Trojan.MSIL.Krypt.ACAO
Threat Scorecard
EnigmaSoft Threat Scorecard
EnigmaSoft Threat Scorecards are assessment reports for different malware threats which have been collected and analyzed by our research team. EnigmaSoft Threat Scorecards evaluate and rank threats using several metrics including real-world and potential risk factors, trends, frequency, prevalence, and persistence. EnigmaSoft Threat Scorecards are updated regularly based on our research data and metrics and are useful for a wide range of computer users, from end users seeking solutions to remove malware from their systems to security experts analyzing threats.
EnigmaSoft Threat Scorecards display a variety of useful information, including:
Popularity Rank: The ranking of a particular threat in EnigmaSoft’s Threat Database.
Severity Level: The determined severity level of an object, represented numerically, based on our risk modeling process and research, as explained in our Threat Assessment Criteria.
Infected Computers: The number of confirmed and suspected cases of a particular threat detected on infected computers as reported by SpyHunter.
See also Threat Assessment Criteria.
| Popularity Rank: | 22,375 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 5 |
| First Seen: | February 23, 2023 |
| Last Seen: | October 17, 2026 |
| OS(es) Affected: | Windows |
Trojan.MSIL.Krypt.ACAO is a Windows-based Trojan built on the Microsoft .NET framework that is designed to infiltrate systems quietly and carry out malicious instructions without the user's knowledge. With a danger level rated 8 out of 10, this threat has been active since early 2023 and continues to be detected on systems, making it a persistent concern for Windows users.
Table of Contents
What Trojan.MSIL.Krypt.ACAO Does
Once active on a system, Trojan.MSIL.Krypt.ACAO operates silently in the background, avoiding obvious signs that would alert the user to its presence. It is compiled as a 64-bit .NET executable and is not digitally signed, which means it lacks the verification that legitimate software publishers typically provide. The Trojan has been observed creating and modifying files within hidden application data folders on the user's profile, including configuration and temporary files, suggesting it establishes a persistent presence and may store settings or data related to its operation.
This Trojan uses encryption-related system functions, which can indicate that it is designed to protect its own code, communications, or stolen data from being easily analyzed. It also checks for the presence of debugging tools, a technique commonly used by malware to detect when it is being examined by security researchers and to evade analysis. Beyond this, Trojan.MSIL.Krypt.ACAO may be capable of granting attackers remote access to the infected machine, potentially allowing them to delete files, install additional malicious programs, or manipulate the system in other harmful ways.
How It Usually Gets Onto Computers
Like many Trojans in its family, Trojan.MSIL.Krypt.ACAO typically spreads through deceptive means rather than exploiting a single specific vulnerability. Common infection methods include downloading software from untrustworthy or malicious websites, opening email attachments from unknown or unverified senders, and disguised files that may appear as executables, images, or other common formats to trick users into opening them. It can also take advantage of outdated software or unpatched security flaws on a system to install itself without obvious user interaction.
Risks for the User
Infections involving this type of Trojan carry serious risks. Because it can run silently and potentially provide attackers with control over the infected machine, users may face data theft, unauthorized file deletion, installation of additional malware, or complete compromise of system security. Personal information, login credentials, and other sensitive data stored or typed on the infected machine could be exposed to cybercriminals.
Signs of Infection
Because Trojans in this family are designed to operate covertly, visible symptoms are often minimal or absent. However, users might notice unusual system slowdowns, unexpected files appearing in application data folders, unfamiliar processes running in the background, or unexplained changes to system settings. Suspicious network activity, even when the system is otherwise idle, can also be a warning sign.
How to Stay Protected
To reduce the risk of infection, avoid downloading software from unofficial or questionable websites, and never open email attachments from unknown or unexpected senders. Keep the Windows operating system and all installed applications updated with the latest security patches to close known vulnerabilities. Exercise caution with any file that arrives unexpectedly, even if it appears to be a common format like an image or document, as disguised malicious files are a common infection tactic. Regularly backing up important data and using reputable, up-to-date security software can also help detect and remove threats like this one before they cause serious harm.
Analysis Report
General information
| Family Name: | Trojan.MSIL.Krypt.ACAO |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
a07e8390d2164892db9a5639d0557c38
SHA1:
a60a0101f81e2063e6d44ab05f7fd713b4b13e2a
SHA256:
37B8700DA35755233CEFC6C4C607AF0B06472CA12B4E6B5ED42A00200A2E18A2
File Size:
922.62 KB, 922624 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have exports table
- File doesn't have relocations information
- File doesn't have security information
- File is .NET application
- File is 64-bit executable
- File is either console or GUI application
- File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
- File is not packed
- IMAGE_FILE_DLL is not set inside PE header (Executable)
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- IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)
File Icons
File Icons
This section displays icon resources found within family samples. Malware often replicates icons commonly associated with legitimate software to mislead users into believing the malware is safe.
Windows PE Version Information
Windows PE Version Information
This section displays values and attributes that have been set in the Windows file version information data structure for samples within this family. To mislead users, malware actors often add fake version information mimicking legitimate software.| Name | Value |
|---|---|
| Assembly Version | 2.0.3.0 |
| File Description | PT |
| File Version | 2.0.3.0 |
| Internal Name | PT.exe |
| Legal Copyright | Copyright © 2025 |
| Original Filename | PT.exe |
| Product Name | PT |
| Product Version | 2.0.3.0 |
File Traits
- .NET
- HighEntropy
- x64
Block Information
Block Information
During analysis, EnigmaSoft breaks file samples into logical blocks for classification and comparison with other samples. Blocks can be used to generate malware detection rules and to group file samples into families based on shared source code, functionality and other distinguishing attributes and characteristics. This section lists a summary of this block data, as well as its classification by EnigmaSoft. A visual representation of the block data is also displayed, where available.| Total Blocks: | 666 |
|---|---|
| Potentially Malicious Blocks: | 17 |
| Whitelisted Blocks: | 277 |
| Unknown Blocks: | 372 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
Files Modified
Files Modified
This section lists files that were created, modified, moved and/or deleted by samples in this family. File system activity can provide valuable insight into how malware functions on the operating system.| File | Attributes |
|---|---|
| c:\users\user\appdata\local\loginapp\a60a0101f81e2063e6d44ab05_url_ozjmkllw3upp10tpnjmsewmiqq1bktfa\2.0.3.0\4u3f3rfx.newcfg | Generic Write,Read Attributes |
| c:\users\user\appdata\local\loginapp\a60a0101f81e2063e6d44ab05_url_ozjmkllw3upp10tpnjmsewmiqq1bktfa\2.0.3.0\4u3f3rfx.tmp | Generic Write,Read Attributes |
| c:\users\user\appdata\local\loginapp\a60a0101f81e2063e6d44ab05_url_ozjmkllw3upp10tpnjmsewmiqq1bktfa\2.0.3.0\user.config | Synchronize,Write Data |
Registry Modifications
Registry Modifications
This section lists registry keys and values that were created, modified and/or deleted by samples in this family. Windows Registry activity can provide valuable insight into malware functionality. Additionally, malware often creates registry values to allow itself to automatically start and indefinitely persist after an initial infection has compromised the system.| Key::Value | Data | API Name |
|---|---|---|
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::proxybypass | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::intranetname | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::uncasintranet | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::autodetect | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::proxybypass | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::intranetname | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::uncasintranet | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::autodetect | RegNtPreCreateKey |
Windows API Usage
Windows API Usage
This section lists Windows API calls that are used by the samples in this family. Windows API usage analysis is a valuable tool that can help identify malicious activity, such as keylogging, security privilege escalation, data encryption, data exfiltration, interference with antivirus software, and network request manipulation.| Category | API |
|---|---|
| Syscall Use |
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| User Data Access |
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| Encryption Used |
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| Anti Debug |
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