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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 fe73fd3955380212aaecb045e92353f9684af4e89e4d1c183dd84a0b7271230b. 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: 3


Intelligence 8 IOCs YARA 1 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: fe73fd3955380212aaecb045e92353f9684af4e89e4d1c183dd84a0b7271230b
SHA3-384 hash: b418c453cee94cb6fb6154161bf6908ae3b723d5b2c42d00664d005b0b3bf96751cd67390aa1b2fcc1b0170bd04be392
SHA1 hash: 8df3093cfe00a49a1f86db5a4d6263a29ff30980
MD5 hash: 764987da4271d3dd9d7d9f8f78c897e5
humanhash: don-stairway-utah-mobile
File name:diagram_1318555547.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:269'312 bytes
First seen:2021-10-07 22:42:20 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:mKpb8rGYrMPe3q7Q0XV5xtuE8vG8UM+Onfb7I6+tqDWcwnoRZzlj+oSGpGvhmmmk:Gj7CqScwoRZ9bSXkh/nLKH
TLSH T18A44D02636A5A41DEC2D2B76A8BB53D02337FC504FD38BC73AA772263F726914D26405
Reporter PO3T1985
Tags:SilentBuilder SQUIRRELWAFFLE xls


Avatar
PO3T1985
Spearphishing E-Mail with "inert" URL dropping zipped xls. Previous campaings using this method: Qbot, Emotet/Trickbot.
Messages include legit communication exfiltrated in past attacks.

Hidden sheets.
Drops Cobalt Strike.

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 3 sections in this file using oledump:

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3257152 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
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
1
# of downloads :
303
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
fe73fd3955380212aaecb045e92353f9684af4e89e4d1c183dd84a0b7271230b.xls
Verdict:
Malicious activity
Analysis date:
2021-10-08 00:22:44 UTC
Tags:
macros
Link:
https://app.any.run/tasks/bef51f6a-1a5d-4557-b277-aef7f676f0f8

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/195973/
Detection(s):
TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.DLLREGISTERSERVER.200416.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.RUNDLL32.EXE.200327.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.RUNDLL32.EXE.200416.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.SHELLEXECUTE.200524.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.URLDOWNLOADTOFILE.200415.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4MStringFractures.20210921.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20210611.UNOFFICIAL
Create hunting rule

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

Xls.Downloader.SquirrelWaffle20921-9895790-0
Create hunting rule

Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/fe73fd3955380212aaecb045e92353f9684af4e89e4d1c183dd84a0b7271230b/results/dashboard
Payload URLs
URL
File name
https://cortinastelasytrazos.com/Yro6Atvj/sec.html
WorkBook
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
macros macros-on-open
Link:
https://www.filescan.io/uploads/615f77f8e3d213d202ba853f/reports/1698ef67-366e-4ad1-8a93-3f0e255695ea/overview
Result
Threat name:
Unknown
Detection:
malicious
Classification:
expl
Score:
68 / 100
Link:
https://www.joesandbox.com/analysis/866729
Signature
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Multi AV Scanner detection for domain / URL
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/fe73fd3955380212aaecb045e92353f9684af4e89e4d1c183dd84a0b7271230b/
Threat name:
Document-Excel.Downloader.EncDoc
Create hunting rule
Status:
Malicious
First seen:
2021-10-07 22:43:04 UTC
AV detection:
20 of 28 (71.43%)
Threat level:
  3/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=7zz72okvhabbfkxmwbc6si2t7fuev5hitzgrygb53bfaw4tremfq._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
n/a
Link:
https://tria.ge/reports/211007-2m8r6ache7/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Process spawned unexpected child process
Malware Config
Dropper Extraction:
https://cortinastelasytrazos.com/Yro6Atvj/sec.html
https://orquideavallenata.com/4jmDb0s9sg/sec.html
https://fundacionverdaderosheroes.com/gY0Op5Jkht/sec.html
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/fe73fd395538/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Malicious File
Score:
0.94
Link:
https://yomi.yoroi.company/submissions/fe73fd3955380212aaecb045e92353f9684af4e89e4d1c183dd84a0b7271230b

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: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.

anyrun
any.run
https://app.any.run/tasks/5129c5fa-73d8-4625-abbd-5751a8e31a86
Joe
Joe Sandbox
https://www.joesandbox.com/analysis/499147/0/html
  
Link
https://www.zscaler.com/blogs/security-research/squirrelwaffle-new-loader-delivering-cobalt-strike
  
Dropping
Cobalt Strike
  
Delivery method
Distributed via e-mail link
Cape
Cape
https://www.capesandbox.com/analysis/195973/

Comments