Written by Robert Bailey

What is Trojan:Win32/Dofoil.STA infection?

In this post you will certainly discover regarding the interpretation of Trojan:Win32/Dofoil.STA as well as its adverse effect on your computer. Such ransomware are a form of malware that is elaborated by on-line frauds to require paying the ransom money by a sufferer.

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Most of the situations, Trojan:Win32/Dofoil.STA infection will instruct its targets to start funds transfer for the function of neutralizing the modifications that the Trojan infection has actually introduced to the target’s gadget.

Trojan:Win32/Dofoil.STA Summary

These adjustments can be as adheres to:

  • 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.
  • Attempts to connect to a dead IP:Port (4 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.;
  • Performs some HTTP requests;
  • Unconventionial language used in binary resources: Arabic (Tunisia);
  • The binary likely contains encrypted or compressed data. In this case, encryption is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Attempts to repeatedly call a single API many times in order to delay analysis time. This significantly complicates the work of the virus analyzer. Typical malware tactics!
  • Attempts to identify installed AV products by installation directory;
  • Checks the CPU name from registry, possibly for anti-virtualization;
  • Attempts to modify proxy settings. This trick used for inject malware into connection between browser and server;
  • Anomalous binary characteristics. This is a way of hiding virus’ code from antiviruses and virus’ analysts.
  • Ciphering the documents found on the victim’s disk drive — so the target can no longer use the information;
  • Preventing routine access to the sufferer’s workstation;
Similar behavior
Related domains Ransom.Win32.Wacatac.oa Ransom.Win32.Wacatac.oa Ransom.Win32.Wacatac.oa Ransom.Win32.Wacatac.oa Ransom.Win32.Wacatac.oa


One of the most regular channels where Trojan:Win32/Dofoil.STA Ransomware Trojans are infused are:

  • By ways of phishing e-mails;
  • As an effect of user winding up on a source that hosts a destructive software program;

As quickly as the Trojan is successfully injected, it will either cipher the information on the victim’s computer or protect against the device from working in a proper way – while also placing a ransom note that states the need for the sufferers to effect the repayment for the function of decrypting the documents or restoring the data system back to the first problem. In most circumstances, the ransom note will certainly turn up when the client reboots the COMPUTER after the system has actually already been harmed.

Trojan:Win32/Dofoil.STA distribution networks.

In different edges of the world, Trojan:Win32/Dofoil.STA grows by leaps and bounds. Nevertheless, the ransom notes and also tricks of extorting the ransom money amount may vary relying on certain neighborhood (local) setups. The ransom notes as well as methods of obtaining the ransom money amount might differ depending on particular neighborhood (local) setups.

Ransomware injection

For example:

    Faulty informs about unlicensed software.

    In specific areas, the Trojans often wrongfully report having actually identified some unlicensed applications allowed on the target’s device. The alert after that requires the customer to pay the ransom.

    Faulty statements concerning unlawful material.

    In countries where software program piracy is much less popular, this method is not as reliable for the cyber scams. Conversely, the Trojan:Win32/Dofoil.STA popup alert may incorrectly declare to be originating from a law enforcement establishment as well as will certainly report having located youngster pornography or various other prohibited data on the gadget.

    Trojan:Win32/Dofoil.STA popup alert might incorrectly declare to be deriving from a law enforcement establishment and will certainly report having located child porn or various other prohibited data on the gadget. The alert will in a similar way consist of a requirement for the user to pay the ransom money.

Technical details

File Info:

crc32: AD85C913
md5: 71c391018799e159e37eabeaacb0b949
name: upload_file
sha1: 8f318b2335b60f989a50826fbf12068b20b47ac7
sha256: 970c48c21582ed3e4cd22dded1852da31a0b83bfe93c0d82c74445928d104e7f
sha512: ef1b9ce4c89e86e6641856c12671e0bae29bed364b0df1065d80c322f1a5ec9a473606a38289b83079395632e00581a69388b5f8665509da092cb8fe55330ff3
ssdeep: 12288:GX/T8B/OSQYIGWHTdszT8dfdKaG3/yqOenb:GvTk/v2hH5sQfdQKgnb
type: PE32 executable (GUI) Intel 80386, for MS Windows

Version Info:

InternalName: writeawts.ets
FileVers: 1.22.381
Copyright: Copyrighz (C) 2020, gubkab
TranslationUsa: 0x0421 0x0cd7

Trojan:Win32/Dofoil.STA also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan Trojan.GenericKD.35042987
ALYac Trojan.GenericKD.35042987
Cylance Unsafe
VIPRE Trojan.Win32.Generic!BT
AegisLab Trojan.Multi.Generic.4!c
Sangfor Malware
K7AntiVirus Trojan ( 005722711 )
BitDefender Trojan.GenericKD.35042987
K7GW Trojan ( 005722711 )
Cybereason malicious.335b60
TrendMicro TROJ_GEN.R057C0DK420
Cyren W32/Kryptik.CIT.gen!Eldorado
Symantec ML.Attribute.HighConfidence
APEX Malicious
ClamAV Win.Malware.Generic-9785903-0
Kaspersky HEUR:Exploit.Win32.Shellcode.gen
Alibaba Trojan:Win32/Dofoil.eefa929c
ViRobot Trojan.Win32.Z.Wacatac.684544.A
Avast Win32:TrojanX-gen [Trj]
Rising Trojan.Kryptik!1.CE5E (CLASSIC)
Ad-Aware Trojan.GenericKD.35042987
Sophos Mal/Generic-S
F-Secure Trojan.TR/AD.AHKInfoSteal.HI
Invincea Mal/Generic-S
McAfee-GW-Edition BehavesLike.Win32.SoftPulse.jc
Emsisoft Trojan.GenericKD.35042987 (B)
Ikarus Trojan.Win32.Glupteba
Avira TR/AD.AHKInfoSteal.HI
eGambit Unsafe.AI_Score_67%
MAX malware (ai score=80)
Microsoft Trojan:Win32/Dofoil.STA
Gridinsoft Ransom.Win32.Wacatac.oa
Arcabit Trojan.Generic.D216B6AB
ZoneAlarm HEUR:Exploit.Win32.Shellcode.gen
GData Trojan.GenericKD.35042987
Cynet Malicious (score: 100)
AhnLab-V3 Trojan/Win32.Glupteba.R354572
Acronis suspicious
McAfee GenericRXAA-AA!71C391018799
VBA32 Trojan.Azorult
Malwarebytes Trojan.MalPack.GS
ESET-NOD32 a variant of Win32/Kryptik.HHDK
TrendMicro-HouseCall TROJ_GEN.R057C0DK420
Tencent Win32.Exploit.Shellcode.Ahol
SentinelOne DFI – Malicious PE
MaxSecure Trojan.Malware.300983.susgen
Fortinet PossibleThreat.PALLAS.H
AVG Win32:TrojanX-gen [Trj]
Panda Trj/GdSda.A
CrowdStrike win/malicious_confidence_80% (W)
Qihoo-360 Generic/HEUR/QVM10.2.FC3B.Malware.Gen

How to remove Trojan:Win32/Dofoil.STA virus?

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

The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

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/Dofoil.STA 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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Full version of GridinSoft Anti-Malware

If the guide doesn’t help you to remove Trojan:Win32/Dofoil.STA you can always ask me in the comments for getting help.

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  1. GridinSoft Anti-Malware Review from HowToFix site:
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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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