MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 52a6c71e63ed3857be2fa0fb314ce631820994fb7e852fb66bca923efbee2380. 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: 5


Intelligence 5 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 52a6c71e63ed3857be2fa0fb314ce631820994fb7e852fb66bca923efbee2380
SHA3-384 hash: 763246e32be080f0f5c2093dab054eb8139e023b2839c4202e409379f26622acf105044fc05b86fa04d12dd792097a48
SHA1 hash: d6d9de9a098e48e29a4cb9ca12daf6f3d4644747
MD5 hash: 137af33b1dc991645b16da2688f9f4b3
humanhash: social-hydrogen-massachusetts-robin
File name:137af33b1dc991645b16da2688f9f4b3.rtf
Download: download sample
Signature Formbook
Create hunting rule
File size:12'988 bytes
First seen:2020-11-06 06:49:18 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 384:XlZjgr6HbEJayBNA1Us/fVjYUb47mPTRQKjLx:1Zq6EJfAxjVbyERQKHx
TLSH 68429EE47E8D39AAE508001AC914B9780B9EF1532FE16C9E355DE273EF0596287B0C0D
Reporter abuse_ch
Tags:CVE-2017-11882 FormBook rtf

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE dump

Intelligence

File Origin
# of uploads :
1
# of downloads :
104
Origin country :
n/a
Vendor Threat Intelligence
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
DNS request
Creating a file
Adding an access-denied ACE
Launching the default Windows debugger (dwwin.exe)
Launching cmd.exe command interpreter
Deleting a recently created file
Setting browser functions hooks
Launching a file downloaded from the Internet
Unauthorized injection to a recently created process by context flags manipulation
Sending an HTTP GET request to an infection source by exploiting the app vulnerability
Creating a process from a recently created file
Unauthorized injection to a system process
Unauthorized injection to a browser process
Result
Verdict:
MALICIOUS
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/522173
Signature
Antivirus / Scanner detection for submitted sample
Contains functionality to hide a thread from the debugger
Drops PE files to the user root directory
Hides threads from debuggers
Injects a PE file into a foreign processes
Machine Learning detection for dropped file
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 submitted file
Office equation editor drops PE file
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
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: Executables Started in Suspicious Folder
Sigma detected: Execution in Non-Executable Folder
Sigma detected: File Dropped By EQNEDT32EXE
Sigma detected: Suspicious Program Location Process Starts
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect virtualization through RDTSC time measurements
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 310182 Sample: jU0zLd44jL.rtf Startdate: 06/11/2020 Architecture: WINDOWS Score: 100 47 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->47 49 Malicious sample detected (through community Yara rule) 2->49 51 Antivirus / Scanner detection for submitted sample 2->51 53 12 other signatures 2->53 10 EQNEDT32.EXE 12 2->10         started        15 WINWORD.EXE 291 21 2->15         started        process3 dnsIp4 37 qdrenfa.com 46.173.214.75, 49167, 80 GARANT-PARK-INTERNETRU Russian Federation 10->37 31 C:\Users\user\AppData\Local\...\aus[1].exe, PE32 10->31 dropped 33 C:\Users\Public\vbc.exe, PE32 10->33 dropped 69 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 10->69 17 vbc.exe 10->17         started        file5 signatures6 process7 signatures8 39 Machine Learning detection for dropped file 17->39 41 Tries to detect virtualization through RDTSC time measurements 17->41 43 Hides threads from debuggers 17->43 45 2 other signatures 17->45 20 vbc.exe 17->20         started        process9 signatures10 55 Modifies the context of a thread in another process (thread injection) 20->55 57 Maps a DLL or memory area into another process 20->57 59 Sample uses process hollowing technique 20->59 61 Queues an APC in another process (thread injection) 20->61 23 explorer.exe 20->23 injected process11 dnsIp12 35 www.allatradinginc.net 23->35 26 cscript.exe 23->26         started        process13 signatures14 63 Modifies the context of a thread in another process (thread injection) 26->63 65 Maps a DLL or memory area into another process 26->65 67 Tries to detect virtualization through RDTSC time measurements 26->67 29 cmd.exe 26->29         started        process15
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/52a6c71e63ed3857be2fa0fb314ce631820994fb7e852fb66bca923efbee2380/
Threat name:
Document-Office.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2020-11-06 06:16:23 UTC
AV detection:
15 of 29 (51.72%)
Threat level:
  5/5
Result
Malware family:
n/a
Score:
  1/10
Tags:
n/a
Link:
https://tria.ge/reports/201106-pj34qxv3d2/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Please note that we are no longer able to provide a coverage score for Virus Total.

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: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 52a6c71e63ed3857be2fa0fb314ce631820994fb7e852fb66bca923efbee2380

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/792081/
  
Delivery method
Distributed via web download

Comments