MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 4d21115441459063cf8403f94d3bb37201666be30622cb2cb4e2ffb32827192f. 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 3 File information Comments

SHA256 hash:	4d21115441459063cf8403f94d3bb37201666be30622cb2cb4e2ffb32827192f
SHA3-384 hash:	bb4bb8db1a61b3e021dc56d50b2390fdd173ccb5ab0ff9118c5b7fb7376973478c0529faf40dbaed4aaab90f560c6d0e
SHA1 hash:	773b3ff48428bdacf2afeb7fc9fd1261a2e0591c
MD5 hash:	8d1d1df2277e8730eee7de7fe28f60e1
humanhash:	thirteen-apart-connecticut-cat
File name:	Results12232021.xls
Download:	download sample
Signature	SilentBuilder Create hunting rule
File size:	423'936 bytes
First seen:	2021-12-23 15:58:17 UTC
Last seen:	2021-12-23 18:19:11 UTC
File type:	xls
MIME type:	application/vnd.ms-excel
ssdeep	6144:Ml19aFmvPvdF+Xgrm8OWt2rtJuSGsejbOJ:wDasPvKQRdWaSMbK
TLSH	T1799409BFE277CE57D6A1B9704D878B90B516B81E03490E96EC4C316CBF113A4288DED6
Reporter	604Kuzushi
Tags:	SilentBuilder xls

604Kuzushi

Sleeps for a long time to evade automatic sandbox detonation
C:\Windows\system32\dwwin.exe -x -s 4700

Email lure
Dear Employee,
The company has been notified that 96% of our employees has been diagnosed with OMICRON variant of COVID-19. We conducted an investigation to determine co-workers who may have had close contact with the confirmed-positive employee.
As such, you have been identified as an employee who may have been exposed to this virus between December, 18th and December, 19th Please, look at the results in the attached documents immediately to see your chance of having OMICRON variant of COVID-19.

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 4 sections in this file using oledump:

Section ID	Section size	Section name
1	114 bytes	CompObj
2	284 bytes	DocumentSummaryInformation
3	232 bytes	SummaryInformation
4	417248 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 :

200

Origin country :

n/a

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

Results12232021.xls

Verdict:

No threats detected

Analysis date:

2021-12-23 16:00:56 UTC

Tags:

n/a

Link:

https://app.any.run/tasks/b7ee9343-dd8d-4230-90ae-eb7ed06be703

Note:

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

Verdict:

Malicious

File type:

application/vnd.ms-excel

Has a screenshot:

False

Contains macros:

False

Detection:

DridexV4

Link:

https://www.capesandbox.com/analysis/216000/

Detection(s):

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.SHELLEXECUTE.200416.UNOFFICIAL

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.SHELLEXECUTE.200524.UNOFFICIAL

TwinWave.EvilDoc.XLSLOLBINHammerToFall.20201218.UNOFFICIAL

TwinWave.EvilDoc.XL4MWMICHumnError.20210421.UNOFFICIAL

TwinWave.EvilDoc.DridexArterial.20211208.UNOFFICIAL

TwinWave.EvilDoc.DridexUManiac.20211215.UNOFFICIAL

TwinWave.EvilDoc.DridexUManiac.M2.20211215.UNOFFICIAL

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

DNS request

Creating a window

Сreating synchronization primitives

Creating a file

Launching a process

Launching a process by exploiting the app vulnerability

Result

Verdict:

Malicious

File Type:

Legacy Excel File

Link:

https://app.docguard.net/4d21115441459063cf8403f94d3bb37201666be30622cb2cb4e2ffb32827192f/results/dashboard

Document image

Image:

Download PNG

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

macros macros-on-open mshta stripped

Link:

https://www.filescan.io/uploads/61c49cc98991ba72b393e438/reports/eaf5fdc5-8b0f-4e51-8230-64ef82325fda/overview

Result

Threat name:

Hidden Macro 4.0 Dridex

Detection:

malicious

Classification:

troj.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/912101

Signature

C2 URLs / IPs found in malware configuration

Contains functionality to create processes via WMI

Creates and opens a fake document (probably a fake document to hide exploiting)

Creates processes via WMI

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

Document exploit detected (process start blacklist hit)

Found abnormal large hidden Excel 4.0 Macro sheet

Found Excel 4.0 Macro with suspicious formulas

Found malicious Excel 4.0 Macro

Found malware configuration

Multi AV Scanner detection for submitted file

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

Sigma detected: Microsoft Office Product Spawning Windows Shell

Sigma detected: Regsvr32 Command Line Without DLL

Tries to delay execution (extensive OutputDebugStringW loop)

Yara detected Dridex unpacked file

Yara detected hidden Macro 4.0 in Excel

Behaviour

Behavior Graph:

Download SVG

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/4d21115441459063cf8403f94d3bb37201666be30622cb2cb4e2ffb32827192f/

Threat name:

Document-Excel.Trojan.Abracadabra

Status:

Malicious

First seen:

2021-12-23 15:59:08 UTC

File Type:

Document

Extracted files:

AV detection:

16 of 43 (37.21%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=juqrcvcbiwight4eap4u2o5toiawm27dayrmwlfu4l73gkbhdexq._file

Result

Malware family:

dridex

Score:

10/10

Tags:

family:dridex botnet:22201 botnet loader

Link:

https://tria.ge/reports/211223-te3beaabd2/

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 AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Process spawned suspicious child process

Loads dropped DLL

Blocklisted process makes network request

Downloads MZ/PE file

Dridex Loader

Dridex

Process spawned unexpected child process

Malware Config

C2 Extraction:

144.91.122.102:443
85.10.248.28:593
185.4.135.27:5228
80.211.3.13:8116

Malware family:

Dridex

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/4d2111544145/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/4d21115441459063cf8403f94d3bb37201666be30622cb2cb4e2ffb32827192f

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:	Excel_Hidden_Macro_Sheet Create hunting rule

Rule name:	INDICATOR_OLE_Excel4Macros_DL2 Create hunting rule
Author:	ditekSHen
Description:	Detects OLE Excel 4 Macros documents acting as downloaders

Rule name:	SUSP_Excel4Macro_AutoOpen Create hunting rule
Author:	John Lambert @JohnLaTwC
Description:	Detects Excel4 macro use with auto open / close

File information

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

Malspam

SilentBuilder

xls 4d21115441459063cf8403f94d3bb37201666be30622cb2cb4e2ffb32827192f

(this sample)

Dropping

Probably Dridex

Delivery method

Distributed via e-mail attachment

Cape

https://www.capesandbox.com/analysis/216000/

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