MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 81b959953a7d9aee5c2bf88e977cdf2a9e9bef99c04ba89c26671ade1e9619ec. 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


GuLoader


Vendor detections: 6


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

SHA256 hash: 81b959953a7d9aee5c2bf88e977cdf2a9e9bef99c04ba89c26671ade1e9619ec
SHA3-384 hash: 66304d35467953f36cd876f913b6a19fd4b4572b6e236c3c1ee96eca4fe2fc3de1441eb5a5683aeb7b7ab2d9cfe50502
SHA1 hash: ba617ecc10736d21bc2e45637d424c5bfb6f7e6e
MD5 hash: b2c03731c7e88886c49ce4a37e95c92f
humanhash: sink-carbon-social-wisconsin
File name:commercial invoice.doc
Download: download sample
Signature GuLoader
Create hunting rule
File size:731'412 bytes
First seen:2020-09-30 05:24:16 UTC
Last seen:Never
File type:Word file doc
MIME type:text/rtf
ssdeep 12288:BQXaeam31IEpflAV/gm5dLmV7R4iYi1N/VEuFvtdJcZ3A+p1JKbAxk783wGqBkFl:iXaer3DRWpgm5ti4ihXWEfgQyKfGqBkH
TLSH 97F4AFB875047DE6267F536BDA96ACED13B61A239ACBA4CC80A477C30563375FE02C05
Reporter cocaman
Tags:CVE-2017-11882 doc GuLoader


Avatar
cocaman
Malicious email (T1566.001)
From: "Sophia <info@yingdapc.com>"
Received: "from postfix-inbound-6.inbound.mailchannels.net (inbound-egress-6.mailchannels.net [199.10.31.238]) "
Date: "29 Sep 2020 14:01:07 -0700"
Subject: "Commercial Invoice"
Attachment: "commercial invoice.doc"

Intelligence

File Origin
# of uploads :
1
# of downloads :
149
Origin country :
n/a
Vendor Threat Intelligence
Detection(s):
Sanesecurity.Malware.27301.RtfHeur.BadVer.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.FakeRTF-2.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.2017-0199.Obfus.170830.UNOFFICIAL
Create hunting rule

MiscreantPunch.RTF.2017-0199.Obfus.171711.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.RTFFakeVersionWithObjUpdateUKSurfMix.20200514.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Launching a process
Creating a window
DNS request
Creating a file in the %AppData% directory
Sending a custom TCP request
Sending an HTTP GET request
Launching a file downloaded from the Internet
Unauthorized injection to a recently created process
Unauthorized injection to a recently created process by context flags manipulation
Creating a process from a recently created file
Result
Threat name:
GuLoader
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/478036
Signature
Antivirus / Scanner detection for submitted sample
Antivirus detection for dropped file
Antivirus detection for URL or domain
Contains functionality to detect hardware virtualization (CPUID execution measurement)
Contains functionality to hide a thread from the debugger
Hides threads from debuggers
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for dropped file
Multi AV Scanner detection for submitted file
Office equation editor drops PE file
Office equation editor starts processes (likely CVE 2017-11882 or CVE-2018-0802)
Sigma detected: Droppers Exploiting CVE-2017-11882
Sigma detected: EQNEDT32.EXE connecting to internet
Sigma detected: File Dropped By EQNEDT32EXE
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect Any.run
Tries to detect sandboxes and other dynamic analysis tools (process name or module or function)
Tries to detect virtualization through RDTSC time measurements
Yara detected GuLoader
Yara detected VB6 Downloader Generic
Behaviour
Behavior Graph:
Download SVG
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/81b959953a7d9aee5c2bf88e977cdf2a9e9bef99c04ba89c26671ade1e9619ec/
Threat name:
Document-Office.Exploit.CVE-2017-11882
Create hunting rule
Status:
Malicious
First seen:
2020-09-29 06:31:15 UTC
File Type:
Document
Extracted files:
3
AV detection:
17 of 29 (58.62%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=qg4vtfj2pwno4xbl7chjo7g7fkpjx34zybf2rhbgm4nn4huwdhwa._file
Result
Malware family:
n/a
Score:
  8/10
Tags:
n/a
Link:
https://tria.ge/reports/200930-6syhyb1c6a/
Behaviour
Launches Equation Editor
Modifies system certificate store
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: MapViewOfSection
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Checks processor information in registry
Enumerates system info in registry
Office loads VBA resources, possible macro or embedded object present
Suspicious use of NtSetInformationThreadHideFromDebugger
Suspicious use of SetThreadContext
Loads dropped DLL
Blacklisted process makes network request
Executes dropped EXE
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Exploit
Score:
1.00
Link:
https://yomi.yoroi.company/submissions/81b959953a7d9aee5c2bf88e977cdf2a9e9bef99c04ba89c26671ade1e9619ec

File information

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

Malspam

GuLoader

Word file doc 81b959953a7d9aee5c2bf88e977cdf2a9e9bef99c04ba89c26671ade1e9619ec

(this sample)

  
Delivery method
Distributed via e-mail attachment

Comments