MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 f5cb3b309d859ced92fbe10d5671b9ab939b986f2044d86aa05cedd5fc38396d. 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: 5


Intelligence 7 IOCs YARA 5 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: f5cb3b309d859ced92fbe10d5671b9ab939b986f2044d86aa05cedd5fc38396d
SHA3-384 hash: ec9924edc931649f6dfe787e63b5c01f95261b739f362708795d775ba7ec1b7f4ae076657c4b2002adb3516c7f7672ae
SHA1 hash: 7c51e96c70c681325041886e53657a35e4e08282
MD5 hash: cd0f35b213590c5e86aeca539718cf9c
humanhash: helium-pizza-cold-glucose
File name:SecuriteInfo.com.Heur.23770.5507
Download: download sample
Signature ZLoader
Create hunting rule
File size:36'864 bytes
First seen:2020-11-27 19:37:29 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 768:MPqNk3hbdlylKsgqopeJBWhZFGkE+cL2NdAJE28c+sfPoEHgE6qi0:Yok3hbdlylKsgqopeJBWhZFGkE+cL2NM
TLSH 10F261F7BAC5AD65CA488376486747A0A702FC552BA783873344F7363FB1BE05902687
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: 5
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
326875 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)

Intelligence

File Origin
# of uploads :
1
# of downloads :
156
Origin country :
n/a
Vendor Threat Intelligence
Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a file
Creating a process with a hidden window
DNS request
Sending a custom TCP request
Deleting a recently created file
Possible injection to a system process
Launching a process by exploiting the app vulnerability
Creating a process from a recently created file
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:
expl.evad
Score:
92 / 100
Link:
https://www.joesandbox.com/analysis/549662
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)
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 323939 Sample: SecuriteInfo.com.Heur.23770.5507 Startdate: 27/11/2020 Architecture: WINDOWS Score: 92 33 Multi AV Scanner detection for submitted file 2->33 35 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->35 37 Potential malicious VBS script found (suspicious strings) 2->37 39 Potential malicious VBS script found (has network functionality) 2->39 6 EXCEL.EXE 60 28 2->6         started        10 explorer.exe 2 2->10         started        12 explorer.exe 2->12         started        process3 file4 27 C:\Users\Public\Documents\gAC.vbs, ASCII 6->27 dropped 29 C:\Users\Public\Documents\DEMt.vbs, ASCII 6->29 dropped 43 Document exploit detected (creates forbidden files) 6->43 45 Injects code into the Windows Explorer (explorer.exe) 6->45 47 Document exploit detected (process start blacklist hit) 6->47 49 Microsoft Office drops suspicious files 6->49 14 explorer.exe 1 6->14         started        16 explorer.exe 1 6->16         started        18 wscript.exe 4 1 10->18         started        23 wscript.exe 12->23         started        signatures5 process6 dnsIp7 31 markens.online 104.31.86.226, 443, 49165 CLOUDFLARENETUS United States 18->31 25 C:\Users\Public\Documents\QxlnZEa5.txt, HTML 18->25 dropped 41 System process connects to network (likely due to code injection or exploit) 18->41 file8 signatures9
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/f5cb3b309d859ced92fbe10d5671b9ab939b986f2044d86aa05cedd5fc38396d/
Threat name:
Document-Office.Trojan.ZLoader
Create hunting rule
Status:
Malicious
First seen:
2020-11-27 19:38:09 UTC
AV detection:
14 of 29 (48.28%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=6xftwme5qwoo3ex34egvm4nzvojzxgdpebcnq2valtw5l7byhfwq._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
macro
Link:
https://tria.ge/reports/201127-cs3zxlj2c2/
Behaviour
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of SetWindowsHookEx
Checks processor information in registry
JavaScript code in executable
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/f5cb3b309d859ced92fbe10d5671b9ab939b986f2044d86aa05cedd5fc38396d

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

File information

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

Comments