Analysis

  • max time kernel
    147s
  • max time network
    163s
  • 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 12:58

General

  • Target

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe

  • Size

    227KB

  • MD5

    1010b86bd744c31ecef5f5aeae5ca6df

  • SHA1

    79dbaab22a85e8a0c3124d39423da1ca24c358e8

  • SHA256

    a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de

  • SHA512

    6823068623029c10aa0d833be8422b6d93663832d24298bd9811f7700bbc56dc5463fd75f12273e2168bac6784a16e735cc86cf0de8841e83c1befc75bdfd02d

  • SSDEEP

    3072:BG/VLLNVnlMoDjq0sg0lpb15L76ZhBUrIeGskK+KgPcf53whT5A/hTu:8Lh9ljdOlPB6tUrIK+zPcRaCpT

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\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe
    "C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3572
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ghhjkqdv\
      2⤵
        PID:3580
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\cowtzmsq.exe" C:\Windows\SysWOW64\ghhjkqdv\
        2⤵
          PID:5004
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ghhjkqdv binPath= "C:\Windows\SysWOW64\ghhjkqdv\cowtzmsq.exe /d\"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ghhjkqdv "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3116
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ghhjkqdv
          2⤵
          • Launches sc.exe
          PID:3348
        • 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:912
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3572 -s 1040
          2⤵
          • Program crash
          PID:1956
      • C:\Windows\SysWOW64\ghhjkqdv\cowtzmsq.exe
        C:\Windows\SysWOW64\ghhjkqdv\cowtzmsq.exe /d"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4092
        • 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:4184
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4092 -s 528
          2⤵
          • Program crash
          PID:3992
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 3572 -ip 3572
        1⤵
          PID:1824
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 516 -p 4092 -ip 4092
          1⤵
            PID:4732

          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\cowtzmsq.exe
            Filesize

            12.4MB

            MD5

            30842671563311151424d9bd2cecb78f

            SHA1

            5cb05f0ca90e0f95f98dbd7342dc1615c32cb6dc

            SHA256

            54aaeefe545a73032ca84145809d1e3f7d89723b1edbee2e8d35d73626c10e77

            SHA512

            438c3b231229eae797a74dde45e033be34158add35917488c12dd741776b2df181e5cf66b7238ee93abbf9560d5cb394b0d8369472b85336307c2ae2307b4d0d

          • memory/3572-2-0x0000000002C80000-0x0000000002C93000-memory.dmp
            Filesize

            76KB

          • memory/3572-4-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/3572-1-0x0000000002D00000-0x0000000002E00000-memory.dmp
            Filesize

            1024KB

          • memory/3572-14-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/4092-13-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/4092-10-0x0000000003400000-0x0000000003413000-memory.dmp
            Filesize

            76KB

          • memory/4092-8-0x0000000002DA0000-0x0000000002EA0000-memory.dmp
            Filesize

            1024KB

          • memory/4092-15-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/4184-33-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-37-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-17-0x0000000001090000-0x00000000010A5000-memory.dmp
            Filesize

            84KB

          • memory/4184-18-0x0000000001090000-0x00000000010A5000-memory.dmp
            Filesize

            84KB

          • memory/4184-20-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4184-23-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/4184-24-0x0000000002F50000-0x0000000002F56000-memory.dmp
            Filesize

            24KB

          • memory/4184-27-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-30-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-31-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-32-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-9-0x0000000001090000-0x00000000010A5000-memory.dmp
            Filesize

            84KB

          • memory/4184-34-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-35-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-36-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-16-0x0000000001090000-0x00000000010A5000-memory.dmp
            Filesize

            84KB

          • memory/4184-38-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-39-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-40-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-42-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-43-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-44-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-41-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-45-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-46-0x0000000002F60000-0x0000000002F70000-memory.dmp
            Filesize

            64KB

          • memory/4184-47-0x00000000031F0000-0x00000000031F5000-memory.dmp
            Filesize

            20KB

          • memory/4184-50-0x00000000031F0000-0x00000000031F5000-memory.dmp
            Filesize

            20KB

          • memory/4184-51-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/4184-54-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/4184-55-0x0000000008190000-0x0000000008197000-memory.dmp
            Filesize

            28KB

          • memory/4184-59-0x0000000001090000-0x00000000010A5000-memory.dmp
            Filesize

            84KB