MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 03319a0f6c37911983650f91c2a01b29eac84b17bd99133626d11d08952ad9d4. 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

SilentBuilder

Vendor detections: 11

Maldoc score: 3

Intelligence 11 IOCs YARA 3 File information Comments 1

SHA256 hash:	03319a0f6c37911983650f91c2a01b29eac84b17bd99133626d11d08952ad9d4
SHA3-384 hash:	1c11bf59d88393c403d3be7febbd67fddcd5c5a2a77cef23294943b202836fc494b70b436d64a76b2680d5c6bbd2cc20
SHA1 hash:	1f063a902c9ef5e13b5d92ba13f02119fd46508c
MD5 hash:	01fa0cefa12f161bcbc7cd61a8e2fb84
humanhash:	lactose-cola-magazine-friend
File name:	01fa0cefa12f161bcbc7cd61a8e2fb84
Download:	download sample
Signature	SilentBuilder Create hunting rule
File size:	115'712 bytes
First seen:	2022-01-11 20:01:49 UTC
Last seen:	2022-01-11 22:16:14 UTC
File type:	xlsx
MIME type:	application/vnd.ms-excel
ssdeep	3072:yKpb8rGYrMPe3q7Q0XV5xtezEsi8/dgQCyVEdBU6hubsll6UQjvxm:yKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgbr
TLSH	T1F0B3CF9AB21E886DEA658B3058D7439A7727EC314F6F43872615B3227FBC8D04B1350B
Reporter	zbetcheckin
Tags:	excel SilentBuilder xlsx

Office OLE Information

This malware samples appears to be an Office document. The following table provides more information about this document using oletools and oledump.

OLE id

Maldoc score: 3

OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section ID	Section size	Section name
1	4096 bytes	DocumentSummaryInformation
2	4096 bytes	SummaryInformation
3	105003 bytes	Workbook

OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

Type	Keyword	Description
AutoExec	Auto_Open	Runs when the Excel Workbook is opened
Suspicious	XLM macro	XLM macro found. It may contain malicious code

Intelligence

File Origin

# of uploads :

# of downloads :

195

Origin country :

n/a

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

01fa0cefa12f161bcbc7cd61a8e2fb84

Verdict:

No threats detected

Analysis date:

2022-01-11 20:06:10 UTC

Tags:

macros

Link:

https://app.any.run/tasks/2434a55f-0972-4346-82f6-cbd5111ea2aa

Note:

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

Verdict:

Malicious

File type:

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Has a screenshot:

False

Contains macros:

False

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/218325/

Detection(s):

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.RUNDLL32.EXE.200327.UNOFFICIAL

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.BITSADMIN.EXE.200327.UNOFFICIAL

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.URLDOWNLOADTOFILE.200415.UNOFFICIAL

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.RUNDLL32.EXE.200416.UNOFFICIAL

TwinWave.EvilDoc.Excel4Macro.HiddenSheetDLWAKEUP.20200310.UNOFFICIAL

TwinWave.EvilDoc.Excel4DragoTrainingMontage.20210204.UNOFFICIAL

TwinWave.EvilDoc.XL4MStringFractures.20210921.UNOFFICIAL

TwinWave.EvilDoc.XLSLOLBINHammerToFall.20201218.UNOFFICIAL

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20210611.UNOFFICIAL

TwinWave.EvilDoc.XL4DataopItWasGoodLivingWithYou.20211109.UNOFFICIAL

TwinWave.EvilDoc.DataOpGodGaveRockNRoll2U.20211215.UNOFFICIAL

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

DNS request

Sending a custom TCP request

Creating a window

Сreating synchronization primitives

Creating a file

Creating a process with a hidden window

Launching a process

Moving a recently created file

Sending an HTTP GET request

Launching a process by exploiting the app vulnerability

Result

Verdict:

Malicious

File Type:

Legacy Excel File

Link:

https://app.docguard.net/03319a0f6c37911983650f91c2a01b29eac84b17bd99133626d11d08952ad9d4/results/dashboard

Payload URLs

URL

File name

http://gaidov.bg/wp-includes/Ug/

WorkBook

Document image

Image:

Download PNG

Verdict:

Malicious

Threat level:

10/10

Confidence:

60%

Tags:

coinminer emotet excel.exe macros macros-on-open print.exe rundll32 stripped

Link:

https://www.filescan.io/uploads/61dde23cf2e8ec86fef1216d/reports/1fbd4c88-35b9-449d-9259-63af2c589aae/overview

Result

Verdict:

MALICIOUS

Link:

https://labs.inquest.net/dfi/sha256/03319a0f6c37911983650f91c2a01b29eac84b17bd99133626d11d08952ad9d4

Details

Autostarting Excel Macro Sheet

Excel contains Macrosheet logic that will trigger automatically upon document open.

Result

Threat name:

Hidden Macro 4.0

Detection:

malicious

Classification:

expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/918645

Signature

Antivirus detection for URL or domain

Document contains OLE streams with names of living off the land binaries

Document exploit detected (creates forbidden files)

Document exploit detected (drops PE files)

Document exploit detected (process start blacklist hit)

Document exploit detected (UrlDownloadToFile)

Drops PE files to the user root directory

Found Excel 4.0 Macro with suspicious formulas

Found malicious Excel 4.0 Macro

Hides that the sample has been downloaded from the Internet (zone.identifier)

Machine Learning detection for dropped file

Multi AV Scanner detection for domain / URL

Multi AV Scanner detection for submitted file

Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)

Office process drops PE file

Sigma detected: Microsoft Office Product Spawning Windows Shell

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

Behaviour

Behavior Graph:

Download SVG

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/03319a0f6c37911983650f91c2a01b29eac84b17bd99133626d11d08952ad9d4/

Threat name:

Document-Excel.Downloader.EncDoc

Status:

Malicious

First seen:

2022-01-11 20:02:09 UTC

File Type:

Document

Extracted files:

AV detection:

14 of 28 (50.00%)

Threat level:

3/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=amyzud3mg6irta3fb6i4fia3fhvmqsyxxwmrgnrg2eoqrfjk3hka._file

Result

Malware family:

emotet

Score:

10/10

Tags:

family:emotet banker macro trojan xlm

Link:

https://tria.ge/reports/220111-yr4r8ahad5/

Behaviour

Checks processor information in registry

Enumerates system info in registry

Modifies Internet Explorer settings

Modifies registry class

Suspicious behavior: AddClipboardFormatListener

Suspicious behavior: EnumeratesProcesses

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Enumerates physical storage devices

Drops file in System32 directory

Loads dropped DLL

Blocklisted process makes network request

Downloads MZ/PE file

Emotet

Process spawned unexpected child process

Malware Config

Dropper Extraction:

http://gaidov.bg/wp-includes/Ug/
http://studiokrishnaproduction.com/wp-includes/3mJ/

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/03319a0f6c37/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/03319a0f6c37911983650f91c2a01b29eac84b17bd99133626d11d08952ad9d4

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.