MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3af0484dd5053af767e10f83926044bd9da81b91efb870fa5a4a439d160b9e23. 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 3 File information Comments

SHA256 hash: 3af0484dd5053af767e10f83926044bd9da81b91efb870fa5a4a439d160b9e23
SHA3-384 hash: 41cb3986d2fb00cda7af492d527eb31589c62cdeab20f7aee2060f02922768446626e331bf3fc9c4fe3abf9bbd4331ab
SHA1 hash: 3685ef809fc66ccb265947c37feef5aa1a8a20fe
MD5 hash: 6f5dcc610cf5e16af06cfe9bb9c44862
humanhash: spring-alabama-illinois-jupiter
File name:tmp__yz7gqc
Download: download sample
Signature SilentBuilder
File size:48'840 bytes
First seen:2022-01-28 20:49:18 UTC
Last seen:2022-02-01 14:58:18 UTC
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 768:cUFN4Yg+Hyms5k3hbdlylKsgqopeJBWhZFGkE+cMLxAAIZcj6ehEnB7qrFBJ:cd+Hyms5k3hbdlylKsgqopeJBWhZFGk7
TLSH T1E623B6EB77CB4C89EE29037A8DB247186753EC669BE357473205B3169EB0AC08D03917
Reporter Cryptolaemus1
Tags:Emotet epoch5 SilentBuilder xlsx

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
338042 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
IOC91.240.118.172IPv4 address
SuspiciousEXECMay run an executable file or a system
SuspiciousHex StringsHex-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 :
18
# of downloads :
116
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
tmp__yz7gqc
Verdict:
Malicious activity
Analysis date:
2022-01-28 21:10:13 UTC
Tags:
macros macros40 loader

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
True
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Launching cmd.exe command interpreter
Launching a process
Running batch commands by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Payload URLs
URL
File name
http://91.240.118.172/mm/nn/se.html
Macro1
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
cmd cmd.exe macros macros-on-open stripped
Label:
Benign
Suspicious Score:
4.6/10
Score Malicious:
47%
Score Benign:
53%
Result
Verdict:
MALICIOUS
Details
Excel 4.0 Macro
Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.
IPv4 Dotted Quad URL
A URL was detected referencing a direct IP address, as opposed to a domain name.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
MSHTA Pivot
Macro may contain a pivot to an external URL resource via MSHTA.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Document With Minimal Content
Document contains less than 1 kilobyte of semantic information.
Threat name:
Document-Office.Trojan.Silentbuilder
Status:
Malicious
First seen:
2022-01-28 20:50:17 UTC
File Type:
Document
Extracted files:
8
AV detection:
17 of 28 (60.71%)
Threat level:
  5/5
Gathering data
Malware family:
Verdict:
Malicious
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:INDICATOR_OLE_Excel4Macros_DL2
Author:ditekSHen
Description:Detects OLE Excel 4 Macros documents acting as downloaders
Rule name:SUSP_Excel4Macro_AutoOpen
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.

Comments