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
    17-04-2023 11:49

General

  • Target

    file.exe

  • Size

    212KB

  • MD5

    a28432f1ae1231aa338ca25bb76bca43

  • SHA1

    71f949d29951d3dc188e7553caaec487a114a88f

  • SHA256

    edb6dd6f22989b7d58e3cd4a941cb7bae8c12371f59d9623bad1c6201e75ad72

  • SHA512

    bafc90498131959718497031e8fd72ca6d458d82d28b1a8924984caf33ab1d09eb8d48c7f01019335b3ac7b348d71a562229cf4c8f193889eccee8b3fe820227

  • SSDEEP

    3072:19CDeqA5IRiybXzQy3HD5/062XLV/6bZXoVbFRdLa7222WV65tPcCcqI7iMOre:7ksIRld3D106s3VHdm0PcCcN7iMA

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\file.exe
    "C:\Users\Admin\AppData\Local\Temp\file.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:2456
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\fbzlgaps\
      2⤵
        PID:3480
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\ybuffopp.exe" C:\Windows\SysWOW64\fbzlgaps\
        2⤵
          PID:1656
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create fbzlgaps binPath= "C:\Windows\SysWOW64\fbzlgaps\ybuffopp.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4608
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description fbzlgaps "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:1804
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start fbzlgaps
          2⤵
          • Launches sc.exe
          PID:2028
        • 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:4868
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2456 -s 1044
          2⤵
          • Program crash
          PID:1484
      • C:\Windows\SysWOW64\fbzlgaps\ybuffopp.exe
        C:\Windows\SysWOW64\fbzlgaps\ybuffopp.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:4900
        • 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:2572
          • 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:2088
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4900 -s 528
          2⤵
          • Program crash
          PID:4140
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 2456 -ip 2456
        1⤵
          PID:228
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 492 -p 4900 -ip 4900
          1⤵
            PID:4056

          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\ybuffopp.exe
            Filesize

            14.0MB

            MD5

            6d09e3165c983be6ab7061612f910260

            SHA1

            7df1265bd5e89a6aa8a5ce720607ea14b293f805

            SHA256

            fbf38bdce26076adb961a37dbfda9ff4739dcf31fc088d68548ae1c2dead6ed4

            SHA512

            fc14c5095099a94bb2f02fa6cbb003e2c8301bae9d5b9a3d1c545ffde02d422c1cf4558bfe462b7c09f8713e7e5d2f7194113ca1441c8489ff84c3d97280e600

          • C:\Windows\SysWOW64\fbzlgaps\ybuffopp.exe
            Filesize

            14.0MB

            MD5

            6d09e3165c983be6ab7061612f910260

            SHA1

            7df1265bd5e89a6aa8a5ce720607ea14b293f805

            SHA256

            fbf38bdce26076adb961a37dbfda9ff4739dcf31fc088d68548ae1c2dead6ed4

            SHA512

            fc14c5095099a94bb2f02fa6cbb003e2c8301bae9d5b9a3d1c545ffde02d422c1cf4558bfe462b7c09f8713e7e5d2f7194113ca1441c8489ff84c3d97280e600

          • memory/2088-199-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-198-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-197-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-196-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-195-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-194-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-193-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2088-188-0x0000000000E50000-0x0000000000F41000-memory.dmp
            Filesize

            964KB

          • memory/2456-135-0x00000000021E0000-0x00000000021F3000-memory.dmp
            Filesize

            76KB

          • memory/2456-139-0x0000000000400000-0x00000000004A2000-memory.dmp
            Filesize

            648KB

          • memory/2572-167-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-172-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-159-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-160-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-161-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-162-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-163-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-164-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-165-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-166-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-153-0x0000000000FE0000-0x0000000000FE6000-memory.dmp
            Filesize

            24KB

          • memory/2572-168-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-169-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-170-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-171-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-156-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-173-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-174-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-175-0x0000000001920000-0x0000000001930000-memory.dmp
            Filesize

            64KB

          • memory/2572-176-0x00000000019F0000-0x00000000019F5000-memory.dmp
            Filesize

            20KB

          • memory/2572-179-0x00000000019F0000-0x00000000019F5000-memory.dmp
            Filesize

            20KB

          • memory/2572-180-0x0000000007140000-0x000000000754B000-memory.dmp
            Filesize

            4.0MB

          • memory/2572-183-0x0000000007140000-0x000000000754B000-memory.dmp
            Filesize

            4.0MB

          • memory/2572-184-0x00000000027D0000-0x00000000027D7000-memory.dmp
            Filesize

            28KB

          • memory/2572-152-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2572-149-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/2572-148-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/2572-146-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/2572-145-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/2572-140-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/2572-143-0x0000000000390000-0x00000000003A5000-memory.dmp
            Filesize

            84KB

          • memory/4900-144-0x0000000000400000-0x00000000004A2000-memory.dmp
            Filesize

            648KB