What is the Win32:Evo-gen [Trj] virus?
Written by Robert Bailey
Spectating the Worm:Win32/Slenfbot.ALJ detection means that your computer is in big danger. This computer virus can correctly be identified as ransomware – sort of malware which ciphers your files and forces you to pay for their decryption. Removing it requires some unusual steps that must be done as soon as possible.
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Worm:Win32/Slenfbot.ALJ detection is a virus detection you can spectate in your computer. It often shows up after the provoking procedures on your PC – opening the suspicious e-mail messages, clicking the banner in the Internet or setting up the program from unreliable resources. From the second it shows up, you have a short time to take action before it starts its malicious action. And be sure – it is better not to await these malicious actions.

What is Worm:Win32/Slenfbot.ALJ virus?

Worm:Win32/Slenfbot.ALJ is ransomware-type malware. It looks for the files on your disks, encrypts it, and after that asks you to pay the ransom for getting the decryption key. Besides making your files locked, this virus also does a lot of damage to your system. It alters the networking settings in order to stop you from reading the removal guidelines or downloading the antivirus. Sometimes, Worm:Win32/Slenfbot.ALJ can even prevent the setup of anti-malware programs.

Worm:Win32/Slenfbot.ALJ Summary

In total, Worm:Win32/Slenfbot.ALJ virus actions in the infected PC are next:

  • Behavioural detection: Executable code extraction – unpacking;
  • SetUnhandledExceptionFilter detected (possible anti-debug);
  • Yara rule detections observed from a process memory dump/dropped files/CAPE;
  • Creates RWX memory;
  • Possible date expiration check, exits too soon after checking local time;
  • Anomalous file deletion behavior detected (10+);
  • A process attempted to delay the analysis task.;
  • Dynamic (imported) function loading detected;
  • Enumerates running processes;
  • Repeatedly searches for a not-found process, may want to run with startbrowser=1 option;
  • A process created a hidden window;
  • CAPE extracted potentially suspicious content;
  • Drops a binary and executes it;
  • Unconventionial language used in binary resources: Russian;
  • Authenticode signature is invalid;
  • Deletes its original binary from disk;
  • Checks for the presence of known windows from debuggers and forensic tools;
  • Likely virus infection of existing system binary;
  • Attempts to identify installed analysis tools by a known file location;
  • Checks the presence of disk drives in the registry, possibly for anti-virtualization;
  • Creates a copy of itself;
  • Encrypting the documents located on the target’s drive — so the victim cannot use these documents;
  • Blocking the launching of .exe files of security tools
  • Blocking the launching of installation files of anti-virus programs

Ransomware has been a major problem for the last 4 years. It is challenging to picture a more hazardous virus for both individual users and companies. The algorithms used in Worm:Win32/Slenfbot.ALJ (usually, RHA-1028 or AES-256) are not hackable – with minor exclusions. To hack it with a brute force, you need to have more time than our galaxy currently exists, and possibly will exist. However, that virus does not do all these bad things instantly – it can require up to a few hours to cipher all of your documents. Hence, seeing the Worm:Win32/Slenfbot.ALJ detection is a clear signal that you have to begin the removal procedure.

Where did I get the Worm:Win32/Slenfbot.ALJ?

Typical methods of Worm:Win32/Slenfbot.ALJ distribution are usual for all other ransomware examples. Those are one-day landing web pages where victims are offered to download and install the free program, so-called bait e-mails and hacktools. Bait e-mails are a relatively new method in malware distribution – you receive the e-mail that imitates some routine notifications about shippings or bank service conditions shifts. Within the email, there is an infected MS Office file, or a link which opens the exploit landing site.

Malicious email spam

Malicious email message. This one tricks you to open the phishing website.

Preventing it looks pretty simple, however, still demands a lot of awareness. Malware can hide in different spots, and it is better to stop it even before it invades your PC than to rely upon an anti-malware program. Standard cybersecurity knowledge is just an important item in the modern-day world, even if your relationship with a computer remains on YouTube videos. That can keep you a lot of money and time which you would spend while seeking a fixing guide.

Worm:Win32/Slenfbot.ALJ malware technical details

File Info:

name: BF5542D8FE09C818B714.mlw
path: /opt/CAPEv2/storage/binaries/c6af6be0cec33886f080c18d9aed20a37d959338a26d8f88532f8a55a5984333
crc32: B5A5B734
md5: bf5542d8fe09c818b714396b471319d6
sha1: 0261ab09481b772a4e9c39d7c1c2d3bec9af867d
sha256: c6af6be0cec33886f080c18d9aed20a37d959338a26d8f88532f8a55a5984333
sha512: 1e6a27c3a786091ad419212838bef7c86a12c4bdca27dbacafb7ab809f44fa758cc661efe182f9afc152d4e29256686aa6cb7433dc042eca502d698b5a9684c6
ssdeep: 3072:BAfzFsQUbuRk+ebNeWCw+FU6IR1zCV8dIHcU7422DXb8/wlrqHepgV8lVZF5s6rK:TgKNSw+NIRGTcUywmOHeeVQFL1XJOKU
type: PE32 executable (GUI) Intel 80386, for MS Windows
tlsh: T19F44120A1185165AE28A5B3DDE62BD81771C3D188FE397025FC456293F3B6E5C392B33
sha3_384: 1d385af2ad915efc530def79bb4c2a1ac3a9166c8b03e861116dbb4710902d061f5454d7f8a4918117348e5c08f53c49
ep_bytes: 558bec81c410fdffff03f3f7dabe4526
timestamp: 2004-03-10 07:51:19

Version Info:

CompanyName: Aper1 Software
FileDescription: Aper1 Internet Browser
FileVersion: 1190
InternalName: Aper1
LegalCopyright: Copyright © Oper1 Software 1995-2011
OriginalFilename: Aper1.exe
ProductName: Aper1 Internet Browser
ProductVersion: 11.01
Translation: 0x0409 0x04b0

Worm:Win32/Slenfbot.ALJ also known as:

Elasticmalicious (high confidence)
VIPRETrojan.Win32.Kryptik.lbu (v)
K7AntiVirusTrojan ( 0055dd191 )
K7GWTrojan ( 0055dd191 )
ESET-NOD32a variant of Win32/Kryptik.KRS
CynetMalicious (score: 100)
AvastWin32:Kryptik-AEV [Trj]
SophosMal/Generic-R + Mal/FakeAV-IX
EmsisoftTrojan.Ransom.Cerber.1 (B)
MAXmalware (ai score=100)
SentinelOneStatic AI – Malicious PE
RisingExploit.ShellCode!8.2A (CLOUD)
AVGWin32:Kryptik-AEV [Trj]
CrowdStrikewin/malicious_confidence_100% (D)

How to remove Worm:Win32/Slenfbot.ALJ?

Worm:Win32/Slenfbot.ALJ malware is incredibly hard to eliminate manually. It stores its files in multiple places throughout the disk, and can restore itself from one of the elements. Furthermore, countless alterations in the windows registry, networking configurations and also Group Policies are quite hard to find and change to the original. It is far better to use a special app – exactly, an anti-malware program. GridinSoft Anti-Malware will fit the most ideal for virus elimination purposes.

Why GridinSoft Anti-Malware? It is pretty light-weight and has its databases updated practically every hour. Additionally, it does not have such problems and exploits as Microsoft Defender does. The combination of these aspects makes GridinSoft Anti-Malware perfect for removing malware of any form.

Remove the viruses with GridinSoft Anti-Malware

  • Download and install GridinSoft Anti-Malware. After the installation, you will be offered to perform the Standard Scan. Approve this action.
  • Gridinsoft Anti-Malware during the scan process

  • Standard scan checks the logical disk where the system files are stored, together with the files of programs you have already installed. The scan lasts up to 6 minutes.
  • GridinSoft Anti-Malware scan results

  • When the scan is over, you may choose the action for each detected virus. For all files of [SHORT_NAME] the default option is “Delete”. Press “Apply” to finish the malware removal.
  • GridinSoft Anti-Malware - After Cleaning
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About the author

Robert Bailey

I'm Robert Bailey, a passionate Security Engineer with a deep fascination for all things related to malware, reverse engineering, and white hat ethical hacking.

As a white hat hacker, I firmly believe in the power of ethical hacking to bolster security measures. By identifying vulnerabilities and providing solutions, I contribute to the proactive defense of digital infrastructures.

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