MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 9050396227d5aa1fab746a29861ad3c25be2bcf4a7edaa97d67b6f4e24666b3f. 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: 7


Maldoc score: 7


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

SHA256 hash: 9050396227d5aa1fab746a29861ad3c25be2bcf4a7edaa97d67b6f4e24666b3f
SHA3-384 hash: 46378cf29788a3b7fb908bced306eb45df9b9fad2344a453d888983d02d36bc6a091813e47bf194f3275525be6cb882a
SHA1 hash: 238dd183fb490abaeb7629865d80b249b2b79c31
MD5 hash: 6c2ed51eb9e7160b9ab6a6a9ae8fdc1b
humanhash: tennis-bakerloo-massachusetts-nevada
File name:DocuSign_198836422_1059763935.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:168'960 bytes
First seen:2021-02-17 15:02:03 UTC
Last seen:2021-02-17 17:23:00 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:bScKoSsxzNDZLDZjlbR868O8KlVH3jiKq7uDphYHceXVhca+fMHLtyeGxcl8OUM0:OcKoSsxzNDZLDZjlbR868O8KlVH3jiKR
TLSH B5F3D05E7659DC12DA48033454E38BA36317FC9AEBB387867A0CF6262FB07D05E1A507
Reporter cocaman
Tags:SilentBuilder xls


Avatar
cocaman
Malicious email (T1566.001)
From: "Lease Consultants <mnsamad@technolight-ksa.com>" (likely spoofed)
Received: "from smtp83.ord1d.emailsrvr.com (smtp83.ord1d.emailsrvr.com [184.106.54.83]) "
Date: "Wed, 17 Feb 2021 14:55:07 +0000"
Subject: "DocuSign: Equipment # 27484"
Attachment: "DocuSign_198836422_1059763935.xls"

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
3157906 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
SuspiciousFORMULA.FILLMay modify Excel 4 Macro formulas at runtime
SuspiciousEXECMay run an executable file or a system
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
2
# of downloads :
145
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
True
Detection(s):
TwinWave.EvilDoc.Excel4MagicPalmersArcade.20201207.UNOFFICIAL
Create hunting rule

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

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Creating a process with a hidden window
Connection attempt by exploiting the app vulnerability
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Office File
Link:
https://app.docguard.net/9050396227d5aa1fab746a29861ad3c25be2bcf4a7edaa97d67b6f4e24666b3f/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/610465
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 evasive API chain (trying to detect sleep duration tampering with parallel thread)
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Machine Learning detection for dropped file
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
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: 354252 Sample: DocuSign_198836422_1059763935.xls Startdate: 17/02/2021 Architecture: WINDOWS Score: 100 27 5.234.72.84 TCIIR Iran (ISLAMIC Republic Of) 2->27 29 4.119.186.200 LEVEL3US United States 2->29 31 6 other IPs or domains 2->31 45 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->45 47 Found malware configuration 2->47 49 Multi AV Scanner detection for dropped file 2->49 51 10 other signatures 2->51 9 EXCEL.EXE 88 45 2->9         started        signatures3 process4 dnsIp5 39 destinostumundo.com 98.142.109.186, 443, 49167, 49168 DIMENOCUS United States 9->39 23 C:\Users\user\HGrt.foste, PE32 9->23 dropped 25 C:\Users\user\AppData\Local\...\10[1].xxls, PE32 9->25 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 16->19         started        process11 dnsIp12 33 94.158.245.54, 443 MIVOCLOUDMD Moldova Republic of 19->33 35 45.14.226.115, 443 SPECTRAIPSpectraIPBVNL Netherlands 19->35 37 2 other IPs or domains 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
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/9050396227d5aa1fab746a29861ad3c25be2bcf4a7edaa97d67b6f4e24666b3f/
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=sbidsyrh2wvb7k3uniuymgwtyjn6fphuu7w2vf6wpnxu4jdgnm7q._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
macro xlm
Link:
https://tria.ge/reports/210217-g9djrj8ars/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Process spawned unexpected child process
Malware Config
Dropper Extraction:
http://destinostumundo.com/layout/recruter.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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
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: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 9050396227d5aa1fab746a29861ad3c25be2bcf4a7edaa97d67b6f4e24666b3f

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments