Analysis

  • max time kernel
    125s
  • max time network
    152s
  • platform
    windows7_x64
  • resource
    win7-20220414-en
  • submitted
    11-05-2022 02:37

General

  • Target

    e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd.exe

  • Size

    504KB

  • MD5

    df648c75bae0fb216d8ce2b93c84aee2

  • SHA1

    f8728cff892fbfd292e3f52a23854204066adea4

  • SHA256

    e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd

  • SHA512

    b813f0973194ed82b596e2b573a48864faf77e83ff1ed07d9ab38b5a879308f0e09335ea225c7fa9f64fab83b9c0878d5a9208e333a40012893f7d76c8b7c249

Malware Config

Extracted

Family

quasar

Version

2.1.0.0

Botnet

svhost

C2

myconect.ddns.net:6606

Mutex

VNM_MUTEX_ND6PULLW5ZVLwo1nwR

Attributes
  • encryption_key

    yaa63tXY4j55os5llHHd

  • install_name

    Client.exe

  • log_directory

    Logs

  • reconnect_delay

    3000

  • startup_key

    Venom Client Startup

  • subdirectory

    SubDir

Signatures

  • Contains code to disable Windows Defender 4 IoCs

    A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

  • Quasar Payload 4 IoCs
  • Quasar RAT

    Quasar is an open source Remote Access Tool.

  • VenomRAT

    VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.

  • suricata: ET MALWARE Common RAT Connectivity Check Observed

    suricata: ET MALWARE Common RAT Connectivity Check Observed

  • Executes dropped EXE 1 IoCs
  • Loads dropped DLL 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Drops file in Windows directory 1 IoCs
  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

  • Office loads VBA resources, possible macro or embedded object present
  • Modifies Internet Explorer settings 1 TTPs 31 IoCs
  • Modifies registry class 64 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious use of AdjustPrivilegeToken 2 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 12 IoCs

Processes

  • C:\Users\Admin\AppData\Local\Temp\e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd.exe
    "C:\Users\Admin\AppData\Local\Temp\e39ab5bca5cebce3ca9ed90beb1cc9ec94b373bc895d5b961a0138e87d4086fd.exe"
    1⤵
    • Loads dropped DLL
    • Suspicious use of WriteProcessMemory
    PID:1672
    • C:\Users\Admin\AppData\Roaming\$77-Venom.exe
      "C:\Users\Admin\AppData\Roaming\$77-Venom.exe"
      2⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1036
    • C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE
      "C:\Program Files (x86)\Microsoft Office\Office14\WINWORD.EXE" /n "C:\Users\Admin\AppData\Roaming\null (2).docx"
      2⤵
      • Drops file in Windows directory
      • Modifies Internet Explorer settings
      • Modifies registry class
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:1932
      • C:\Windows\splwow64.exe
        C:\Windows\splwow64.exe 12288
        3⤵
          PID:1412

    Network

    MITRE ATT&CK Enterprise v6

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Roaming\$77-Venom.exe

      Filesize

      534KB

      MD5

      84c1dc6b428904cc2a6746653849df0f

      SHA1

      5cce4078427481f4d7456b5a4f3930ae6e706fb4

      SHA256

      bc24e3c5408fea0b6f9aa0deb56a4636a8d0b9a6054ff1033efa6ccfe04ba44a

      SHA512

      3b7a7607c3409b5ded563f2e1fcc0fa489c4465ab764d14a647b474968a025a95fa8ceb549fc70482b7b1dd935f66a41ada7b4910059786aafc870c5847a9245

    • C:\Users\Admin\AppData\Roaming\$77-Venom.exe

      Filesize

      534KB

      MD5

      84c1dc6b428904cc2a6746653849df0f

      SHA1

      5cce4078427481f4d7456b5a4f3930ae6e706fb4

      SHA256

      bc24e3c5408fea0b6f9aa0deb56a4636a8d0b9a6054ff1033efa6ccfe04ba44a

      SHA512

      3b7a7607c3409b5ded563f2e1fcc0fa489c4465ab764d14a647b474968a025a95fa8ceb549fc70482b7b1dd935f66a41ada7b4910059786aafc870c5847a9245

    • C:\Users\Admin\AppData\Roaming\null (2).docx

      Filesize

      2KB

      MD5

      b73ace90e3fbada0e8baa0d47b2cbd6f

      SHA1

      2147bfa5d92cb0c3fd296e7c90befa08564240a6

      SHA256

      94f271283b679ee024724d1aee0f4ead90ce56fb67813b5e0cbc082091fbe364

      SHA512

      d1a9d73fca25a73782bd0170937225afdb402a354a7fb6ea308114e276aed7f77ef211c458dd03292d2e90cd1d61976340396540ac410d452bda363f6d2ee157

    • \Users\Admin\AppData\Roaming\$77-Venom.exe

      Filesize

      534KB

      MD5

      84c1dc6b428904cc2a6746653849df0f

      SHA1

      5cce4078427481f4d7456b5a4f3930ae6e706fb4

      SHA256

      bc24e3c5408fea0b6f9aa0deb56a4636a8d0b9a6054ff1033efa6ccfe04ba44a

      SHA512

      3b7a7607c3409b5ded563f2e1fcc0fa489c4465ab764d14a647b474968a025a95fa8ceb549fc70482b7b1dd935f66a41ada7b4910059786aafc870c5847a9245

    • memory/1036-57-0x0000000000000000-mapping.dmp

    • memory/1036-60-0x00000000011B0000-0x000000000123C000-memory.dmp

      Filesize

      560KB

    • memory/1412-70-0x000007FEFBED1000-0x000007FEFBED3000-memory.dmp

      Filesize

      8KB

    • memory/1412-69-0x0000000000000000-mapping.dmp

    • memory/1672-54-0x00000000763C1000-0x00000000763C3000-memory.dmp

      Filesize

      8KB

    • memory/1672-55-0x0000000074860000-0x0000000074E0B000-memory.dmp

      Filesize

      5.7MB

    • memory/1932-64-0x000000006BD51000-0x000000006BD53000-memory.dmp

      Filesize

      8KB

    • memory/1932-65-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB

    • memory/1932-67-0x000000006CD3D000-0x000000006CD48000-memory.dmp

      Filesize

      44KB

    • memory/1932-63-0x000000006E2D1000-0x000000006E2D4000-memory.dmp

      Filesize

      12KB

    • memory/1932-62-0x0000000000000000-mapping.dmp

    • memory/1932-71-0x000000005FFF0000-0x0000000060000000-memory.dmp

      Filesize

      64KB