MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 caa3036b42a6d9a0e0a151840509d62c2042ee7c99434a3790bdc98cfe25abdd. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: caa3036b42a6d9a0e0a151840509d62c2042ee7c99434a3790bdc98cfe25abdd
SHA3-384 hash: 137a4fb9e3b3972c2fd7958e841eadbe19924f9980bcf829e7f2d14ad1b4e75e145bda34a68075abc88c7b34bc7d2bac
SHA1 hash: 8df993e9976a6e2ff23a7fbe83bebf0b35e79c95
MD5 hash: 06b8ac11fe82be792a08494d85878d84
humanhash: nineteen-illinois-grey-sierra
File name:PREP LIST FOR 04 FEBRUARY 2021.doc
Download: download sample
Signature Formbook
Create hunting rule
File size:1'997'383 bytes
First seen:2021-02-04 06:45:19 UTC
Last seen:Never
File type:Word file doc
MIME type:text/rtf
ssdeep 24576:6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vg6vgy:/xC
TLSH 9695AE7CF224BEF025188688D89A8240BF5BF34775B01507E41AEBB57FE938DF4614A6
Reporter abuse_ch
Tags:CVE-2017-11882 doc FormBook


Avatar
abuse_ch
Malspam distributing unidentified malware:

HELO: s5.bueserver.com
Sending IP: 200.123.148.189
From: Meijer Attorneys<aabb@hjlujan.com.ar>
Reply-To: aua408393@gmail.com
Subject: PREP LIST FOR 04 FEBRUARY 2021
Attachment: PREP LIST FOR 04 FEBRUARY 2021.doc

Intelligence

File Origin
# of uploads :
1
# of downloads :
120
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
PREP LIST FOR 04 FEBRUARY 2021.doc
Verdict:
Malicious activity
Analysis date:
2021-02-04 06:52:20 UTC
Tags:
ole-embedded trojan exploit CVE-2017-11882 loader formbook stealer
Link:
https://app.any.run/tasks/1c90308c-bc2c-49d6-83b2-0902f11bcf2d

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/msword
Has a screenshot:
False
Contains macros:
False
Detection(s):
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
DNS request
Creating a file
Sending a custom TCP request
Launching cmd.exe command interpreter
Setting browser functions hooks
Possible injection to a system process
Launching a process
Creating a window
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
Unauthorized injection to a browser process
Result
Verdict:
Malicious
File Type:
Fake RTF File
Link:
https://app.docguard.net/caa3036b42a6d9a0e0a151840509d62c2042ee7c99434a3790bdc98cfe25abdd/results/dashboard
Result
Verdict:
MALICIOUS
Result
Threat name:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/598759
Signature
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
Connects to a URL shortener service
Contains functionality to register a low level keyboard hook
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 submitted file
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
PowerShell case anomaly found
Queues an APC in another process (thread injection)
Sample or dropped binary is a compiled AutoHotkey binary
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 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 signatures2 2 Behavior Graph ID: 348420 Sample: PREP LIST FOR 04 FEBRUARY 2... Startdate: 04/02/2021 Architecture: WINDOWS Score: 100 61 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->61 63 Found malware configuration 2->63 65 Malicious sample detected (through community Yara rule) 2->65 67 17 other signatures 2->67 11 EQNEDT32.EXE 13 2->11         started        16 WINWORD.EXE 291 26 2->16         started        process3 dnsIp4 43 theluxdowntown.com 107.180.12.177, 49166, 80 AS-26496-GO-DADDY-COM-LLCUS United States 11->43 45 www.theluxdowntown.com 11->45 47 bit.ly 67.199.248.10, 49165, 80 GOOGLE-PRIVATE-CLOUDUS United States 11->47 37 C:\Users\user\AppData\Local\...\kali[1].txt, PE32 11->37 dropped 39 C:\Users\Public\69577.exe, PE32 11->39 dropped 89 Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802) 11->89 18 69577.exe 11->18         started        file5 signatures6 process7 signatures8 69 Very long command line found 18->69 71 Contains functionality to register a low level keyboard hook 18->71 73 PowerShell case anomaly found 18->73 75 Sample or dropped binary is a compiled AutoHotkey binary 18->75 21 powershell.exe 12 6 18->21         started        process9 dnsIp10 41 paste.ee 104.21.45.223, 443, 49167 CLOUDFLARENETUS United States 21->41 77 Writes to foreign memory regions 21->77 79 Injects a PE file into a foreign processes 21->79 25 MSBuild.exe 21->25         started        signatures11 process12 signatures13 81 Modifies the context of a thread in another process (thread injection) 25->81 83 Maps a DLL or memory area into another process 25->83 85 Sample uses process hollowing technique 25->85 87 2 other signatures 25->87 28 explorer.exe 25->28 injected process14 dnsIp15 49 cloudretailer.net 103.148.15.5, 49168, 80 INTERNETINC-AS-AP360InternetIncBD unknown 28->49 51 pero.financial 34.102.136.180, 49169, 80 GOOGLEUS United States 28->51 53 2 other IPs or domains 28->53 91 System process connects to network (likely due to code injection or exploit) 28->91 32 help.exe 28->32         started        signatures16 process17 signatures18 55 Modifies the context of a thread in another process (thread injection) 32->55 57 Maps a DLL or memory area into another process 32->57 59 Tries to detect virtualization through RDTSC time measurements 32->59 35 cmd.exe 32->35         started        process19
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/caa3036b42a6d9a0e0a151840509d62c2042ee7c99434a3790bdc98cfe25abdd/
Threat name:
Document-Office.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2021-02-04 06:46:07 UTC
AV detection:
15 of 29 (51.72%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=zkrqg22cu3m2byfbkgcakcowfqqef3t4tfbuun4qxxeyz7rfvpoq._file
Result
Malware family:
formbook
Create hunting rule
Score:
  10/10
Tags:
family:formbook rat spyware stealer trojan
Link:
https://tria.ge/reports/210204-md8fxlycbn/
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 FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Office loads VBA resources, possible macro or embedded object present
Drops file in Windows directory
Drops file in System32 directory
Suspicious use of SetThreadContext
Loads dropped DLL
Blocklisted process makes network request
Executes dropped EXE
Formbook Payload
Formbook
Malware Config
C2 Extraction:
http://www.bossbabevibesz.com/zuwc/
Dropper Extraction:
httPs://paste.ee/r/MjxkF
httPs://paste.ee/r/IYUs2
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/caa3036b42a6d9a0e0a151840509d62c2042ee7c99434a3790bdc98cfe25abdd

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_8759_2
Create hunting rule
Author:ditekSHen
Description:detects CVE-2017-8759 weaponized RTF documents.
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.

File information

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

Malspam

Formbook

Word file doc caa3036b42a6d9a0e0a151840509d62c2042ee7c99434a3790bdc98cfe25abdd

(this sample)

  
Delivery method
Distributed via e-mail attachment

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