MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 a97f8353042df6d88190ea7755f48fe75d44ae39631ef353ba7a608f8ab4401a. 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


Maldoc score: 5


Intelligence 6 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: a97f8353042df6d88190ea7755f48fe75d44ae39631ef353ba7a608f8ab4401a
SHA3-384 hash: b7f501a230bb8378a3d56b9a6e7ef4dec361e68cf37c27f8bfaed27511d83df3676c2760cf360ba0ba24150d6dffd49b
SHA1 hash: 10a7c3181211c92e56144884890852d7c74c369f
MD5 hash: 0bc486eb85d40ce0aff3d5458f0ac8b7
humanhash: alabama-finch-georgia-football
File name:document-1654445132.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:338'944 bytes
First seen:2020-11-27 15:38:35 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:scKoSsxzNDZLDZjlbR868O8Kfc03pb0q7uDphYHceXVhca+fMHLty/x2zZ8kpTIx:q67Q8R/c4JufbSPDRY/p
TLSH 2A74F1C6B3CACAC5D629433445C78BE61B1BEC45A7760BCB6F81B71ABF351905EC2242
Reporter lazyactivist192
Tags:Qakbot qbot SilentBuilder tr02 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: 5
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
3326338 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
SuspiciousRUNMay run an executable file or a system command
SuspiciousEXECMay run an executable file or a system

Intelligence

File Origin
# of uploads :
1
# of downloads :
72
Origin country :
n/a
Vendor Threat Intelligence
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Creating a process with a hidden window
Sending a custom TCP request by exploiting the app vulnerability
Launching a process by exploiting the app vulnerability
Result
Verdict:
MALICIOUS
Details
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/a97f8353042df6d88190ea7755f48fe75d44ae39631ef353ba7a608f8ab4401a/
Threat name:
Script-Macro.Trojan.Silentbuilder
Create hunting rule
Status:
Malicious
First seen:
2020-11-27 15:39:07 UTC
AV detection:
17 of 29 (58.62%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=vf7yguyefx3nramq5j3vl5ep45oujlrzmmppgu52pjqi7cvuiana._file
Result
Malware family:
n/a
Score:
  10/10
Tags:
macro
Link:
https://tria.ge/reports/201127-vgxflkgmxa/
Behaviour
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates system info in registry
Modifies Internet Explorer settings
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/a97f8353042df6d88190ea7755f48fe75d44ae39631ef353ba7a608f8ab4401a

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:QakBot
Create hunting rule
Author:kevoreilly
Description:QakBot Payload
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.

Comments