What is PWS:Win32/Zbot infection?

In this post you will discover about the meaning of PWS:Win32/Zbot as well as its negative influence on your computer. Such ransomware are a kind of malware that is elaborated by on the internet scams to require paying the ransom money by a target.

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In the majority of the situations, PWS:Win32/Zbot virus will instruct its sufferers to launch funds transfer for the purpose of neutralizing the modifications that the Trojan infection has presented to the sufferer’s tool.

PWS:Win32/Zbot Summary

These alterations 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 with CreateRemoteThread in a remote process;
  • 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.
  • Starts servers listening on, :0;
  • 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.
  • 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;
  • Code injection with CreateRemoteThread in a remote process;
  • 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
  • Creates Zeus (Banking Trojan) mutexes;
  • Attempts to modify browser security settings;
  • Harvests credentials from local FTP client softwares;
  • Creates a slightly modified 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.
  • Ciphering the files found on the victim’s disk drive — so the sufferer can no more utilize the data;
  • Preventing regular access to the victim’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.


One of the most regular networks whereby PWS:Win32/Zbot Trojans are infused are:

  • By means of phishing e-mails;
  • As an effect of user ending up on a source that hosts a malicious software program;

As quickly as the Trojan is successfully injected, it will either cipher the data on the target’s computer or protect against the tool from working in a correct fashion – while additionally putting a ransom money note that states the requirement for the sufferers to effect the settlement for the purpose of decrypting the papers or restoring the documents system back to the initial condition. In many instances, the ransom money note will show up when the client restarts the COMPUTER after the system has actually currently been harmed.

PWS:Win32/Zbot distribution channels.

In various edges of the world, PWS:Win32/Zbot expands by jumps as well as bounds. Nevertheless, the ransom notes as well as tricks of obtaining the ransom money quantity might differ depending upon certain regional (local) setups. The ransom notes as well as tricks of extorting the ransom quantity might differ depending on particular regional (regional) settings.

Ransomware injection

For instance:

    Faulty informs regarding unlicensed software program.

    In certain areas, the Trojans often wrongfully report having found some unlicensed applications enabled on the target’s gadget. The sharp then demands the user to pay the ransom.

    Faulty statements about unlawful web content.

    In countries where software program piracy is less prominent, this method is not as reliable for the cyber fraudulences. Additionally, the PWS:Win32/Zbot popup alert might incorrectly declare to be deriving from a police organization as well as will certainly report having situated kid porn or other illegal data on the gadget.

    PWS:Win32/Zbot popup alert may wrongly claim to be acquiring from a law enforcement establishment and also will report having situated kid porn or other prohibited information on the gadget. The alert will in a similar way have a requirement for the customer to pay the ransom money.

Technical details

File Info:

crc32: 1285C551
md5: 9babe52f985b2b4193113d5c260eb195
name: 9BABE52F985B2B4193113D5C260EB195.mlw
sha1: b4b4772d485d7d4192774aca3a9c594f82717adb
sha256: ca2ab2eb8249afceb6b9f42bac54fe8635fb5ccbf4e497c35ed700d9dae1c2d1
sha512: 61f41678334ea638dd3dc02d280739910d4b64cc31289c3f99bf41067bdfee1a9ab2114920b7b162862046b06d59d2bb6168557cc1a4463113a2ad00f526af8b
ssdeep: 3072:WhBFnGu6BYxbu75pZlgpXor85hfuHwhxqn9fI2uW+It:WhHGzK475pUpXiwgxExIt
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

0: [No Data]

PWS:Win32/Zbot also known as:

GridinSoft Trojan.Ransom.Gen
K7AntiVirus Password-Stealer ( 003f06421 )
DrWeb Trojan.PWS.Panda.655
MicroWorld-eScan Gen:Heur.Conjar.9
CMC Trojan-Ransom.Win32.PornoAsset!O
Cylance Unsafe
Zillya Trojan.PornoAsset.Win32.2436
Sangfor Malware
CrowdStrike win/malicious_confidence_100% (D)
Alibaba Trojan:Win32/Kryptik.4d729f69
K7GW Password-Stealer ( 003f06421 )
Cybereason malicious.f985b2
Cyren W32/Falab.F.gen!Eldorado
ESET-NOD32 a variant of Win32/Kryptik.AJSD
APEX Malicious
TotalDefense Win32/Zbot.FVN
Avast Win32:Crypt-NOE [Trj]
GData Gen:Heur.Conjar.9
Kaspersky HEUR:Trojan.Win32.Generic
BitDefender Gen:Heur.Conjar.9
NANO-Antivirus Trojan.Win32.PornoAsset.vrbda
ViRobot Trojan.Win32.A.PornoAsset.130560
SUPERAntiSpyware Trojan.Agent/Gen-Kryptik
Tencent Win32.Trojan.Generic.Hwmt
Ad-Aware Gen:Heur.Conjar.9
Sophos Mal/Katusha-J
Comodo TrojWare.Win32.Kryptik.NEGB@4ri728
F-Secure Trojan.TR/Crypt.XPACK.Gen
BitDefenderTheta Gen:NN.ZexaF.34098.huW@aiKSCQoi
VIPRE Lookslike.Win32.Sirefef.j (v)
Invincea heuristic
McAfee-GW-Edition PWS-Zbot.gen.bgx
Emsisoft Gen:Heur.Conjar.9 (B)
SentinelOne DFI – Malicious PE
F-Prot W32/Falab.F.gen!Eldorado
Endgame malicious (high confidence)
Webroot W32.Malware.Gen
Avira TR/Crypt.XPACK.Gen
eGambit Generic.Malware
Antiy-AVL Trojan[Ransom]/Win32.PornoAsset
Microsoft PWS:Win32/Zbot
Jiangmin Trojan/PornoAsset.bso
Arcabit Trojan.Conjar.9
AegisLab Trojan.Win32.Generic.lC4A
ZoneAlarm HEUR:Trojan.Win32.Generic
TACHYON Trojan/W32.PornoAsset.130560
AhnLab-V3 Trojan/Win32.Yakes.R34620
Acronis suspicious
McAfee PWS-Zbot.gen.bgx
MAX malware (ai score=100)
VBA32 BScope.Trojan.Downloader
Panda Trj/Genetic.gen
TrendMicro-HouseCall TSPY_ZBOT.SM3T
Rising Trojan.Generic!8.C3 (CLOUD)
Ikarus Virus.Win32.Vundo
Fortinet W32/Poxter.A!tr
AVG Win32:Crypt-NOE [Trj]
Qihoo-360 HEUR/Malware.QVM19.Gen

How to remove PWS:Win32/Zbot ransomware?

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 PWS:Win32/Zbot 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 PWS:Win32/Zbot 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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