MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3. 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: 7

Intelligence 12 IOCs YARA 2 File information Comments

SHA256 hash:	bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3
SHA3-384 hash:	182ba433c30aaad5684991ddb8057f7bc23867876fa8aababd880219a2492693c53f4b397cc6817b846c8f47014910da
SHA1 hash:	5cdbaecc65daea905283bfd5b020d1d54c5b197e
MD5 hash:	36b0f3d5e31df279ae732bfc2e754e2b
humanhash:	green-blossom-vermont-juliet
File name:	Lastschrift.xls
Download:	download sample
Signature	SilentBuilder Create hunting rule
File size:	48'640 bytes
First seen:	2022-04-22 11:21:03 UTC
Last seen:	Never
File type:	xls
MIME type:	application/vnd.ms-excel
ssdeep	768:4DM52tfQXi8vgLZkTOHkQT51Vp6AwPdM8gQ6JT5X6DGwUdh+pqjeSLjcvLtzrxFa:462tfQXi8vgLZkTOHkQT51Vp6AwPe8gf
TLSH	T19023B646BA5D9859E9258B7548E743E9B333FC201F6B0B833616B3257FF49E05A03207
TrID	80.2% (.XLS) Microsoft Excel sheet (32500/1/3) 19.7% (.) Generic OLE2 / Multistream Compound (8000/1)
Reporter	Anonymous
Tags:	SilentBuilder xls

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: 7

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	38603 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	Hex Strings	Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
Suspicious	Base64 Strings	Base64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
Suspicious	XLM macro	XLM macro found. It may contain malicious code

Intelligence

File Origin

# of uploads :

# of downloads :

223

Origin country :

n/a

Vendor Threat Intelligence

Verdict:

Malicious

File type:

application/vnd.ms-excel

Has a screenshot:

False

Contains macros:

True

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/265752/

Detection(s):

SecuriteInfo.com.Macro.Downloader-19.UNOFFICIAL

TwinWave.EvilDoc.Excel4DragoTrainingMontage.20210204.UNOFFICIAL

TwinWave.EvilDoc.XL4MStringFractures.20210921.UNOFFICIAL

TwinWave.EvilDoc.XLMConCatScratchFever.20210921.UNOFFICIAL

TwinWave.EvilDoc.EmoZenith.20220420.UNOFFICIAL

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20210611.UNOFFICIAL

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Сreating synchronization primitives

DNS request

Query of malicious DNS domain

Sending a TCP request to an infection source by exploiting the app vulnerability

Result

Verdict:

Malicious

File Type:

Legacy Excel File

Link:

https://app.docguard.net/bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3/results/dashboard

Payload URLs

URL

File name

https://www.escueladecinemza.com.ar/_installation/IBlj/

WorkBook

Document image

Image:

Download PNG

Verdict:

Malicious

Threat level:

10/10

Confidence:

75%

Tags:

macros macros-on-open regsvr32 regsvr32.exe

Link:

https://www.filescan.io/uploads/626298d3b5bde6a53e4151c4/reports/cf940420-0ca7-413c-8877-9ec04cb08ad3/overview

Label:

Benign

Suspicious Score:

4.0/10

Score Malicious:

41%

Score Benign:

59%

Link:

https://www.malware.ai/gui/files/?id=7398e306-6201-4444-b293-dadb69b3b522

Result

Verdict:

MALICIOUS

Link:

https://labs.inquest.net/dfi/sha256/bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3

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:

80 / 100

Link:

https://www.joesandbox.com/analysis/981303

Signature

Antivirus detection for URL or domain

Document exploit detected (UrlDownloadToFile)

Found Excel 4.0 Macro with suspicious formulas

Found malicious Excel 4.0 Macro

Multi AV Scanner detection for domain / URL

Multi AV Scanner detection for submitted file

Behaviour

Behavior Graph:

Download SVG

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3/

Threat name:

Document-Office.Trojan.Emotet

Status:

Malicious

First seen:

2022-04-22 10:15:39 UTC

File Type:

Document

Extracted files:

AV detection:

19 of 41 (46.34%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=x7ae6nse5iooenkz6yaandylb7pdl66gsnxchzfzimnmg6bl57zq._file

Result

Malware family:

emotet

Score:

10/10

Tags:

family:emotet botnet:epoch4 banker macro suricata trojan xlm

Link:

https://tria.ge/reports/220422-nf2hlsgecj/

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

Drops file in System32 directory

Loads dropped DLL

Downloads MZ/PE file

Emotet

Process spawned unexpected child process

suricata: ET MALWARE W32/Emotet CnC Beacon 3

Malware Config

C2 Extraction:

138.201.142.73:8080
138.197.147.101:443
134.195.212.50:7080
104.168.154.79:8080
149.56.131.28:8080
129.232.188.93:443
212.24.98.99:8080
119.193.124.41:7080
45.118.115.99:8080
188.44.20.25:443
103.132.242.26:8080
201.94.166.162:443
1.234.21.73:7080
206.189.28.199:8080
185.8.212.130:7080
82.165.152.127:8080
176.104.106.96:8080
173.212.193.249:8080
167.99.115.35:8080
209.126.98.206:8080
185.157.82.211:8080
212.237.17.99:8080
185.4.135.165:8080
51.91.7.5:8080
187.84.80.182:443
164.68.99.3:8080
107.182.225.142:8080
58.227.42.236:80
103.75.201.2:443
101.50.0.91:8080
216.158.226.206:443
151.106.112.196:8080
45.235.8.30:8080
146.59.226.45:443
45.176.232.124:443
134.122.66.193:8080
51.254.140.238:7080
131.100.24.231:80
167.172.253.162:8080
50.30.40.196:8080
203.114.109.124:443
94.23.45.86:4143
189.126.111.200:7080
160.16.142.56:8080
27.54.89.58:8080
5.9.116.246:8080
46.55.222.11:443
209.97.163.214:443
110.232.117.186:8080
1.234.2.232:8080
153.126.146.25:7080
183.111.227.137:8080
196.218.30.83:443
103.70.28.102:8080
51.91.76.89:8080
91.207.28.33:8080
72.15.201.15:8080
103.43.46.182:443
209.250.246.206:443
197.242.150.244:8080
159.65.88.10:8080
172.104.251.154:8080
158.69.222.101:443

Dropper Extraction:

https://www.escueladecinemza.com.ar/_installation/IBlj/
https://ciencias-exactas.com.ar/old/Bupubz1trh/
http://counteract.com.br/wp-admin/WWcACJFy3Yn/
https://creemo.pl/wp-admin/0uDUHJ4KVAw/
http://dancefox24.de/templates/owT/
http://focusmedica.in/fmlib/TYiQdcEj9FW0/

Verdict:

Malicious

Link:

https://www.vmray.com/analyses/_mb/bfc04f3644ea/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/bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3

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:	Qbot Create hunting rule
Author:	Dhanunjaya
Description:	Yara Rule to Detect Qbot

File information

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

Malspam

SilentBuilder

xls bfc04f3644ea1ce23559f600068f0b0fde35fbc6936e23e4b9431ac3782beff3

(this sample)

Delivery method

Distributed via e-mail attachment

Cape

https://www.capesandbox.com/analysis/265752/

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