MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c5850b16a368ab7c8f2d03cebcc7dd51173a704cdd1d6c105ba43083a40b6063. 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 4 File information Comments 1

SHA256 hash:	c5850b16a368ab7c8f2d03cebcc7dd51173a704cdd1d6c105ba43083a40b6063
SHA3-384 hash:	3cae71efd6b6768c2aab22293cca46aa2d91aed4ac9326f8c83a0c2f3090d03dff9804d195b6a96b2d77760ccbe26b9e
SHA1 hash:	6b23cd052471a569d437b9d6d86b0130dc7ef91a
MD5 hash:	1b65d20cdf25ceebefbb478343160ed8
humanhash:	failed-neptune-pasta-timing
File name:	1b65d20cdf25ceebefbb478343160ed8
Download:	download sample
Signature	SilentBuilder Create hunting rule
File size:	115'712 bytes
First seen:	2022-01-11 17:06:30 UTC
Last seen:	2022-01-11 18:50:21 UTC
File type:	xlsx
MIME type:	application/vnd.ms-excel
ssdeep	3072:yKpb8rGYrMPe3q7Q0XV5xtezEsi8/dgQCyVEdBU6hubsll6UQjvxq:yKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgb3
TLSH	T1C4B3CF9AB21E886DEA658B3058D7439A7727EC314F6F43872615B3227FBC8D04B1350B
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 :

193

Origin country :

n/a

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

1b65d20cdf25ceebefbb478343160ed8

Verdict:

Malicious activity

Analysis date:

2022-01-11 17:31:41 UTC

Tags:

macros loader

Link:

https://app.any.run/tasks/3746f430-c53f-4067-a081-5c3bfb61f2c7

Note:

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

Verdict:

File type:

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Has a screenshot:

False

Contains macros:

False

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/218279/

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

Sending a custom TCP request

Creating a process with a hidden window

Launching a process

Moving a recently created file

Sending an HTTP GET request

Enabling autorun with the standard Software\Microsoft\Windows\CurrentVersion\Run registry branch

Launching a process by exploiting the app vulnerability

Result

Verdict:

Malicious

File Type:

Legacy Excel File

Link:

https://app.docguard.net/c5850b16a368ab7c8f2d03cebcc7dd51173a704cdd1d6c105ba43083a40b6063/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 exploit macros macros-on-open print.exe rundll32 stripped

Link:

https://www.filescan.io/uploads/61ddb9381883c5ba4ec2429f/reports/0576021b-ed66-4b8a-b0de-bfb153998a57/overview

Result

Verdict:

MALICIOUS

Link:

https://labs.inquest.net/dfi/sha256/c5850b16a368ab7c8f2d03cebcc7dd51173a704cdd1d6c105ba43083a40b6063

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/918528

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/c5850b16a368ab7c8f2d03cebcc7dd51173a704cdd1d6c105ba43083a40b6063/

Threat name:

Document-Excel.Downloader.EncDoc

Status:

Malicious

First seen:

2022-01-11 17:07:09 UTC

File Type:

Document

Extracted files:

AV detection:

13 of 28 (46.43%)

Threat level:

3/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=ywcqwfvdncvxzdznaphlzr65keltu4cm3uowyec3uqyihjalmbrq._file

Result

Malware family:

emotet

Score:

10/10

Tags:

family:emotet banker macro suricata trojan xlm

Link:

https://tria.ge/reports/220111-vmze6agfdn/

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:

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

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/c5850b16a368ab7c8f2d03cebcc7dd51173a704cdd1d6c105ba43083a40b6063

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.