MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 3f3f8fdbbededb44bd91400f0128e43fb071d1646871f46c6589af7370b6c9dd. 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

ZLoader

Vendor detections: 7

Maldoc score: 3

Intelligence 7 IOCs YARA 9 File information Comments

SHA256 hash:	3f3f8fdbbededb44bd91400f0128e43fb071d1646871f46c6589af7370b6c9dd
SHA3-384 hash:	f903dc147b73084163771197ee815b2bdd466cfbd7e6e494ef6dc1c32ac9b1e416a00e82251bc1950ca6c86969ad4313
SHA1 hash:	bf8220c8338aedd6ccebb735c12c20e9992e2f81
MD5 hash:	d3d0fab713c4d62f0c00a790b9b820dc
humanhash:	papa-monkey-william-twelve
File name:	SecuriteInfo.com.Exploit.Siggen3.9428.7521.19336
Download:	download sample
Signature	ZLoader Create hunting rule
File size:	31'744 bytes
First seen:	2021-02-06 07:52:03 UTC
Last seen:	Never
File type:	xlsx
MIME type:	application/vnd.ms-excel
ssdeep	768:AXk3hOdsylKlgryzc4bNhZFGzE+cL2knAJR1ilas2uOiCFePpJmPxS:Ck3hOdsylKlgryzc4bNhZFGzE+cL2kn3
TLSH	73E241E7B3C6AD45CD59037548AB82A07723FD112B57978B7389F32A1F71AC04A0369B
Reporter	SecuriteInfoCom
Tags:	ZLoader

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

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 ID	Section size	Section name
1	4096 bytes	DocumentSummaryInformation
2	4096 bytes	SummaryInformation
3	21662 bytes	Workbook

OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

Type	Keyword	Description
AutoExec	Auto_Open	Runs when the Excel Workbook is opened
Suspicious	Base64 Strings	Base64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin

# of uploads :

# of downloads :

202

Origin country :

n/a

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

SecuriteInfo.com.Exploit.Siggen3.9428.7521.19336

Verdict:

Malicious activity

Analysis date:

2021-02-06 07:53:59 UTC

Tags:

macros macros40 generated-doc maldoc-17

Link:

https://app.any.run/tasks/bdb8278b-e29a-4edf-a590-8101e6b2c706

Note:

ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample

Verdict:

Legit

File type:

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Has a screenshot:

False

Contains macros:

True

Detection(s):

SecuriteInfo.com.Exploit.Siggen3.9428.7521.19336.UNOFFICIAL

TwinWave.EvilDoc.Zloader.ComfortablyNumb.20201208.UNOFFICIAL

TwinWave.EvilDoc.Zloader.ComfortablyNumb.M3.20201208.UNOFFICIAL

TwinWave.EvilDoc.Zloader.ComfortablyNumb.M3.20210131.UNOFFICIAL

Result

Verdict:

Malware

Maliciousness:

Behaviour

Creating a window

Result

Verdict:

Malicious

File Type:

Legacy Office File

Link:

https://app.docguard.net/3f3f8fdbbededb44bd91400f0128e43fb071d1646871f46c6589af7370b6c9dd/results/dashboard

Result

Threat name:

Unknown

Detection:

malicious

Classification:

n/a

Score:

56 / 100

Link:

https://www.joesandbox.com/analysis/601018

Signature

Multi AV Scanner detection for submitted file

Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)

Behaviour

Behavior Graph:

Download SVG

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/3f3f8fdbbededb44bd91400f0128e43fb071d1646871f46c6589af7370b6c9dd/

Threat name:

Document-Word.Downloader.ZLoader

Status:

Malicious

First seen:

2021-02-06 05:32:28 UTC

AV detection:

15 of 29 (51.72%)

Threat level:

3/5

Result

Malware family:

n/a

Score:

8/10

Tags:

macro xlm

Link:

https://tria.ge/reports/210206-rhy9xxvx8j/

Behaviour

Checks processor information in registry

Enumerates system info in registry

Modifies Internet Explorer settings

Suspicious behavior: AddClipboardFormatListener

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of SetWindowsHookEx

Please note that we are no longer able to provide a coverage score for Virus Total.

Threat name:

Malicious File

Score:

0.91

Link:

https://yomi.yoroi.company/submissions/3f3f8fdbbededb44bd91400f0128e43fb071d1646871f46c6589af7370b6c9dd

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:	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:	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_EnableContent_String_Gen Create hunting rule
Author:	Florian Roth
Description:	Detects suspicious string that asks to enable active content in Office Doc
Reference:	Internal Research

Rule name:	UAC_bypass_bin_mem Create hunting rule
Author:	James_inthe_box
Description:	UAC bypass in files like avemaria

Rule name:	ZloaderXLSBehavior Create hunting rule

File information

The table below shows additional information about this malware sample such as delivery method and external references.

Web download

ZLoader

xlsx 3f3f8fdbbededb44bd91400f0128e43fb071d1646871f46c6589af7370b6c9dd

(this sample)

URLhaus

https://urlhaus.abuse.ch/url/991992/

Delivery method

Distributed via web download

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