Sf:ShellCode-CU [Trj]

Written by Robert Bailey

What is Sf:ShellCode-CU [Trj] infection?

In this article you will certainly discover about the interpretation of Sf:ShellCode-CU [Trj] and its unfavorable influence on your computer. Such ransomware are a type of malware that is clarified by online frauds to demand paying the ransom money by a victim.

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When we talk about the intrusion of unfamiliar programs into your computer’s work, the proverb “Forewarned is forearmed” describes the situation as accurately as possible. Gridinsoft Anti-Malware is exactly the tool that is always useful to have in your armory: fast, efficient, up-to-date. It is appropriate to use it as an emergency help at the slightest suspicion of infection.
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Most of the situations, Sf:ShellCode-CU [Trj] ransomware will instruct its targets to initiate funds transfer for the purpose of counteracting the modifications that the Trojan infection has actually introduced to the target’s device.

Sf:ShellCode-CU [Trj] Summary

These adjustments can be as follows:

  • Executable code extraction. Cybercriminals often use binary packers to hinder the malicious code from reverse-engineered by malware analysts. A packer is a tool that compresses, encrypts, and modifies a malicious file’s format. Sometimes packers can be used for legitimate ends, for example, to protect a program against cracking or copying.
  • Injection (inter-process);
  • Injection (Process Hollowing);
  • Creates RWX memory. There is a security trick with memory regions that allows an attacker to fill a buffer with a shellcode and then execute it. Filling a buffer with shellcode isn’t a big deal, it’s just data. The problem arises when the attacker is able to control the instruction pointer (EIP), usually by corrupting a function’s stack frame using a stack-based buffer overflow, and then changing the flow of execution by assigning this pointer to the address of the shellcode.
  • Possible date expiration check, exits too soon after checking local time;
  • Reads data out of its own binary image. The trick that allows the malware to read data out of your computer’s memory.

    Everything you run, type, or click on your computer goes through the memory. This includes passwords, bank account numbers, emails, and other confidential information. With this vulnerability, there is the potential for a malicious program to read that data.

  • Drops a binary and executes it. Trojan-Downloader installs itself to the system and waits until an Internet connection becomes available to connect to a remote server or website in order to download additional malware onto the infected computer.
  • The executable is compressed using UPX;
  • A scripting utility was executed;
  • Uses Windows utilities for basic functionality;
  • Executed a process and injected code into it, probably while unpacking;
  • Installs itself for autorun at Windows startup.

    There is simple tactic using the Windows startup folder located at:
    C:\Users\[user-name]\AppData\Roaming\Microsoft\Windows\StartMenu\Programs\Startup Shortcut links (.lnk extension) placed in this folder will cause Windows to launch the application each time [user-name] logs into Windows.

    The registry run keys perform the same action, and can be located in different locations:

    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\RunOnce
    • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\RunOnce
  • Creates a hidden or system file. The malware adds the hidden attribute to every file and folder on your system, so it appears as if everything has been deleted from your hard drive.
  • Network activity detected but not expressed in API logs. Microsoft built an API solution right into its Windows operating system it reveals network activity for all apps and programs that ran on the computer in the past 30-days. This malware hides network activity.
  • Creates a copy of itself;
  • Creates a slightly modified copy of itself;
  • Ciphering the documents found on the sufferer’s hard disk — so the target can no more use the data;
  • Preventing normal access to the victim’s workstation. This is the typical behavior of a virus called locker. It blocks access to the computer until the victim pays the ransom.

Sf:ShellCode-CU [Trj]

One of the most regular networks whereby Sf:ShellCode-CU [Trj] are infused are:

  • By ways of phishing emails;
  • As an effect of customer ending up on a resource that organizes a malicious software;

As quickly as the Trojan is efficiently infused, it will certainly either cipher the information on the target’s PC or avoid the tool from working in a proper fashion – while likewise positioning a ransom note that mentions the demand for the targets to effect the repayment for the function of decrypting the files or bring back the file system back to the preliminary condition. In a lot of instances, the ransom note will certainly come up when the client reboots the PC after the system has actually currently been harmed.

Sf:ShellCode-CU [Trj] circulation channels.

In numerous edges of the world, Sf:ShellCode-CU [Trj] grows by jumps and also bounds. Nevertheless, the ransom notes and also tricks of obtaining the ransom money amount may differ relying on certain neighborhood (regional) settings. The ransom money notes and also methods of obtaining the ransom quantity might vary depending on certain local (regional) setups.

Ransomware injection

For instance:

    Faulty alerts concerning unlicensed software program.

    In specific locations, the Trojans usually wrongfully report having spotted some unlicensed applications enabled on the sufferer’s tool. The alert after that requires the customer to pay the ransom.

    Faulty declarations regarding illegal web content.

    In nations where software program piracy is much less prominent, this method is not as effective for the cyber fraudulences. Conversely, the Sf:ShellCode-CU [Trj] popup alert might wrongly assert to be stemming from a law enforcement organization and also will certainly report having located kid pornography or various other illegal data on the tool.

    Sf:ShellCode-CU [Trj] popup alert might falsely claim to be deriving from a legislation enforcement establishment and will certainly report having situated youngster porn or other unlawful information on the gadget. The alert will similarly have a requirement for the individual to pay the ransom.

Technical details

File Info:

crc32: 9318BFC5
md5: e100f2f7bc5631c99129b724aeb66e49
name: upload_file
sha1: 008c716eb86ed1d1db3a9a836ad51c184e224506
sha256: 4df49720e204da4031506ebfaa473c3656ac7f5ece0e87735cef1f865fe42bc4
sha512: 736c69950dff6797951aae53bb48890520bbbdcf8602d8d0ceadd4f5e064ff6db1ebbc9f3407cb11acf99619b53f39060785fe8dd2e5da70d99cffdbe6b9ce75
ssdeep: 24576:ATU7AAmZZcVKfIxTiEVc847flVC6faaQDbGV6eH81k6IbGD2JTu0GoZQDbGV6eHa:ATU7AAmw4gxeOw46fUbNecCCFbNec/
type: PE32 executable (GUI) Intel 80386 (stripped to external PDB), for MS Windows, UPX compressed

Version Info:

LegalCopyright: Copyright (C) 2000
InternalName: FlowerPower
FileVersion: 1, 0, 0, 1
CompanyName:
PrivateBuild:
LegalTrademarks:
Comments:
ProductName: FlowerPower
SpecialBuild:
ProductVersion: 1, 0, 0, 1
FileDescription: FlowerPower
OriginalFilename: FlowerPower.EXE
Translation: 0x0c09 0x04b0

Sf:ShellCode-CU [Trj] also known as:

GridinSoft Trojan.Ransom.Gen
Bkav W32.AIDetectVM.malware1
Elastic malicious (high confidence)
MicroWorld-eScan MemScan:Trojan.Agent.ECLV
FireEye Generic.mg.e100f2f7bc5631c9
CAT-QuickHeal Trojan.Mauvaise.SL1
McAfee Ransomware-GPB!E100F2F7BC56
Cylance Unsafe
Sangfor Malware
K7AntiVirus Trojan ( 00550e441 )
BitDefender MemScan:Trojan.Agent.ECLV
K7GW Trojan ( 00550e441 )
Cybereason malicious.eb86ed
Cyren W32/Injector.HCZU-8989
Symantec ML.Attribute.HighConfidence
APEX Malicious
Avast Sf:ShellCode-CU [Trj]
ClamAV Win.Malware.Ursu-6793772-0
Kaspersky HEUR:Trojan.Win32.Generic
NANO-Antivirus Trojan.Win32.Inject3.fqtflc
Rising Trojan.Kryptik!1.BA0B (CLASSIC)
Ad-Aware MemScan:Trojan.Agent.ECLV
Comodo TrojWare.Win32.Injector.AVPL@8d26g3
DrWeb Trojan.Inject3.16347
VIPRE Trojan.Win32.Generic!BT
Invincea ML/PE-A + Troj/Agent-BCEX
McAfee-GW-Edition BehavesLike.Win32.Ransomware.vc
Sophos Troj/Agent-BCEX
Ikarus VirTool.Win32.CeeInject.A
Jiangmin Trojan.Generic.dztud
MaxSecure Trojan.Malware.121218.susgen
Avira BDS/Poison.mon
MAX malware (ai score=85)
Microsoft Trojan:Win32/Skeeeyah!rfn
Arcabit Trojan.Agent.ECLV
ZoneAlarm HEUR:Trojan.Win32.Generic
GData MemScan:Trojan.Agent.ECLV
AhnLab-V3 Trojan/Win32.RL_Fuery.R280427
Acronis suspicious
BitDefenderTheta Gen:NN.ZexaF.34590.4s3@aGODL8ai
VBA32 SScope.Trojan.Hlux
Panda Trj/Genetic.gen
Zoner Trojan.Win32.89366
ESET-NOD32 Win32/Agent.TJS
Tencent Malware.Win32.Gencirc.10b076c3
Yandex Trojan.GenAsa!j1g/eRVGh3o
SentinelOne DFI – Malicious PE
eGambit Trojan.Generic
Fortinet W32/GenKryptik.DJNF!tr
Webroot W32.Malware.Gen
AVG Sf:ShellCode-CU [Trj]
CrowdStrike win/malicious_confidence_100% (D)
Qihoo-360 HEUR/QVM07.1.D427.Malware.Gen

How to remove Sf:ShellCode-CU [Trj] virus?

Unwanted application has ofter come with other viruses and spyware. This threats can steal account credentials, or crypt your documents for ransom.
Reasons why I would recommend GridinSoft1

The is an excellent way to deal with recognizing and removing threats – using Gridinsoft Anti-Malware. This program will scan your PC, find and neutralize all suspicious processes.2.

Download GridinSoft Anti-Malware.

You can download GridinSoft Anti-Malware by clicking the button below:

Run the setup file.

When setup file has finished downloading, double-click on the setup-antimalware-fix.exe file to install GridinSoft Anti-Malware on your system.

Run Setup.exe

An User Account Control asking you about to allow GridinSoft Anti-Malware to make changes to your device. So, you should click “Yes” to continue with the installation.

GridinSoft Anti-Malware Setup

Press “Install” button.

GridinSoft Anti-Malware Install

Once installed, Anti-Malware will automatically run.

GridinSoft Anti-Malware Splash-Screen

Wait for the Anti-Malware scan to complete.

GridinSoft Anti-Malware will automatically start scanning your system for Sf:ShellCode-CU [Trj] files and other malicious programs. This process can take a 20-30 minutes, so I suggest you periodically check on the status of the scan process.

GridinSoft Anti-Malware Scanning

Click on “Clean Now”.

When the scan has finished, you will see the list of infections that GridinSoft Anti-Malware has detected. To remove them click on the “Clean Now” button in right corner.

GridinSoft Anti-Malware Scan Result

Are Your Protected?

GridinSoft Anti-Malware will scan and clean your PC for free in the trial period. The free version offer real-time protection for first 2 days. If you want to be fully protected at all times – I can recommended you to purchase a full version:

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If the guide doesn’t help you to remove Sf:ShellCode-CU [Trj] you can always ask me in the comments for getting help.

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References

  1. GridinSoft Anti-Malware Review from HowToFix site: https://howtofix.guide/gridinsoft-anti-malware/
  2. More information about GridinSoft products: https://gridinsoft.com/products/

About the author

Robert Bailey

Security Engineer. Interested in malware, reverse engineering, white ethical hacking. I like coding, travelling and bikes.

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