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holistic approach.

CHANGE USER BEHAVIOR

Help your employees identify, resist and report attacks before the damage is
done.

COMBAT DATA LOSS AND INSIDER RISK

Prevent data loss via negligent, compromised and malicious insiders by
correlating content, behavior and threats.

MODERNIZE COMPLIANCE AND ARCHIVING

Manage risk and data retention needs with a modern compliance and archiving
solution.

PROTECT CLOUD APPS

Keep your people and their cloud apps secure by eliminating threats, avoiding
data loss and mitigating compliance risk.

PREVENT LOSS FROM RANSOMWARE

Learn about this growing threat and stop attacks by securing today’s top
ransomware vector: email.

SECURE MICROSOFT 365

Implement the very best security and compliance solution for your Microsoft 365
collaboration suite.

DEFEND YOUR REMOTE WORKFORCE WITH CLOUD EDGE

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remote workers.

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Watch now to earn your CPE credits


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WHY PROOFPOINT

Today’s cyber attacks target people. Learn about our unique people-centric
approach to protection.

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Stand out and make a difference at one of the world's leading cybersecurity
companies.

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Proofpoint.

PRIVACY AND TRUST

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regulations.

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Learn about our people-centric principles and how we implement them to
positively impact our global community.


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Blog
Threat Insight
TA416 Goes to Ground and Returns with a Golang PlugX Malware Loader


TA416 GOES TO GROUND AND RETURNS WITH A GOLANG PLUGX MALWARE LOADER

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November 23, 2020 The Proofpoint Threat Research Team


EXECUTIVE SUMMARY 

Following the Chinese National Day holiday in September, Proofpoint researchers
observed a resumption of activity by the APT actor TA416. Historic campaigns by
this actor have also been publicly attributed to “Mustang Panda” and “RedDelta”.
This new activity appears to be a continuation of previously reported campaigns
that have targeted entities associated with diplomatic relations between
the Vatican and the Chinese Communist Party, as well as entities in Myanmar. The
targeting of organizations conducting diplomacy in Africa has also been
observed. Proofpoint researchers have identified updates to the actor’s
toolset which is used to deliver PlugX malware payloads. Specifically,
researchers identified a new Golang variant of TA416’s PlugX malware loader and
identified consistent usage of PlugX malware in targeted campaigns. As this
group continues to be publicly reported on by security researchers, they
exemplify a persistence in the modification of their toolset to frustrate
analysis and evade detection. While baseline changes to their payloads do not
greatly increase the difficulty of attributing TA416 campaigns, they do make
automated detection and execution of malware components independent from the
infection chain more challenging for researchers. This may represent efforts by
the group to continue their pursuit of espionage objectives while maintaining an
embattled toolset and staying out of the daily Twitter conversation popular
amongst threat researchers. 


RENEWED PHISHING ACTIVITY 

After nearly a month of inactivity following publications by threat researchers,
Proofpoint analysts have identified limited signs of renewed phishing activity
that can be attributed to the Chinese APT group TA416 (also referred to as
Mustang Panda and RedDelta) 1. Recorded Future researchers have previously noted
historic periods of dormancy following disclosure of TA416’s targeted
campaigns.2 This most recent period of inactivity encompassed September 16, 2020
through October 10, 2020. Notably this time period included the Chinese National
holiday referred to as National Day and the following unofficial vacation
period “Golden Week”. The resumption of phishing activity by TA416 included a
continued use of social engineering lures referencing the provisional agreement
recently renewed between the Vatican Holy See and the Chinese Communist Party
“CCP”.3 Additionally, spoofed email header from fields were observed that appear
to imitate journalists from the Union of Catholic Asia News. This confluence of
themed social engineering content suggests a continued focus on matters
pertaining to the evolving relationship between the Catholic Church and the
“CCP”. 


PLUGX MALWARE ANALYSIS 

Proofpoint researchers identified two RAR archives which serve as PlugX malware
droppers. One of these files was found to be a self-extracting RAR archive. For
the purposes of this analysis the self-extracting archive file
AdobelmdyU.exe|930b7a798e3279b7460e30ce2f3a2deccbc252f3ca213cb022f5b7e6a25a0867
was examined. The initial delivery vector for these RAR archives could not be
identified. However, historically TA416 has been observed including Google Drive
and Dropbox URLs within phishing emails that deliver archives
containing PlugX malware and related components. Once the RAR archive is
extracted four files are installed on the host and the portable
executable Adobelm.exe is executed. The installed files include: 

 * Adobelm.exe|0459e62c5444896d5be404c559c834ba455fa5cae1689c70fc8c61bc15468681 

A legitimate Adobe executable used in the DLL Side-Loading of Hex.dll. 

 * Adobehelp.exe|e3e3c28f7a96906e6c30f56e8e6b013e42b5113967d6fb054c32885501dfd1b7 

An unused binary that has been previously observed in malicious RAR archives
linked to TA416. 

 * hex.dll|235752f22f1a21e18e0833fc26e1cdb4834a56ee53ec7acb8a402129329c0cdd 

A Golang binary which decrypts and loads adobeupdate.dat (the PlugX payload). 

 * adobeupdate.dat|afa06df5a2c33dc0bdf80bbe09dade421b3e8b5990a56246e0d7053d5668d91 

 The encrypted PlugX malware payload. 

 

Figure 1: PlugX Malware Execution Diagram 

Following RAR extraction, Adobelm.exe, a legitimate PE that is used for the DLL
side-loading of hex.dll, is executed. It calls a PE export function of hex.dll
named CEFProcessForkHandlerEx. Historically, TA416 campaigns have used the file
name hex.dll and the same PE export name to achieve DLL side-loading for a
Microsoft Windows PE DLL. These files served as loaders and decryptors of
encrypted PlugX malware payloads. The file would read, load, decrypt, and
execute the PlugX malware payload (regularly named adobeupdate.dat, as it is in
this case).  

The PlugX malware loader found in this case was identified as a Golang binary.
Proofpoint has not previously observed this file type in use by TA416. Both
identified RAR archives were found to drop the same
encrypted PlugX malware file and Golang loader samples. The Golang loader has a
compilation creation time that dates it to June 24, 2020. However, the command
and control infrastructure discussed later in this posting suggests that
the PlugX malware payload and Golang loader variant were used after August 24,
2020. Despite the file type of the PlugX loader changing, the functionality
remains largely the same. It reads the file adobeupdate.dat, retrieves the XOR
key beginning at offset x00 and continues until it reads a null byte. It then
decrypts the payload, and finally executes the decrypted adobeupdate.dat. This
results in the execution of the PlugX malware payload which ultimately calls out
to the command and control IP 45.248.87[.]162. The following registry key is
also created during this process which runs at startup establishing the
malware’s persistence. Notably the sample uses the distinct file installation
directory “AdobelmdyU”. 

Registry Key 

Data 

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run\AdobelmdyU 

 

  

"C:\ProgramData\Adobe\AdobelmdyU\Adobelm.exe" 402 

Figure 2: PlugX malware Registry Key established for malware persistence. 


CONSISTENT TA416 TOOLS 

The PlugX malware payload, unlike the Golang loader variant, seems to remain
consistent when compared with previous versions.  

 * Historical analysis conducted by Avira and Recorded Future has documented
   that the encrypted PlugX payloads, which have been disguised as data and gif
   files, are in fact encrypted PE DLL files. These encrypted files contain a
   hardcoded XOR decryption key that begins at offset x00 and continues until a
   null byte is read.4 In this case the Golang Binary PlugX loader reads the
   encryption key in the same manner from x00 to null byte, with the hardcoded
   key ending at offset x09. This represents continued usage of an anti-analysis
   method which makes the execution of PlugX payloads more complex and
   complicates the detection of command and control infrastructure which the
   malware communicates with. 

 

Hardcoded Decryption Key / Byte Sequence 

66 59 50 6C 79 73 43 46 6C 6B 

Figure 3: PlugX malware XOR decryption key. 

 Figure 4: PlugX malware byte sequence and hardcoded XOR decryption key. 

 * Following decryption, the resulting file reflects a valid PE header for
   the PlugX malware payload. Shellcode appears between the MZ header and the
   DOS message. The function of this shellcode is to write the PE DLL into RWX
   memory and begin execution at the beginning of the file. This establishes an
   entry point for the payload and prevents an entry point not found error when
   executing the malware. This is a common technique observed by many malware
   families and is not exclusive to TA416 PlugX variants. This shellcode is
   unlikely to appear in legitimate software DLLs.Figure 5: PlugX malware byte
   sequence and XOR decryption key.


COMMAND AND CONTROL INFRASTRUCTURE 

The command and control communication observed by these PlugX malware samples
are consistent with previously documented versions. The C2 traffic was
successfully detected by an existing Proofpoint Emerging Threats Suricata
signature for PlugX malware which is publicly available as part of the ET OPEN
public ruleset.5 The following IP and example command and control communication
URLs were identified: 

 * 45.248.87[.]162 

 * hxxp://45.248.87[.]162/756d1598 

 * hxxp://45.248.87[.]162/9f86852b 

Further research regarding the command and control IP indicated that it was
hosted by the Chinese Internet Service Provider Anchnet Asia Limited. It
appeared to be active and in use as a command and control server from at least
August 24, 2020 through September 28, 2020. It is notable that this time period
predates the period of dormancy discussed above that likely resulted from
Recorded Future’s publication on TA416 activity. Additionally, it indicates that
this server ceased being used during this dormancy period possibly indicating an
infrastructure overhaul by actors during this time. 

 Figure 6: RiskIQ data indicating TA416 command and control server’s period of
activity. 


CONCLUSION 

Continued activity by TA416 demonstrates a persistent adversary making
incremental changes to documented toolsets so that they can remain effective in
carrying out espionage campaigns against global targets. The introduction of a
Golang PlugX loader alongside continued encryption efforts for PlugX payloads
suggest that the group may be conscious of increased detection for their tools
and it demonstrates adaptation in response to publications regarding their
campaigns. These tool adjustments combined with recurrent command and control
infrastructure revision suggests that TA416 will persist in their targeting of
diplomatic and religious organizations. While the specifics of the tools and
procedures have evolved it appears their motivation and targeted sectors likely
remain consistent. TA416 continues to embody the persistent aspect of “APT”
actors and Proofpoint analysts expect to continue to detect this activity in the
coming months. 


IOCS 

IOC 

IOC Type 

Description 

930b7a798e3279b7460e30ce2f3a2deccbc252f3ca213cb022f5b7e6a25a0867 

SHA256 

AdobelmdyU.exe                                                     RAR Archive
Containing PlugX  

6a5b0cfdaf402e94f892f66a0f53e347d427be4105ab22c1a9f259238c272b60 

SHA256 

Adobel.exe                                                                   
Self Extracting RAR Archive Containing PlugX  

0459e62c5444896d5be404c559c834ba455fa5cae1689c70fc8c61bc15468681 

SHA256 

Adobelm.exe                                                      Legitimate PE
that loads Golang PlugX Loader 

235752f22f1a21e18e0833fc26e1cdb4834a56ee53ec7acb8a402129329c0cdd 

SHA256 

hex.dll                                                                         
Golang binary PlugX Loader 

e3e3c28f7a96906e6c30f56e8e6b013e42b5113967d6fb054c32885501dfd1b7 

SHA256 

AdobeHelp.exe                                                         Unused PE
File 

afa06df5a2c33dc0bdf80bbe09dade421b3e8b5990a56246e0d7053d5668d917 

SHA256 

adobeupdate.dat                                                     
Encrypted PlugX Payload 

45.248.87[.]162 

C2 IP 

Command and control IP 

HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node 

\Microsoft\ Windows\CurrentVersion\Run\AdobelmdyU 

RegKey 

Registry Key that establishes PlugX malware persistence. 

Emerging Threats Signatures  

 * 2018228 - et trojan possible plugx common header struct 

 

References: 

1 Chinese State-Sponsored Group ‘RedDelta’ Targets the Vatican and Catholic
Organizations 

2 Back Despite Disruption: RedDelta Resumes Operations

3 Holy See and China renew Provisional Agreement for 2 years

4 New wave of PlugX targets Hong Kong

5 Emerging Threats Ruleset

 

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