MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b. 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: 15


Intelligence 15 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b
SHA3-384 hash: 99711a7bfa39ee2a70bad9740242933a4a61e2a747c7e70d47b60df494267c514f7d2c5ba1b80e7fbe1ad7c13744df17
SHA1 hash: 72649006fafce65ad62619a64e9e785906198986
MD5 hash: 6e0935d0e6c119b346c499f2d8ec171e
humanhash: item-friend-mockingbird-butter
File name:SecuriteInfo.com.Exploit.ShellCode.69.18092.2332
Download: download sample
Signature Formbook
Create hunting rule
File size:67'975 bytes
First seen:2024-03-19 12:51:23 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 1536:DtP+YANB8+QiDmehCScvbLC0+We6edUadPTeOS/07vIbXwS8mo2/2:DtP+Lb8+QiDme1cv/CkRiBTeOa07vIbk
TLSH T17E63C02EE34F0955DF55A777434A4B4A05FCB33DB38540B139AC97343BAD82E4A628B8
Reporter SecuriteInfoCom
Tags:CVE-2017-11882 FormBook rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
126
Origin country :
FR FR
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b.rtf
Verdict:
Suspicious activity
Analysis date:
2024-03-19 12:52:29 UTC
Tags:
n/a
Link:
https://app.any.run/tasks/9dad9afa-a25d-4f2f-9d1f-af83718fe821

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/rtf
Has a screenshot:
False
Contains macros:
False
Detection(s):
SecuriteInfo.com.Exploit.ShellCode.69.18092.2332.UNOFFICIAL
Create hunting rule

Sanesecurity.Shelter.Malware.BadRtf.ObjUpd.UNOFFICIAL
Create hunting rule

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

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Searching for synchronization primitives
Launching a process
Using the Windows Management Instrumentation requests
Creating a window
Sending an HTTP GET request
Creating a file in the %AppData% directory
Сreating synchronization primitives
Changing an executable file
DNS request
Connection attempt
Sending a custom TCP request
Creating a process with a hidden window
Launching a service
Possible injection to a system process
Connection attempt by exploiting the app vulnerability
Creating a process from a recently created file
Launching a file downloaded from the Internet
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b/results/dashboard
Behaviour
BlacklistAPI detected
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
embedequation exploit masquerade shellcode
Link:
https://www.filescan.io/uploads/65f98a79757c624818b313e5/reports/b9aef951-5952-4f34-9462-443a2a4b27c1/overview
Verdict:
Malicious
Labled as:
CVE-2017-11882
Link:
https://www.hybrid-analysis.com/sample/cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b
Result
Verdict:
MALICIOUS
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
spre.troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/1411708
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for URL or domain
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
Document exploit detected (process start blacklist hit)
Found direct / indirect Syscall (likely to bypass EDR)
Found malware configuration
Injects a PE file into a foreign processes
Installs new ROOT certificates
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Modifies the prolog of user mode functions (user mode inline hooks)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Office equation editor establishes network connection
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Shellcode detected
Sigma detected: Base64 Encoded PowerShell Command Detected
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Equation Editor Network Connection
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Potential PowerShell Obfuscation Via Reversed Commands
Sigma detected: PowerShell Base64 Encoded FromBase64String Cmdlet
Sigma detected: Powershell download and load assembly
Sigma detected: Powershell download payload from hardcoded c2 list
Sigma detected: Script Initiated Connection to Non-Local Network
Sigma detected: Suspicious Microsoft Office Child Process
Sigma detected: WScript or CScript Dropper
Snort IDS alert for network traffic
Suspicious execution chain found
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Very long command line found
Windows Scripting host queries suspicious COM object (likely to drop second stage)
Writes to foreign memory regions
Wscript starts Powershell (via cmd or directly)
Yara detected FormBook
Yara detected Generic Downloader
Yara detected Powershell download and execute
Yara detected VBS Downloader Generic
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 1411708 Sample: SecuriteInfo.com.Exploit.Sh... Startdate: 19/03/2024 Architecture: WINDOWS Score: 100 75 Snort IDS alert for network traffic 2->75 77 Multi AV Scanner detection for domain / URL 2->77 79 Found malware configuration 2->79 81 25 other signatures 2->81 13 WINWORD.EXE 336 13 2->13         started        process3 process4 15 EQNEDT32.EXE 12 13->15         started        20 EQNEDT32.EXE 13->20         started        dnsIp5 61 103.67.162.213, 49163, 49167, 80 AARNET-AS-APAustralianAcademicandResearchNetworkAARNe unknown 15->61 45 C:\Users\user\...\pixelimagesupdate.vbs, Unicode 15->45 dropped 47 C:\Users\user\...\pixelimagesupdate[1].jpg, Unicode 15->47 dropped 63 Office equation editor establishes network connection 15->63 65 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 15->65 22 wscript.exe 11 15->22         started        file6 signatures7 process8 dnsIp9 55 paste.ee 22->55 57 104.21.84.67, 443, 49164 CLOUDFLARENETUS United States 22->57 87 System process connects to network (likely due to code injection or exploit) 22->87 89 Suspicious powershell command line found 22->89 91 Wscript starts Powershell (via cmd or directly) 22->91 95 5 other signatures 22->95 26 powershell.exe 4 22->26         started        signatures10 93 Connects to a pastebin service (likely for C&C) 55->93 process11 signatures12 103 Suspicious powershell command line found 26->103 29 powershell.exe 12 5 26->29         started        process13 dnsIp14 59 uploaddeimagens.com.br 104.21.45.138, 443, 49165, 49166 CLOUDFLARENETUS United States 29->59 105 Writes to foreign memory regions 29->105 107 Injects a PE file into a foreign processes 29->107 33 aspnet_regbrowsers.exe 29->33         started        signatures15 process16 signatures17 67 Modifies the context of a thread in another process (thread injection) 33->67 69 Maps a DLL or memory area into another process 33->69 71 Sample uses process hollowing technique 33->71 73 2 other signatures 33->73 36 explorer.exe 1 3 33->36 injected process18 dnsIp19 49 www.yrwskz.com 36->49 51 www.viescloud.com 36->51 53 13 other IPs or domains 36->53 83 System process connects to network (likely due to code injection or exploit) 36->83 85 Found direct / indirect Syscall (likely to bypass EDR) 36->85 40 svchost.exe 36->40         started        signatures20 process21 signatures22 97 Modifies the context of a thread in another process (thread injection) 40->97 99 Maps a DLL or memory area into another process 40->99 101 Tries to detect virtualization through RDTSC time measurements 40->101 43 cmd.exe 40->43         started        process23
Score:
99%
Verdict:
Malware
File Type:
SCRIPT
Link:
https://malprob.io/report/cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b
Detection:
cve-2017-11882-shellcode
Create hunting rule
Link:
https://mwdb.cert.pl/sample/cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2024-03-19 10:55:13 UTC
File Type:
Document
Extracted files:
6
AV detection:
15 of 24 (62.50%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=zx5r65wbgoguraoqxjc5iq7erxmirgsdbiomdtq4yc2ug7ufw55q._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook campaign:rc2i rat spyware stealer trojan
Link:
https://tria.ge/reports/240319-p3284adc91/
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 behavior: MapViewOfSection
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 Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Blocklisted process makes network request
Formbook payload
Formbook
Malware family:
FormBook
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/cdfb1f76c133/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b

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: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:SUSP_INDICATOR_RTF_MalVer_Objects
Create hunting rule
Author:ditekSHen
Description:Detects RTF documents with non-standard version and embedding one of the object mostly observed in exploit (e.g. CVE-2017-11882) documents.
Reference:https://github.com/ditekshen/detection

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 cdfb1f76c1338d4881d0ba45d443e48dd8889a430a1cc1ce1cc0b5437e85b77b

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/2787363/
  
Delivery method
Distributed via web download

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