MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597. 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: 13


Maldoc score: 5


Intelligence 13 IOCs YARA 7 File information Comments 1
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597
SHA3-384 hash: 25c1a6266aab208336637ad9b59f76f04187aa5d206c2ce0e83dd70113a0704cd62a4ee26aa9388aaaf055ed279dce9d
SHA1 hash: 3f4adc444898791d0ebfdb65bacaf9b768597a78
MD5 hash: a1041560cf855640134ce2d5afea9c94
humanhash: missouri-carpet-whiskey-butter
File name:a1041560cf855640134ce2d5afea9c94
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:66'318 bytes
First seen:2022-01-17 22:07:48 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 1536:5lNk3hbdlylKsgqopeJBWhZFGkE+cL2NdAfNzMk95+ooipzMk9o+oo:5Hk3hbdlylKsgqopeJBWhZFGkE+cL2NU
TLSH T170536C56BB8799CADA4253358DF34359B327FC168FA7C3473554B3290EB5AA08C03A1B
Reporter zbetcheckin
Tags:excel 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: 5
OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
355722 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)
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
1
# of downloads :
233
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
a1041560cf855640134ce2d5afea9c94
Verdict:
Malicious activity
Analysis date:
2022-01-17 23:26:07 UTC
Tags:
macros macros40 loader trojan
Link:
https://app.any.run/tasks/84acc4ae-2b71-44ce-8e3d-fdd33201bc23

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
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/219942/
Detection(s):
SecuriteInfo.com.Trojan.GenericKD.47707798.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXRSTRGOOD.MSHTA.210816.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.HiddenSheetExcel4LureRecognizer.20200915.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4MacroLuresWatchingTheDectives.20210115.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.Excel4HateMeSometimes.20210819.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOODXL4.HTTP
Create hunting rule

TwinWave.EvilDoc.DridexUManiac.20211215.UNOFFICIAL
Create hunting rule

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 a process
Sending an HTTP GET request
Running batch commands by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597/results/dashboard
Document image
Image:
Download PNG
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
cmd cmd.exe excel.exe macros macros-on-open mshta mshta.exe print.exe stripped
Link:
https://www.filescan.io/uploads/61e5e8c5d32385db63fd9d32/reports/09189433-7c1a-4f64-9c8b-5c1b818702f5/overview
Label:
Malicious
Suspicious Score:
7.7/10
Score Malicious:
77%
Score Benign:
23%
Link:
https://www.malware.ai/gui/files/?id=3689158c-d3b1-4d72-8cba-b00f3707b278
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597
Details
Excel 4.0 Macro
Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
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.
Result
Threat name:
Hidden Macro 4.0
Create hunting rule
Detection:
malicious
Classification:
expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/922058
Signature
Antivirus detection for URL or domain
Document exploit detected (process start blacklist hit)
Found Excel 4.0 Macro with suspicious formulas
Hides that the sample has been downloaded from the Internet (zone.identifier)
Machine Learning detection for dropped file
Multi AV Scanner detection for submitted file
Obfuscated command line found
Powershell drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: MSHTA Spawning Windows Shell
Sigma detected: Suspicious MSHTA Process Patterns
Sigma detected: Suspicious PowerShell Command Line
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: 554538 Sample: EgOGozyE1I Startdate: 17/01/2022 Architecture: WINDOWS Score: 100 55 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->55 57 Antivirus detection for URL or domain 2->57 59 Multi AV Scanner detection for submitted file 2->59 61 9 other signatures 2->61 14 EXCEL.EXE 7 10 2->14         started        18 svchost.exe 2->18         started        process3 file4 49 C:\Users\user\DesktopgOGozyE1I.xls, Composite 14->49 dropped 69 Obfuscated command line found 14->69 20 cmd.exe 14->20         started        signatures5 process6 process7 22 mshta.exe 11 20->22         started        dnsIp8 51 193.42.36.245, 49167, 49168, 80 EENET-ASEE Lithuania 22->51 25 powershell.exe 12 7 22->25         started        process9 dnsIp10 53 mecaglobal.com 198.12.243.55, 49169, 80 AS-26496-GO-DADDY-COM-LLCUS United States 25->53 47 C:\Users\Public\Documents\ssd.dll, PE32 25->47 dropped 67 Powershell drops PE file 25->67 30 cmd.exe 25->30         started        file11 signatures12 process13 process14 32 rundll32.exe 30->32         started        process15 34 rundll32.exe 2 32->34         started        file16 45 C:\Windows\...\pazxzdfrgssyd.ekd (copy), PE32 34->45 dropped 63 Hides that the sample has been downloaded from the Internet (zone.identifier) 34->63 38 rundll32.exe 34->38         started        signatures17 process18 process19 40 rundll32.exe 1 38->40         started        signatures20 65 Hides that the sample has been downloaded from the Internet (zone.identifier) 40->65 43 rundll32.exe 40->43         started        process21
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597/
Threat name:
Document-Excel.Trojan.Emotet
Create hunting rule
Status:
Malicious
First seen:
2022-01-17 22:08:09 UTC
File Type:
Document
Extracted files:
8
AV detection:
15 of 28 (53.57%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=noavg5nkvkt6kqglupddeopae67ckusivvxoqwm5wfgzqyagcwlq._file
Result
Malware family:
emotet
Create hunting rule
Score:
  10/10
Tags:
family:emotet banker macro suricata trojan xlm
Link:
https://tria.ge/reports/220117-11774sdefl/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Gathers network information
Gathers system information
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Drops file in System32 directory
Suspicious use of SetThreadContext
Checks computer location settings
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Executes dropped EXE
NirSoft MailPassView
Nirsoft
Emotet
Process spawned unexpected child process
suricata: ET MALWARE W32/Emotet CnC Beacon 3
Malware Config
Dropper Extraction:
http://0xc12a24f5/cc.html
http://193.42.36.245/PP91.PNG
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/6b815375aaaa/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/6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597

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:INDICATOR_DOC_PhishingPatterns
Create hunting rule
Author:ditekSHen
Description:Detects OLE, RTF, PDF and OOXML (decompressed) documents with common phishing strings
Rule name:INDICATOR_OLE_Excel4Macros_DL2
Create hunting rule
Author:ditekSHen
Description:Detects OLE Excel 4 Macros documents acting as downloaders
Rule name:Qbot
Create hunting rule
Author:Dhanunjaya
Description:Yara Rule to Detect Qbot
Rule name:SUSP_EnableContent_String_Gen
Create hunting rule
Author:Florian Roth
Description:Detects suspicious string that asks to enable active content in Office Doc
Reference:Internal Research
Rule name:SUSP_EnableContent_String_Gen_RID322C
Create hunting rule
Author:Florian Roth
Description:Detects suspicious string that asks to enable active content in Office Doc
Reference:Internal Research
Rule name:SUSP_Excel4Macro_AutoOpen
Create hunting rule
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.

Web download

SilentBuilder

Excel file xlsx 6b815375aaaaa7e540cba3c63239e027be255248ad6ee8599db14d9860061597

(this sample)

  
Delivery method
Distributed via web download
  
URLhaus
https://urlhaus.abuse.ch/url/1984650/
  
URLhaus
https://urlhaus.abuse.ch/url/1984576/
  
URLhaus
https://urlhaus.abuse.ch/url/1984528/
  
URLhaus
https://urlhaus.abuse.ch/url/1984456/
Cape
Cape
https://www.capesandbox.com/analysis/219942/
  
URLhaus
https://urlhaus.abuse.ch/url/1984512/

Comments


Avatar
zbet commented on 2022-01-17 22:07:50 UTC

url : hxxp://gzndfit.com/520/757459399_5/?i=1