TrojanDropper:Win32/Randrew.B!bit

Written by Robert Bailey

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

In this post you will discover about the meaning of TrojanDropper:Win32/Randrew.B!bit as well as its adverse effect on your computer. Such ransomware are a form of malware that is specified by on-line scams to require paying the ransom money by a sufferer.

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In the majority of the instances, TrojanDropper:Win32/Randrew.B!bit virus will certainly instruct its targets to start funds move for the objective of neutralizing the amendments that the Trojan infection has actually introduced to the sufferer’s gadget.

TrojanDropper:Win32/Randrew.B!bit Summary

These modifications can be as adheres to:

  • 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.
  • 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.
  • HTTP traffic contains suspicious features which may be indicative of malware related traffic;
  • Performs some HTTP requests;
  • 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.
  • Attempts to modify Explorer settings to prevent hidden files from being displayed;
  • Uses suspicious command line tools or Windows utilities;
  • Ciphering the documents located on the victim’s disk drive — so the target can no more utilize the information;
  • Preventing normal accessibility to the target’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.
Similar behavior
Related domains
ns.dotbit.me BScope.TrojanRansom.Blocker

TrojanDropper:Win32/Randrew.B!bit

The most typical networks whereby TrojanDropper:Win32/Randrew.B!bit Ransomware are injected are:

  • By means of phishing emails;
  • As a repercussion of individual ending up on a resource that hosts a malicious software application;

As quickly as the Trojan is successfully infused, it will certainly either cipher the information on the sufferer’s PC or prevent the tool from functioning in an appropriate manner – while also putting a ransom money note that states the demand for the targets to impact the settlement for the purpose of decrypting the records or recovering the file system back to the first condition. In many circumstances, the ransom money note will turn up when the customer restarts the PC after the system has already been damaged.

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

In different edges of the globe, TrojanDropper:Win32/Randrew.B!bit grows by leaps and bounds. However, the ransom notes and also techniques of extorting the ransom amount may differ depending upon certain local (regional) setups. The ransom money notes and also techniques of obtaining the ransom money quantity might vary depending on particular local (local) settings.

Ransomware injection

For instance:

    Faulty signals regarding unlicensed software.

    In specific areas, the Trojans commonly wrongfully report having discovered some unlicensed applications allowed on the victim’s gadget. The alert then requires the user to pay the ransom money.

    Faulty declarations concerning illegal web content.

    In nations where software program piracy is much less prominent, this approach is not as efficient for the cyber scams. Additionally, the TrojanDropper:Win32/Randrew.B!bit popup alert might wrongly claim to be deriving from a police organization and also will report having located youngster pornography or various other unlawful information on the gadget.

    TrojanDropper:Win32/Randrew.B!bit popup alert may wrongly claim to be obtaining from a legislation enforcement organization and also will certainly report having located child pornography or other illegal data on the device. The alert will similarly include a requirement for the individual to pay the ransom money.

Technical details

File Info:

crc32: FCB02E33
md5: fe3c05d0128fad45d1574339945f0d90
name: FE3C05D0128FAD45D1574339945F0D90.mlw
sha1: c75daa56bfaa62667761224db1a8fb8f07691547
sha256: 96b531da6c5bbc9bb6d9e5b6ff7b98a382782708a72c2ea4e948bdca35399051
sha512: e3f593072581360247c7801592853bf87eaf0f4515d1cd461bb700936af25109bba057c7806159af09de329e142de2daf8c4ab54df9de8044f56737cce94d0d3
ssdeep: 3072:2zyD/26F8tthP/aGGIB2rZj6TrM5yilT:+s2FtthPySwZuTO
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

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

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware1
K7AntiVirus P2PWorm ( 0055e3e51 )
Elastic malicious (high confidence)
DrWeb Trojan.Kasidet.8
Cynet Malicious (score: 100)
ALYac Gen:Variant.Zusy.300736
Cylance Unsafe
Zillya Trojan.Scar.Win32.102471
Sangfor Trojan.Win32.Save.a
CrowdStrike win/malicious_confidence_90% (D)
Alibaba TrojanDropper:Win32/Randrew.eca74b35
K7GW P2PWorm ( 0055e3e51 )
Cybereason malicious.0128fa
Cyren W32/Scar.Z.gen!Eldorado
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/Kasidet.AR
APEX Malicious
Avast Win32:Malware-gen
Kaspersky Trojan.Win32.Scar.owij
BitDefender Gen:Variant.Zusy.300736
NANO-Antivirus Virus.Win32.Gen.ccmw
MicroWorld-eScan Gen:Variant.Zusy.300736
Tencent Win32.Trojan.Scar.Eerc
Ad-Aware Gen:Variant.Zusy.300736
Sophos Mal/Generic-S
BitDefenderTheta AI:Packer.AA6225691E
VIPRE Trojan.Win32.Generic!BT
TrendMicro BKDR_ANDROM.SMQ
McAfee-GW-Edition BehavesLike.Win32.Generic.cc
FireEye Generic.mg.fe3c05d0128fad45
Emsisoft Gen:Variant.Zusy.300736 (B)
SentinelOne Static AI – Malicious PE
Jiangmin Trojan.Scar.hnh
Avira TR/Crypt.ZPACK.Gen
eGambit Generic.Worm
Kingsoft Win32.Troj.Scar.ow.(kcloud)
Microsoft TrojanDropper:Win32/Randrew.B!bit
AegisLab Trojan.Win32.Scar.4!c
GData Gen:Variant.Zusy.300736
AhnLab-V3 Trojan/Win32.Scar.C1550724
Acronis suspicious
McAfee RDN/Autorun.worm.gen.cz
MAX malware (ai score=100)
VBA32 BScope.TrojanRansom.Blocker
Panda Trj/GdSda.A
TrendMicro-HouseCall BKDR_ANDROM.SMQ
Rising Backdoor.Androm!8.113 (CLOUD)
Yandex Trojan.GenAsa!EMBvfAA7DVw
Ikarus Worm.Win32.Kasidet
MaxSecure Trojan.Malware.300983.susgen
Fortinet W32/GenKryptik.DVPS!tr
AVG Win32:Malware-gen
Paloalto generic.ml

How to remove TrojanDropper:Win32/Randrew.B!bit ransomware?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft1

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!bit 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!bit 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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