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Lazarus APT Hackers Use remote SMB Tool to attack Japanese firms

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Lazarus APT Hackers Use remote SMB Tool to attack Japanese firms

Researchers from JPCERT/CC noticed that the world’s most harmful APT hackers assault Japanese group with totally different malware for throughout and after the intrusion on the focused community.

Lazarus is often known as Hidden Cobra is a North Korean APT hacker group that has been concerned with numerous excessive profile cyber-attacks numerous authorities and personal sectors across the globe since 2009.

Lazarus hacker group believed to be working underneath the North Korean state-sponsored hacking group Reconnaissance Normal Bureau and utilizing numerous assault strategies equivalent to Zerodays, spearphishing, malware, disinformation, backdoors, droppers.

Attackers utilizing the obfuscated malware for the continuing assault in opposition to Japanese organizations with a number of the sophistication functionalities to achieve entry to the community for the varied malicious actions.

One of many Malware An infection Course of

The preliminary stage of the an infection begins with obtain and executes the configuration modules and saved within the particular folder C:¥Home windows¥System32¥.

Attackers added some pointless recordsdata and bundled it as ZIP which comprises greater than 150 MB information, and the file is obfuscated used VMProtect.

The preliminary configuration file of the malware is totally encrypted, later it’s saved within the registry entry and loaded mechanically when the malware will get executed.

Right here the entire malware habits, configuration, communication format and modules.

Lazarus APT Hackers Use remote SMB Tool to attack Japanese firmsAPT Malware habits

Attackers encrypted all of the Strings within the Malware with AES128 and hardcoded the Encryption key.

Lazarus APT Hackers Use remote SMB Tool to attack Japanese firms

In response to the JPCERT/CC Report “Because the malware converts the 16-letter string to large character (32 bytes), solely the primary 16 bytes is used as a key.”

“Home windows API title can be AES-encrypted. After decrypting API strings, the tackle for the APIs which might be referred to as by LoadLibrary and GetProcAddress are resolved.”

After the profitable an infection malware, ship the HTTP request to C2 server with the next data:-

Lazarus APT Hackers Use remote SMB Tool to attack Japanese firms

Later the malware focus to downloading a module from the C2 server by way of numerous communication try. as soon as it’s efficiently downloaded, it requests the command from the C2 server the place the attackers ship the precise instructions.

Obtain the module will likely be having the varied performance of the next:-

  • Operation on recordsdata (create a listing, delete, copy, modify time created)
  • Operation on processes (create a listing, execute, kill)
  • Add/obtain recordsdata
  • Create and add a ZIP file of arbitrary listing
  • Execute arbitrary shell command
  • Get hold of disk data
  • Modify system time

Lastly, attackers unfold the an infection and leveraging account data with assist of the Python software “SMBMAP” which permits entry to the distant host by way of SMB after changing it as a Home windows PE file with Pyinstaller.

You may get the main points about Indicator of Compromise right here.

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