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
    05/11/2023, 15:09

General

  • Target

    file.exe

  • Size

    252KB

  • MD5

    3daff0208eb4ec8e45c0d84c90b959b8

  • SHA1

    5cfca7fd7003e8a8e25dbdebff2a0113a4c44d4b

  • SHA256

    a024dc3f72c20bbc40fadda609ea7589f757f3078022d990878d09e2ad7b0c11

  • SHA512

    594a8c7c3b7dea0d669684171a6e228ae80e9e0aa426b3c550c855ec8edf43e4f4dcfa2955099c3bc07f6244cf500f85fde8473a2210f968f3aa913609292453

  • SSDEEP

    6144:eAdQSLr8EGVwrXM9d3AX09WKVLsH26gI:oSHRGVwrXM9d3v9WKVgW4

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
  • 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:4980
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\gjkkpdgb\
      2⤵
        PID:1372
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qxwjrrzd.exe" C:\Windows\SysWOW64\gjkkpdgb\
        2⤵
          PID:2448
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create gjkkpdgb binPath= "C:\Windows\SysWOW64\gjkkpdgb\qxwjrrzd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4508
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description gjkkpdgb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2344
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start gjkkpdgb
          2⤵
          • Launches sc.exe
          PID:3500
        • 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:2108
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4980 -s 892
          2⤵
          • Program crash
          PID:2076
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4980 -ip 4980
        1⤵
          PID:4472
        • C:\Windows\SysWOW64\gjkkpdgb\qxwjrrzd.exe
          C:\Windows\SysWOW64\gjkkpdgb\qxwjrrzd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3632
          • 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:1692
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3632 -s 520
            2⤵
            • Program crash
            PID:988
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 3632 -ip 3632
          1⤵
            PID:1644

          Network

                MITRE ATT&CK Enterprise v15

                Replay Monitor

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                Downloads

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

                  Filesize

                  13.4MB

                  MD5

                  b73a30328568572daae7ad00fb48a50d

                  SHA1

                  3baf6deab33ce4552065eb333c6217f93e53074d

                  SHA256

                  5ef2d1cfe77bc8f294409601ad0a032a1e977d12854df68c6fc4581a2698ee24

                  SHA512

                  5997696798f3ac93094df2a79cfe15a3c329b3b0383b19204938d0267518587a54fab90e881471368bcff2f2fada182b5238c23240880c80e2ea1775eefbef06

                • C:\Windows\SysWOW64\gjkkpdgb\qxwjrrzd.exe

                  Filesize

                  13.4MB

                  MD5

                  b73a30328568572daae7ad00fb48a50d

                  SHA1

                  3baf6deab33ce4552065eb333c6217f93e53074d

                  SHA256

                  5ef2d1cfe77bc8f294409601ad0a032a1e977d12854df68c6fc4581a2698ee24

                  SHA512

                  5997696798f3ac93094df2a79cfe15a3c329b3b0383b19204938d0267518587a54fab90e881471368bcff2f2fada182b5238c23240880c80e2ea1775eefbef06

                • memory/1692-43-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-29-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-57-0x0000000002BE0000-0x0000000002BE7000-memory.dmp

                  Filesize

                  28KB

                • memory/1692-56-0x0000000007700000-0x0000000007B0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1692-53-0x0000000007700000-0x0000000007B0B000-memory.dmp

                  Filesize

                  4.0MB

                • memory/1692-52-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

                  Filesize

                  20KB

                • memory/1692-13-0x0000000000930000-0x0000000000945000-memory.dmp

                  Filesize

                  84KB

                • memory/1692-49-0x0000000002BD0000-0x0000000002BD5000-memory.dmp

                  Filesize

                  20KB

                • memory/1692-48-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-17-0x0000000000930000-0x0000000000945000-memory.dmp

                  Filesize

                  84KB

                • memory/1692-18-0x0000000000930000-0x0000000000945000-memory.dmp

                  Filesize

                  84KB

                • memory/1692-47-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-21-0x0000000000930000-0x0000000000945000-memory.dmp

                  Filesize

                  84KB

                • memory/1692-22-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1692-25-0x0000000002800000-0x0000000002A0F000-memory.dmp

                  Filesize

                  2.1MB

                • memory/1692-26-0x00000000009F0000-0x00000000009F6000-memory.dmp

                  Filesize

                  24KB

                • memory/1692-33-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-32-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-46-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-34-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-38-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-37-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-36-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-35-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-40-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-41-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-39-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-42-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-45-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/1692-44-0x0000000001FF0000-0x0000000002000000-memory.dmp

                  Filesize

                  64KB

                • memory/3632-19-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/3632-12-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/3632-8-0x0000000000640000-0x0000000000740000-memory.dmp

                  Filesize

                  1024KB

                • memory/4980-2-0x00000000005D0000-0x00000000005E3000-memory.dmp

                  Filesize

                  76KB

                • memory/4980-3-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/4980-11-0x00000000005D0000-0x00000000005E3000-memory.dmp

                  Filesize

                  76KB

                • memory/4980-10-0x0000000000600000-0x0000000000700000-memory.dmp

                  Filesize

                  1024KB

                • memory/4980-9-0x0000000000400000-0x00000000004F3000-memory.dmp

                  Filesize

                  972KB

                • memory/4980-1-0x0000000000600000-0x0000000000700000-memory.dmp

                  Filesize

                  1024KB