Analysis

  • max time kernel
    151s
  • max time network
    159s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230915-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230915-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12/10/2023, 17:13

General

  • Target

    file.exe

  • Size

    265KB

  • MD5

    d8e2d4ee9ea649e6c59ed61bf899400e

  • SHA1

    b9a5245c0001c8fea8da2e716120a5cc93b10e6a

  • SHA256

    c78fdf1284c80f1d2822e9f53f85c116e080871086bae22c632f9e6a3786e4a5

  • SHA512

    999f99378b3a277ca6bf54f4211862b519104aaf729de8d8dad692c1a9d48561b25ce5782d970c1bf10ce814ee7787ed5a116d019b3470b74a7b2110015f1485

  • SSDEEP

    3072:QBNZOh4l8XCkzBQhqJQVjBFgbZzxQqhlO6DMNWTsUS1n:4ih4l8XCk1R0XgbZznoYMUX

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.

  • 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
  • GoLang User-Agent 1 IoCs

    Uses default user-agent string defined by GoLang HTTP packages.

  • Modifies data under HKEY_USERS 7 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:4124
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hozwtmg\
      2⤵
        PID:4204
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ipobjjrv.exe" C:\Windows\SysWOW64\hozwtmg\
        2⤵
          PID:2764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hozwtmg binPath= "C:\Windows\SysWOW64\hozwtmg\ipobjjrv.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3220
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hozwtmg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3688
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hozwtmg
          2⤵
          • Launches sc.exe
          PID:3580
        • 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:2332
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4124 -s 664
          2⤵
          • Program crash
          PID:316
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 4124 -ip 4124
        1⤵
          PID:5072
        • C:\Windows\SysWOW64\hozwtmg\ipobjjrv.exe
          C:\Windows\SysWOW64\hozwtmg\ipobjjrv.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2072
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe
            2⤵
            • Sets service image path in registry
            • Drops file in System32 directory
            • Modifies data under HKEY_USERS
            PID:4644
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2072 -s 516
            2⤵
            • Program crash
            PID:2852
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 484 -p 2072 -ip 2072
          1⤵
            PID:3252

          Network

          MITRE ATT&CK Enterprise v15

          Replay Monitor

          Loading Replay Monitor...

          Downloads

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

            Filesize

            10.8MB

            MD5

            7b684912652365496676b9d7df3b3e14

            SHA1

            f648922d52ee7c1c820a5fa4a13a73707cfda5e5

            SHA256

            8f0ded3945e2453b1d9423106261e73a1b48d6134425c50d335d552555ad81df

            SHA512

            29c9b08bbe771acc4fb1f4a8b56f16f29dfc030d40dcd121fe10927be7b9684fb50d909656a4d5008c50a91d01ef72bb999efb3f32a40f67c65efa9bdbb2e221

          • C:\Windows\SysWOW64\hozwtmg\ipobjjrv.exe

            Filesize

            10.8MB

            MD5

            7b684912652365496676b9d7df3b3e14

            SHA1

            f648922d52ee7c1c820a5fa4a13a73707cfda5e5

            SHA256

            8f0ded3945e2453b1d9423106261e73a1b48d6134425c50d335d552555ad81df

            SHA512

            29c9b08bbe771acc4fb1f4a8b56f16f29dfc030d40dcd121fe10927be7b9684fb50d909656a4d5008c50a91d01ef72bb999efb3f32a40f67c65efa9bdbb2e221

          • memory/2072-17-0x0000000000400000-0x00000000007CC000-memory.dmp

            Filesize

            3.8MB

          • memory/2072-10-0x0000000000A80000-0x0000000000B80000-memory.dmp

            Filesize

            1024KB

          • memory/2072-11-0x0000000000400000-0x00000000007CC000-memory.dmp

            Filesize

            3.8MB

          • memory/4124-2-0x00000000007E0000-0x00000000007F3000-memory.dmp

            Filesize

            76KB

          • memory/4124-4-0x0000000000400000-0x00000000007CC000-memory.dmp

            Filesize

            3.8MB

          • memory/4124-7-0x0000000000400000-0x00000000007CC000-memory.dmp

            Filesize

            3.8MB

          • memory/4124-8-0x00000000007E0000-0x00000000007F3000-memory.dmp

            Filesize

            76KB

          • memory/4124-1-0x0000000000800000-0x0000000000900000-memory.dmp

            Filesize

            1024KB

          • memory/4644-34-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-38-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-18-0x0000000001200000-0x0000000001215000-memory.dmp

            Filesize

            84KB

          • memory/4644-20-0x0000000001200000-0x0000000001215000-memory.dmp

            Filesize

            84KB

          • memory/4644-21-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/4644-24-0x0000000002E00000-0x000000000300F000-memory.dmp

            Filesize

            2.1MB

          • memory/4644-25-0x00000000025A0000-0x00000000025A6000-memory.dmp

            Filesize

            24KB

          • memory/4644-28-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-32-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-31-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-12-0x0000000001200000-0x0000000001215000-memory.dmp

            Filesize

            84KB

          • memory/4644-35-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-33-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-36-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-39-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-16-0x0000000001200000-0x0000000001215000-memory.dmp

            Filesize

            84KB

          • memory/4644-41-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-46-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-45-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-51-0x00000000033D0000-0x00000000033D5000-memory.dmp

            Filesize

            20KB

          • memory/4644-48-0x00000000033D0000-0x00000000033D5000-memory.dmp

            Filesize

            20KB

          • memory/4644-52-0x0000000007E00000-0x000000000820B000-memory.dmp

            Filesize

            4.0MB

          • memory/4644-47-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-44-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-43-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-55-0x0000000007E00000-0x000000000820B000-memory.dmp

            Filesize

            4.0MB

          • memory/4644-42-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-56-0x00000000033E0000-0x00000000033E7000-memory.dmp

            Filesize

            28KB

          • memory/4644-40-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB

          • memory/4644-37-0x00000000025B0000-0x00000000025C0000-memory.dmp

            Filesize

            64KB