MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5f8f808e711e11c8c1230bbd5e25a51a195ccf4df4991551f6949eff5766d66b. 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: 11


Maldoc score: 5


Intelligence 11 IOCs YARA 2 File information Comments

SHA256 hash: 5f8f808e711e11c8c1230bbd5e25a51a195ccf4df4991551f6949eff5766d66b
SHA3-384 hash: 33c2030d018168c1c6636ee7d183be434b758b277901810a88b53d68e759ca5ba6b2b2006e77da93a9397aec62fafdb3
SHA1 hash: 211314f83602aa396a66e061f513447c44260c0a
MD5 hash: 853a034bc06912399db11635959f88c3
humanhash: item-mockingbird-video-mobile
File name:tmpj8ia13ag
Download: download sample
Signature SilentBuilder
File size:93'034 bytes
First seen:2022-01-28 20:31:32 UTC
Last seen:2022-02-01 05:09:26 UTC
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 1536:u8rk3hbdlylKsgqopeJBWhZFGkE+cL2NdAE6yHBEL70drpFk0GX/s2C6ORQYDBhQ:ugk3hbdlylKsgqopeJBWhZFGkE+cL2N8
TLSH T1F3934B1BA98548C5E66D47F4E0625AE9BE63EF45FB433ED321107F863AB41834C0B17A
Reporter Cryptolaemus1
Tags:Emotet epoch4 SilentBuilder xlsx

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
OLE dump

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

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
381698 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
IOC91.240.118.172IPv4 address
IOCCMD.EXEExecutable file name
SuspiciousEXECMay run an executable file or a system
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence


File Origin
# of uploads :
3
# of downloads :
114
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
tmpj8ia13ag
Verdict:
Malicious activity
Analysis date:
2022-01-28 20:36:33 UTC
Tags:
macros macros40 emotet-doc emotet loader

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

Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Creating a process with a hidden window
Launching a process
Sending a custom TCP request
Sending an HTTP GET request
Creating a file
Running batch commands
Moving a recently created file
Running batch commands by exploiting the app vulnerability
Sending an HTTP GET request to an infection source
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Payload URLs
URL
File name
http://91.240.118.172/cc/vv/fe.html
LINKO
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
cmd cmd.exe macros macros-on-open mshta mshta.exe stripped
Label:
Malicious
Suspicious Score:
5.5/10
Score Malicious:
55%
Score Benign:
45%
Result
Verdict:
MALICIOUS
Details
Excel 4.0 Macro
Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.
IPv4 Dotted Quad URL
A URL was detected referencing a direct IP address, as opposed to a domain name.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
MSHTA Pivot
Macro may contain a pivot to an external URL resource via MSHTA.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Document With No Content
Document contains little or no semantic information.
Threat name:
Document-Excel.Trojan.Heuristic
Status:
Malicious
First seen:
2022-01-28 20:32:08 UTC
File Type:
Document
Extracted files:
8
AV detection:
6 of 43 (13.95%)
Threat level:
  2/5
Gathering data
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: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.

Comments