MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e. 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: 7


Intelligence 11 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e
SHA3-384 hash: f68d71373a165c0cdbb0276c82d66d470ac4fcd14ea4c57d4b8eced5a3d86df76a0e117b3664e3ea5e6dd7147e295e6e
SHA1 hash: 2e0ab39fcd6d50f7738d92740d0177c4b41f1b9b
MD5 hash: 953ac78998807309cbf42e81829f94c0
humanhash: fanta-eleven-eight-asparagus
File name:Scan 2022.22.04_1258.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:48'640 bytes
First seen:2022-04-22 11:22:02 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 768:4DM52tfQXi8vgLZkTOHkQT51Vp6AwPdM8gQ6JT5X6DGwUdh+pqjeSLjcvLtzrxFW:462tfQXi8vgLZkTOHkQT51Vp6AwPe8gD
TLSH T1FB23B646BA5D9859E9258B7548E743E9B333FC201F6B0B833616B3257FF49E05A03207
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 IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
338603 bytesWorkbook
OLE vba

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

TypeKeywordDescription
AutoExecAuto_OpenRuns when the Excel Workbook is opened
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
1
# of downloads :
241
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/265754/
Detection(s):
SecuriteInfo.com.Macro.Downloader-19.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4DragoTrainingMontage.20210204.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4MStringFractures.20210921.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XLMConCatScratchFever.20210921.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.EmoZenith.20220420.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20210611.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
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/6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e/results/dashboard
Payload URLs
URL
File name
https://www.escueladecinemza.com.ar/_installation/IBlj/
WorkBook
Document image
Image:
Download PNG
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
75%
Tags:
macros macros-on-open regsvr32 regsvr32.exe
Link:
https://www.filescan.io/uploads/626298d5d714062bc05e56b2/reports/34f61eb4-3582-4d60-8ede-2057ea4e60d8/overview
Label:
Benign
Suspicious Score:
4.2/10
Score Malicious:
42%
Score Benign:
58%
Link:
https://www.malware.ai/gui/files/?id=b3530e95-73fc-4628-8da0-64d46157c9dc
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e
Details
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Hidden Macro 4.0
Create hunting rule
Detection:
malicious
Classification:
expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/981301
Signature
Antivirus detection for URL or domain
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)
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office process drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Regsvr32 Command Line Without DLL
Sigma detected: Regsvr32 Network Activity
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 613784 Sample: Scan 2022.22.04_1258.xls Startdate: 22/04/2022 Architecture: WINDOWS Score: 100 60 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->60 62 Antivirus detection for URL or domain 2->62 64 Multi AV Scanner detection for dropped file 2->64 66 10 other signatures 2->66 12 EXCEL.EXE 9 23 2->12         started        17 svchost.exe 2->17         started        process3 dnsIp4 52 creemo.pl 195.154.231.230, 443, 49177 OnlineSASFR France 12->52 54 escueladecinemza.com.ar 179.43.117.122, 443, 49171 DattateccomAR Argentina 12->54 56 3 other IPs or domains 12->56 44 C:\Users\user\wnrul.ocx, PE32+ 12->44 dropped 46 jo1kYi4o1Cmjy90mfvEKj324pkuET9sCm[1].dll, PE32+ 12->46 dropped 48 C:\Users\user\...\Scan 2022.22.04_1258.xls, Composite 12->48 dropped 80 Document exploit detected (creates forbidden files) 12->80 82 Document exploit detected (UrlDownloadToFile) 12->82 19 regsvr32.exe 2 12->19         started        file5 signatures6 process7 file8 42 C:\Windows\System32\...\rxdanyggu.jcx (copy), PE32+ 19->42 dropped 70 Hides that the sample has been downloaded from the Internet (zone.identifier) 19->70 23 regsvr32.exe 1 19->23         started        signatures9 process10 signatures11 72 Hides that the sample has been downloaded from the Internet (zone.identifier) 23->72 26 regsvr32.exe 1 23->26         started        process12 signatures13 76 Hides that the sample has been downloaded from the Internet (zone.identifier) 26->76 29 regsvr32.exe 1 26->29         started        process14 signatures15 78 Hides that the sample has been downloaded from the Internet (zone.identifier) 29->78 32 regsvr32.exe 1 29->32         started        process16 signatures17 58 Hides that the sample has been downloaded from the Internet (zone.identifier) 32->58 35 regsvr32.exe 1 32->35         started        process18 signatures19 68 Hides that the sample has been downloaded from the Internet (zone.identifier) 35->68 38 regsvr32.exe 2 35->38         started        process20 dnsIp21 50 138.201.142.73, 49178, 8080 HETZNER-ASDE Germany 38->50 74 System process connects to network (likely due to code injection or exploit) 38->74 signatures22
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e/
Threat name:
Document-Office.Trojan.Woreflint
Create hunting rule
Status:
Malicious
First seen:
2022-04-22 11:07:08 UTC
File Type:
Document
Extracted files:
12
AV detection:
11 of 41 (26.83%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=nl5igqbkfkajcztpmnwftu2z5asz74ej3b4jbsaaklhezwkrzwpa._file
Result
Malware family:
emotet
Create hunting rule
Score:
  10/10
Tags:
family:emotet botnet:epoch4 banker macro trojan xlm
Link:
https://tria.ge/reports/220422-ngklgsgecl/
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
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/
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.44
Link:
https://yomi.yoroi.company/submissions/6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e

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

Excel file xls 6afa83402a2a8091666f636c59d359e8259ff089d87890c80052ce4cd951cd9e

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/265754/

Comments