Analysis

  • max time kernel
    149s
  • max time network
    153s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    07/01/2023, 07:37

General

  • Target
    file.exe
  • Size 306KB
  • Sample230107-jfs41sda83
  • SHA256 acc4755331e6f2539bf54703d58ee3af6726632face463c9ee794548b8712e8a
  • 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 6 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:764
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\eygemskb\
      2⤵
        PID:1992
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\hsotkdpe.exe" C:\Windows\SysWOW64\eygemskb\
        2⤵
          PID:4300
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create eygemskb binPath= "C:\Windows\SysWOW64\eygemskb\hsotkdpe.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4872
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description eygemskb "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2844
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start eygemskb
          2⤵
          • Launches sc.exe
          PID:5096
        • 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:4360
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 764 -s 892
          2⤵
          • Program crash
          PID:1648
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 764 -s 668
          2⤵
          • Program crash
          PID:1716
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 764 -s 1036
          2⤵
          • Program crash
          PID:1372
      • C:\Windows\SysWOW64\eygemskb\hsotkdpe.exe
        C:\Windows\SysWOW64\eygemskb\hsotkdpe.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4340
        • 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:3368
          • 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:3360
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4340 -s 280
          2⤵
          • Program crash
          PID:364
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4340 -s 536
          2⤵
          • Program crash
          PID:212
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4340 -s 556
          2⤵
          • Program crash
          PID:1476
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 764 -ip 764
        1⤵
          PID:1924
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 764 -ip 764
          1⤵
            PID:1752
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -pss -s 524 -p 764 -ip 764
            1⤵
              PID:2912
            • C:\Windows\SysWOW64\WerFault.exe
              C:\Windows\SysWOW64\WerFault.exe -pss -s 540 -p 4340 -ip 4340
              1⤵
                PID:1468
              • C:\Windows\SysWOW64\WerFault.exe
                C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4340 -ip 4340
                1⤵
                  PID:228
                • C:\Windows\SysWOW64\WerFault.exe
                  C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 4340 -ip 4340
                  1⤵
                    PID:1540

                  Network

                        MITRE ATT&CK Enterprise v6

                        Replay Monitor

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                        Downloads

                        hsotkdpe.exe

                        • Path C:\Users\Admin\AppData\Local\Temp\hsotkdpe.exe
                        • Size 13.4MB
                        • SHA256 45dda72813a92f5b9d2ab7258a09c0685293dd9207ea9a7466f817001c2e4567
                        • MD5 SHA1 SHA512 SSDEEP

                        hsotkdpe.exe

                        • Path C:\Windows\SysWOW64\eygemskb\hsotkdpe.exe
                        • Size 13.4MB
                        • SHA256 45dda72813a92f5b9d2ab7258a09c0685293dd9207ea9a7466f817001c2e4567
                        • MD5 SHA1 SHA512 SSDEEP

                        memory/764-143-0x0000000000400000-0x0000000003010000-memory.dmp

                        memory/764-133-0x000000000327D000-0x0000000003292000-memory.dmp

                        memory/764-134-0x0000000004D40000-0x0000000004D53000-memory.dmp

                        memory/764-135-0x0000000000400000-0x0000000003010000-memory.dmp

                        memory/3360-176-0x0000000001200000-0x00000000012F1000-memory.dmp

                        memory/3360-171-0x0000000001200000-0x00000000012F1000-memory.dmp

                        memory/3368-152-0x0000000002400000-0x000000000260F000-memory.dmp

                        memory/3368-161-0x00000000009F0000-0x00000000009F5000-memory.dmp

                        memory/3368-145-0x00000000005B0000-0x00000000005C5000-memory.dmp

                        memory/3368-167-0x00000000029D0000-0x00000000029D7000-memory.dmp

                        memory/3368-149-0x00000000005B0000-0x00000000005C5000-memory.dmp

                        memory/3368-164-0x0000000007380000-0x000000000778B000-memory.dmp

                        memory/3368-151-0x00000000005B0000-0x00000000005C5000-memory.dmp

                        memory/3368-155-0x00000000009D0000-0x00000000009D6000-memory.dmp

                        memory/3368-158-0x00000000009E0000-0x00000000009F0000-memory.dmp

                        memory/4340-150-0x0000000000400000-0x0000000003010000-memory.dmp

                        memory/4340-148-0x0000000003169000-0x000000000317E000-memory.dmp