MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 7183300485dd480c05627eb5733ddb2bc18c3b5ce4930e6cc8ac2e0f3f06eb72. 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: 7183300485dd480c05627eb5733ddb2bc18c3b5ce4930e6cc8ac2e0f3f06eb72
SHA3-384 hash: d6e58c67f783f563dd89eace9d20de6a8e7070c9028664b61e69ea47021c53ec9b5a4cb4a91f67da8b7f34a6538f304d
SHA1 hash: a2534c78030366f9dee59ed5223b745667d326a6
MD5 hash: 4b8910dcc62cb3b626085bc7565de593
humanhash: ten-batman-enemy-uncle
File name:Confirm-882992811-7271422175.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:198'144 bytes
First seen:2021-03-09 19:39:12 UTC
Last seen:2021-03-09 21:35:37 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:nKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgQ72/x0dmdw3RbsYUKZseUXc:F7G+m+hblUKZAs
TLSH 36149C1D369EA831CAA4333044D3B35EAF12EFE66B6E4646F50DB2311FB56911D0BD0A
Reporter p5yb34m
Tags:rob73 SilentBuilder TrickBot xls


Avatar
p5yb34m
.dll Payload:
http://digitizedental.co.uk/apps/digi.php
http://digitizedental.co.uk/apps/download.iostem

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 :
2
# of downloads :
1'030
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Confirm.xls
Verdict:
Malicious activity
Analysis date:
2021-03-09 19:14:59 UTC
Tags:
macros ta505 opendir
Link:
https://app.any.run/tasks/f49f666a-acb8-4a8e-8ad2-541490a1878b

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/123373/
Detection(s):
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/7183300485dd480c05627eb5733ddb2bc18c3b5ce4930e6cc8ac2e0f3f06eb72/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/633476
Signature
Allocates memory in foreign processes
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
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 dnsIp2 2 Behavior Graph ID: 365707 Sample: Confirm-882992811-7271422175.xls Startdate: 09/03/2021 Architecture: WINDOWS Score: 100 29 22.2.28.70 MICROSOFT-CORP-MSN-AS-BLOCKUS United States 2->29 31 78.52.17.84.zen.spamhaus.org 2->31 33 78.52.17.84.cbl.abuseat.org 2->33 45 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->45 47 Found malware configuration 2->47 49 Document exploit detected (drops PE files) 2->49 51 9 other signatures 2->51 9 EXCEL.EXE 84 41 2->9         started        signatures3 process4 dnsIp5 39 digitizedental.co.uk 5.154.226.104, 49165, 80 GTSCEGTSCentralEuropeAntelGermanyCZ Romania 9->39 25 C:\Users\user\Sotre.logst, PE32 9->25 dropped 27 C:\Users\user\AppData\Local\...\8[1].iostem, PE32 9->27 dropped 57 Document exploit detected (process start blacklist hit) 9->57 59 Document exploit detected (UrlDownloadToFile) 9->59 14 rundll32.exe 9->14         started        file6 signatures7 process8 process9 16 rundll32.exe 14->16         started        signatures10 41 Writes to foreign memory regions 16->41 43 Allocates memory in foreign processes 16->43 19 wermgr.exe 4 2 16->19         started        23 cmd.exe 16->23         started        process11 dnsIp12 35 122.2.28.70, 449, 49166, 49169 IPG-AS-APPhilippineLongDistanceTelephoneCompanyPH Philippines 19->35 37 api.ip.sb 19->37 53 Tries to detect virtualization through RDTSC time measurements 19->53 55 Found evasive API chain (trying to detect sleep duration tampering with parallel thread) 19->55 signatures13
Gathering data
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ogbtabef3veayblcp22xgpo3fpayyo244sjq43givqxa6pyg5nza._file
Result
Malware family:
trickbot
Create hunting rule
Score:
  10/10
Tags:
family:trickbot botnet:rob73 banker trojan
Link:
https://tria.ge/reports/210309-zxyr1gfbfn/
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/7183300485dd480c05627eb5733ddb2bc18c3b5ce4930e6cc8ac2e0f3f06eb72

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.

Malspam

SilentBuilder

Excel file xls 7183300485dd480c05627eb5733ddb2bc18c3b5ce4930e6cc8ac2e0f3f06eb72

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/123373/

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