MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 0f8330ea26ee3bcab4c05ebb384da5a60f9b10b421fbaa7660050fcc26fb9658. 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: 0f8330ea26ee3bcab4c05ebb384da5a60f9b10b421fbaa7660050fcc26fb9658
SHA3-384 hash: b648a0f5a56d54b0f4f80c227f7052fe7a77542205ee54da3029f28be81d32e6c4ad97e1955055dd131970fb2c65a70b
SHA1 hash: 380786ef1c41b71df9b16d2d7e782b4846edc6a6
MD5 hash: 042cb6af26fc965ffaf00d2733f03a01
humanhash: kansas-uniform-early-quebec
File name:Rechnung 2022.22.04_1346.xls
Download: download sample
Signature SilentBuilder
File size:48'640 bytes
First seen:2022-04-22 12:57:15 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 768:4DM52tfQXi8vgLZkTOHkQT51Vp6AwPdM8gQ6JT5X6DGwUdh+pqjeSLjcvLtzrxFG:462tfQXi8vgLZkTOHkQT51Vp6AwPe8gT
TLSH T18923B646BA5D9859E9258B7548E743E9B333FC201F6B0B833616B3257FF49E05A03207
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 :
223
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
True
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 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
Payload URLs
URL
File name
https://www.escueladecinemza.com.ar/_installation/IBlj/
WorkBook
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
75%
Tags:
macros macros-on-open regsvr32 regsvr32.exe
Label:
Benign
Suspicious Score:
4.1/10
Score Malicious:
41%
Score Benign:
59%
Result
Verdict:
MALICIOUS
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
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:
Threat name:
Document-Excel.Trojan.Emotet
Status:
Malicious
First seen:
2022-04-22 11:56:43 UTC
File Type:
Document
Extracted files:
12
AV detection:
18 of 41 (43.90%)
Threat level:
  5/5
Result
Malware family:
n/a
Score:
  10/10
Tags:
macro xlm
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/
Please note that we are no longer able to provide a coverage score for Virus Total.

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
Rule name:Qbot
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 0f8330ea26ee3bcab4c05ebb384da5a60f9b10b421fbaa7660050fcc26fb9658

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments