Analysis

  • max time kernel
    150s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20231023-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20231023-enlocale:en-usos:windows10-2004-x64system
  • submitted
    05/11/2023, 14:14

General

  • Target

    file.exe

  • Size

    259KB

  • MD5

    52bfbbeea419b32453306fbe9978576a

  • SHA1

    a357439bd75ddf0f398d002cbb04e41182c225e5

  • SHA256

    49d338bc0aff700c861cea2620b98d673f0378a8c0813275722e08933bf0cf07

  • SHA512

    a3419cefc4eae81026b514156b81a979eae42934d7c80b5c1c733efa9143b5b637412bdcf2b33ca330de3b1a0c0221e7340799b8b00883149951ab47110ff8a2

  • SSDEEP

    3072:kVX+o2rgL565qeKPYBMaSTC4KGBQoHt7Erjazbach5lh60keCUj:8+7gLYUFYBDRuUjazb5h6TM

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 4 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:2536
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qhvmttmi\
      2⤵
        PID:2088
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ziozxme.exe" C:\Windows\SysWOW64\qhvmttmi\
        2⤵
          PID:1728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create qhvmttmi binPath= "C:\Windows\SysWOW64\qhvmttmi\ziozxme.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1072
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description qhvmttmi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4996
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start qhvmttmi
          2⤵
          • Launches sc.exe
          PID:4024
        • 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:4792
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 1212
          2⤵
          • Program crash
          PID:4568
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 1232
          2⤵
          • Program crash
          PID:2004
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2536 -s 640
          2⤵
          • Program crash
          PID:1684
      • C:\Windows\SysWOW64\qhvmttmi\ziozxme.exe
        C:\Windows\SysWOW64\qhvmttmi\ziozxme.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:740
        • 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:4852
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 740 -s 520
          2⤵
          • Program crash
          PID:3672
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 436 -p 2536 -ip 2536
        1⤵
          PID:1992
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 428 -p 2536 -ip 2536
          1⤵
            PID:3960
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 520 -p 740 -ip 740
            1⤵
              PID:852
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 548 -p 2536 -ip 2536
              1⤵
                PID:4840

              Network

                    MITRE ATT&CK Enterprise v15

                    Replay Monitor

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                    Downloads

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

                      Filesize

                      11.0MB

                      MD5

                      1fda1a24d0df3368f01a09b68653366b

                      SHA1

                      9e72d6b6181f0747521d999a05d2e62cdade3085

                      SHA256

                      fe41a8646c6291cf167a2690337da6ee60f3e43f686aec5f158e4d5be4ffb7b5

                      SHA512

                      b0af19c33693a10b542a8f860a248421de6957d0a541386c68875af8cf59ac916b0c9d57d070aba896a1dc4070fa6c86f21e5a055784227f2a2bd4846f3bda85

                    • C:\Windows\SysWOW64\qhvmttmi\ziozxme.exe

                      Filesize

                      11.0MB

                      MD5

                      1fda1a24d0df3368f01a09b68653366b

                      SHA1

                      9e72d6b6181f0747521d999a05d2e62cdade3085

                      SHA256

                      fe41a8646c6291cf167a2690337da6ee60f3e43f686aec5f158e4d5be4ffb7b5

                      SHA512

                      b0af19c33693a10b542a8f860a248421de6957d0a541386c68875af8cf59ac916b0c9d57d070aba896a1dc4070fa6c86f21e5a055784227f2a2bd4846f3bda85

                    • memory/740-15-0x0000000000760000-0x0000000000773000-memory.dmp

                      Filesize

                      76KB

                    • memory/740-8-0x00000000007C0000-0x00000000008C0000-memory.dmp

                      Filesize

                      1024KB

                    • memory/740-9-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/740-14-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/2536-2-0x0000000002240000-0x0000000002253000-memory.dmp

                      Filesize

                      76KB

                    • memory/2536-3-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/2536-1-0x00000000005A0000-0x00000000006A0000-memory.dmp

                      Filesize

                      1024KB

                    • memory/2536-16-0x0000000000400000-0x00000000004F3000-memory.dmp

                      Filesize

                      972KB

                    • memory/4852-32-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-37-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-17-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                      Filesize

                      84KB

                    • memory/4852-18-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                      Filesize

                      84KB

                    • memory/4852-20-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                      Filesize

                      84KB

                    • memory/4852-21-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/4852-24-0x0000000002A00000-0x0000000002C0F000-memory.dmp

                      Filesize

                      2.1MB

                    • memory/4852-25-0x0000000002160000-0x0000000002166000-memory.dmp

                      Filesize

                      24KB

                    • memory/4852-28-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-31-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-10-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                      Filesize

                      84KB

                    • memory/4852-33-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-34-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-36-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-35-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-13-0x0000000000BB0000-0x0000000000BC5000-memory.dmp

                      Filesize

                      84KB

                    • memory/4852-38-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-39-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-40-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-41-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-42-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-43-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-44-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-45-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-46-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-47-0x0000000002170000-0x0000000002180000-memory.dmp

                      Filesize

                      64KB

                    • memory/4852-48-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                      Filesize

                      20KB

                    • memory/4852-51-0x0000000002FD0000-0x0000000002FD5000-memory.dmp

                      Filesize

                      20KB

                    • memory/4852-52-0x0000000007980000-0x0000000007D8B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/4852-55-0x0000000007980000-0x0000000007D8B000-memory.dmp

                      Filesize

                      4.0MB

                    • memory/4852-56-0x0000000002FE0000-0x0000000002FE7000-memory.dmp

                      Filesize

                      28KB