Trojan.Bagle.A
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) |
| Infected Computers: | 147 |
| First Seen: | October 24, 2022 |
| Last Seen: | April 26, 2026 |
| OS(es) Affected: | Windows |
Trojan.Bagle.A is a Windows-based Trojan that belongs to one of the most notorious malware families to emerge in the mass-mailing worm era. Despite its age, variants and descendants of this threat continue to be detected, with activity observed from late 2022 through more recent dates, showing that older Trojan code can still resurface and pose a danger to unprotected systems. Like other threats in the Trojan category, Trojan.Bagle.A is designed to install itself quietly on a victim's computer without any visible warning, giving attackers a foothold they can exploit for a variety of malicious purposes.
Table of Contents
What Trojan.Bagle.A Does
Once active on a system, Trojan.Bagle.A behaves in a manner typical of backdoor-style Trojans. It is designed to grant remote attackers a degree of control over the infected machine, which can allow them to view or manipulate files, alter system settings, and monitor what the user is doing. Threats in this family are also known for interfering with security tools, attempting to disable or block antivirus programs so that they can continue operating undetected. In many cases, Trojans of this type are built to open a hidden communication channel to a remote server, which attackers can use to send further instructions or download additional malicious components onto the compromised computer. This means an initial infection can quickly escalate, with the Trojan pulling in more harmful payloads such as spyware, ransomware, or other malware.
How It Usually Gets onto Computers
As with most threats in this category, Trojan.Bagle.A typically spreads through deceptive email attachments. Users may receive a message that appears legitimate, urging them to open an attached file disguised as a document, image, or program. Common disguises for this type of threat include files with extensions such as .exe, .pif, or .avi, which conceal the malicious code within. Once the attachment is opened, the Trojan installs itself silently in the background, often without any obvious sign that something has gone wrong. Infected files can also spread through compromised downloads, file-sharing networks, or bundled software, which is standard behavior for Trojans of this kind.
Risks for the User
The presence of Trojan.Bagle.A on a system can lead to serious consequences. Because it is capable of granting remote access, attackers may steal sensitive information such as passwords, banking details, and personal files. The Trojan may also be used to turn the infected computer into part of a larger network of compromised machines, which can be leveraged for spam distribution or further attacks. Given its danger level, users should treat any detection of this threat as a serious security incident requiring prompt action.
Signs of Infection
Infected computers may show unusual slowdowns, unexpected crashes, or unfamiliar processes running in the background. Security software may be unexpectedly disabled or unable to update. Users might also notice strange network activity, unfamiliar outgoing emails, or new files and programs they did not install.
How to Stay Protected
To reduce the risk of infection, avoid opening email attachments from unknown or unexpected senders, especially executable files. Keep your operating system and software updated, use reputable security tools, and perform regular system scans. Backing up important files regularly can also minimize damage if an infection does occur.
Analysis Report
General information
| Family Name: | Trojan.Bagle.A |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
33d5a7163ab2c7d8a9156e79655e30ff
SHA1:
78660c004e95399f84931a7870e970bf38a2da2f
SHA256:
203D9C0D7A97BE2F07888330EBE59B2DF74E1AB196636712DD0379F8EAC002E6
File Size:
24.39 KB, 24391 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 relocations information
- File doesn't have security information
- File is 32-bit executable
- File is either console or GUI application
- File is GUI application (IMAGE_SUBSYSTEM_WINDOWS_GUI)
- File is Native application (NOT .NET application)
- File is not packed
Show More
- IMAGE_FILE_DLL is not set inside PE header (Executable)
- 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.
File Traits
- 00 section
- HighEntropy
- No Version Info
- 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: | 3 |
| Whitelisted Blocks: | 0 |
| 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.- Bagle.A
