Trojan:Win32/Krilog.A

What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey

What is Trojan:Win32/Krilog.A infection?

In this post you will locate regarding the definition of Trojan:Win32/Krilog.A and also its unfavorable influence on your computer. Such ransomware are a kind of malware that is elaborated by on the internet frauds to require paying the ransom money by a target.

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Most of the situations, Trojan:Win32/Krilog.A infection will certainly advise its sufferers to launch funds transfer for the objective of counteracting the modifications that the Trojan infection has introduced to the victim’s tool.

Trojan:Win32/Krilog.A 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 with CreateRemoteThread in a remote process;
  • Attempts to connect to a dead IP:Port (1 unique times);
  • 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.;
  • A process created a hidden window;
  • 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 suspend Cuckoo threads to prevent logging of malicious activity;
  • Deletes its original binary from disk;
  • Tries to unhook or modify Windows functions monitored by Cuckoo;
  • A system process is generating network traffic likely as a result of process injection;
  • Behavior consistent with a dropper attempting to download the next stage.;
  • 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 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.
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Creates a copy of itself;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the papers located on the sufferer’s hard drive — so the sufferer can no more utilize the information;
  • Preventing normal accessibility to the sufferer’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
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Trojan:Win32/Krilog.A

One of the most typical networks through which Trojan:Win32/Krilog.A Ransomware Trojans are infused are:

  • By methods of phishing emails;
  • As an effect of individual winding up on a source that organizes a destructive software;

As quickly as the Trojan is successfully infused, it will either cipher the information on the sufferer’s computer or prevent the gadget from operating in a proper way – while additionally positioning a ransom money note that mentions the need for the victims to impact the settlement for the function of decrypting the documents or bring back the file system back to the first condition. In most circumstances, the ransom note will certainly turn up when the client restarts the COMPUTER after the system has actually already been damaged.

Trojan:Win32/Krilog.A circulation networks.

In numerous edges of the world, Trojan:Win32/Krilog.A expands by jumps and also bounds. Nonetheless, the ransom money notes as well as methods of extorting the ransom money quantity might differ depending on specific local (regional) settings. The ransom notes and tricks of obtaining the ransom amount might differ depending on particular local (regional) setups.

Ransomware injection

As an example:

    Faulty informs concerning unlicensed software.

    In particular areas, the Trojans frequently wrongfully report having spotted some unlicensed applications enabled on the victim’s tool. The alert then requires the individual to pay the ransom money.

    Faulty declarations concerning prohibited web content.

    In nations where software application piracy is much less popular, this approach is not as effective for the cyber fraudulences. Additionally, the Trojan:Win32/Krilog.A popup alert might falsely declare to be stemming from a law enforcement organization as well as will certainly report having situated youngster porn or other unlawful data on the gadget.

    Trojan:Win32/Krilog.A popup alert may incorrectly declare to be obtaining from a legislation enforcement organization as well as will certainly report having located youngster porn or various other illegal information on the gadget. The alert will similarly have a demand for the customer to pay the ransom.

Technical details

File Info:

crc32: 118B2879
md5: f55aa854a0fac6384420b6665f250dcb
name: F55AA854A0FAC6384420B6665F250DCB.mlw
sha1: ff107d171591344f71c98a9cc731dcb8e1e97939
sha256: 4f5c65d4865320515de4505086552f11255f1e5eca3edf32519482cb7a65026c
sha512: 2860290c202d921908752bb211fc9012d7dc79d61767d8dda71a18e71c9dd4e141ef689b7ae97508a64f53ed0add2f9fc78b29820e6759b324216c6feaa6de14
ssdeep: 1536:CkYya83VszjTJgYRoeJBG2ZLsKuh1ES1NECAsottifTKrwKWIBvxn:CkQ83VOtWe20sdeS1N/nfOXWIBvxn
type: MS-DOS executable

Version Info:

LegalCopyright: Copyright xa9 2009 Emsi Software GmbH. All rights reserved.
CompanyName: PROMT
FileVersion: 6.5.5.2
FileDescription: Emsisoft Anti-Malware Upate Proxy
Translation: 0x0409 0x0000

Trojan:Win32/Krilog.A also known as:

GridinSoftTrojan.Ransom.Gen
Elasticmalicious (high confidence)
MicroWorld-eScanGen:Variant.Razy.666460
McAfeeGeneric.dx!F55AA854A0FA
CylanceUnsafe
VIPRETrojan.Win32.Generic!BT
AegisLabWorm.Win32.Cridex.o!c
SangforTrojan.Win32.Save.a
BitDefenderGen:Variant.Razy.666460
Cybereasonmalicious.4a0fac
SymantecML.Attribute.HighConfidence
AvastWin32:Dropper-LWB [Drp]
KasperskyTrojan.Win32.BurHon.cd
NANO-AntivirusTrojan.Win32.Necurs.coecko
RisingTrojan.Generic@ML.82 (RDML:lfSpVin53dG+oH8PNhSPjA)
Ad-AwareGen:Variant.Razy.666460
EmsisoftGen:Variant.Razy.666460 (B)
ComodoMalware@#8s7y7r8tzarq
F-SecureTrojan.TR/Crypt.ZPACK.Gen2
DrWebTrojan.Necurs.20
ZillyaWorm.Cridex.Win32.139
McAfee-GW-EditionBehavesLike.Win32.Ransomware.nh
FireEyeGeneric.mg.f55aa854a0fac638
SophosMal/Generic-S + Mal/Generic-L
SentinelOneStatic AI – Malicious PE
AviraTR/Crypt.ZPACK.Gen2
MAXmalware (ai score=86)
Antiy-AVLWorm/Win32.Cridex
KingsoftWin32.Malware.Generic.a.(kcloud)
MicrosoftTrojan:Win32/Krilog.A
ArcabitTrojan.Razy.DA2B5C
ZoneAlarmTrojan.Win32.BurHon.cd
GDataGen:Variant.Razy.666460
CynetMalicious (score: 100)
Acronissuspicious
BitDefenderThetaGen:NN.ZexaF.34590.gq0@aOM89Xci
ALYacGen:Variant.Razy.666460
VBA32Worm.Cridex
PandaTrj/OCJ.A
ESET-NOD32Win32/AutoRun.Spy.Banker.M
TencentWin32.Worm.Cridex.doxu
YandexWorm.Cridex!Nwt77ZJXU3A
IkarusWorm.Win32.Cridex
FortinetW32/Shiz.NCF!tr
WebrootTrojan.Cridex.Gen
AVGWin32:Dropper-LWB [Drp]
Paloaltogeneric.ml
CrowdStrikewin/malicious_confidence_100% (D)
Qihoo-360HEUR/Malware.QVM20.Gen

How to remove Trojan:Win32/Krilog.A 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 Trojan:Win32/Krilog.A 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 Trojan:Win32/Krilog.A 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/comparison

About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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