MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 b81d1407ef833190714ccb794e46bfccf1c0ad77ae36f32bda09e34f23f0a4fc. 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: 9


Maldoc score: 3


Intelligence 9 IOCs YARA 8 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: b81d1407ef833190714ccb794e46bfccf1c0ad77ae36f32bda09e34f23f0a4fc
SHA3-384 hash: 691797061f21742febdeb83763a98d29ba60a95b19f1be0c90cc8dd50280b70db6e3400cc42b9243c081717e2326ace1
SHA1 hash: 79112b09e45c556b2f55aa33a377438bd5e1b832
MD5 hash: 8ec0149bb9459e744bf7dde17d90e179
humanhash: lithium-white-papa-white
File name:Info-16.xls
Download: download sample
Signature ZLoader
Create hunting rule
File size:31'744 bytes
First seen:2021-02-05 16:39:39 UTC
Last seen:2021-02-05 18:58:12 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 768:YXk3hOdsylKlgryzc4bNhZFGzE+cL2knAJYEWWaOiCQHhtj:Kk3hOdsylKlgryzc4bNhZFGzE+cL2knb
TLSH 86E23EE7B3D6AC45CE49433548A783A07726FC115B67878B7289F7292F72AC08D0355B
Reporter ffforward
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 IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
321636 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
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
2
# of downloads :
144
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Info-16.xls
Verdict:
Malicious activity
Analysis date:
2021-02-05 16:44:25 UTC
Tags:
macros macros40 maldoc-17 generated-doc
Link:
https://app.any.run/tasks/95d04ac0-cfd3-498b-9ed2-f6d0c90799c8

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):
TwinWave.EvilDoc.Zloader.ComfortablyNumb.20201208.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4MacroLuresWatchingTheDectives.20210115.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Zloader.ComfortablyNumb.M3.20210131.UNOFFICIAL
Create hunting rule

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/b81d1407ef833190714ccb794e46bfccf1c0ad77ae36f32bda09e34f23f0a4fc/results/dashboard
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.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Unknown
Detection:
malicious
Classification:
spre.expl.evad
Score:
92 / 100
Link:
https://www.joesandbox.com/analysis/600485
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
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/b81d1407ef833190714ccb794e46bfccf1c0ad77ae36f32bda09e34f23f0a4fc/
Threat name:
Document-Word.Downloader.ZLoader
Create hunting rule
Status:
Malicious
First seen:
2021-02-05 16:40:10 UTC
AV detection:
12 of 29 (41.38%)
Threat level:
  3/5
Result
Malware family:
n/a
Score:
  10/10
Tags:
macro xlm
Link:
https://tria.ge/reports/210205-j2dk86ct7e/
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
Malware Config
Dropper Extraction:
https://mukaznigerialtd.com.ng/server.php
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/b81d1407ef833190714ccb794e46bfccf1c0ad77ae36f32bda09e34f23f0a4fc

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.

  
Delivery method
Distributed via e-mail link

Comments