MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 54761cf48b5bf6d5acaac5d0401aba9c84aee8dc46b29abbd7168c437ad6271f. 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: 8

Maldoc score: 3

Intelligence 8 IOCs YARA 8 File information Comments

SHA256 hash:	54761cf48b5bf6d5acaac5d0401aba9c84aee8dc46b29abbd7168c437ad6271f
SHA3-384 hash:	d114db865572f797f755bcdc0adb7c9ff46e6f97a4f630ca3fe801fffb641e122060bb44cd3b745e36f02fbc4d899286
SHA1 hash:	456a375f585af16c52121c7aad1b03a031143d3a
MD5 hash:	a0721848f8dd048e811a9ec349347a9a
humanhash:	echo-kansas-snake-nevada
File name:	a0721848f8dd048e811a9ec349347a9a.xls
Download:	download sample
Signature	ZLoader Create hunting rule
File size:	31'744 bytes
First seen:	2021-02-07 16:07:27 UTC
Last seen:	2021-02-07 17:50:52 UTC
File type:	xls
MIME type:	application/vnd.ms-excel
ssdeep	768:8Xk3hOdsylKlgryzc4bNhZFGzE+cL2knAJ69SOiCcDQxB0JHZ2:ek3hOdsylKlgryzc4bNhZFGzE+cL2knx
TLSH	B4E22EE7F396AD46CE0A433948A782A1B727FC155B57938B7349F32A2F716C0490364B
Reporter	abuse_ch
Tags:	xls 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	21747 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 :

214

Origin country :

n/a

Vendor Threat Intelligence

Malware family:

n/a

ID:

File name:

https://docs.zoho.com/downloaddocument.do?docId=2nv9e0792f1910e014d2387a3affa9764d7c2

Verdict:

Malicious activity

Analysis date:

2021-02-07 13:38:39 UTC

Tags:

maldoc-17

Link:

https://app.any.run/tasks/b3ddce2c-e2e6-45ec-8eac-b70981b903bb

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:

True

Detection(s):

SecuriteInfo.com.Heur.18086.30531.UNOFFICIAL

TwinWave.EvilDoc.Excel4MacroLuresWatchingTheDectives.20210115.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

Creating a file

Creating a process with a hidden window

Launching a process by exploiting the app vulnerability

Result

Verdict:

Malicious

File Type:

Legacy Office File

Link:

https://app.docguard.net/54761cf48b5bf6d5acaac5d0401aba9c84aee8dc46b29abbd7168c437ad6271f/results/dashboard

Result

Threat name:

Unknown

Detection:

malicious

Classification:

spre.expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/601315

Signature

Document exploit detected (creates forbidden files)

Document exploit detected (process start blacklist hit)

Injects code into the Windows Explorer (explorer.exe)

Microsoft Office drops suspicious files

Multi AV Scanner detection for submitted file

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

Potential malicious VBS script found (has network functionality)

Potential malicious VBS script found (suspicious strings)

System process connects to network (likely due to code injection or exploit)

Yara detected VBS Downloader Generic

Behaviour

Behavior Graph:

Download SVG

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/54761cf48b5bf6d5acaac5d0401aba9c84aee8dc46b29abbd7168c437ad6271f/

Threat name:

Document-Word.Downloader.ZLoader

Status:

Malicious

First seen:

2021-02-07 14:42:21 UTC

AV detection:

14 of 29 (48.28%)

Threat level:

3/5

Result

Malware family:

n/a

Score:

10/10

Tags:

macro xlm

Link:

https://tria.ge/reports/210207-tb66vvjdy6/

Behaviour

Checks processor information in registry

Enumerates system info in registry

Modifies Internet Explorer settings

Suspicious behavior: AddClipboardFormatListener

Suspicious behavior: GetForegroundWindowSpam

Suspicious use of FindShellTrayWindow

Suspicious use of SetWindowsHookEx

Malware Config

Dropper Extraction:

https://lincolnplus.ro/server.php
https://idcg.co.in/server.php

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

Threat name:

ZLoader

Score:

1.00

Link:

https://yomi.yoroi.company/submissions/54761cf48b5bf6d5acaac5d0401aba9c84aee8dc46b29abbd7168c437ad6271f

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

xls 54761cf48b5bf6d5acaac5d0401aba9c84aee8dc46b29abbd7168c437ad6271f

(this sample)

URLhaus

https://urlhaus.abuse.ch/url/993755/

Delivery method

Distributed via web download

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