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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5de9a2fb4b9a65e5b48d78ed6a09e6cbdca07d30e917b5777be56d7c2e7acc0e. 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: 9


Maldoc score: 3


Intelligence 9 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 5de9a2fb4b9a65e5b48d78ed6a09e6cbdca07d30e917b5777be56d7c2e7acc0e
SHA3-384 hash: 009d4d7808756e99e8625ec2eb6b88a8fb1e7bbaf9e38175c82219251be99460a72873802ef9e541463c5d0671443747
SHA1 hash: f5997183101be768c68d53f078ad4a192201a0eb
MD5 hash: 25c49a2d3df43e919df3dbd27cd07745
humanhash: romeo-twelve-august-bluebird
File name:NewRegulations.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:146'432 bytes
First seen:2021-12-16 16:13:28 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 1536:cxYdYLLjWqBpZRP9yAVSBK4vEf4CAuDScpMP:cxYWLRPhgK4vYJ5C
TLSH T1A5E305F4A354CAE9CB62E9758DCF2F905699CE46895DAFC32D1C2029BB24378CC4E0D5
Reporter 604Kuzushi
Tags:SilentBuilder 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: 3
OLE dump

MalwareBazaar was able to identify 4 sections in this file using oledump:

Section IDSection sizeSection name
1114 bytesCompObj
2280 bytesDocumentSummaryInformation
3232 bytesSummaryInformation
4141554 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_CloseRuns when the Excel Workbook is closed
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
1
# of downloads :
210
Origin country :
n/a
Vendor Threat Intelligence
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/214632/
Detection(s):
TwinWave.EvilDoc.DridexArterial.20211208.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DridexUManiac.20211215.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DridexUManiac.M2.20211215.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Creating a file
Launching a process
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/5de9a2fb4b9a65e5b48d78ed6a09e6cbdca07d30e917b5777be56d7c2e7acc0e/results/dashboard
Verdict:
Malicious
Threat level:
  10/10
Confidence:
67%
Tags:
macros macros-on-close macros-on-open stripped wscript
Link:
https://www.filescan.io/uploads/61bb65ce8541392eb4eac9e1/reports/8e8bf3b0-bb46-42a2-b110-2b2676fde4b5/overview
Result
Threat name:
Hidden Macro 4.0 Dridex Downloader
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/908638
Signature
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Contains functionality to create processes via WMI
Creates processes via WMI
Document exploit detected (creates forbidden files)
Document exploit detected (process start blacklist hit)
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Microsoft Office drops suspicious files
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Potential malicious VBS script found (has network functionality)
Sigma detected: Regsvr32 Command Line Without DLL
Sigma detected: WScript or CScript Dropper
System process connects to network (likely due to code injection or exploit)
Tries to delay execution (extensive OutputDebugStringW loop)
Yara detected Dridex Downloader
Yara detected Dridex unpacked file
Yara detected hidden Macro 4.0 in Excel
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 541116 Sample: NewRegulations.xls Startdate: 16/12/2021 Architecture: WINDOWS Score: 100 36 89.31.56.58 UNITHOST-ASNL Netherlands 2->36 38 51.159.52.196 OnlineSASFR France 2->38 40 2 other IPs or domains 2->40 44 Found malware configuration 2->44 46 Found malicious Excel 4.0 Macro 2->46 48 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->48 50 10 other signatures 2->50 8 EXCEL.EXE 8 8 2->8         started        12 explorer.exe 2 2->12         started        14 regsvr32.exe 2->14         started        signatures3 process4 file5 32 C:\Users\user\Desktop32ewRegulations.xls, Composite 8->32 dropped 34 C:\ProgramData\rwohRzcEZRNwwXdPkX.vbs, ASCII 8->34 dropped 58 Document exploit detected (creates forbidden files) 8->58 60 Microsoft Office drops suspicious files 8->60 16 explorer.exe 8->16         started        18 wscript.exe 4 11 12->18         started        23 regsvr32.exe 14->23         started        signatures6 process7 dnsIp8 42 cdn.discordapp.com 162.159.129.233, 443, 49165 CLOUDFLARENETUS United States 18->42 28 C:\Users\...\FgrHlNXpNLZchristmasnigga[1].bin, PE32 18->28 dropped 30 C:\ProgramData\bnigger.bin, PE32 18->30 dropped 52 System process connects to network (likely due to code injection or exploit) 18->52 54 Benign windows process drops PE files 18->54 25 WMIC.exe 18->25         started        56 Tries to delay execution (extensive OutputDebugStringW loop) 23->56 file9 signatures10 process11 signatures12 62 Creates processes via WMI 25->62
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/5de9a2fb4b9a65e5b48d78ed6a09e6cbdca07d30e917b5777be56d7c2e7acc0e/
Threat name:
Document-Office.Trojan.Abracadabra
Create hunting rule
Status:
Malicious
First seen:
2021-12-16 16:14:11 UTC
File Type:
Document
Extracted files:
7
AV detection:
9 of 43 (20.93%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=lxu2f62ltjs6lnenpdwwucpgzpoka7jq5el3k5334vwxylt2zqha._file
Result
Malware family:
dridex
Create hunting rule
Score:
  10/10
Tags:
family:dridex botnet:22201 botnet loader macro xlm
Link:
https://tria.ge/reports/211216-tpmzgadbcp/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Process spawned suspicious child process
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Dridex Loader
Dridex
Process spawned unexpected child process
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/5de9a2fb4b9a65e5b48d78ed6a09e6cbdca07d30e917b5777be56d7c2e7acc0e

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:BitcoinAddress
Create hunting rule
Author:Didier Stevens (@DidierStevens)
Description:Contains a valid Bitcoin address
Rule name:Excel_Hidden_Macro_Sheet
Create hunting rule
Rule name:Excel_Hidden_Macro_Sheet
Create hunting rule
Rule name:INDICATOR_OLE_Excel4Macros_DL2
Create hunting rule
Author:ditekSHen
Description:Detects OLE Excel 4 Macros documents acting as downloaders
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.

Malspam

SilentBuilder

Excel file xls 5de9a2fb4b9a65e5b48d78ed6a09e6cbdca07d30e917b5777be56d7c2e7acc0e

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/214632/

Comments