MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 d61e90fe268528db7a0eee66f064270a519b2843a59642923b137ec2b81fe5e2. 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: 6


Intelligence 6 IOCs YARA 11 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: d61e90fe268528db7a0eee66f064270a519b2843a59642923b137ec2b81fe5e2
SHA3-384 hash: 866e9ccad4a208d0a02d2db5aabcd8f2e0a4973cf3c630472201c6fb686b473f71e628f6d9ee25b67b34dff58494402f
SHA1 hash: 39a056a263368dcb1fb98a2226eae7c9d1488453
MD5 hash: afdab90737c55a669e7025df2fa86efe
humanhash: winner-finch-fanta-don
File name:afdab907_by_Libranalysis
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:375'808 bytes
First seen:2021-05-12 13:02:45 UTC
Last seen:2021-05-12 14:20:10 UTC
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 3072:Q8UGHv2tt/BI/s/C/i/R/7/3/UQ/OhP/2/a/1/I/T/tbHm7H9G4l+s2k3zN4sbc5:vUGAt6Uqa5DPdG9uS9QLp4l+s+E8
TLSH 348454857526483BE6164F73B0EE4DEC5BB2ED60960F4A8B3E5AF30C9F71340A513686
Reporter Libranalysis
Tags:SilentBuilder


Avatar
Libranalysis
Uploaded as part of the sample sharing project

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
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
3363283 bytesBook

Intelligence

File Origin
# of uploads :
2
# of downloads :
126
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Legit
File type:
application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Has a screenshot:
False
Contains macros:
False
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/155333/
Detection(s):
TwinWave.EvilDoc.Excel4MacroLuresWatchingTheDectives.20210115.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.QakySoWacky.M2.20210218.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4MQakyEsqHomeComing.20210423.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malicious
File Type:
Legacy Office File
Link:
https://app.docguard.net/d61e90fe268528db7a0eee66f064270a519b2843a59642923b137ec2b81fe5e2/results/dashboard
Payload URLs
URL
File name
xlfn.AGGREGATE
Book
Result
Verdict:
SUSPICIOUS
Link:
https://labs.inquest.net/dfi/sha256/d61e90fe268528db7a0eee66f064270a519b2843a59642923b137ec2b81fe5e2
Result
Threat name:
Hidden Macro 4.0
Create hunting rule
Detection:
malicious
Classification:
expl.evad
Score:
68 / 100
Link:
https://www.joesandbox.com/analysis/779899
Signature
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Found abnormal large hidden Excel 4.0 Macro sheet
Found Excel 4.0 Macro with suspicious formulas
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Sigma detected: Microsoft Office Product Spawning Windows Shell
Behaviour
Behavior Graph:
Download SVG
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/d61e90fe268528db7a0eee66f064270a519b2843a59642923b137ec2b81fe5e2/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=2ypjb7rgquunw6qo5ztpazbhbjizwkcduwlefer3cn7mfoa74xra._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
n/a
Link:
https://tria.ge/reports/210512-gb8mgavmje/
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:
https://signifysystem.com/ceg7AX7oN0o/ue.html
https://fcventasyservicios.cl/k60jvjcT/ue.html
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/d61e90fe268528db7a0eee66f064270a519b2843a59642923b137ec2b81fe5e2

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:crime_win32_ransom_avaddon_1
Create hunting rule
Author:@VK_Intel
Description:Detects Avaddon ransomware
Reference:https://twitter.com/VK_Intel/status/1300944441390370819
Rule name:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
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:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
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:Ping_Del_method_bin_mem
Create hunting rule
Author:James_inthe_box
Description:cmd ping IP nul del
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:silentbuilder_03_11
Create hunting rule
Author:James Quinn
Description:SilentBuilder xls sheets
Rule name:silentbuilder_03_17
Create hunting rule
Author:James Quinn
Description:SilentBuilder xls sheets
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.

Cape
Cape
https://www.capesandbox.com/analysis/155333/

Comments