Analysis

  • max time kernel
    143s
  • max time network
    149s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20241007-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/11/2024, 15:57

General

  • Target
    ae594cd758beff9851a2637e2f26995dccc8fd74d7f1078bc34d5a49da2a14bb.exe
  • Size 291KB
  • Sample241122-teaamazlhr
  • SHA256 ae594cd758beff9851a2637e2f26995dccc8fd74d7f1078bc34d5a49da2a14bb
  • MD5 SHA1 SHA512 SSDEEP

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.

  • Tofsee family
  • Creates new service(s) 2 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).

  • Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

    Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

  • Program crash 2 IoCs
  • System Location Discovery: System Language Discovery 1 TTPs 9 IoCs

    Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

  • Modifies data under HKEY_USERS 6 IoCs
  • Suspicious use of WriteProcessMemory 23 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\ae594cd758beff9851a2637e2f26995dccc8fd74d7f1078bc34d5a49da2a14bb.exe
    "C:\Users\Admin\AppData\Local\Temp\ae594cd758beff9851a2637e2f26995dccc8fd74d7f1078bc34d5a49da2a14bb.exe"
    1⤵
    • Checks computer location settings
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:2468
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\qckxfrc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:2152
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\vhtyvbao.exe" C:\Windows\SysWOW64\qckxfrc\
      2⤵
      • System Location Discovery: System Language Discovery
      PID:3048
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" create qckxfrc binPath= "C:\Windows\SysWOW64\qckxfrc\vhtyvbao.exe /d\"C:\Users\Admin\AppData\Local\Temp\ae594cd758beff9851a2637e2f26995dccc8fd74d7f1078bc34d5a49da2a14bb.exe\"" type= own start= auto DisplayName= "wifi support"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:5096
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" description qckxfrc "wifi internet conection"
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3988
    • C:\Windows\SysWOW64\sc.exe
      "C:\Windows\System32\sc.exe" start qckxfrc
      2⤵
      • Launches sc.exe
      • System Location Discovery: System Language Discovery
      PID:3068
    • 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
      • Event Triggered Execution: Netsh Helper DLL
      • System Location Discovery: System Language Discovery
      PID:1132
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 2468 -s 1036
      2⤵
      • Program crash
      PID:440
  • C:\Windows\SysWOW64\qckxfrc\vhtyvbao.exe
    C:\Windows\SysWOW64\qckxfrc\vhtyvbao.exe /d"C:\Users\Admin\AppData\Local\Temp\ae594cd758beff9851a2637e2f26995dccc8fd74d7f1078bc34d5a49da2a14bb.exe"
    1⤵
    • Executes dropped EXE
    • Suspicious use of SetThreadContext
    • System Location Discovery: System Language Discovery
    • Suspicious use of WriteProcessMemory
    PID:4216
    • C:\Windows\SysWOW64\svchost.exe
      svchost.exe
      2⤵
      • Sets service image path in registry
      • Deletes itself
      • Drops file in System32 directory
      • System Location Discovery: System Language Discovery
      • Modifies data under HKEY_USERS
      PID:3008
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -u -p 4216 -s 528
      2⤵
      • Program crash
      PID:516
  • C:\Windows\SysWOW64\WerFault.exe
    C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2468 -ip 2468
    1⤵
      PID:3384
    • C:\Windows\SysWOW64\WerFault.exe
      C:\Windows\SysWOW64\WerFault.exe -pss -s 420 -p 4216 -ip 4216
      1⤵
        PID:1600

      Network

            MITRE ATT&CK Enterprise v15

            Replay Monitor

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            Downloads

            vhtyvbao.exe

            • Path C:\Users\Admin\AppData\Local\Temp\vhtyvbao.exe
            • Size 11.4MB
            • SHA256 5af588586ecd580ee4fd86bb0b82821ac97bb3d2486c280afda53a7f825c11ef
            • MD5 SHA1 SHA512 SSDEEP

            memory/2468-1-0x0000000002790000-0x0000000002890000-memory.dmp

            memory/2468-2-0x0000000002700000-0x0000000002713000-memory.dmp

            memory/2468-3-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/2468-9-0x0000000000400000-0x0000000000415000-memory.dmp

            memory/2468-8-0x0000000002700000-0x0000000002713000-memory.dmp

            memory/2468-7-0x0000000000400000-0x0000000002462000-memory.dmp

            memory/3008-41-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-37-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-14-0x00000000012A0000-0x00000000012B5000-memory.dmp

            memory/3008-18-0x0000000002E00000-0x000000000300F000-memory.dmp

            memory/3008-36-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-43-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-52-0x0000000008390000-0x0000000008397000-memory.dmp

            memory/3008-48-0x0000000007E40000-0x000000000824B000-memory.dmp

            memory/3008-47-0x00000000033F0000-0x00000000033F5000-memory.dmp

            memory/3008-44-0x00000000033F0000-0x00000000033F5000-memory.dmp

            memory/3008-42-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-11-0x00000000012A0000-0x00000000012B5000-memory.dmp

            memory/3008-40-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-39-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-38-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-13-0x00000000012A0000-0x00000000012B5000-memory.dmp

            memory/3008-51-0x0000000007E40000-0x000000000824B000-memory.dmp

            memory/3008-35-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-34-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-33-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-32-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-31-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-30-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-29-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-28-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-27-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-24-0x0000000003160000-0x0000000003170000-memory.dmp

            memory/3008-21-0x0000000003150000-0x0000000003156000-memory.dmp

            memory/3008-20-0x0000000002E00000-0x000000000300F000-memory.dmp

            memory/4216-15-0x0000000000400000-0x0000000002462000-memory.dmp