MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 50e51f844a0653a83e215e03926f3569954fe02882cc07d127c1d8056edc7d5d. 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: 11


Intelligence 11 IOCs YARA 7 File information Comments
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SHA256 hash: 50e51f844a0653a83e215e03926f3569954fe02882cc07d127c1d8056edc7d5d
SHA3-384 hash: 767547d69be829168ac931a28e316032cd5ac8d26f6be81a93c4fddcf497f14c1cc863d797d42c3d0683557ebeeb6873
SHA1 hash: 92cdb0a86d559d8dbe9129fe2b41aeb09eb7b9bc
MD5 hash: efe63e09c4ad82e21ee9f63ed8d2f604
humanhash: network-twenty-mike-oven
File name:efe63e09c4ad82e21ee9f63ed8d2f604.rtf
Download: download sample
Signature Formbook
Create hunting rule
File size:12'274 bytes
First seen:2021-04-15 15:56:10 UTC
Last seen:Never
File type:Rich Text Format (RTF) rtf
MIME type:text/rtf
ssdeep 192:yCumHrYW6W/0SjVoK4AC2iOQ+zg8Gg62+4pNb126pb2NegrRRxHnQB7D1GL59a48:5d0W6/+qAjfzgc62HYQgrJY7D10jnvB0
TLSH AF428FAC9DB8F76DC90E924B1A6A7D0C0A3A347160E15D813C8C5FBD37ABA254F32419
Reporter abuse_ch
Tags:CVE-2017-11882 FormBook rtf

Intelligence

File Origin
# of uploads :
1
# of downloads :
118
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
efe63e09c4ad82e21ee9f63ed8d2f604.rtf
Verdict:
Malicious activity
Analysis date:
2021-04-15 15:59:10 UTC
Tags:
exploit CVE-2017-11882 loader
Link:
https://app.any.run/tasks/aa5cf3fa-a6aa-4044-8f1a-224a9accdb31

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/rtf
Has a screenshot:
False
Contains macros:
False
Detection(s):
Sanesecurity.Malware.27301.RtfHeur.BadVer.UNOFFICIAL
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SecuriteInfo.com.FakeRTF-2.UNOFFICIAL
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TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
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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/50e51f844a0653a83e215e03926f3569954fe02882cc07d127c1d8056edc7d5d/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/679333
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
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 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: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
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 AntiVM3
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 388613 Sample: yOShx2XvCx.rtf Startdate: 16/04/2021 Architecture: WINDOWS Score: 100 39 www.pinkandmint.style 2->39 41 www.girlssandfeet.com 2->41 51 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->51 53 Found malware configuration 2->53 55 Malicious sample detected (through community Yara rule) 2->55 57 12 other signatures 2->57 11 EQNEDT32.EXE 12 2->11         started        16 WINWORD.EXE 336 18 2->16         started        18 EQNEDT32.EXE 2->18         started        signatures3 process4 dnsIp5 49 172.245.45.28, 49165, 80 AS-COLOCROSSINGUS United States 11->49 35 C:\Users\user\AppData\Local\...\kn[1].exe, PE32 11->35 dropped 37 C:\Users\Public\vbc.exe, PE32 11->37 dropped 75 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 11->75 20 vbc.exe 2 11->20         started        file6 signatures7 process8 signatures9 59 Multi AV Scanner detection for dropped file 20->59 61 Tries to detect virtualization through RDTSC time measurements 20->61 63 Injects a PE file into a foreign processes 20->63 23 vbc.exe 20->23         started        process10 signatures11 65 Modifies the context of a thread in another process (thread injection) 23->65 67 Maps a DLL or memory area into another process 23->67 69 Sample uses process hollowing technique 23->69 71 Queues an APC in another process (thread injection) 23->71 26 explorer.exe 23->26 injected process12 dnsIp13 43 www.mysticbali.com 154.86.237.195, 49166, 80 DXTL-HKDXTLTseungKwanOServiceHK Seychelles 26->43 45 www.project99x.com 26->45 47 4 other IPs or domains 26->47 73 System process connects to network (likely due to code injection or exploit) 26->73 30 wlanext.exe 26->30         started        signatures14 process15 signatures16 77 Modifies the context of a thread in another process (thread injection) 30->77 79 Maps a DLL or memory area into another process 30->79 81 Tries to detect virtualization through RDTSC time measurements 30->81 33 cmd.exe 30->33         started        process17
Detection:
formbook
Create hunting rule
Link:
https://mwdb.cert.pl/sample/50e51f844a0653a83e215e03926f3569954fe02882cc07d127c1d8056edc7d5d/
Threat name:
Document-RTF.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2021-04-14 10:02:16 UTC
AV detection:
12 of 29 (41.38%)
Threat level:
  5/5
Result
Malware family:
formbook
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Score:
  10/10
Tags:
family:formbook rat spyware stealer trojan
Link:
https://tria.ge/reports/210415-vkrzc821mx/
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: GetForegroundWindowSpam
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
Formbook Payload
Formbook
Malware Config
C2 Extraction:
http://www.yabo101games.net/dps/
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/50e51f844a0653a83e215e03926f3569954fe02882cc07d127c1d8056edc7d5d

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
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Author:James_inthe_box
Description:Email in files like avemaria
Rule name:INDICATOR_RTF_EXPLOIT_CVE_2017_11882_4
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Author:ditekSHen
Description:detects RTF variant documents potentially exploiting CVE-2018-0802 or CVE-2017-11882
Rule name:INDICATOR_RTF_MalVer_Objects
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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
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Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
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Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
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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 50e51f844a0653a83e215e03926f3569954fe02882cc07d127c1d8056edc7d5d

(this sample)

  
URLhaus
https://urlhaus.abuse.ch/url/1115188/
  
Delivery method
Distributed via web download

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