MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332. While MalwareBazaar tries to identify whether the sample provided is malicious or not, there is no guarantee that a sample in MalwareBazaar is malicious.

Database Entry


Formbook


Vendor detections: 9


Intelligence 9 IOCs YARA 7 File information Comments
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SHA256 hash: cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332
SHA3-384 hash: 9277c078d0a0f0ac9248832c5e73af1e32d3ad7e7b64fd7fcb1f83088532fd59b9d06321abd3318da080d6b4c71267be
SHA1 hash: 1bf97c738dc4e41aae8a139db29e28b972699ba6
MD5 hash: 5a0a86f08f57c385df9626f26e1a3bc9
humanhash: mississippi-lemon-fix-twenty
File name:5a0a86f08f57c385df9626f26e1a3bc9.rtf
Download: download sample
Signature Formbook
Create hunting rule
File size:13'575 bytes
First seen:2021-04-01 13:05:08 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 384:PDgwA8OzV1UVyxM1Z0Ie8KrnTeQP1Ka8dwPpVpAuWD5:PDgwROzV2YyDKrniQE3dwP/2
TLSH D4527C408BFAE8F0CB85A1A302B5A5464429FABF671651F4798DB9603FB0211DFFD074
Reporter abuse_ch
Tags:CVE-2017-11882 FormBook rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
125
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/rtf
Has a screenshot:
False
Contains macros:
False
Detection(s):
Sanesecurity.Malware.27301.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-2.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.2017-0199.Obfus.170830.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.2017-0199.Obfus.171711.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Launching a process
Creating a window
Creating a file
Creating a file in the %temp% subdirectories
Creating a file in the Windows directory
Modifying an executable file
Creating a file in the Program Files subdirectories
Sending an HTTP GET request
Launching a file downloaded from the Internet
Enabling autorun with the shell\open\command registry branches
Forced shutdown of a system process
Creating a process from a recently created file
Infecting executable files
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332/results/dashboard
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332
Result
Threat name:
FormBook Neshta
Create hunting rule
Detection:
malicious
Classification:
spre.troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/665131
Signature
.NET source code contains potential unpacker
Antivirus detection for dropped file
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Creates an undocumented autostart registry key
Drops executable to a common third party application directory
Drops PE files to the user root directory
Drops PE files with a suspicious file extension
Found malware configuration
Infects executable files (exe, dll, sys, html)
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Yara detected FormBook
Yara detected Neshta
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 381501 Sample: 7yTix20XaT.rtf Startdate: 03/04/2021 Architecture: WINDOWS Score: 100 51 Multi AV Scanner detection for domain / URL 2->51 53 Found malware configuration 2->53 55 Malicious sample detected (through community Yara rule) 2->55 57 15 other signatures 2->57 8 EQNEDT32.EXE 12 2->8         started        13 WINWORD.EXE 293 23 2->13         started        process3 dnsIp4 41 198.23.251.121, 49165, 80 AS-COLOCROSSINGUS United States 8->41 29 C:\Users\user\AppData\Local\...\reg[1].exe, PE32 8->29 dropped 31 C:\Users\Public\vbc.exe, PE32 8->31 dropped 59 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 8->59 15 vbc.exe 5 8->15         started        file5 signatures6 process7 file8 33 C:\Windows\svchost.com, PE32 15->33 dropped 35 C:\Users\user\AppData\Local\Temp\...\vbc.exe, PE32+ 15->35 dropped 37 C:\ProgramData\...\vcredist_x86.exe, PE32 15->37 dropped 39 78 other malicious files 15->39 dropped 43 Creates an undocumented autostart registry key 15->43 45 Drops PE files with a suspicious file extension 15->45 47 Drops executable to a common third party application directory 15->47 49 Infects executable files (exe, dll, sys, html) 15->49 19 vbc.exe 15->19         started        signatures9 process10 process11 21 vbc.exe 19->21         started        23 vbc.exe 19->23         started        25 vbc.exe 19->25         started        27 2 other processes 19->27
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332/
Threat name:
Document-Office.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2021-04-01 03:05:50 UTC
AV detection:
13 of 29 (44.83%)
Threat level:
  5/5
Result
Malware family:
xloader
Create hunting rule
Score:
  10/10
Tags:
family:xloader loader persistence rat spyware stealer
Link:
https://tria.ge/reports/210401-3v4em1ga4j/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Enumerates physical storage devices
Drops file in Program Files directory
Drops file in Windows directory
Loads dropped DLL
Reads user/profile data of web browsers
Uses the VBS compiler for execution
Blocklisted process makes network request
Executes dropped EXE
Xloader Payload
Modifies system executable filetype association
Xloader
Malware Config
C2 Extraction:
http://www.scott-re.online/nnmd/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Exploit
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332

YARA Signatures

MalwareBazaar uses YARA rules from several public and non-public repositories, such as YARAhub and Malpedia. Those are being matched against malware samples uploaded to MalwareBazaar as well as against any suspicious process dumps they may create. Please note that only results from TLP:CLEAR rules are being displayed.

Rule name:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:INDICATOR_RTF_EXPLOIT_CVE_2017_11882_4
Create hunting rule
Author:ditekSHen
Description:detects RTF variant documents potentially exploiting CVE-2018-0802 or CVE-2017-11882
Rule name:INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embeding one of the object mostly observed in exploit documents.
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

Formbook

Rich Text Format (RTF) rtf cdfb17843f16222331c67ee433ed5692f2eaa53d0490f7ab3fd606c82124f332

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1101007/
  
Delivery method
Distributed via web download

Comments