MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3afbf890873d196a76b7e797075807770ae9c5250f231cdfead1b4733cdf7880. 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: 10


Maldoc score: 7


Intelligence 10 IOCs YARA 3 File information Comments

SHA256 hash: 3afbf890873d196a76b7e797075807770ae9c5250f231cdfead1b4733cdf7880
SHA3-384 hash: 38875d088ddd700bc8750c95086b97e211c1c917f28b12dec9edf719e97bdd243d54c17afd65cb39e7b57c52b10ac131
SHA1 hash: 639d54428888aadc02df369eb580695c0086c305
MD5 hash: 433898ae416d33bdd6061029ff65cedf
humanhash: hydrogen-north-vermont-uniform
File name:tr.xls
Download: download sample
Signature SilentBuilder
File size:132'608 bytes
First seen:2021-11-30 11:26:01 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:LKpb8rGYrMPe3q7Q0XV5xtezEsi8/dgRJyVceeiE/RzPQUu/zLOQT:LKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgzc
TLSH T1FCD34A52B65A844EF216C73814E74370A2A2ED31DB5E46C365E7BB223FBCDE05933852
Reporter ankit_anubhav
Tags:SilentBuilder tr 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
OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3121786 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
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence


File Origin
# of uploads :
1
# of downloads :
169
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
tr.xls
Verdict:
Malicious activity
Analysis date:
2021-11-30 11:28:55 UTC
Tags:
macros

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
False
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Sending a custom TCP request
Searching for synchronization primitives
Creating a window
Сreating synchronization primitives
Sending an HTTP GET request
Sending a custom TCP request by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
macros macros-on-open regsvr32 stripped
Result
Threat name:
Hidden Macro 4.0
Detection:
malicious
Classification:
expl
Score:
72 / 100
Signature
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Multi AV Scanner detection for submitted file
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
Yara detected hidden Macro 4.0 in Excel
Behaviour
Behavior Graph:
Threat name:
Document-Excel.Trojan.Nastya
Status:
Malicious
First seen:
2021-11-30 11:26:11 UTC
File Type:
Document
Extracted files:
14
AV detection:
15 of 44 (34.09%)
Threat level:
  5/5
Result
Malware family:
n/a
Score:
  10/10
Tags:
n/a
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Process spawned unexpected child process
Malware Config
Dropper Extraction:
https://greenflag.esp.br/yuINdRbM/tiynh.html
https://noithat117.vn/TSh7GBeIR/tiynh.html
https://playsis.com.br/qJSL1BN5V/tiynh.html
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:Excel_Hidden_Macro_Sheet
Rule name:Excel_Hidden_Macro_Sheet
Rule name:SUSP_Excel4Macro_AutoOpen
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.

  
Delivery method
Distributed via e-mail link

Comments