MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 659c21119c192bd5c4c698d0e9c0ef6c5d0ed38bf40907318ccbc4dece45ec76. 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: 12

Maldoc score: 3

Intelligence 12 IOCs YARA 4 File information Comments 1

SHA256 hash:	659c21119c192bd5c4c698d0e9c0ef6c5d0ed38bf40907318ccbc4dece45ec76
SHA3-384 hash:	d6d032bf5b783828a0551591959006f5d59c84b14c34634e600bdcf84bf2f591a7dee1ca4be2a9900b5f99dcf0a07dd4
SHA1 hash:	33bae7c1e8d7c4fbc54678e5a0d6b136f35eea2d
MD5 hash:	e3c8762d1a1dfdf06a7d8771d77a686e
humanhash:	potato-timing-saturn-four
File name:	e3c8762d1a1dfdf06a7d8771d77a686e
Download:	download sample
Signature	SilentBuilder Create hunting rule
File size:	120'832 bytes
First seen:	2022-01-11 17:14:16 UTC
Last seen:	2022-01-11 18:50:13 UTC
File type:	xlsx
MIME type:	application/vnd.ms-excel
ssdeep	3072:bKpb8rGYrMPe3q7Q0XV5xtezEsi8/dgtlyVEdBU6hubsll6UQjvxe:bKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgjf
TLSH	T1F1C3CF9AB25E886DEA65873048D743AA7727EC314F2F43872615B3267FFC8904B1351B
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	110483 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 :

194

Origin country :

n/a

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

https://tiworoselatan.munabarat.go.id/assets/x3J0VI59S/?name=

Verdict:

Suspicious activity

Analysis date:

2022-01-11 17:05:16 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/f5471f7f-c7ca-4c31-bad6-247eb83c8da4

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/218283/

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

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

Sending a custom TCP request by exploiting the app vulnerability

Launching a process by exploiting the app vulnerability

Result

Verdict:

Malicious

File Type:

Legacy Excel File

Link:

https://app.docguard.net/659c21119c192bd5c4c698d0e9c0ef6c5d0ed38bf40907318ccbc4dece45ec76/results/dashboard

Payload URLs

URL

File name

https://wordpressdes.vanzolini-gte.org.br/fundacaotelefonica.org.br/gAbC4QpJYI/

WorkBook

Document image

Image:

Download PNG

Verdict:

Malicious

Threat level:

10/10

Confidence:

75%

Tags:

excel.exe macros macros-on-open rundll32 stripped

Link:

https://www.filescan.io/uploads/61ddbb1ae997359713dd68a8/reports/b8e5ca05-0c5f-4c1f-91eb-3041dbcec1c7/overview

Result

Verdict:

MALICIOUS

Link:

https://labs.inquest.net/dfi/sha256/659c21119c192bd5c4c698d0e9c0ef6c5d0ed38bf40907318ccbc4dece45ec76

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/918533

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/659c21119c192bd5c4c698d0e9c0ef6c5d0ed38bf40907318ccbc4dece45ec76/

Threat name:

Document-Excel.Downloader.EncDoc

Status:

Malicious

First seen:

2022-01-11 17:15:11 UTC

File Type:

Document

Extracted files:

AV detection:

15 of 28 (53.57%)

Threat level:

3/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=mwoccem4dev5lrggtdiotqhpnroq5u4l6qeqommmzpcn5tsf5r3a._file

Result

Malware family:

emotet

Score:

10/10

Tags:

family:emotet banker macro suricata trojan xlm

Link:

https://tria.ge/reports/220111-vsj8esgffn/

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

suricata: ET MALWARE W32/Emotet CnC Beacon 3

Malware Config

Dropper Extraction:

https://wordpressdes.vanzolini-gte.org.br/fundacaotelefonica.org.br/gAbC4QpJYI/

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/659c21119c192bd5c4c698d0e9c0ef6c5d0ed38bf40907318ccbc4dece45ec76

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.