TrojanDropper:Win32/Randrew.B!rfn

Written by Robert Bailey

What is TrojanDropper:Win32/Randrew.B!rfn infection?

In this short article you will discover concerning the interpretation of TrojanDropper:Win32/Randrew.B!rfn as well as its adverse influence on your computer system. Such ransomware are a type of malware that is clarified by on the internet scams to require paying the ransom by a victim.

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Most of the situations, TrojanDropper:Win32/Randrew.B!rfn ransomware will advise its targets to start funds move for the function of counteracting the amendments that the Trojan infection has actually introduced to the sufferer’s tool.

TrojanDropper:Win32/Randrew.B!rfn Summary

These adjustments can be as complies with:

  • Executable code extraction. Cybercriminals often use binary packers to hinder the malicious code from reverse-engineered by malware analysts. A packer is a tool that compresses, encrypts, and modifies a malicious file’s format. Sometimes packers can be used for legitimate ends, for example, to protect a program against cracking or copying.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • Expresses interest in specific running processes;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • Drops a binary and executes it. Trojan-Downloader installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional malware onto the infected computer.
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Uses Windows utilities for basic functionality;
  • Attempts to remove evidence of file being downloaded from the Internet;
  • Executed a process and injected code into it, probably while unpacking;
  • Deletes its original binary from disk;
  • Installs itself for autorun at Windows startup. There is simple tactic using the Windows startup folder located at:
    C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup. Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.

    The registry run keys perform the same action, and can be located in different locations:

    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • Spoofs its process name and/or associated pathname to appear as a legitimate process;
  • Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Creates a copy of itself;
  • Collects information to fingerprint the system. There are behavioral human characteristics that can be used to digitally identify a person to grant access to systems, devices, or data. Unlike passwords and verification codes, fingerprints are fundamental parts of user’s identities. Among the threats blocked on biometric data processing and storage systems is spyware, the malware used in phishing attacks (mostly spyware downloaders and droppers), ransomware, and Banking Trojans as posing the greatest danger.
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Attempts to modify Explorer settings to prevent hidden files from being displayed;
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the records situated on the sufferer’s hard drive — so the victim can no more make use of the data;
  • Preventing routine access to the sufferer’s workstation;

TrojanDropper:Win32/Randrew.B!rfn

The most common networks where TrojanDropper:Win32/Randrew.B!rfn Trojans are infused are:

  • By methods of phishing e-mails. Email phishing is a cyber attack that uses disguised email as a goal is to trick the recipient into believing that the message is something they want or need — a request from their bank, for instance, or a note from someone in their company — and to click a link for download a malware.
  • As a repercussion of customer winding up on a resource that holds a harmful software;

As quickly as the Trojan is efficiently injected, it will either cipher the information on the target’s PC or protect against the device from operating in a correct fashion – while likewise placing a ransom note that states the need for the sufferers to impact the repayment for the function of decrypting the papers or restoring the data system back to the initial condition. In most instances, the ransom money note will turn up when the client reboots the PC after the system has actually currently been harmed.

TrojanDropper:Win32/Randrew.B!rfn distribution networks.

In various edges of the world, TrojanDropper:Win32/Randrew.B!rfn expands by leaps and bounds. However, the ransom money notes and also tricks of extorting the ransom money quantity may differ depending upon specific neighborhood (local) settings. The ransom money notes as well as techniques of obtaining the ransom amount may vary depending on specific regional (regional) settings.

Ransomware injection

As an example:

    Faulty signals about unlicensed software.

    In specific areas, the Trojans frequently wrongfully report having found some unlicensed applications enabled on the victim’s gadget. The alert after that demands the customer to pay the ransom.

    Faulty statements concerning prohibited web content.

    In countries where software application piracy is much less preferred, this technique is not as reliable for the cyber frauds. Additionally, the TrojanDropper:Win32/Randrew.B!rfn popup alert might incorrectly claim to be stemming from a law enforcement institution and will certainly report having situated kid pornography or various other illegal information on the tool.

    TrojanDropper:Win32/Randrew.B!rfn popup alert might incorrectly assert to be obtaining from a legislation enforcement institution and will report having situated child pornography or various other unlawful information on the gadget. The alert will likewise include a need for the individual to pay the ransom.

Technical details

File Info:

crc32: 2BDCA60C
md5: cf64e098855cc0e095584381721373bf
name: CF64E098855CC0E095584381721373BF.mlw
sha1: 93aceffc95698909f2d92933b2a9adb6ed2c8892
sha256: 9134ca3c413e5d9856a15636fb1ab63a656dea70de6df55661185d8d2b6e6590
sha512: 9b2db2f5ddb77d55b079fedb18e4f455d767485b0850092a7bb39ac5092f167ec094d1e07c5a6a56e01b25943ee9083f30c603413404ab41ef7cba5512dcfb49
ssdeep: 3072:jN7AfrOlbysgKbh5L52+jtqzdw/UDKSvUHnUvT9V4+9DOyNiWubNa/ncoyOZ51:ufCl3j4+aw8DZWUvI+fAo/co
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

Assembly Version: 4.2.2.6
LegalCopyright: Copyright xa9Hyperionics Technology LLC. 1999 - 2014
InternalName: Xmlhttprequest Bonus
FileVersion: 4.2.2.6
CompanyName: Hyperionics Technology LLC
PrivateBuild: 4.2.2.6
LegalTrademarks: Copyright xa9Hyperionics Technology LLC. 1999 - 2014
Comments: F4 Cutting
ProductName: Xmlhttprequest Bonus
Languages: English
ProductVersion: 4.2.2.6
FileDescription: F4 Cutting
OriginalFilename: Xmlhttprequest Bonus
Translation: 0x0409 0x04b0

TrojanDropper:Win32/Randrew.B!rfn also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.TrojVDb.Trojan
Elastic malicious (high confidence)
DrWeb Trojan.Kasidet.8
MicroWorld-eScan Gen:Variant.Jaiko.4564
ALYac Gen:Variant.Jaiko.4564
Cylance Unsafe
Zillya Trojan.Blocker.Win32.38656
Sangfor Ransom.Win32.Blocker.8
CrowdStrike win/malicious_confidence_60% (D)
K7GW Trojan ( 004f258f1 )
K7AntiVirus Trojan ( 004f258f1 )
Symantec Trojan Horse
ESET-NOD32 Win32/Kasidet.AI
APEX Malicious
Avast Win32:Malware-gen
Cynet Malicious (score: 100)
Kaspersky Trojan-Ransom.Win32.Blocker.jxht
BitDefender Gen:Variant.Jaiko.4564
NANO-Antivirus Trojan.Win32.Blocker.elsilh
Ad-Aware Gen:Variant.Jaiko.4564
Sophos Mal/Generic-S
Comodo Malware@#bohx7g2zd361
BitDefenderTheta Gen:NN.ZexaF.34678.pu0@aqpXK!oi
VIPRE Trojan.Win32.Generic!BT
McAfee-GW-Edition BehavesLike.Win32.Generic.dc
FireEye Generic.mg.cf64e098855cc0e0
Emsisoft Gen:Variant.Jaiko.4564 (B)
SentinelOne Static AI – Malicious PE
Webroot Trojan.Dropper.Gen
Avira TR/Crypt.ZPACK.pzatm
eGambit Unsafe.AI_Score_88%
Kingsoft Win32.Troj.Undef.(kcloud)
Microsoft TrojanDropper:Win32/Randrew.B!rfn
Arcabit Trojan.Jaiko.D11D4
GData Gen:Variant.Jaiko.4564
TACHYON Ransom/W32.Blocker.260608.B
AhnLab-V3 Trojan/Win32.Fakon.C1792994
Acronis suspicious
McAfee Artemis!CF64E098855C
MAX malware (ai score=100)
VBA32 BScope.Trojan.Downloader
Malwarebytes MachineLearning/Anomalous.93%
Panda Trj/CI.A
Tencent Win32.Trojan.Inject.Auto
Yandex Trojan.Blocker!ixVzRoVnwfQ
Ikarus Trojan.SuspectCRC
Fortinet W32/Blocker.JXHT!tr
AVG Win32:Malware-gen
Paloalto generic.ml
Qihoo-360 Win32/Ransom.Blocker.HgIASQ4A

How to remove TrojanDropper:Win32/Randrew.B!rfn virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
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There is no better way to recognize, remove and prevent PC threats than to use an anti-malware software from GridinSoft2.

Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for TrojanDropper:Win32/Randrew.B!rfn files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

Click on “Clean Now”.

When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

GridinSoft Anti-Malware Scan Result

Are Your Protected?

GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:

Full version of GridinSoft

Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove TrojanDropper:Win32/Randrew.B!rfn you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/products/

About the author

Robert Bailey

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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