Trojan.ShellcodeRunner.TN
Trojan.ShellcodeRunner.TN is a detection name used to identify a type of Trojan horse malware designed to load and execute shellcode on an infected computer. Shellcode is a small piece of machine code that attackers use to carry out malicious actions, and a "runner" of this kind acts as a delivery mechanism that activates that code once it reaches the system. Like most threats in the Trojans category, this detection does not announce itself openly; instead, it hides its real purpose behind seemingly harmless files or processes, making it a serious risk for everyday users who may not notice anything unusual until damage has already been done.
Table of Contents
What This Threat Does
Trojans classified as ShellcodeRunner variants are typically used as a loading stage rather than the final payload. Their main job is to execute malicious code in memory, which can then download or unpack additional malicious components onto the device. This technique is commonly used to avoid detection, since the shellcode may run directly in memory without leaving many traces on the hard drive. Once active, this type of Trojan can be used to install further malware, such as information stealers, ransomware, backdoors, or other unwanted programs, depending on what the attacker behind the campaign intends to achieve.
How It Usually Gets Onto Computers
Trojans in this category generally spread through deceptive methods rather than by exploiting a single specific vulnerability. Typical infection paths include malicious email attachments, fake software downloads, cracked or pirated applications, compromised websites, malicious ads, or bundled installers that silently add extra components during installation. Because Trojans do not self-replicate, they rely on tricking the user into opening or running the infected file, or on being dropped silently by another piece of malware already present on the system.
Risks for the User
Because this Trojan is often a delivery tool for other malicious code, the real danger lies in what it brings onto the device afterward. Potential risks include theft of personal or financial information, unauthorized remote access to the computer, installation of additional malware, degraded system performance, and exposure to further attacks such as data encryption or system corruption. Since shellcode can run with elevated privileges in some cases, the compromised machine may also be used as a foothold for broader network intrusion if it is part of a business or shared environment.
Signs of Infection
Trojans built around shellcode execution are usually designed to be stealthy, but some warning signs can still appear, such as:
- Unexplained slowdowns or spikes in CPU and memory usage
- Unknown processes running in the background
- Security tools being disabled or failing to update
- Unexpected network activity or data usage
- New or unfamiliar programs appearing without the user's action
How to Stay Protected
Users can reduce the risk of infection by avoiding downloads from untrusted or unofficial sources, not opening attachments or links from unknown or suspicious emails, keeping the operating system and installed software updated, and being cautious with free or pirated software bundles. Regularly backing up important files, reviewing installed programs and startup items periodically, and using reputable, up-to-date security software to scan the system can help detect and remove threats like Trojan.ShellcodeRunner.TN before they cause significant harm.
Analysis Report
General information
| Family Name: | Trojan.ShellcodeRunner.TN |
|---|---|
| Signature status: | Self Signed |
Known Samples
Known Samples
This section lists other file samples believed to be associated with this family.|
MD5:
27f4490f243eb9eebb36a6d391901c8d
SHA1:
c04d6bf9f2f21d4ff8784e731469eb6445b35897
SHA256:
49C94317B4995330F4ABE8B090AAF9671F08B819F6A8CB61272DB4C390173D4D
File Size:
2.76 MB, 2755360 bytes
|
Windows Portable Executable Attributes
- File doesn't have "Rich" header
- File has exports table
- File has TLS information
- File is 64-bit executable
- File is console application (IMAGE_SUBSYSTEM_WINDOWS_CUI)
- File is either console or GUI application
- File is Native application (NOT .NET application)
- 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)
Digital Signatures
Digital Signatures
This section lists digital signatures that are attached to samples within this family. When analyzing and verifying digital signatures, it is important to confirm that the signature’s root authority is a well-known and trustworthy entity and that the status of the signature is good. Malware is often signed with non-trustworthy “Self Signed” digital signatures (which can be easily created by a malware author with no verification). Malware may also be signed by legitimate signatures that have an invalid status, and by signatures from questionable root authorities with fake or misleading “Signer” names.| Signer | Root | Status |
|---|---|---|
| SK HYNIX NAND PRODUCT SOLUTIONS CORP. | DigiCert Trusted G4 Code Signing RSA4096 SHA384 2021 CA1 | Self Signed |
File Traits
- dll
- 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: | 9,295 |
|---|---|
| Potentially Malicious Blocks: | 15 |
| Whitelisted Blocks: | 7,851 |
| Unknown Blocks: | 1,429 |
Visual Map
? - Unknown Block
x - Potentially Malicious Block
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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