Trojan.MSIL.Rozena.CBB
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.
| Threat Level: | 80 % (High) |
| First Seen: | September 8, 2026 |
| Last Seen: | October 14, 2026 |
| OS(es) Affected: | Windows |
Trojan.MSIL.Rozena.CBB is a backdoor-type Trojan built on the Microsoft .NET framework that targets Windows computers. First detected in the wild in early September 2026 and still being observed into October 2026, this threat is rated highly dangerous because of its ability to grant remote attackers control over an infected machine. It is a 32-bit .NET application that is not digitally signed, which means it carries no verified publisher information, a common trait among threats designed to blend in or slip past casual scrutiny.
Table of Contents
What Trojan.MSIL.Rozena.CBB Does
Once active on a system, Trojan.MSIL.Rozena.CBB runs silently in the background without showing any visible windows or alerts to the user. Its primary purpose is to open a channel that lets remote attackers gain extensive, and potentially complete, control over the infected computer. Behind the scenes, the Trojan interacts directly with low-level Windows system functions to manage files, memory, and processes, which allows it to carry out a variety of malicious actions without the user noticing. Typical capabilities associated with this type of threat include covertly deleting or modifying files, installing additional malicious programs, harvesting sensitive data stored on the device, and relaying stolen information back to the attacker. Because it is not packed and disguises itself using a generic file name associated with legitimate database-related components, it can be harder for an untrained eye to spot among normal system files.
How It Usually Gets Onto Computers
Trojans in the Rozena family, including this variant, typically spread by exploiting unpatched software vulnerabilities and security weaknesses on a target system. Infection commonly occurs through downloads from compromised or malicious websites, as well as through email attachments sent from untrusted or spoofed senders. These attachments can be disguised using a range of file extensions, including executables, media files, and even image files, in an attempt to trick users into opening them. Once the file is executed, the Trojan installs itself stealthily, often without any obvious sign that anything has happened.
Risks for the User
The presence of Trojan.MSIL.Rozena.CBB on a system poses a serious risk because it can hand remote attackers the keys to the entire machine. This can lead to theft of personal, financial, or business data, unauthorized installation of further malware, disruption or destruction of files, and use of the infected computer as a launch point for additional attacks. Because the Trojan operates quietly and avoids drawing attention, victims may remain unaware of the compromise for an extended period, increasing the potential damage.
Signs of Infection
Because this Trojan is designed to run covertly, obvious symptoms may be minimal or absent. Users should watch for unexplained slowdowns, unusual network activity, unfamiliar processes consuming system resources, security tools being disabled unexpectedly, or new files and programs appearing without explanation. Unexpected crashes or changes in system behavior that cannot be otherwise explained may also indicate a hidden infection.
How to Stay Protected
Keeping the operating system and all installed software fully updated helps close the security gaps that threats like this often exploit. Users should avoid opening email attachments from unknown or unexpected senders, be cautious about downloading software from unofficial or unverified websites, and verify file extensions before executing anything. Regularly backing up important data, using a reputable and up-to-date security solution, and practicing general caution online all reduce the chances of falling victim to this and similar Trojan threats.
Analysis Report
General information
| Family Name: | Trojan.MSIL.Rozena.CBB |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
13866931d98ab0cdadae9f4ee7f53ef1
SHA1:
898b0a1fad9b139b72d455207f9c9405d361a2ca
SHA256:
3E04CB320F34465ECB6ADDBE358050D3DF779DF5BA11535A8A52B5EC91507163
File Size:
5.12 KB, 5120 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File doesn't have debug information
- File doesn't have exports table
- File doesn't have security information
- File is .NET application
- File is 32-bit executable
- File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
- File is either console or GUI application
- 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)
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 | 0.0.0.0 |
| File Version | 0.0.0.0 |
| Internal Name | SqlClr.dll |
| Original Filename | SqlClr.dll |
| Product Version | 0.0.0.0 |
File Traits
- .NET
- dll
- x86
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: | 3 |
|---|---|
| Potentially Malicious Blocks: | 2 |
| Whitelisted Blocks: | 1 |
| Unknown Blocks: | 0 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
Similar Families
Similar Families
This section lists other families that share similarities with this family, based on EnigmaSoft’s analysis. Many malware families are created from the same malware toolkits and use the same packing and encryption techniques but uniquely extend functionality. Similar families may also share source code, attributes, icons, subcomponents, compromised and/or invalid digital signatures, and network characteristics. Researchers leverage these similarities to rapidly and effectively triage file samples and extend malware detection rules.- MSIL.Rozena.CBB
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 |
|---|---|---|
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | �n # �v����Bx (�1`1�1HO @V� A��H[uN$b"hk`k�q{b��P� ��!���� � ��3�� ��� ������m� Ù� �V ����$�8წ���l� �&M �~ �=�SB1_ T�Vw���%�������� �AE��D��&��$���L A *�" C ��| | 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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