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PowerShell.DownLoader.1640

Aggiunto al database dei virus Dr.Web: 2024-11-26

La descrizione è stata aggiunta:

sha1:

  • 6d8716cddc3ca6c8558eb4f842d81638f00f01f8

Description

Malicious PowerShell script that installs stealthy cryptocurrency mining software. Initially obfuscated. Delivered to a compromised system via a compiled Visual Basic application masquerading as video conferencing software.

Operating routine

The script downloads one of 5 sets of malicious modules from hxxps://asobimo[.]link:

ZX-uninstaller2.rdp ZX-uninstaller.rdp ZE-uninstaller.rdp ZX.rdp ZE.rdp S32-uninstaller.rdp S64-uninstaller.rdp S32.rdp S64.rdp mc-uninstaller.rdp ec-uninstaller.rdp mc.rdp ec.rdp updater-uninstaller.rdp updatere-uninstaller.rdp updaterx-uninstaller.rdp updaterx-uninstaller2.rdp updater.rdp updaterx.rdp updater.rdp updaterx.rdp

Any of the module sets performs the following actions:

After downloading and executing the modules, the PowerShell script hxxps://asobimo[.]link/checkubr[.]txt is loaded, which saves and runs the following files:

  • $env:PUBLIC\Pictures\un.exe, located at hxxps://asobimo[.]link/asom-uninstaller.rdp The file is Trojan.Hosts.51840, sha1:99111907b50911f9b2853cd73b373d231ab92f79. It deletes a mining task with a common name GoogleUpdateTaskMachineQC.
  • $env:PUBLIC\Pictures\u.exe, located at hxxps://asobimo[.]link/xz-uninstaller.rdp The file is Trojan.Hosts.51839, sha1:385a72bede84c9c44b84b2f044ca77e440be0802. It alters the registry keys that are responsible for automatic Windows updates.
  • $env:PUBLIC\Pictures\m.exe, located at hxxps://asobimo[.]link/xz.rdp The file is Trojan.Siggen23.24088, sha1:0f05fbb257fc71ba649175b92fcd963ff23a2540. It installs the miner that downloads its settings from getcert[.]net/m.txt:
    
                --algo=rx/0  --url=xmr-asia1.nanopool.org:10343 --user="44SC1Wk3tmZeVr6LvcaVcsZbnYCT5hUVWe4ptAPE445NWhcYUvkShPuJiYkxi5yofgdTWqPUCCNdcBar18Kecbgs15gRzhk" --pass="" --cpu-max-threads-hint=50 --cinit-winring="terzfardvkrs.sys" --cinit-remote-config="https://getcert.net/m.txt" --cinit-stealth-targets="Taskmgr.exe,ProcessHacker.exe,perfmon.exe,procexp.exe,procexp64.exe" --cinit-version="3.4.0" --tls --cinit-idle-wait=5 --cinit-idle-cpu=80 --cinit-id="smyzfwfwcmmyixji"
                

Mitre matrix

Stage

Tactic

Execution

Command and Scripting Interpreter (T1059)

PowerShell (T1059.001)

Native API (T1106)

Shared modules (T1129)

Privilege Escalation

Process Injection (T1055)

DLL Side-Loading (T1574.002)

Defense Evasion

Obfuscated Files or Information (T1027)

Masquerading (T1036)

Process Injection (T1055)

Modify Registry (T1112)

Impair Defenses (T1562)

Disable or Modify Tools (T1562.001)

Hide Artifacts (T1564)

Hidden Files and Directories (T1564.001)

Hidden Window (T1564.003)

Discovery

Application Window Discovery (T1010)

Remote System Discovery (T1018)

Process Discovery (T1057)

System Information Discovery (T1082)

File and Directory Discovery (T1083)

Software Discovery (T1518)

Command and Control

Application Layer Protocol (T1071)

Non-Application Layer Protocol (T1095)

Encrypted Channel (T1573)

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
Download Dr.Web

Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

Find out more about Dr.Web for Android