MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 72bc9f1cd24703393c011afc90cd4c7e689476c7ab43ac0f9787283e3fd6eb81. 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: 8


Maldoc score: 7


Intelligence 8 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 72bc9f1cd24703393c011afc90cd4c7e689476c7ab43ac0f9787283e3fd6eb81
SHA3-384 hash: e9bc1732241c82196d63161ffaa8605cb205c01e60b72e4a4a8edb8038f76468ed79ff36e6f20b4f54915eef9773af5b
SHA1 hash: 86a26969a52caa2a7e852a63a0cecbdc2b6af0ba
MD5 hash: 30e2b62d74449ffa3b01960d1300b5e7
humanhash: twelve-purple-apart-maryland
File name:SecuriteInfo.com.Exploit.Siggen3.10048.21627.26839
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:59'904 bytes
First seen:2021-02-17 20:55:25 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 1536:Oihz0DewjEXWfCDIM/V5xtezEsi8OUM+tfNaIZEpqpXouB:Oihz0DewjEXWfCDIM/V5xtezEsi8OUMI
TLSH 8A4317ABF7999C5AD905433940EB47E52333EC110B6B878B7688FB292FB52804F03597
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: 7
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
349677 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)
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
1
# of downloads :
102
Origin country :
n/a
Vendor Threat Intelligence
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/117605/
Detection(s):
SecuriteInfo.com.Exploit.Siggen3.10048.21627.26839.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.DLLREGISTERSERVER.200327.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.DLLREGISTERSERVER.200416.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4Macro.HiddenSheetDLWAKEUP.20200310.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.QakbotTheDuck.20200928.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4MagicPalmersArcade.20201207.UNOFFICIAL
Create hunting rule

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

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

TwinWave.EvilDoc.EvilDoc.Excel4EnjoyTheSilence.20210212.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XLSLOLBINHammerToFall.20201218.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
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/72bc9f1cd24703393c011afc90cd4c7e689476c7ab43ac0f9787283e3fd6eb81/results/dashboard
Document image
Image:
Download PNG
Document image
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 Trickbot
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/610848
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 evasive API chain (trying to detect sleep duration tampering with parallel thread)
Found Excel 4.0 Macro with suspicious formulas
Found malware configuration
Machine Learning detection for dropped file
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
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 hidden Macro 4.0 in Excel
Yara detected Trickbot
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 354443 Sample: SecuriteInfo.com.Exploit.Si... Startdate: 17/02/2021 Architecture: WINDOWS Score: 100 29 182.253.107.34 BIZNET-AS-APBIZNETNETWORKSID Indonesia 2->29 31 ident.me 2->31 47 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->47 49 Multi AV Scanner detection for domain / URL 2->49 51 Found malware configuration 2->51 53 14 other signatures 2->53 9 EXCEL.EXE 84 41 2->9         started        signatures3 process4 dnsIp5 39 psicheaurora.it 93.95.216.145, 49167, 80 SERVERPLAN-ASIT Italy 9->39 41 www.psicheaurora.it 9->41 25 C:\Users\user\Joret.fffooo, PE32 9->25 dropped 27 C:\Users\user\AppData\Local\...\10[1].crtf, PE32 9->27 dropped 59 Document exploit detected (process start blacklist hit) 9->59 61 Document exploit detected (UrlDownloadToFile) 9->61 14 rundll32.exe 9->14         started        file6 signatures7 process8 process9 16 rundll32.exe 14->16         started        signatures10 43 Writes to foreign memory regions 16->43 45 Allocates memory in foreign processes 16->45 19 wermgr.exe 16->19         started        22 wermgr.exe 4 2 16->22         started        process11 dnsIp12 55 Tries to detect virtualization through RDTSC time measurements 19->55 57 Found evasive API chain (trying to detect sleep duration tampering with parallel thread) 19->57 33 108.170.20.75, 443 SSASN2US United States 22->33 35 94.140.114.136, 443 NANO-ASLV Latvia 22->35 37 3 other IPs or domains 22->37 signatures13
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/72bc9f1cd24703393c011afc90cd4c7e689476c7ab43ac0f9787283e3fd6eb81/
Threat name:
Document-Word.Downloader.EncDoc
Create hunting rule
Status:
Malicious
First seen:
2021-02-17 20:56:11 UTC
AV detection:
17 of 46 (36.96%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=ok6j6hgsi4btspabdl6jbtkmpzuji5whvnb2yd4xq4ud4p6w5oaq._file
Result
Malware family:
trickbot
Create hunting rule
Score:
  10/10
Tags:
family:trickbot botnet:rob57 banker macro trojan xlm
Link:
https://tria.ge/reports/210217-2tz192lehn/
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:
194.5.249.156:443
142.202.191.164:443
193.8.194.96:443
45.155.173.242:443
108.170.20.75:443
185.163.45.138:443
94.140.114.136:443
134.119.186.202:443
200.52.147.93:443
45.230.244.20:443
186.250.157.116:443
186.137.85.76:443
36.94.62.207:443
182.253.107.34:443
Dropper Extraction:
http://www.psicheaurora.it/fanta/download.php
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
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: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: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_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.

Cape
Cape
https://www.capesandbox.com/analysis/117605/

Comments