Analysis

  • max time kernel
    149s
  • max time network
    155s
  • 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 13:14

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:2088
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hvjiravx\
      2⤵
        PID:3192
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jzzwiuki.exe" C:\Windows\SysWOW64\hvjiravx\
        2⤵
          PID:4724
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hvjiravx binPath= "C:\Windows\SysWOW64\hvjiravx\jzzwiuki.exe /d\"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3452
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hvjiravx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hvjiravx
          2⤵
          • Launches sc.exe
          PID:4000
        • 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:3676
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2088 -s 1192
          2⤵
          • Program crash
          PID:3672
      • C:\Windows\SysWOW64\hvjiravx\jzzwiuki.exe
        C:\Windows\SysWOW64\hvjiravx\jzzwiuki.exe /d"C:\Users\Admin\AppData\Local\Temp\a7c2b8d081407da5d72f12eeef21c11674ff616c89be40f73f114c292c09e6de.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2004
        • 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:3464
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2004 -s 508
          2⤵
          • Program crash
          PID:2200
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 2088 -ip 2088
        1⤵
          PID:228
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 2004 -ip 2004
          1⤵
            PID:1780

          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\jzzwiuki.exe
            Filesize

            11.3MB

            MD5

            da33599ea6e941d60913e3956edd5430

            SHA1

            bbcb83e8d6470a9b431ca51279209cc67ea8eca9

            SHA256

            fe3f2977042a9d1982b52f4ead018aeef63879658157b01cf86b8d2db657cd19

            SHA512

            d840eb80d7ba331776b12ab938cc4c2f1c43a512bdbbb43900ab32541a7b74a9e3680eccfed36845fbe0bd8ee4208ad5560960de5ceb44d131884ba17b8a2855

          • memory/2004-11-0x0000000002E80000-0x0000000002E93000-memory.dmp
            Filesize

            76KB

          • memory/2004-10-0x0000000002C70000-0x0000000002D70000-memory.dmp
            Filesize

            1024KB

          • memory/2004-15-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/2088-14-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/2088-2-0x0000000002D80000-0x0000000002D93000-memory.dmp
            Filesize

            76KB

          • memory/2088-4-0x0000000000400000-0x0000000002B11000-memory.dmp
            Filesize

            39.1MB

          • memory/2088-1-0x0000000002DC0000-0x0000000002EC0000-memory.dmp
            Filesize

            1024KB

          • memory/3464-33-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-35-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-17-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/3464-18-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/3464-20-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/3464-21-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/3464-24-0x0000000003000000-0x000000000320F000-memory.dmp
            Filesize

            2.1MB

          • memory/3464-25-0x00000000025E0000-0x00000000025E6000-memory.dmp
            Filesize

            24KB

          • memory/3464-28-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-32-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-8-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/3464-34-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-31-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-37-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-36-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-16-0x0000000001200000-0x0000000001215000-memory.dmp
            Filesize

            84KB

          • memory/3464-38-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-39-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-41-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-40-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-42-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-43-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-44-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-45-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-46-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-47-0x00000000025F0000-0x0000000002600000-memory.dmp
            Filesize

            64KB

          • memory/3464-48-0x00000000035D0000-0x00000000035D5000-memory.dmp
            Filesize

            20KB

          • memory/3464-51-0x00000000035D0000-0x00000000035D5000-memory.dmp
            Filesize

            20KB

          • memory/3464-52-0x0000000008040000-0x000000000844B000-memory.dmp
            Filesize

            4.0MB

          • memory/3464-55-0x0000000008040000-0x000000000844B000-memory.dmp
            Filesize

            4.0MB

          • memory/3464-56-0x00000000035E0000-0x00000000035E7000-memory.dmp
            Filesize

            28KB