Trojan.MSIL.Dropper.AO
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: | 4,739 |
| Threat Level: | 80 % (High) |
| Infected Computers: | 1,881 |
| First Seen: | February 10, 2022 |
| Last Seen: | July 14, 2026 |
| OS(es) Affected: | Windows |
The detection of Trojan.MSIL.Dropper.AO on your system indicates a potential security threat. This type of malware is designed to infiltrate your computer and cause harm, making it essential to understand its characteristics and take immediate action to remove it. In this report, we will provide you with an overview of Trojan.MSIL.Dropper.AO, its operating methods, symptoms of infection, and a step-by-step guide on how to remove it from your system.
Table of Contents
What Is Trojan.MSIL.Dropper.AO?
Trojan.MSIL.Dropper.AO is a type of Trojan horse malware that can be used to deliver various types of malicious payloads to a compromised system. The name "Trojan" refers to the fact that this malware disguises itself as a legitimate program, allowing it to evade detection and gain access to your system. The "MSIL" part of the name suggests that the malware is written in Microsoft Intermediate Language, which is a platform-agnostic language used by the .NET Framework. The "Dropper" component indicates that this malware is designed to drop or install additional malicious components on the infected system.
How Trojan.MSIL.Dropper.AO Operates
Trojan.MSIL.Dropper.AO operates by exploiting vulnerabilities in your system's security to gain access and establish a foothold. Once inside, it can download and install additional malware components, allowing it to perform a variety of malicious activities, such as data theft, spyware, ransomware, or other types of cyber attacks. This malware can also create backdoors, allowing remote access to your system, and can even recruit your computer into a botnet, a network of compromised machines used for malicious purposes.
Symptoms of Infection
The symptoms of a Trojan.MSIL.Dropper.AO infection can vary, but common signs include unusual system behavior, such as slow performance, crashes, or freezes. You may also notice unfamiliar programs or icons on your desktop, or suspicious network activity. Additionally, you may receive alerts from your security software or notice that your system is behaving erratically, such as displaying unusual error messages or pop-ups.
- Unexplained changes to your system settings or configuration
- New, unfamiliar programs or toolbars installed on your system
- Increased network activity, even when you're not using your computer
- System crashes or freezes, especially when running security software
How to Remove Trojan.MSIL.Dropper.AO
- Boot your system in Safe Mode with Networking to prevent the malware from loading and to allow you to download and install removal tools
- Perform a full scan of your system using a reputable anti-malware tool, such as SpyHunter, to detect and remove all malicious components
- Uninstall any suspicious programs or applications that you don't recognize or that were installed without your knowledge
- Reset your web browsers, including Chrome, Firefox, and Edge, to their default settings to remove any malicious extensions or add-ons
- Reboot your system and perform another full scan to ensure that all malicious components have been removed
Conclusion
Removing Trojan.MSIL.Dropper.AO from your system requires careful attention to detail and a thorough understanding of the malware's operating methods. By following the steps outlined in this report, you can help to ensure that your system is clean and free from infection. Remember to always use reputable security software and to keep your operating system and applications up to date to prevent future infections. Additionally, be cautious when downloading and installing software, and avoid opening suspicious emails or attachments to minimize the risk of malware infections.
Analysis Report
General information
| Family Name: | Trojan.MSIL.Dropper.AO |
|---|---|
| Signature status: | No Signature |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
d9aa303865ad9869c0cd2ae3a746b307
SHA1:
fdc8028e95f7c3f1172c6c280b4d7fb30a402c27
File Size:
4.52 MB, 4524032 bytes
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MD5:
dacc5620a54f0af5b10a278fe5f113f0
SHA1:
5b3f098c72768301951d7fb7294ed8f9b445a74a
SHA256:
F1529427ED7DD6604F72F6FCFCC357485401FFA1E9C0E8F9CFCC49F8F7448F7E
File Size:
4.50 MB, 4501504 bytes
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MD5:
3dbecef27eda9885b2504b60b1480bd8
SHA1:
a3ef3cfed377ebc2e1bf61df389d8649e7ecc7a4
SHA256:
58A8BB5BC8AC764110AE56D5C1A7157E28AE7BA8D9032678DDD8F3C19A2B953C
File Size:
3.90 MB, 3904000 bytes
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MD5:
8f40eaabc4aaa52d054128ec0d744539
SHA1:
b054f207a8152ff321512a50e2d30179c74e42a6
SHA256:
F80125E014BCA2BF978899D2CD9D2D1B3CE15E50113FAB6CEC74B78DB2D6DED0
File Size:
4.99 MB, 4990976 bytes
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MD5:
d633dfccde3ba8a86ec2bd550249a50e
SHA1:
9b55df1f5ce40ed4e21b86eced54d626a6803633
SHA256:
F53B218533E43EFB68A099556C2F689C0068C9EF0A2F11DA6D4F98F00DC2B69C
File Size:
4.71 MB, 4708864 bytes
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MD5:
c33bdb36aa76c2f3ef10ff6254e8097f
SHA1:
3e45a9b479cf93814973524cad5e75e41bf168bc
SHA256:
D259482FDD6963C848BC7A22771B4F4C120A12FB97F202DA1F9F019BD3793EAE
File Size:
3.94 MB, 3937280 bytes
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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 has TLS information
- File is .NET application
- 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)
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- File is not packed
- 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.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 | 2.13.3.25913 |
| Company Name |
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| File Description |
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| File Version |
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| Internal Name | Main.exe |
| Legal Copyright | Copyright © 2013 |
| Original Filename | Main.exe |
| Product Name |
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| Product Version |
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File Traits
- .NET
- dll
- SmartAssembly
- 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: | 6,781 |
|---|---|
| Potentially Malicious Blocks: | 640 |
| Whitelisted Blocks: | 2,629 |
| Unknown Blocks: | 3,512 |
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.- Banker.MA
- FakeAlert.X
- Injector.FHBB
- Kasperagent.A
- MSIL.Agent.YCDA
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- MSIL.Downloader.Agent.WA
- MSIL.Gamehack.LD
- MSIL.Krypt.ZADGB
- MSIL.Krypt.ZADY
- MSIL.Stealer.XE
- QQPass.AK
- Trojan.Downloader.Gen.HP
- Trojan.Downloader.Gen.MD
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 |
|---|---|
| \device\namedpipe\gmdasllogger | Generic Write,Read Attributes |
| c:\programdata\synaptics | Synchronize,Write Attributes |
| c:\programdata\synaptics\rcxabcb.tmp | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\programdata\synaptics\synaptics.exe | Generic Read,Write Data,Write Attributes,Write extended,Append data,Delete,LEFT 262144 |
| c:\programdata\synaptics\synaptics.exe | Synchronize,Write Attributes |
| c:\programdata\synaptics\synaptics.exe | Synchronize,Write Data |
| c:\users\user\appdata\local\microsoft\windows\usrclass.dat{dba6b5ef-640a-11ed-9bcb-f677369d361c}.txr.0.regtrans-ms | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\appdata\local\microsoft\windows\usrclass.dat{dba6b5ef-640a-11ed-9bcb-f677369d361c}.txr.1.regtrans-ms | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\appdata\local\microsoft\windows\usrclass.dat{dba6b5ef-640a-11ed-9bcb-f677369d361c}.txr.2.regtrans-ms | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\appdata\local\temp\jzrf5o6.ini | Generic Read,Write Data,Write Attributes,Write extended,Append data |
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| c:\users\user\appdata\roaming\winsl | Synchronize,Write Attributes |
| c:\users\user\appdata\roaming\winsl\l3\2\2026 | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\downloads\._cache_9b55df1f5ce40ed4e21b86eced54d626a6803633_0004708864 | Generic Read,Write Data,Write Attributes,Write extended,Append data |
| c:\users\user\downloads\._cache_9b55df1f5ce40ed4e21b86eced54d626a6803633_0004708864 | Synchronize,Write Attributes |
| c:\windows\appcompat\programs\amcache.hve | Read Data,Read Control,Write Data |
| c:\windows\appcompat\programs\amcache.hve | Write Attributes |
| c:\windows\appcompat\programs\amcache.hve.log1 | Read Data,Write Data |
| c:\windows\appcompat\programs\amcache.hve.log2 | Read Data,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\explorer::slowcontextmenuentries | `$�!�:i�� +00�� �Gs]XM���"�2� � FX D�':D��exA-� �LG=�A��J� �C� | RegNtPreCreateKey |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | -k � 8��8tX��B�8 �� �6 �v5� �Z xy �� T��� B� ������ � ���� �5����ee��Bx �< �!wz "Wc#�#��$kF$�� %"�%:� %�&� &�x(�(X�)�`*J*9*�"*�^*�h+�[,��/9� /��0P%1`1�1HO 1�D5�0 | RegNtPreCreateKey |
| HKLM\software\wow6432node\microsoft\windows\currentversion\run::synaptics pointing device driver | C:\ProgramData\Synaptics\Synaptics.exe | RegNtPreCreateKey |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::proxybypass | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::intranetname | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::uncasintranet | RegNtPreCreateKey | |
| HKCU\software\microsoft\windows\currentversion\internet settings\zonemap::autodetect | RegNtPreCreateKey | |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | .k � 8��8tX��B�8 �� �6 �v5� �Z xy �� T��� B� ������ � ���� �5����ee��Bx �< �!wz "Wc#�#��$kF$�� %"�%:� %�&� &�x(�(X�)�`*J*9*�"*�^*�h+�[,��/9� /��0P%1`1�1HO 1�D5�0 | RegNtPreCreateKey |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc3475 | ~� % xy * � /�� Y� d� kP~ � � �ރ �p ��^ �o � ��z ee, Vs} kP~ ��1 � �� 7 � �� ﺃ e e�� ��1 �� f e�� h �n | RegNtPreCreateKey |
| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | /k 8��8tX��B�8 �� �6 �v5� �Z xy �� �� T��� B� ������ � ���� �5����ee��Bx �< �!wz "Wc#�#��$kF$�� %"�%:� %�&� &�x(�(X�)�`*J*9*�"*�^*�h+�[,��/9� /��0P%1`1�1HO 1�D | RegNtPreCreateKey |
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| HKLM\software\microsoft\windows nt\currentversion\notifications\data::418a073aa3bc1c75 | 0k 8��8tX��B�8 �� �6 �v5� �Z xy �� �� T��� B� ������ � ���� �5����ee��Bx �< �!wz "Wc#�#��$kF$�� %"�%:� %�&� &�x(�(X�)�`*J*9*�"*�^*�h+�[,��/9� /��0P%1`1�1HO 1�D | RegNtPreCreateKey |
| HKLM\system\software\microsoft\tip\aggregateresults::data | 隞̃甁耀꧌ | 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 |
|---|---|
| Process Shell Execute |
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| User Data Access |
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| Anti Debug |
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| Other Suspicious |
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| Encryption Used |
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| Process Manipulation Evasion |
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| Service Control |
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| Network Winsock2 |
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| Network Winhttp |
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| Network Wininet |
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| Network Winsock |
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Shell Command Execution
Shell Command Execution
This section lists Windows shell commands that are run by the samples in this family. Windows Shell commands are often leveraged by malware for nefarious purposes and can be used to elevate security privileges, download and launch other malware, exploit vulnerabilities, collect and exfiltrate data, and hide malicious activity.
C:\WINDOWS\system32\fondue.exe "C:\WINDOWS\system32\fondue.exe" /enable-feature:NetFx3 /caller-name:mscoreei.dll
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C:\Windows\Microsoft.NET\Framework\v2.0.50727\\dw20.exe dw20.exe -x -s 868
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C:\Windows\Microsoft.NET\Framework\v2.0.50727\\dw20.exe dw20.exe -x -s 816
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runas c:\users\user\downloads\._cache_9b55df1f5ce40ed4e21b86eced54d626a6803633_0004708864
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runas C:\ProgramData\Synaptics\Synaptics.exe InjUpdate
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C:\Windows\Microsoft.NET\Framework\v2.0.50727\\dw20.exe dw20.exe -x -s 820
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