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Cyber Threats
Thwarting Loaders: From SocGholish to BLISTER’s LockBit Payload

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Cyber Threats


THWARTING LOADERS: FROM SOCGHOLISH TO BLISTER’S LOCKBIT PAYLOAD

Both BLISTER and SocGholish are loaders known for their evasion tactics. Our
report details what these loaders are capable of and our investigation into a
campaign that uses both to deliver the LockBit ransomware.

By: Earle Maui Earnshaw, Mohamed Fahmy, Ian Kenefick, Ryan Maglaque, Abdelrhman
Sharshar, Lucas Silva April 05, 2022 Read time: 7 min (1847 words)

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--------------------------------------------------------------------------------

The Trend MicroTM Managed XDR team has made a series of discoveries involving
the BLISTER loader and SocGholish. We observed SocGholish’s discreet activity
despite its low detections and a BLISTER loader sample used by threat actors to
drop a LockBit payload. Close monitoring of and prompt response to both cases
prevented their respective payloads from being delivered.

Both BLISTER and SocGholish are known for their stealth and evasion tactics in
order to deliver damaging payloads. Notably, these two have been used in
campaigns together, with SocGholish dropping BLISTER as a second-stage loader.
Combined, these two loaders aim to evade detection and suspicion to drop and
execute payloads, specifically LockBit in this case. Our investigation follows
what these loaders are capable of if they not stopped from the outset.

SocGholish infrastructure

SocGholish has been around longer than BLISTER, having already established
itself well among threat actors for its advanced delivery framework. Reports
show that its framework of attack has previously been used by threat actors from
as early as 2020.

Our investigation began when the Trend Micro Managed XDR threat hunting team
flagged activity from one endpoint. Further investigation uncovered more beneath
the surface.

In this case, the user had unknowingly accessed a compromised legitimate
website, which prompted a drive-by download of a malicious file into their
system. This method of distributing malicious files is a distinct marker of
SocGholish.

The download zip file (C:\Users\victim\Downloads\download.1313a9.zip) contained
the malicious JavaScript Chrome.Update.1313a9.js, which masquerades as an update
for the browser. The contained script here is obfuscated. Thankfully, user
execution is still required for this threat to proceed.

Figure 1. Code snippet of the JavaScript

We investigated what would happen if the script were executed and learned that
this allows the malware to proceed with connecting to its command-and-control
(C&C) domain and deploy several discovery commands to gather information
regarding the system. Afterward, it logs the information into to files with .tmp
extensions.

Figure 2. PRCA of the discovery commands execution as seen in Trend Micro Vision
One™

The executed commands as seen in Figure 2 are as follows:

 * "C:\Windows\System32\cmd.exe" /C net group "domain admins" /domain
   >> "C:\Users\victim\AppData\Local\Temp\rad613A2.tmp"
 * "C:\Windows\System32\cmd.exe" /C cmdkey /list >>
   "C:\Users\victim\AppData\Local\Temp\radF9A30.tmp"
 * "C:\Windows\System32\cmd.exe" /C net user victim /domain >>
   "C:\Users\victim\AppData\Local\Temp\rad6FDE0.tmp"
 * "C:\Windows\System32\cmd.exe" /C nltest /domain_trusts >>
   "C:\Users\victim\AppData\Local\Temp\rad8B102.tmp"
 * "C:\Windows\System32\cmd.exe" /C cmdkey /list >>
   "C:\Users\victim\AppData\Local\Temp\rad2A57D.tmp"
 * "C:\Windows\System32\cmd.exe" /C nltest /dclist: >>
   "C:\Users\victim\AppData\Local\Temp\rad3FBC3.tmp"
 * "C:\Windows\System32\cmd.exe" /C whoami /all >>
   "C:\Users\victim\AppData\Local\Temp\rad95E90.tmp"

The malware then drops an additional .js file that executes a few other
discovery commands. Finally, it downloads and executes the Cobalt Strike beacon,
which is used to execute remote commands. Aside from the aforementioned scripts,
a few others were also dropped but were immediately mitigated by the product.

Figure 3. Vision One showing the deployment of JavaScript and Cobalt Strike

Low detections of Cobalt Strike and the BLISTER connection

The Cobalt Strike file was particularly interesting, because at the time of this
investigation, it had a low detection rate. We wanted to see why that was and
what evasion tactics it employed.

Date Detection Jan 19, 2022 2 Jan 20, 2022 3 Jan 26, 2022 3 Jan 31, 2022 2 Feb
7, 2022 2 Feb 10, 2022 2

Table 1. VirusTotal detection history

Indeed, further investigation showed that the Cobalt Strike file was a tampered
version of a legitimate DLL where an export function was modified to contain the
Cobalt Strike. This is the first time we have observed this in the SocGholish
infrastructure.

Figure 4. Comparison of the original DLL to the patched DLL

The sample, wimgapi.dll, will create a thread that will essentially put itself
to sleep for 10 minutes before decrypting and executing its shell code. It also
pauses operations in order to evade detection — a well-documented defense
evasion technique.

It also performs additional commands before decrypting and executing the shell
code as an added evasion tactic. These commands are the following:

 * It creates the folder C:\\ProgramData\\TermSvc.
 * It then drops drops the files C:\\ProgramData\\TermSvc\TermSvc.exe, which is
   the copy of the file (Rundll32.exe in this case ) that executes the sample
   wimgapi.dll and the file %User Startup%\\TermSvc.lnk, which executes the
   aforementioned dropped copy (Rundll32.exe).

It then proceeds to decrypt, load, and execute the shell code that connects to
the URL sikescomposite[.]com. It utilizes VirtualAlloc, VirtualProtect, and
CreateThread to decrypt the shell code and execute in memory.

We also observed the harvesting of API functions, which are called only when
needed as seen in their shell code (Figure 5). This is another tactic that
obscures the shell code.

Figure 5. The code for harvesting of API functions and calling them when needed

As a malleable Cobalt Strike C&C stager, the behavior of wimgapi.dll might be
dependent on what is downloaded from the accessed URL. With regard to this
incident, we have observed the following after its deployment

 * Account discovery
 * Pass-the-hash for privilege escalation
 * Spawned WerFault.exe process that generates the following activity: Network
   sniffing of port 135
 * Copying of browser login data
 * Lateral movement via dropping Cobalt Strike copies into remote machines

Figure 6. Dropping of Cobalt Strike to remote machines as seen in Vision One

Aside from the malicious behavior demonstrated by Cobalt Strike, one of the C&C
IP addresses (198[.]71[.]233[.]254) can be linked to Emotet and Dridex attacks.
This IP address, which is used by multiple JavaScript C&C domains, was found
hosting and dropping Emotet and Dridex samples from the end of 2021 to this
year.

The way Cobalt Strike was used in this scenario (masking tampered DLLs as
legitimate) is interesting, because we have yet to observe it in other
SocGholish campaigns. This indicates that the threat actors behind SocGholish
are selling access to or are joining forces with a third party. Interestingly,
another case investigated by the Trend Micro Managed XDR seems to show the third
party to be the threat actors behind BLISTER.

From SocGholish to BLISTER and LockBit

We also discovered the use of BLISTER loader a newer type of malware that was
first identified in December 2021, in deploying the LockBit ransomware. The
delivery of BLISTER loader might be through malicious installers, specifically
the SocGholish framework. It can also have an embedded Cobalt Strike or BitRat
payload in its resource section.

LockBit is a ransomware-as-a-service (RaaS) cartel that has one of the most
active ransomware operations today. The gang is infamous for its sophisticated
malware capabilities and strong affiliate network. It typically infects systems
using unauthorized access to internet facing infrastructure.

Curiously, the MDR team found that recent detections used BLISTER, which employs
SocGholish’s tactic of using fake browser updates to drop malicious files. It
also uses several techniques such as the following to avoid detection: 

 * Use of valid code signing certificates to persist in the system
 * Use of direct system calls to avoid hooks of the antivirus Userland
 * Delay of code execution for 10 minutes to evade sandbox detection
 * Injection of the payload into a legitimate process such as werfault.exe and
   renaming legitimate DLLs like Rundll32.exe to stay under the radar.

Likely, through the drive-by download scheme of SocGholish, the file called
ssql.exe was dropped. This file serves as a dropper that was created with
NullSoft, an open-source system for creating Windows installers, as seen in
Figure 7.

Figure 7. The ssql.exe dropper created through NullSoft

Once ssql.exe is executed, it drops a BLISTER loader sample to
%Temp%\wimgapi_64\wimgapi.dll. The file wimgapi.dll is then loaded in memory and
the export WIMDeleteImageMounts is executed.

Figure 8. BLISTER is dropped.
Figure 9. WIMDeleteImageMounts is executed.

The DLL decodes the shell code found in its RCData resource and executes it.
Similarly, the shellcode sleeps for 10 minutes and then decrypts and
decompresses the Cobalt Strike beacon.

Vision One generated an image (Figure 10) to show the infection chain based on
our samples.

Figure 10. Image of BLISTER loader’s infection chain generated through Vision
One

After the execution of the Cobalt Strike payload, the threat actors dropped and
executed batch scripts to stop antivirus agents (KillAV) running in the
environment and critical services (SQL, Veeam, Exchange, and others). The script
will also update the Group Policy Object (GPO) in the machine, add the computer
host name to a centralized text file, and creates scheduled task “updater” to
execute the batch file on startup and finally clear the Windows Events logs.

Figure 11. KillAV used by the LockBit ransomware group to try to stop antivirus
agents
Figure 12. Batch script used by the LockBit ransomware group to stop critical
services and third-party antivirus software

After successfully reaching this point, the LockBit sample would ultimately be
executed.  Our detections of the domains that were created and the SocGholish
certificates that were used suggest the likelihood that the campaign began in
November 2021 and has persisted up to the present.

Conclusion

These investigations gave us the opportunity to learn more about SocGholish and
BLISTER loader. These cases highlight the continued evolution of threats that
are made to evade detection. Notably, we observed evasive tactics like masking a
tampered DLL as legitimate and placing shell code temporarily to sleep.
Organizations should also take note of the continuing trend of using Cobalt
Strike in targeting victim entities and living-off-the-land binaries (LOLBins)
to blend in with the environment.

For these cases, close monitoring and prompt detection prevented all that was
described here from coming to pass. Early containment and mitigation are
essential to cut off more damaging attacks that compromise environments, steal
data, or deploy ransomware.

Organizations should remain vigilant and ensure that they have solid
cybersecurity measures in place. These additional security recommendations can
also help them protect their assets from modern ransomware threats like
LockBit: 

 * Enabling multifactor authentication (MFA) can prevent malicious actors from
   compromising user accounts as part of their infiltration process. 
 * Users should be wary of opening unverified emails. Embedded links should
   never be clicked and attached files should never be opened without the proper
   precautions and verification as these can kickstart the ransomware
   installation process. 
 * Organizations should always adhere to the 3-2-1 rule: Create three backup
   copies on two different file formats, with one of the backups in a separate
   location. 
 * Patching and updating software and other systems at the soonest possible time
   can address exploitable vulnerabilities that can lead to a ransomware
   infection. 
 * Organizations can better protect themselves from ransomware attacks by
   implementing multilayered security setups that combine elements such as the
   automated detection of files and other indicators with constant monitoring
   for the presence of weaponized legitimate tools in their IT environment.

New malware techniques are bound to emerge as threat actors attempt to breach
more systems. Organizations can defend themselves against such threats by using
multilayered detection and response solutions such as Trend Micro Vision One™, a
purpose-built threat defense platform that provides added value and new benefits
beyond extended detection and response (XDR) solutions. This technology provides
powerful XDR capabilities that collect and automatically correlate data across
multiple security layers — email, endpoints, servers, cloud workloads, and
networks — to prevent attacks via automated protection while also ensuring that
no significant incidents go unnoticed. 

A list of the indicators of compromise (IOCs) can be found here. 

Tags
Ransomware | Research | Articles, News, Reports | Cyber Threats


AUTHORS

 * Earle Maui Earnshaw
   
   Threats Analyst

 * Mohamed Fahmy
   
   Threat Intelligence Analyst

 * Ian Kenefick
   
   Threats Analyst

 * Ryan Maglaque
   
   Threats Analyst

 * Abdelrhman Sharshar
   
   Threat Intelligence Analyst

 * Lucas Silva
   
   Threat Analyst

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Content Adjustments
Content Scaling
Default

Readable Font
Highlight Titles
Highlight Links
Text Magnifier
Adjust Font Sizing
Default

Align Center
Adjust Line Height
Default

Align Left
Adjust Letter Spacing
Default

Align Right
Color Adjustments
Dark Contrast
Light Contrast
High Contrast
High Saturation
Adjust Text Colors
Cancel
Monochrome
Adjust Title Colors
Cancel
Low Saturation
Adjust Background Colors
Cancel
Orientation Adjustments
Mute Sounds
Hide Images
Read Mode
Reading Guide
Useful Links
Select an option Home Header Footer Main Content
Stop Animations
Reading Mask
Highlight Hover
Highlight Focus
Big Black Cursor
Big White Cursor
HIDDEN_ADJUSTMENTS
Keyboard Navigation
Accessible Mode
Screen Reader Adjustments
Read Mode
Web Accessibility Solution By accessiBe
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Accessibility StatementCompliance status

We firmly believe that the internet should be available and accessible to anyone
and are committed to providing a website that is accessible to the broadest
possible audience, regardless of ability.

To fulfill this, we aim to adhere as strictly as possible to the World Wide Web
Consortium’s (W3C) Web Content Accessibility Guidelines 2.1 (WCAG 2.1) at the AA
level. These guidelines explain how to make web content accessible to people
with a wide array of disabilities. Complying with those guidelines helps us
ensure that the website is accessible to blind people, people with motor
impairments, visual impairment, cognitive disabilities, and more.

This website utilizes various technologies that are meant to make it as
accessible as possible at all times. We utilize an accessibility interface that
allows persons with specific disabilities to adjust the website’s UI (user
interface) and design it to their personal needs.

Additionally, the website utilizes an AI-based application that runs in the
background and optimizes its accessibility level constantly. This application
remediates the website’s HTML, adapts its functionality and behavior for
screen-readers used by blind users, and for keyboard functions used by
individuals with motor impairments.

If you wish to contact the website’s owner please use the website's form

Screen-reader and keyboard navigation

Our website implements the ARIA attributes (Accessible Rich Internet
Applications) technique, alongside various behavioral changes, to ensure blind
users visiting with screen-readers can read, comprehend, and enjoy the website’s
functions. As soon as a user with a screen-reader enters your site, they
immediately receive a prompt to enter the Screen-Reader Profile so they can
browse and operate your site effectively. Here’s how our website covers some of
the most important screen-reader requirements:

 1. Screen-reader optimization: we run a process that learns the website’s
    components from top to bottom, to ensure ongoing compliance even when
    updating the website. In this process, we provide screen-readers with
    meaningful data using the ARIA set of attributes. For example, we provide
    accurate form labels; descriptions for actionable icons (social media icons,
    search icons, cart icons, etc.); validation guidance for form inputs;
    element roles such as buttons, menus, modal dialogues (popups), and others. 
    
    Additionally, the background process scans all of the website’s images. It
    provides an accurate and meaningful image-object-recognition-based
    description as an ALT (alternate text) tag for images that are not
    described. It will also extract texts embedded within the image using an OCR
    (optical character recognition) technology. To turn on screen-reader
    adjustments at any time, users need only to press the Alt+1 keyboard
    combination. Screen-reader users also get automatic announcements to turn
    the Screen-reader mode on as soon as they enter the website.
    
    These adjustments are compatible with popular screen readers such as JAWS,
    NVDA, VoiceOver, and TalkBack.
    
    
 2. Keyboard navigation optimization: The background process also adjusts the
    website’s HTML and adds various behaviors using JavaScript code to make the
    website operable by the keyboard. This includes the ability to navigate the
    website using the Tab and Shift+Tab keys, operate dropdowns with the arrow
    keys, close them with Esc, trigger buttons and links using the Enter key,
    navigate between radio and checkbox elements using the arrow keys, and fill
    them in with the Spacebar or Enter key.
    
    Additionally, keyboard users will find content-skip menus available at any
    time by clicking Alt+2, or as the first element of the site while navigating
    with the keyboard. The background process also handles triggered popups by
    moving the keyboard focus towards them as soon as they appear, not allowing
    the focus to drift outside.
    
    Users can also use shortcuts such as “M” (menus), “H” (headings), “F”
    (forms), “B” (buttons), and “G” (graphics) to jump to specific elements.

Disability profiles supported on our website
 * Epilepsy Safe Profile: this profile enables people with epilepsy to safely
   use the website by eliminating the risk of seizures resulting from flashing
   or blinking animations and risky color combinations.
 * Vision Impaired Profile: this profile adjusts the website so that it is
   accessible to the majority of visual impairments such as Degrading Eyesight,
   Tunnel Vision, Cataract, Glaucoma, and others.
 * Cognitive Disability Profile: this profile provides various assistive
   features to help users with cognitive disabilities such as Autism, Dyslexia,
   CVA, and others, to focus on the essential elements more easily.
 * ADHD Friendly Profile: this profile significantly reduces distractions and
   noise to help people with ADHD, and Neurodevelopmental disorders browse,
   read, and focus on the essential elements more easily.
 * Blind Users Profile (Screen-readers): this profile adjusts the website to be
   compatible with screen-readers such as JAWS, NVDA, VoiceOver, and TalkBack. A
   screen-reader is installed on the blind user’s computer, and this site is
   compatible with it.
 * Keyboard Navigation Profile (Motor-Impaired): this profile enables
   motor-impaired persons to operate the website using the keyboard Tab,
   Shift+Tab, and the Enter keys. Users can also use shortcuts such as “M”
   (menus), “H” (headings), “F” (forms), “B” (buttons), and “G” (graphics) to
   jump to specific elements.

Additional UI, design, and readability adjustments
 1. Font adjustments – users can increase and decrease its size, change its
    family (type), adjust the spacing, alignment, line height, and more.
 2. Color adjustments – users can select various color contrast profiles such as
    light, dark, inverted, and monochrome. Additionally, users can swap color
    schemes of titles, texts, and backgrounds with over seven different coloring
    options.
 3. Animations – epileptic users can stop all running animations with the click
    of a button. Animations controlled by the interface include videos, GIFs,
    and CSS flashing transitions.
 4. Content highlighting – users can choose to emphasize essential elements such
    as links and titles. They can also choose to highlight focused or hovered
    elements only.
 5. Audio muting – users with hearing devices may experience headaches or other
    issues due to automatic audio playing. This option lets users mute the
    entire website instantly.
 6. Cognitive disorders – we utilize a search engine linked to Wikipedia and
    Wiktionary, allowing people with cognitive disorders to decipher meanings of
    phrases, initials, slang, and others.
 7. Additional functions – we allow users to change cursor color and size, use a
    printing mode, enable a virtual keyboard, and many other functions.

Assistive technology and browser compatibility

We aim to support as many browsers and assistive technologies as possible, so
our users can choose the best fitting tools for them, with as few limitations as
possible. Therefore, we have worked very hard to be able to support all major
systems that comprise over 95% of the user market share, including Google
Chrome, Mozilla Firefox, Apple Safari, Opera and Microsoft Edge, JAWS, and NVDA
(screen readers), both for Windows and MAC users.

Notes, comments, and feedback

Despite our very best efforts to allow anybody to adjust the website to their
needs, there may still be pages or sections that are not fully accessible, are
in the process of becoming accessible, or are lacking an adequate technological
solution to make them accessible. Still, we are continually improving our
accessibility, adding, updating, improving its options and features, and
developing and adopting new technologies. All this is meant to reach the optimal
level of accessibility following technological advancements. If you wish to
contact the website’s owner, please use the website's form

Hide Accessibility Interface? Please note: If you choose to hide the
accessibility interface, you won't be able to see it anymore, unless you clear
your browsing history and data. Are you sure that you wish to hide the
interface?
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