MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5. 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: 14

Intelligence 14 IOCs YARA 2 File information Comments 1

SHA256 hash:	41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5
SHA3-384 hash:	d0cb44050eb35e75e5e3f0c5bab0eec60f8df70a89eb50b1dedf66275f64ae2a3e62c665f99c7b6fd1e73cf6d6ba2315
SHA1 hash:	99f481ad361658bbe70f3adf1e558131af3fce3f
MD5 hash:	62763ea99a08c8de0139281ea02be501
humanhash:	triple-cardinal-wyoming-batman
File name:	62763ea99a08c8de0139281ea02be501
Download:	download sample
Signature	Formbook Create hunting rule
File size:	65'991 bytes
First seen:	2024-03-21 05:02:31 UTC
Last seen:	2024-03-21 06:39:06 UTC
File type:	rtf
MIME type:	text/rtf
ssdeep	768:Ho80bq+yIoO1DkC1bTHSoowmC9cNnffEDTrdtv8CdmRZVFsBEU:XetytO11bTHSoowmC9cNf2rdty/MEU
TLSH	T12553232EE34F0955DF55D67B434A4B4A09FCB33E728500A179BC97343BAD82E4A6287C
Reporter	zbetcheckin
Tags:	CVE-2017-11882 FormBook rtf

Intelligence

File Origin

# of uploads :

# of downloads :

139

Origin country :

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5.rtf

Verdict:

Suspicious activity

Analysis date:

2024-03-21 05:03:18 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/03297462-2318-43e2-a44a-7d1ea5440958

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Verdict:

Legit

File type:

application/rtf

Has a screenshot:

False

Contains macros:

False

Detection(s):

Sanesecurity.Shelter.Malware.BadRtf.ObjUpd.UNOFFICIAL

MiscreantPunch.RTF.2017-0199.Obfus.171711.UNOFFICIAL

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for synchronization primitives

Launching a process

Creating a window

Using the Windows Management Instrumentation requests

Sending an HTTP GET request

Creating a file in the %AppData% directory

Сreating synchronization primitives

DNS request

Connection attempt

Sending a custom TCP request

Changing an executable file

Creating a process with a hidden window

Launching a service

Launching cmd.exe command interpreter

Possible injection to a system process

Connection attempt by exploiting the app vulnerability

Creating a process from a recently created file

Infecting executable files

Launching a file downloaded from the Internet

Unauthorized injection to a system process

Result

Verdict:

Malicious

File Type:

RTF File

Link:

https://app.docguard.net/41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5/results/dashboard

Behaviour

BlacklistAPI detected

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

embedequation exploit shellcode

Link:

https://www.filescan.io/uploads/65fbbf89c1137bbf149ffb07/reports/e9c810fc-52c8-494c-bada-aa2cadff6c48/overview

Verdict:

Malicious

Labled as:

CVE-2017-11882

Link:

https://www.hybrid-analysis.com/sample/41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5

Result

Threat name:

n/a

Detection:

malicious

Classification:

troj.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/1412881

Signature

Antivirus / Scanner detection for submitted sample

Connects to a pastebin service (likely for C&C)

Document exploit detected (process start blacklist hit)

Installs new ROOT certificates

Malicious sample detected (through community Yara rule)

Multi AV Scanner detection for submitted file

Office equation editor establishes network connection

Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)

Shellcode detected

Sigma detected: EQNEDT32.EXE connecting to internet

Sigma detected: Equation Editor Network Connection

Sigma detected: File Dropped By EQNEDT32EXE

Sigma detected: Script Initiated Connection to Non-Local Network

Sigma detected: Suspicious Microsoft Office Child Process

Sigma detected: WScript or CScript Dropper

System process connects to network (likely due to code injection or exploit)

Windows Scripting host queries suspicious COM object (likely to drop second stage)

Behaviour

Behavior Graph:

Download SVG

Score:

99%

Verdict:

Malware

File Type:

SCRIPT

Link:

https://malprob.io/report/41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5

Detection:

cve-2017-11882-shellcode

Link:

https://mwdb.cert.pl/sample/41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5/

Threat name:

Document-Office.Exploit.CVE-2017-11882

Status:

Malicious

First seen:

2024-03-20 07:57:08 UTC

File Type:

Document

Extracted files:

AV detection:

14 of 24 (58.33%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=igdx7n54fp5yhzxmjmunzc7d7uyyf2rfalcfwgyui63sw5tqf32q._file

Result

Malware family:

formbook

Score:

10/10

Tags:

family:formbook campaign:rc2i rat spyware stealer trojan

Link:

https://tria.ge/reports/240321-fppleade41/

Behaviour

Checks processor information in registry

Enumerates system info in registry

Launches Equation Editor

Modifies Internet Explorer settings

Modifies registry class

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

Drops file in System32 directory

Suspicious use of SetThreadContext

Blocklisted process makes network request

Formbook payload

Formbook

Malware family:

FormBook

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/41877fb7bc2b/report/overview.html

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/41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5

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_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:	SUSP_INDICATOR_RTF_MalVer_Objects Create hunting rule
Author:	ditekSHen
Description:	Detects RTF documents with non-standard version and embedding one of the object mostly observed in exploit (e.g. CVE-2017-11882) documents.
Reference:	https://github.com/ditekshen/detection

File information

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

Web download

Formbook

rtf 41877fb7bc2bfb83e6ec4b28dc8be3fd3182ea2502c45b1b1447b72b76702ef5

(this sample)

Delivery method

Distributed via web download

URLhaus

https://urlhaus.abuse.ch/url/2788215/

Comments

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zbet commented on 2024-03-21 05:02:32 UTC

url : hxxp://103.67.162.213/6090/hig/hyperloversknowthathowmuchiamfeelingonthelovewhichumadeformeireallykiissmyloverfrmtheheart____becauseshelovedmetrulyalot.doc