MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 8fbf1590771243d6acff1df44382a63b7cd5ef14c0c3d0e0b52129b415058115. 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: 8fbf1590771243d6acff1df44382a63b7cd5ef14c0c3d0e0b52129b415058115
SHA3-384 hash: 99243ae26e88e0e345f4a0c21c3693b6f607f97be7ec99225e84062f3e85b9429707032dc8b8804d5fb1cd465da159bf
SHA1 hash: 0afab595bfc2ea557743caa482684451beb7ef8c
MD5 hash: 8bc72461a962bf7ca0df4c69f3b3f16b
humanhash: finch-undress-idaho-mississippi
File name:SecuriteInfo.com.Exploit.Siggen3.10048.3997.16392
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:59'904 bytes
First seen:2021-02-17 20:55:23 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 1536:Oihz0DewjEXWfCDIM/V5xtezEsi8OUM+tfNaIZEpqpXouX:Oihz0DewjEXWfCDIM/V5xtezEsi8OUM+
TLSH 154317ABF7999C5AD905433940EB47E52333EC110B6B878B7688FB296FB52804F03597
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 :
104
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/117604/
Detection(s):
SecuriteInfo.com.Exploit.Siggen3.10048.3997.16392.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/8fbf1590771243d6acff1df44382a63b7cd5ef14c0c3d0e0b52129b415058115/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.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/610852
Signature
Allocates memory in foreign processes
Antivirus detection for URL or domain
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
Hijacks the control flow in another process
Machine Learning detection for dropped file
May check the online IP address of the machine
Multi AV Scanner detection for dropped 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
Sigma detected: Suspicious Svchost Process
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Writes to foreign memory regions
Yara detected hidden Macro 4.0 in Excel
Yara detected Trickbot
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 354444 Sample: SecuriteInfo.com.Exploit.Si... Startdate: 17/02/2021 Architecture: WINDOWS Score: 100 45 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->45 47 Found malware configuration 2->47 49 Antivirus detection for URL or domain 2->49 51 13 other signatures 2->51 9 EXCEL.EXE 84 39 2->9         started        14 taskeng.exe 1 2->14         started        process3 dnsIp4 41 www.psicheaurora.it 9->41 43 psicheaurora.it 93.95.216.145, 49165, 80 SERVERPLAN-ASIT Italy 9->43 31 C:\Users\user\Joret.fffooo, PE32 9->31 dropped 33 C:\Users\user\AppData\Local\...\8[1].crtf, PE32 9->33 dropped 67 Document exploit detected (process start blacklist hit) 9->67 69 Document exploit detected (UrlDownloadToFile) 9->69 16 rundll32.exe 9->16         started        18 rundll32.exe 14->18         started        file5 signatures6 process7 process8 20 rundll32.exe 16->20         started        signatures9 53 Writes to foreign memory regions 20->53 55 Allocates memory in foreign processes 20->55 23 wermgr.exe 4 6 20->23         started        27 wermgr.exe 20->27         started        process10 dnsIp11 35 185.109.54.99, 447, 49173 OT-ASRO Ukraine 23->35 37 193.8.194.96, 443, 49170, 49172 FIBERHUBUS United Kingdom 23->37 39 8 other IPs or domains 23->39 57 Hijacks the control flow in another process 23->57 59 Tries to harvest and steal browser information (history, passwords, etc) 23->59 61 Writes to foreign memory regions 23->61 29 svchost.exe 23->29         started        63 Tries to detect virtualization through RDTSC time measurements 27->63 65 Found evasive API chain (trying to detect sleep duration tampering with parallel thread) 27->65 signatures12 process13
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/8fbf1590771243d6acff1df44382a63b7cd5ef14c0c3d0e0b52129b415058115/
Threat name:
Document-Word.Downloader.EncDoc
Create hunting rule
Status:
Malicious
First seen:
2021-02-17 20:56:11 UTC
AV detection:
16 of 48 (33.33%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=r67rledxcjb5nlh7dx2ehavghn6nl3yuydb5byfveeu3ififqekq._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/210217-9a68m1nxlx/
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 FindShellTrayWindow
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/117604/

Comments