MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 ef25940acecd4fd916e53386f63b8fb69102f2f13e2b7b9e89f64775da9afa08. 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: 7


Intelligence 7 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: ef25940acecd4fd916e53386f63b8fb69102f2f13e2b7b9e89f64775da9afa08
SHA3-384 hash: ce2a7313931eb31cfc980bc300cf2001b2ce583e3c235df6e9b1c1460357397914c3bbae7449cd79835ca9ca2644f399
SHA1 hash: df8b20801a5ee07f8de71679bb434c94858b0f9e
MD5 hash: ec733578c8fccf0e3930ddcb2b337228
humanhash: september-potato-hydrogen-zulu
File name:RFQ TK011821.doc
Download: download sample
Signature Formbook
Create hunting rule
File size:1'560'963 bytes
First seen:2021-01-18 13:42:23 UTC
Last seen:2021-01-18 16:46:51 UTC
File type:Word file doc
MIME type:text/rtf
ssdeep 192:cMDDLH5GH9baaaaaaaaaQhaawavpfbLNfrWMavSKKHGbJHN0KvpfbLNfrWMaaar7:5Dm6rn2qcLwZF1ow6vz2p3PrqLcPzh2
TLSH 3B75EF842AB92202E9DA37D5FEFB3B46F22B3025A7C11064C955DCF95C76C88D606CDB
Reporter lowmal3
Tags:FormBook

Intelligence

File Origin
# of uploads :
3
# of downloads :
123
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
RFQ TK011821.doc
Verdict:
Malicious activity
Analysis date:
2021-01-18 09:46:58 UTC
Tags:
ole-embedded exploit CVE-2017-11882
Link:
https://app.any.run/tasks/a55d6a19-3a88-4dd2-9b99-7e22f1deb6b7

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection(s):
SecuriteInfo.com.Rtf.Obfus-1.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a file in the %temp% directory
Launching a process
Creating a window
Creating a process with a hidden window
Using the Windows Management Instrumentation requests
Launching the default Windows debugger (dwwin.exe)
DNS request
Sending a custom TCP request
Bypassing of proactive protection methods using Windows Management Instrumentation (WMI)
Running batch commands by exploiting the app vulnerability
Creating a process from a recently created file
Launching a process by exploiting the app vulnerability
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/583844
Signature
Creates processes via WMI
Document exploit detected (creates forbidden files)
Found malware configuration
Found potential equation exploit (CVE-2017-11882)
Found suspicious RTF objects
Injects a PE file into a foreign processes
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Microsoft Office drops suspicious files
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
Obfuscated command line found
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines)
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Office product drops script at suspicious location
Sigma detected: WScript or CScript Dropper
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 virtualization through RDTSC time measurements
Very long command line found
Writes to foreign memory regions
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 340959 Sample: RFQ TK011821.doc Startdate: 18/01/2021 Architecture: WINDOWS Score: 100 37 www.quomic.com 2->37 39 pixie.porkbun.com 2->39 49 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->49 51 Found malware configuration 2->51 53 Malicious sample detected (through community Yara rule) 2->53 55 11 other signatures 2->55 10 powershell.exe 4 136 2->10         started        14 WINWORD.EXE 292 25 2->14         started        17 EQNEDT32.EXE 47 2->17         started        signatures3 process4 dnsIp5 47 cdn.discordapp.com 162.159.129.233, 443, 49165 CLOUDFLARENETUS United States 10->47 69 Queries sensitive network adapter information (via WMI, Win32_NetworkAdapter, often done to detect virtual machines) 10->69 71 Writes to foreign memory regions 10->71 73 Injects a PE file into a foreign processes 10->73 19 notepad.exe 10->19         started        35 C:\Users\user\AppData\Local\Temp\Client.vbs, ASCII 14->35 dropped 75 Document exploit detected (creates forbidden files) 14->75 77 Microsoft Office drops suspicious files 14->77 79 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 17->79 22 cmd.exe 17->22         started        file6 signatures7 process8 signatures9 57 Modifies the context of a thread in another process (thread injection) 19->57 59 Maps a DLL or memory area into another process 19->59 61 Sample uses process hollowing technique 19->61 63 2 other signatures 19->63 24 explorer.exe 19->24 injected 28 cscript.exe 22->28         started        process10 dnsIp11 41 all-blacknyc.com 34.102.136.180, 49167, 80 GOOGLEUS United States 24->41 43 www.rcadefurniture.com 24->43 45 www.all-blacknyc.com 24->45 65 System process connects to network (likely due to code injection or exploit) 24->65 30 wuapp.exe 24->30         started        67 Creates processes via WMI 28->67 signatures12 process13 signatures14 81 Modifies the context of a thread in another process (thread injection) 30->81 83 Maps a DLL or memory area into another process 30->83 85 Tries to detect virtualization through RDTSC time measurements 30->85 33 cmd.exe 30->33         started        process15
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/ef25940acecd4fd916e53386f63b8fb69102f2f13e2b7b9e89f64775da9afa08/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=54szicwozvh5sfxfgodpmo4pw2iqf4xrhyvxxhuj6zdxlwu27iea._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook rat spyware stealer trojan
Link:
https://tria.ge/reports/210118-vfrg1lqbc2/
Behaviour
Launches Equation Editor
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
NTFS ADS
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Blocklisted process makes network request
Formbook Payload
Formbook
Process spawned unexpected child process
Malware Config
C2 Extraction:
http://www.sob.xyz/p7v/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Bloodhound
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/ef25940acecd4fd916e53386f63b8fb69102f2f13e2b7b9e89f64775da9afa08

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_EXPLOIT_CVE_2017_11882_4
Create hunting rule
Author:ditekSHen
Description:detects RTF variant documents potentially exploiting CVE-2018-0802 or CVE-2017-11882

File information

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

Malspam

Formbook

Word file doc ef25940acecd4fd916e53386f63b8fb69102f2f13e2b7b9e89f64775da9afa08

(this sample)

  
Delivery method
Distributed via e-mail attachment

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