MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a3930a84abb7345b53130ebf9d06c2bb41bc01f39a365b8cc7e3b69f7ca4bc86. 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: a3930a84abb7345b53130ebf9d06c2bb41bc01f39a365b8cc7e3b69f7ca4bc86
SHA3-384 hash: 3ee0f0e6b3614bd399f14475ba3c8fe08fbc499fd3c6b7a6a78a21857d970f97e61932b8cf7d9e38ba2d6995746b3d12
SHA1 hash: c750e02de96c5ea52887dad328728deafdeb8e79
MD5 hash: 4261ec0a9edda9561c4dda5d8da7f98d
humanhash: sodium-beer-lactose-violet
File name:4261ec0a9edda9561c4dda5d8da7f98d.rtf
Download: download sample
Signature Formbook
Create hunting rule
File size:12'910 bytes
First seen:2021-02-18 05:54:11 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 384:AQtLs99/0jRGe7kQkjz4OjdjD499ZVONR4LmjB:AQtLscYeIQkjk+d/C9ZVS4LqB
TLSH 9A427DB8DE489612DB8A40638B0AFE6C582570BC93C568C5398CE3B56F56BC507339E8
Reporter abuse_ch
Tags:FormBook rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
121
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
document.doc
Verdict:
Malicious activity
Analysis date:
2021-02-18 00:32:33 UTC
Tags:
exploit CVE-2017-11882 trojan formbook stealer
Link:
https://app.any.run/tasks/9d60dd4e-a8af-45f7-ac31-c9cfa87d10b5

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
Sanesecurity.Malware.27301.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-2.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
Launching cmd.exe command interpreter
Deleting a recently created file
Sending an HTTP GET request
Launching a file downloaded from the Internet
Creating a process from a recently created file
Unauthorized injection to a system process
Result
Verdict:
Malicious
File Type:
RTF File
Link:
https://app.docguard.net/a3930a84abb7345b53130ebf9d06c2bb41bc01f39a365b8cc7e3b69f7ca4bc86/results/dashboard
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/611043
Signature
C2 URLs / IPs found in malware configuration
Drops PE files to the user root directory
Found malware configuration
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)
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)
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)
System process connects to network (likely due to code injection or exploit)
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Yara detected AntiVM_3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 354539 Sample: 4vnTrjsACd.rtf Startdate: 18/02/2021 Architecture: WINDOWS Score: 100 42 www.cbrealvitalize.com 2->42 44 cbrealvitalize.com 2->44 56 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->56 58 Found malware configuration 2->58 60 Malicious sample detected (through community Yara rule) 2->60 62 15 other signatures 2->62 11 EQNEDT32.EXE 12 2->11         started        16 WINWORD.EXE 336 20 2->16         started        18 EQNEDT32.EXE 2->18         started        signatures3 process4 dnsIp5 52 65.0.55.192, 49165, 80 AMAZON-02US United States 11->52 38 C:\Users\user\AppData\Local\...\cmd2[1].exe, PE32 11->38 dropped 40 C:\Users\Public\vbc.exe, PE32 11->40 dropped 82 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 11->82 20 vbc.exe 11->20         started        file6 signatures7 process8 signatures9 64 Multi AV Scanner detection for dropped file 20->64 66 Machine Learning detection for dropped file 20->66 68 Tries to detect virtualization through RDTSC time measurements 20->68 70 Injects a PE file into a foreign processes 20->70 23 vbc.exe 20->23         started        process10 signatures11 72 Modifies the context of a thread in another process (thread injection) 23->72 74 Maps a DLL or memory area into another process 23->74 76 Sample uses process hollowing technique 23->76 78 Queues an APC in another process (thread injection) 23->78 26 explorer.exe 23->26 injected process12 dnsIp13 46 www.acdfr.com 199.34.228.73, 49169, 80 WEEBLYUS United States 26->46 48 pandabutik.com 78.142.208.189, 49170, 80 VERIDYENVeridyenBilisimTeknolojileriSanayiveTicaretLi Turkey 26->48 50 12 other IPs or domains 26->50 80 System process connects to network (likely due to code injection or exploit) 26->80 30 rundll32.exe 9 26->30         started        34 autoconv.exe 26->34         started        signatures14 process15 dnsIp16 54 www.joeisono.com 30->54 84 System process connects to network (likely due to code injection or exploit) 30->84 86 Modifies the context of a thread in another process (thread injection) 30->86 88 Maps a DLL or memory area into another process 30->88 90 Tries to detect virtualization through RDTSC time measurements 30->90 36 cmd.exe 30->36         started        signatures17 process18
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a3930a84abb7345b53130ebf9d06c2bb41bc01f39a365b8cc7e3b69f7ca4bc86/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2021-02-18 02:16:26 UTC
AV detection:
20 of 47 (42.55%)
Threat level:
  5/5
Result
Malware family:
xloader
Create hunting rule
Score:
  10/10
Tags:
family:formbook family:xloader loader rat spyware stealer trojan
Link:
https://tria.ge/reports/210218-s62al6x9wx/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Launches Equation Editor
Modifies Internet Explorer settings
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
Drops file in Windows directory
Suspicious use of SetThreadContext
Loads dropped DLL
Uses the VBS compiler for execution
Blocklisted process makes network request
Executes dropped EXE
Xloader Payload
Formbook
Xloader
Malware Config
C2 Extraction:
http://www.rizrvd.com/bw82/
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/a3930a84abb7345b53130ebf9d06c2bb41bc01f39a365b8cc7e3b69f7ca4bc86

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 a3930a84abb7345b53130ebf9d06c2bb41bc01f39a365b8cc7e3b69f7ca4bc86

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1017044/
  
Delivery method
Distributed via web download

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