sLoad 2.0 -A PowerShell Based Malware Infecting Windows Systems With An Anti-Analysis Techniques – Microsoft APT

Researchers from Microsoft discovered a new version of PowerShell Based Malware sLoad 2.0 that using Background Intelligent Transfer Service (BITS) for malicious activities to attack Windows systems.

Microsoft called this new version as “Starslord” based on strings in the malware code, and this new version Sload 2.0 comes with an anti-analysis trick that helps attackers to isolate the malware analyst machine and the actual target machine.

Researchers believe that the new version 2.0 of the Sload campaign attack chain similar to the previous version and the malware authors added some updates.

In this new update, attackers added a dropping the dynamic list of command-and-control (C2) servers and upload screenshots.

Starslord (Sload 2.0) infection Process

Attackers launch the first stage of trojan via a spam email campaign with a malicious attachment that contains a WSF script and dummy GIF file.

A Windows Script File(WSF) is a file type used by the Microsoft Windows Script Host. It allows mixing the scripting languages JScript and VBScript within a single file, or other scripting languages such as Perl, Object REXX, Python, or Kixtart if installed by the user.

WSF script performs the BITS job and starts a process to download a PowerShell script with .jpg extension.

PowerShell drops 4 Random files – main.ini, domain.ini, <random>.tmp, <random>.ps1 and the PowerShell schedules to run the <random>.tmp which turns to <random>.ps1 in every 3 min.

<random>.ps1 decrypts the content of main.ini In order to perform multiple infections such as exfiltration data, download additional payload, Tracking the stage of infection and isolate the analyst machine.

According to Microsoft APT research ” With the ability to track the stage of infection, malware operators with access to the Starslord backend could build a detailed view of infections across affected machines and segregate these machines into different groups. “

To perform an anti-analysis trap, Starslord comes built-in with a function named checkUniverse to determine if a host is an analyst machine.

Attackers also can track and group affected machines based on the stage of infection using Starslord that can allow for unique infection paths.

sLoad’s multi-stage attack chain, use of mutated intermediate scripts and BITS as an alternative protocol, and its polymorphic nature which makes piece malware that can be quite difficult to detect.” Microsoft APT said.

Also Read:

Unpatched Critical IE Browser Zero-Day Vulnerability Affected Millions of Windows Users

FTCODE Ransomware Attack Windows To Encrypt Files & Steals Stored Login Credentials From Browsers

LuckyMouse Chinese APT Malware Launching Weaponized Waterholing Attack on Government Data Center

Balaji

BALAJI is an Ex-Security Researcher (Threat Research Labs) at Comodo Cybersecurity. Editor-in-Chief & Co-Founder - Cyber Security News & GBHackers On Security.

Recent Posts

Nearest Neighbor Attacks: Russian APT Hack The Target By Exploiting Nearby Wi-Fi Networks

Recent research has revealed that a Russian advanced persistent threat (APT) group, tracked as "GruesomeLarch"…

1 day ago

240+ Domains Used By PhaaS Platform ONNX Seized by Microsoft

Microsoft's Digital Crimes Unit (DCU) has disrupted a significant phishing-as-a-service (PhaaS) operation run by Egypt-based…

2 days ago

Russian TAG-110 Hacked 60+ Users With HTML Loaded & Python Backdoor

The Russian threat group TAG-110, linked to BlueDelta (APT28), is actively targeting organizations in Central…

2 days ago

Earth Kasha Upgraded Their Arsenal With New Tactics To Attack Organizations

Earth Kasha, a threat actor linked to APT10, has expanded its targeting scope to India,…

2 days ago

Raspberry Robin Employs TOR Network For C2 Servers Communication

Raspberry Robin, a stealthy malware discovered in 2021, leverages advanced obfuscation techniques to evade detection…

2 days ago

145,000 ICS Systems, Thousands of HMIs Exposed to Cyber Attacks

Critical infrastructure, the lifeblood of modern society, is under increasing threat as a new report…

2 days ago