MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 db5ef5ba06bfbe7f389d6e0c9a620b8338fbd94c0d226db3a9559a8851419bcb. 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: 10


Maldoc score: 5


Intelligence 10 IOCs YARA 12 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: db5ef5ba06bfbe7f389d6e0c9a620b8338fbd94c0d226db3a9559a8851419bcb
SHA3-384 hash: 51c4c3e36eb18c8a020da1252ddacd6eba4b3355c070f1c282ee2fa68c11788eb053ca1104f79099e0d7012a67f14713
SHA1 hash: 51ce3b61e2d8b56c9f77561742bc31e133da2192
MD5 hash: 6bfd9168fdbb84edce0ffb0208fed82a
humanhash: potato-quiet-oregon-pennsylvania
File name:SecuriteInfo.com.Heur.4905.32010
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:198'144 bytes
First seen:2021-03-10 01:33:49 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 6144:nKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgQ72/x0dmdw3RbsYUKZseUXC:F7G+m+hblUKZAS
TLSH 24149C1D369EA831CAA4373044D3B35EAF12EFE66B6E4646F50DB2311FB46911D0BD0A
Reporter SecuriteInfoCom
Tags:SilentBuilder

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
Application name is Microsoft Excel
Office document is in OLE format
OLE dump

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

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3186776 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
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)

Intelligence

File Origin
# of uploads :
1
# of downloads :
132
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
SecuriteInfo.com.Heur.4905.32010
Verdict:
Malicious activity
Analysis date:
2021-03-10 01:35:54 UTC
Tags:
macros ta505 loader
Link:
https://app.any.run/tasks/0ad88ead-e748-41fb-a121-404d9a370fcf

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Legit
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/123440/
Detection(s):
SecuriteInfo.com.Heur.4905.32010.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.QakySoWacky.M3.20210301.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Creating a file
Creating a process with a hidden window
Sending an HTTP GET request
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Office File
Link:
https://app.docguard.net/db5ef5ba06bfbe7f389d6e0c9a620b8338fbd94c0d226db3a9559a8851419bcb/results/dashboard
Payload URLs
URL
File name
http://www.iec.ch
WorkBook
Document image
Image:
Download PNG
Document image
Result
Verdict:
MALICIOUS
Details
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.
Result
Threat name:
Hidden Macro 4.0 Trickbot
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/633752
Signature
Allocates memory in foreign processes
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
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 abnormal large hidden Excel 4.0 Macro sheet
Found evasive API chain (trying to detect sleep duration tampering with parallel thread)
Found Excel 4.0 Macro with suspicious formulas
Found malware configuration
May check the online IP address of the machine
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office process drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect virtualization through RDTSC time measurements
Writes to foreign memory regions
Yara detected Trickbot
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 365849 Sample: SecuriteInfo.com.Heur.4905.32010 Startdate: 10/03/2021 Architecture: WINDOWS Score: 100 36 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->36 38 Found malware configuration 2->38 40 Antivirus detection for URL or domain 2->40 42 11 other signatures 2->42 8 EXCEL.EXE 84 41 2->8         started        process3 dnsIp4 34 digitizedental.co.uk 5.154.226.104, 49165, 80 GTSCEGTSCentralEuropeAntelGermanyCZ Romania 8->34 24 C:\Users\user\Sotre.logst, PE32 8->24 dropped 26 C:\Users\user\AppData\Local\...\10[1].iostem, PE32 8->26 dropped 48 Document exploit detected (process start blacklist hit) 8->48 50 Document exploit detected (UrlDownloadToFile) 8->50 13 rundll32.exe 8->13         started        file5 signatures6 process7 process8 15 rundll32.exe 13->15         started        signatures9 52 Writes to foreign memory regions 15->52 54 Allocates memory in foreign processes 15->54 18 wermgr.exe 4 2 15->18         started        22 cmd.exe 15->22         started        process10 dnsIp11 28 103.225.138.94, 449, 49168, 49171 DCNBSI-AS-APDCTVCableNetworkBroadbandServicesIncPH Philippines 18->28 30 187.20.217.129, 449, 49166, 49167 CLAROSABR Brazil 18->30 32 3 other IPs or domains 18->32 44 Tries to detect virtualization through RDTSC time measurements 18->44 46 Found evasive API chain (trying to detect sleep duration tampering with parallel thread) 18->46 signatures12
Gathering data
Threat name:
Win32.Trojan.Generic
Create hunting rule
Status:
Suspicious
First seen:
2021-03-10 01:34:13 UTC
AV detection:
3 of 45 (6.67%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=3npploqgx67h6oe5nygjuyqlqm4pxwkmburg3m5jkwniqukbtpfq._file
Result
Malware family:
trickbot
Create hunting rule
Score:
  10/10
Tags:
family:trickbot botnet:rob73 banker trojan
Link:
https://tria.ge/reports/210310-1c6fn7fw9x/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Looks up external IP address via web service
Loads dropped DLL
Templ.dll packer
Process spawned unexpected child process
Trickbot
Malware Config
C2 Extraction:
103.225.138.94:449
122.2.28.70:449
123.200.26.246:449
131.255.106.152:449
142.112.79.223:449
154.126.176.30:449
180.92.238.186:449
187.20.217.129:449
201.20.118.122:449
202.91.41.138:449
95.210.118.90:449
Dropper Extraction:
http://digitizedental.co.uk/apps/digi.php
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/db5ef5ba06bfbe7f389d6e0c9a620b8338fbd94c0d226db3a9559a8851419bcb

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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:Excel_Hidden_Macro_Sheet
Create hunting rule
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:multiple_concats_in_excel4_enjoy_the_silence
Create hunting rule
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats with register Function SILENT BUILDER EDITION
Reference:https://www.youtube.com/watch?v=2sd7MQVofYc
Rule name:multiple_concats_in_excel4_exec_enjoy_the_silence
Create hunting rule
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats with register Function SILENT BUILDER EDITION
Reference:https://blog.reversinglabs.com/blog/excel-4.0-macros
Rule name:multiple_concats_in_excel4_formula_exec_1
Create hunting rule
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats Inside of exec Function
Reference:https://blog.reversinglabs.com/blog/excel-4.0-macros
Rule name:multiple_concats_in_excel4_formula_register
Create hunting rule
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats Inside of register Function
Reference:https://blog.reversinglabs.com/blog/excel-4.0-macros
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:SUSP_Excel4Macro_AutoOpen
Create hunting rule
Author:John Lambert @JohnLaTwC
Description:Detects Excel4 macro use with auto open / close
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Cape
Cape
https://www.capesandbox.com/analysis/123440/

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