Analysis

  • max time kernel
    151s
  • max time network
    154s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20220414-en
  • submitted
    15-06-2022 08:07

General

  • Target

    20858175662445a0f5a075b0ef3a69ced74de48455176b5dbb3cade970d5749e.exe

  • Size

    249KB

  • MD5

    09f4524705371e2be3f4edf95f278cca

  • SHA1

    cb833780ac24314eafefc2be83be4fb073ae5b01

  • SHA256

    20858175662445a0f5a075b0ef3a69ced74de48455176b5dbb3cade970d5749e

  • SHA512

    b4c035de334f33ef52389246a155966c37b5fff2f67a83059ab8c555e899505f9fc9317b39b2af8ccd46cbe81010b884e00e23afd21c4871356578872d7aaf0e

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

Processes

  • C:\Users\Admin\AppData\Local\Temp\20858175662445a0f5a075b0ef3a69ced74de48455176b5dbb3cade970d5749e.exe
    "C:\Users\Admin\AppData\Local\Temp\20858175662445a0f5a075b0ef3a69ced74de48455176b5dbb3cade970d5749e.exe"
    1⤵
    • Checks computer location settings
    • Suspicious use of WriteProcessMemory
    PID:3656
    • C:\Windows\SysWOW64\cmd.exe
      "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dmxndqqz\
      2⤵
        PID:5008
      • C:\Windows\SysWOW64\cmd.exe
        "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\comupmjq.exe" C:\Windows\SysWOW64\dmxndqqz\
        2⤵
          PID:3032
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" create dmxndqqz binPath= "C:\Windows\SysWOW64\dmxndqqz\comupmjq.exe /d\"C:\Users\Admin\AppData\Local\Temp\20858175662445a0f5a075b0ef3a69ced74de48455176b5dbb3cade970d5749e.exe\"" type= own start= auto DisplayName= "wifi support"
          2⤵
          • Launches sc.exe
          PID:3000
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" description dmxndqqz "wifi internet conection"
          2⤵
          • Launches sc.exe
          PID:2352
        • C:\Windows\SysWOW64\sc.exe
          "C:\Windows\System32\sc.exe" start dmxndqqz
          2⤵
          • Launches sc.exe
          PID:2032
        • 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:4064
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -u -p 3656 -s 1256
          2⤵
          • Program crash
          PID:4700
      • C:\Windows\SysWOW64\WerFault.exe
        C:\Windows\SysWOW64\WerFault.exe -pss -s 448 -p 3656 -ip 3656
        1⤵
          PID:4636
        • C:\Windows\SysWOW64\dmxndqqz\comupmjq.exe
          C:\Windows\SysWOW64\dmxndqqz\comupmjq.exe /d"C:\Users\Admin\AppData\Local\Temp\20858175662445a0f5a075b0ef3a69ced74de48455176b5dbb3cade970d5749e.exe"
          1⤵
          • Executes dropped EXE
          • Suspicious use of SetThreadContext
          • Suspicious use of WriteProcessMemory
          PID:4656
          • 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:3376
            • 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:1824
          • C:\Windows\SysWOW64\WerFault.exe
            C:\Windows\SysWOW64\WerFault.exe -u -p 4656 -s 532
            2⤵
            • Program crash
            PID:1404
        • C:\Windows\SysWOW64\WerFault.exe
          C:\Windows\SysWOW64\WerFault.exe -pss -s 532 -p 4656 -ip 4656
          1⤵
            PID:1096

          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\comupmjq.exe
            Filesize

            10.3MB

            MD5

            cb98d74e51aa617b0b192964a068a70e

            SHA1

            e900fada0febef27f684c2c4a2525fc5bfb22974

            SHA256

            ccac17ddb7a94cf0ba2447a1aa160b8fc44d17b6f8eb5c7b82c8bf2e03d56477

            SHA512

            2fded1fc63b24b79c2d9a33f026d3a81f6ea09d1739b03debbc31597f132dbe19d6dd87e877297bb88fdae070382b4372536749c8fc32a94aa8b2a4b16acfaf4

          • C:\Windows\SysWOW64\dmxndqqz\comupmjq.exe
            Filesize

            10.3MB

            MD5

            cb98d74e51aa617b0b192964a068a70e

            SHA1

            e900fada0febef27f684c2c4a2525fc5bfb22974

            SHA256

            ccac17ddb7a94cf0ba2447a1aa160b8fc44d17b6f8eb5c7b82c8bf2e03d56477

            SHA512

            2fded1fc63b24b79c2d9a33f026d3a81f6ea09d1739b03debbc31597f132dbe19d6dd87e877297bb88fdae070382b4372536749c8fc32a94aa8b2a4b16acfaf4

          • memory/1824-175-0x0000000001090000-0x0000000001181000-memory.dmp
            Filesize

            964KB

          • memory/1824-170-0x0000000001090000-0x0000000001181000-memory.dmp
            Filesize

            964KB

          • memory/1824-169-0x0000000000000000-mapping.dmp
          • memory/2032-138-0x0000000000000000-mapping.dmp
          • memory/2352-137-0x0000000000000000-mapping.dmp
          • memory/3000-136-0x0000000000000000-mapping.dmp
          • memory/3032-134-0x0000000000000000-mapping.dmp
          • memory/3376-144-0x0000000000000000-mapping.dmp
          • memory/3376-160-0x0000000001DE0000-0x0000000001DE5000-memory.dmp
            Filesize

            20KB

          • memory/3376-166-0x0000000001DF0000-0x0000000001DF7000-memory.dmp
            Filesize

            28KB

          • memory/3376-163-0x0000000007980000-0x0000000007D8B000-memory.dmp
            Filesize

            4.0MB

          • memory/3376-157-0x0000000000DF0000-0x0000000000E00000-memory.dmp
            Filesize

            64KB

          • memory/3376-154-0x0000000000DE0000-0x0000000000DE6000-memory.dmp
            Filesize

            24KB

          • memory/3376-145-0x00000000007C0000-0x00000000007D5000-memory.dmp
            Filesize

            84KB

          • memory/3376-151-0x0000000002A00000-0x0000000002C0F000-memory.dmp
            Filesize

            2.1MB

          • memory/3376-149-0x00000000007C0000-0x00000000007D5000-memory.dmp
            Filesize

            84KB

          • memory/3376-150-0x00000000007C0000-0x00000000007D5000-memory.dmp
            Filesize

            84KB

          • memory/3656-130-0x000000000071D000-0x000000000072B000-memory.dmp
            Filesize

            56KB

          • memory/3656-141-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/3656-132-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/3656-131-0x00000000006D0000-0x00000000006E3000-memory.dmp
            Filesize

            76KB

          • memory/4064-139-0x0000000000000000-mapping.dmp
          • memory/4656-148-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/4656-143-0x0000000000400000-0x000000000065A000-memory.dmp
            Filesize

            2.4MB

          • memory/4656-142-0x000000000091A000-0x0000000000927000-memory.dmp
            Filesize

            52KB

          • memory/5008-133-0x0000000000000000-mapping.dmp