MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 597937827f256a0eed431edaf24dc7f83d3ee6ab83006f27b807323e7e5ff91a. 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: 6


Maldoc score: 3


Intelligence 6 IOCs YARA File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 597937827f256a0eed431edaf24dc7f83d3ee6ab83006f27b807323e7e5ff91a
SHA3-384 hash: b04a513976cd87bf07264d456c55faa04c26a9f62d2ac6981876924c9074c1be45592d71613bad9611236a6759a8c336
SHA1 hash: 50fc7e2f6b193f8fdb2db5b1e8cabb1f0b10e1c2
MD5 hash: 6d1fd4cdb9f6644824b0f7e9e5100df7
humanhash: papa-vegan-maryland-kilo
File name:SecuriteInfo.com.Exploit.Siggen3.1924.20713.9540
Download: download sample
Signature ZLoader
Create hunting rule
File size:36'864 bytes
First seen:2020-11-26 00:45:38 UTC
Last seen:Never
File type:Excel file xlsx
MIME type:application/vnd.ms-excel
ssdeep 768:RPqNk3hbdlylKsgqopeJBWhZFGkE+cL2NdAJHgmIpEB5vnDqEdn:Zok3hbdlylKsgqopeJBWhZFGkE+cL2Nc
TLSH 17F283E3FB95EC65CE488379486B42A06723FC51576B938B3385F7367FB1AA04902187
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 IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
326792 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 :
1
# of downloads :
116
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/547510
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: 322858 Sample: SecuriteInfo.com.Exploit.Si... Startdate: 26/11/2020 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\vwYIp.vbs, ASCII 6->27 dropped 29 C:\Users\Public\Documents\Hm1LS.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 skill.fashion 104.27.187.55, 443, 49167 CLOUDFLARENETUS United States 18->31 25 C:\Users\Public\Documents\flJD.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/597937827f256a0eed431edaf24dc7f83d3ee6ab83006f27b807323e7e5ff91a/
Threat name:
Document-Excel.Trojan.ZLoader
Create hunting rule
Status:
Malicious
First seen:
2020-11-25 20:16:40 UTC
AV detection:
13 of 28 (46.43%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=lf4tpat7evva53kdd3npetoh7a6t5zvlqmag6j5ya4zd47s77ena._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
macro
Link:
https://tria.ge/reports/201126-aw2p3esa7x/
Behaviour
Suspicious behavior: GetForegroundWindowSpam
Suspicious use of SetWindowsHookEx
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Please note that we are no longer able to provide a coverage score for Virus Total.

File information

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

Comments