Trojan.Stealer.ACJ

The detection of Trojan.Stealer.ACJ on your system indicates a potential security threat that requires immediate attention. This type of malware is designed to compromise your computer's security and steal sensitive information, making it essential to understand its nature and take prompt action to remove it.

What Is Trojan.Stealer.ACJ?

Trojan.Stealer.ACJ is a type of Trojan horse malware that can infect your computer through various means, such as exploited vulnerabilities, phishing emails, or infected software downloads. Once inside, it can cause significant harm by stealing personal data, logging keystrokes, and potentially allowing unauthorized access to your system. The "Trojan" part of its name refers to its ability to disguise itself as legitimate software, making it difficult to detect without proper security tools.

How Trojan.Stealer.ACJ Operates

Upon infection, Trojan.Stealer.ACJ can operate in the background, hidden from the user's view. It may communicate with its command and control servers to receive updates or send stolen data. This malware can also create backdoors, allowing hackers to access your system remotely and perform malicious activities. Its primary goal is to gather sensitive information, such as login credentials, credit card numbers, or other personal data, which can be used for identity theft, financial fraud, or other malicious purposes.

Symptoms of Infection

Identifying a Trojan.Stealer.ACJ infection can be challenging, as it often does not display obvious symptoms. However, you may notice unusual system behavior, such as slow performance, frequent crashes, or unfamiliar programs running in the background. Additionally, you might receive unexpected pop-ups, experience unusual network activity, or find unfamiliar icons on your desktop. If you suspect that your system has been compromised, it is crucial to take immediate action to mitigate potential damage.

• Unexplained system crashes or freezes
• New, unfamiliar programs or icons
• Increased network activity without apparent cause
• Pop-ups or unexpected ads
• Slow system performance

How to Remove Trojan.Stealer.ACJ

1. Boot your computer in Safe Mode with Networking to prevent the malware from loading and to allow for internet access for updates and scanning.
2. Perform a full scan of your system using a reputable anti-malware tool, such as SpyHunter, to detect and remove all instances of the malware.
3. Uninstall any suspicious programs that you do not recognize or that were installed around the time of the suspected infection.
4. Reset your web browsers (Chrome, Firefox, Edge) to their default settings to remove any malicious extensions or settings changes made by the malware.
5. Reboot your computer and perform another full scan to ensure that all remnants of the malware have been removed.

Conclusion

Removing Trojan.Stealer.ACJ from your system requires careful and immediate action to prevent further damage. By following the steps outlined above and maintaining good security practices, such as keeping your operating system and software up to date, using strong antivirus software, and being cautious with emails and downloads, you can significantly reduce the risk of future infections. Remember, vigilance and proactive security measures are key to protecting your digital assets and personal information in today's evolving cybersecurity landscape.

Analysis Report

General information

Family Name:	Trojan.Stealer.ACJ
Signature status:	No Signature

Known Samples

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Known Samples

This section lists other file samples believed to be associated with this family.

MD5: 2b9d9f2fa62a0763b3853dc50b8227c8 SHA1: 2f24b6ec5f765e4c41a0b3f99c11a02061205cf3 SHA256: D7E0EA803AD2C7AC5ACF5B8B92A4741E92E2492C169318161FA28D4FFBCCE34D File Size: 776.70 KB, 776704 bytes

Windows Portable Executable Attributes

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Windows Portable Executable Attributes

This section lists file attributes found within family samples. These attributes are extracted from the files’ Windows PE (Portable Executable) specification and various system flags. Portable Executable Attributes give malware researchers insight into a file’s functionality, executable details, platform and runtime environment.

• File doesn't have "Rich" header
• File doesn't have exports table
• 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
• IMAGE_FILE_DLL is not set inside PE header (Executable)
• IMAGE_FILE_EXECUTABLE_IMAGE is set inside PE header (Executable Image)

File Icons

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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

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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
Company Name	Microsoft Corporation
File Description	Win32 Cabinet Self-Extractor
File Version	11.00.17763.1 (WinBuild.160101.0800)
Internal Name	Wextract
Legal Copyright	© Microsoft Corporation. All rights reserved.
Original Filename	WEXTRACT.EXE .MUI
Product Name	Internet Explorer
Product Version	11.00.17763.1

File Traits

• HighEntropy
• No Version Info
• x86

Files Modified

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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:\users\user\appdata\local\temp\ixp000.tmp\k6944499.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\k6944499.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete
c:\users\user\appdata\local\temp\ixp000.tmp\x8580166.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp000.tmp\x8580166.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\j4123810.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\j4123810.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp001.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete
c:\users\user\appdata\local\temp\ixp001.tmp\x3486125.exe	Generic Write,Read Attributes

Show More

c:\users\user\appdata\local\temp\ixp001.tmp\x3486125.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\g0308721.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\g0308721.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\i5501530.exe	Generic Write,Read Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\i5501530.exe	Synchronize,Write Attributes
c:\users\user\appdata\local\temp\ixp002.tmp\tmp4351$.tmp	Generic Write,Read Attributes,Delete

Registry Modifications

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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\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup0	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Sljphiab\AppData\Local\Temp\IXP000.TMP\"	RegNtPreCreateKey
HKLM\software\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup1	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Sljphiab\AppData\Local\Temp\IXP001.TMP\"	RegNtPreCreateKey
HKLM\software\wow6432node\microsoft\windows\currentversion\runonce::wextract_cleanup2	rundll32.exe C:\WINDOWS\system32\advpack.dll,DelNodeRunDLL32 "C:\Users\Sljphiab\AppData\Local\Temp\IXP002.TMP\"	RegNtPreCreateKey
HKLM\system\controlset001\services\bam\state\usersettings\s-1-5-21-3119368278-1123331430-659265220-1001::\device\harddiskvolume2\windows\system32\conhost.exe	鶳ǜ	RegNtPreCreateKey

Windows API Usage

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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 Manipulation Evasion	NtUnmapViewOfSection
Process Shell Execute	CreateProcess
Syscall Use	ntdll.dll!NtAccessCheck ntdll.dll!NtAlertThreadByThreadId ntdll.dll!NtAlpcSendWaitReceivePort ntdll.dll!NtApphelpCacheControl ntdll.dll!NtClearEvent ntdll.dll!NtClose ntdll.dll!NtConnectPort ntdll.dll!NtCreateEvent ntdll.dll!NtCreateFile ntdll.dll!NtCreateMutant Show More ntdll.dll!NtCreateSection ntdll.dll!NtCreateSemaphore ntdll.dll!NtDuplicateObject ntdll.dll!NtDuplicateToken ntdll.dll!NtEnumerateValueKey ntdll.dll!NtFreeVirtualMemory ntdll.dll!NtMapViewOfSection ntdll.dll!NtOpenFile ntdll.dll!NtOpenKey ntdll.dll!NtOpenKeyEx ntdll.dll!NtOpenProcessToken ntdll.dll!NtOpenProcessTokenEx ntdll.dll!NtOpenSection ntdll.dll!NtOpenSemaphore ntdll.dll!NtOpenThreadTokenEx ntdll.dll!NtProtectVirtualMemory ntdll.dll!NtQueryAttributesFile ntdll.dll!NtQueryInformationProcess ntdll.dll!NtQueryInformationThread ntdll.dll!NtQueryInformationToken ntdll.dll!NtQueryKey ntdll.dll!NtQueryPerformanceCounter ntdll.dll!NtQuerySecurityAttributesToken ntdll.dll!NtQueryValueKey ntdll.dll!NtQueryVirtualMemory ntdll.dll!NtQueryVolumeInformationFile ntdll.dll!NtQueryWnfStateData ntdll.dll!NtReleaseMutant ntdll.dll!NtReleaseSemaphore ntdll.dll!NtReleaseWorkerFactoryWorker ntdll.dll!NtRequestWaitReplyPort ntdll.dll!NtSetEvent ntdll.dll!NtSetInformationProcess ntdll.dll!NtSetInformationVirtualMemory ntdll.dll!NtSetInformationWorkerFactory ntdll.dll!NtSubscribeWnfStateChange ntdll.dll!NtTestAlert ntdll.dll!NtTraceControl ntdll.dll!NtUnmapViewOfSection ntdll.dll!NtUnmapViewOfSectionEx ntdll.dll!NtWaitForAlertByThreadId ntdll.dll!NtWaitForSingleObject ntdll.dll!NtWaitForWorkViaWorkerFactory ntdll.dll!NtWaitLowEventPair ntdll.dll!NtWorkerFactoryWorkerReady ntdll.dll!NtWriteFile UNKNOWN
Anti Debug	IsDebuggerPresent
User Data Access	GetUserObjectInformation
Process Terminate	TerminateProcess

Shell Command Execution

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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:\Users\Sljphiab\AppData\Local\Temp\IXP000.TMP\x8580166.exe

C:\Users\Sljphiab\AppData\Local\Temp\IXP001.TMP\x3486125.exe

C:\Users\Sljphiab\AppData\Local\Temp\IXP002.TMP\g0308721.exe