MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b. 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
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b
SHA3-384 hash: d8f641861c447a0ca898a1a10b9053aded5d06590a5ba2dea01d351aa2252b9d88645a5ccc98bed6a1a83bac871c02e6
SHA1 hash: 3a3c8c81cc7aee7ed88f452823ea9e7fe506153f
MD5 hash: 8afa9e9db3cc9c99e8fae411264581e5
humanhash: magazine-berlin-berlin-whiskey
File name:2022-04-22_0732.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:48'640 bytes
First seen:2022-04-22 12:20:43 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 768:4DM52tfQXi8vgLZkTOHkQT51Vp6AwPdM8gQ6JT5X6DGwUdh+pqjeSLjcvLtzrxFm:462tfQXi8vgLZkTOHkQT51Vp6AwPe8gz
TLSH T14823B646BA5D9859E9258B7548E743E9B333FC201F6B0B833616B3257FF49E05A03207
TrID 80.2% (.XLS) Microsoft Excel sheet (32500/1/3)
19.7% (.) Generic OLE2 / Multistream Compound (8000/1)
Reporter TeamDreier
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 :
205
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/265763/
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
Sending a custom TCP request
Creating a window
Сreating synchronization primitives
DNS request
Query of malicious DNS domain
Sending an HTTP GET request
Sending a TCP request to an infection source by exploiting the app vulnerability
Sending a custom TCP request by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b/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:
100%
Tags:
greyware keylogger macros macros-on-open packed regsvr32 regsvr32.exe
Link:
https://www.filescan.io/uploads/6262ada49cf9c88e50e40ac6/reports/41332f25-3360-492c-8e98-b67c8bb044f4/overview
Label:
Benign
Suspicious Score:
4.1/10
Score Malicious:
41%
Score Benign:
59%
Link:
https://www.malware.ai/gui/files/?id=e694f31b-9251-4590-8e6b-2d35792a6c9a
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b
Details
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Hidden Macro 4.0 Emotet
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/981640
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
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
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
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)
Yara detected Emotet
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 614148 Sample: 2022-04-22_0732.xls Startdate: 22/04/2022 Architecture: WINDOWS Score: 100 49 129.232.188.93 xneeloZA South Africa 2->49 51 45.235.8.30 WIKINETTELECOMUNICACOESBR Brazil 2->51 53 60 other IPs or domains 2->53 65 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->65 67 Found malware configuration 2->67 69 Antivirus detection for URL or domain 2->69 71 12 other signatures 2->71 13 EXCEL.EXE 7 20 2->13         started        signatures3 process4 dnsIp5 57 escueladecinemza.com.ar 179.43.117.122, 443, 49171 DattateccomAR Argentina 13->57 59 ciencias-exactas.com.ar 66.97.40.172, 443, 49172 DattateccomAR United States 13->59 61 www.escueladecinemza.com.ar 13->61 43 C:\Users\user\wnrul.ocx, PE32+ 13->43 dropped 45 C:\...\8jWsozWhWQgQJLtfL6S4diaibxcHphD[1].dll, PE32+ 13->45 dropped 47 C:\Users\user\Desktop\2022-04-22_0732.xls, Composite 13->47 dropped 83 Document exploit detected (creates forbidden files) 13->83 85 Document exploit detected (UrlDownloadToFile) 13->85 18 regsvr32.exe 2 13->18         started        file6 signatures7 process8 file9 41 C:\Windows\System32\...\igqpf.wmw (copy), PE32+ 18->41 dropped 73 Hides that the sample has been downloaded from the Internet (zone.identifier) 18->73 22 regsvr32.exe 1 18->22         started        signatures10 process11 signatures12 75 Hides that the sample has been downloaded from the Internet (zone.identifier) 22->75 25 regsvr32.exe 1 22->25         started        process13 signatures14 79 Hides that the sample has been downloaded from the Internet (zone.identifier) 25->79 28 regsvr32.exe 1 25->28         started        process15 signatures16 81 Hides that the sample has been downloaded from the Internet (zone.identifier) 28->81 31 regsvr32.exe 1 28->31         started        process17 signatures18 87 Hides that the sample has been downloaded from the Internet (zone.identifier) 31->87 34 regsvr32.exe 1 31->34         started        process19 signatures20 63 Hides that the sample has been downloaded from the Internet (zone.identifier) 34->63 37 regsvr32.exe 2 34->37         started        process21 dnsIp22 55 138.201.142.73, 49173, 8080 HETZNER-ASDE Germany 37->55 77 System process connects to network (likely due to code injection or exploit) 37->77 signatures23
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b/
Threat name:
Document-Excel.Trojan.Woreflint
Create hunting rule
Status:
Malicious
First seen:
2022-04-22 05:40:07 UTC
File Type:
Document
Extracted files:
12
AV detection:
17 of 41 (41.46%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=wdavfy2pnbx7ozsbl6yaxtykclq646ywxprcya5cobrr5pd62vfq._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
macro xlm
Link:
https://tria.ge/reports/220422-pja1hacba3/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Malware Config
Dropper Extraction:
https://www.escueladecinemza.com.ar/_installation/IBlj/
https://ciencias-exactas.com.ar/old/Bupubz1trh/
Malware family:
Emotet
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/_mb/b0c152e34f68/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/b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b

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 b0c152e34f686ff766415fb00bcf0a12e1ee7b16bbe22c03a270631ebc7ed54b

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/265763/

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