bbd2a

                • C:\Windows\SysWOW64\cyiadjfs\amydagft.exe

                  Filesize

                  11.1MB

                  MD5

                  7873285111518020edf80bdae752f4f8

                  SHA1

                  1829cb82209ac0b28dd64a29a53122602e0038ba

                  SHA256

                  2ec02509c1534a2a7073264e34591e7bb30b55d80ba12a8e2c77170fe693c447

                  SHA512

                  b265748a9452933a22972f0b1439630dffaf06d6658c63b2bb785eabd4a3e695dcef4b17dc4802f57f9e68378eb8bbb5f9c9f9ade70e093336df81df0d6bbd2a

                • memory/3480-17-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/3480-10-0x00000000006B0000-0x00000000007B0000-memory.dmp

                  Filesize

                  1024KB

                • memory/3480-12-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/3504-2-0x0000000002260000-0x0000000002273000-memory.dmp

                  Filesize

                  76KB

                • memory/3504-3-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/3504-7-0x0000000000400000-0x00000000004F6000-memory.dmp

                  Filesize

                  984KB

                • memory/3504-8-0x0000000002260000-0x0000000002273000-memory.dmp

                  Filesize

                  76KB

                • memory/3504-1-0x0000000000520000-0x0000000000620000-memory.dmp

                  Filesize

                  1024KB

                • memory/4196-31-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-36-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-18-0x0000000000420000-0x0000000000435000-memory.dmp

                  Filesize

                  84KB

                • memory/4196-15-0x0000000000420000-0x0000000000435000-memory.dmp

                  Filesize

                  84KB

                • memory/4196-20-0x0000000002000000-0x000000000220F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4196-23-0x0000000002000000-0x000000000220F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/4196-24-0x00000000005F0000-0x00000000005F6000-memory.dmp

                  Filesize

                  24KB

                • memory/4196-27-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-30-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-32-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-11-0x0000000000420000-0x0000000000435000-memory.dmp

                  Filesize

                  84KB

                • memory/4196-34-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-33-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-35-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-37-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-16-0x0000000000420000-0x0000000000435000-memory.dmp

                  Filesize

                  84KB

                • memory/4196-38-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-40-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-39-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-41-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-43-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-42-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-44-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-45-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-46-0x00000000017E0000-0x00000000017F0000-memory.dmp

                  Filesize

                  64KB

                • memory/4196-47-0x00000000017F0000-0x00000000017F5000-memory.dmp

                  Filesize

                  20KB

                • memory/4196-50-0x00000000017F0000-0x00000000017F5000-memory.dmp

                  Filesize

                  20KB

                • memory/4196-51-0x0000000007000000-0x000000000740B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4196-54-0x0000000007000000-0x000000000740B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/4196-55-0x00000000025D0000-0x00000000025D7000-memory.dmp

                  Filesize

                  28KB

                • memory/4196-59-0x0000000000420000-0x0000000000435000-memory.dmp

                  Filesize

                  84KB