Written by Robert Bailey

What is Win32/TrojanDownloader.VB.QEM infection?

In this short article you will discover regarding the interpretation of Win32/TrojanDownloader.VB.QEM and its unfavorable influence on your computer. Such ransomware are a kind of malware that is specified by on the internet frauds to demand paying the ransom by a target.

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Most of the situations, Win32/TrojanDownloader.VB.QEM ransomware will advise its targets to start funds move for the function of counteracting the changes that the Trojan infection has actually presented to the target’s gadget.

Win32/TrojanDownloader.VB.QEM Summary

These adjustments can be as follows:

  • 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.
  • A process attempted to delay the analysis task.;
  • At least one IP Address, Domain, or File Name was found in a crypto call;
  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • 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.
  • The executable is compressed using UPX;
  • Uses Windows utilities for basic functionality;
  • Executed a process and injected code into it, probably while unpacking;
  • Deletes its original binary from disk;
  • Tries to unhook or modify Windows functions monitored by Cuckoo;
  • 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
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Attempts to modify browser security settings;
  • Operates on local firewall’s policies and settings;
  • Creates a copy of itself;
  • Attempts to disable browser security warnings;
  • 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.
  • Ciphering the files situated on the target’s hard disk drive — so the sufferer can no more utilize the information;
  • Preventing normal access 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 Trojan-Ransom.Win32.Blocker.bwhk Trojan-Ransom.Win32.Blocker.bwhk Trojan-Ransom.Win32.Blocker.bwhk Trojan-Ransom.Win32.Blocker.bwhk Trojan-Ransom.Win32.Blocker.bwhk


One of the most regular channels through which Win32/TrojanDownloader.VB.QEM Trojans are infused are:

  • By means of phishing emails;
  • As an effect of user winding up on a source that hosts a destructive software program;

As quickly as the Trojan is effectively injected, it will either cipher the data on the sufferer’s PC or avoid the tool from operating in an appropriate fashion – while additionally placing a ransom money note that states the need for the sufferers to impact the payment for the function of decrypting the files or recovering the documents system back to the first problem. In many circumstances, the ransom note will come up when the client reboots the COMPUTER after the system has already been damaged.

Win32/TrojanDownloader.VB.QEM distribution networks.

In different edges of the globe, Win32/TrojanDownloader.VB.QEM grows by jumps and bounds. However, the ransom notes and also methods of obtaining the ransom money quantity might differ depending upon certain regional (regional) settings. The ransom notes as well as methods of obtaining the ransom quantity may vary depending on certain neighborhood (regional) setups.

Ransomware injection

For instance:

    Faulty informs about unlicensed software program.

    In specific areas, the Trojans commonly wrongfully report having discovered some unlicensed applications made it possible for on the target’s gadget. The sharp then requires the individual to pay the ransom.

    Faulty declarations regarding unlawful web content.

    In nations where software piracy is much less preferred, this approach is not as reliable for the cyber fraudulences. Conversely, the Win32/TrojanDownloader.VB.QEM popup alert might wrongly assert to be deriving from a police establishment and will report having situated child pornography or other illegal information on the gadget.

    Win32/TrojanDownloader.VB.QEM popup alert might falsely assert to be acquiring from a law enforcement organization as well as will report having situated kid pornography or various other prohibited data on the tool. The alert will likewise contain a demand for the individual to pay the ransom money.

Technical details

File Info:

crc32: 26B45BB7
md5: cc37ddab4208f3275e56d61320531e40
name: CC37DDAB4208F3275E56D61320531E40.mlw
sha1: a3c2c182f5638d87c8a157cbef35de19496d383b
sha256: 99c3d97b5d25b39b2cc783ed59194a24361590ea20b5983380214073a743665d
sha512: ee0ff3d2c4e82c77fe9f2cd574499ef454fbc67deb183f47e02a4d53e4cada09a6566dd739adbc0c8507221f791ad938fa0556a1e13caf7bd1d1dddf41c30e95
ssdeep: 1536:k8683OhkCu3YU58gz7+dCyAk6V0y92iTUI:g83se8gzCdCRVH9g
type: PE32 executable (GUI) Intel 80386, for MS Windows, UPX compressed

Version Info:

LegalCopyright: Copyright 2013 Capital Polish Roman
InternalName: Capital Polish Roman
FileVersion: 5,1,3,6729
CompanyName: Capital Polish Roman
ProductName: Capital Polish Roman
ProductVersion: 5,1,3,6729
Translation: 0x0000 0x04b0

Win32/TrojanDownloader.VB.QEM also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetect.malware2
K7AntiVirus Trojan-Downloader ( 0055e3da1 )
MicroWorld-eScan Gen:Trojan.Heur.ZGY.7
ALYac Gen:Trojan.Heur.ZGY.7
Cylance Unsafe
Zillya Trojan.Blocker.Win32.35586
Sangfor Trojan.Win32.Save.a
Alibaba TrojanDownloader:Win32/Blocker.aeac4e3c
K7GW Trojan-Downloader ( 0055e3da1 )
Cybereason malicious.b4208f
Symantec ML.Attribute.HighConfidence
ESET-NOD32 a variant of Win32/TrojanDownloader.VB.QEM
APEX Malicious
Avast FileRepMalware
Cynet Malicious (score: 99)
Kaspersky Trojan-Ransom.Win32.Blocker.bwhk
BitDefender Gen:Trojan.Heur.ZGY.7
NANO-Antivirus Trojan.Win32.Blocker.ezmwot
Tencent Win32.Trojan.Blocker.Szbj
Ad-Aware Gen:Trojan.Heur.ZGY.7
Comodo Malware@#1qktuf0fx5cue
BitDefenderTheta AI:Packer.CB444DC315
VIPRE Trojan.Win32.Generic!BT
TrendMicro TROJ_SPNR.14FD13
McAfee-GW-Edition BehavesLike.Win32.Greener.qc
Emsisoft Gen:Trojan.Heur.ZGY.7 (B)
SentinelOne Static AI – Suspicious PE
Jiangmin Trojan.Blocker.cob
Webroot W32.Rogue.Gen
Avira TR/Dropper.Gen
eGambit Generic.Dropper
Kingsoft Win32.Troj.Undef.(kcloud)
Microsoft Program:Win32/Wacapew.C!ml
GData Gen:Trojan.Heur.ZGY.7
AhnLab-V3 Trojan/Win32.Blocker.C1733074
McAfee Artemis!CC37DDAB4208
MAX malware (ai score=100)
VBA32 BScope.TrojanRansom.Blocker
Panda Trj/CI.A
TrendMicro-HouseCall TROJ_SPNR.14FD13
Rising Ransom.Blocker!8.12A (CLOUD)
Yandex Trojan.Blocker!eVRMX4+Etzc
Ikarus Trojan.Win32.Spy
Fortinet W32/VBKrypt.C!tr
AVG FileRepMalware

How to remove Win32/TrojanDownloader.VB.QEM 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 Win32/TrojanDownloader.VB.QEM 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:

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If the guide doesn’t help you to remove Win32/TrojanDownloader.VB.QEM you can always ask me in the comments for getting help.

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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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