MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0. 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


SilentBuilder


Vendor detections: 13


Maldoc score: 7


Intelligence 13 IOCs YARA 4 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0
SHA3-384 hash: d2570fa080d64429a75169c95f98ee1857a9f775c9355c521a98a84250641c969eb21c3872a994c744e73a780fff2df1
SHA1 hash: eeb95b967ebdc58ec4610ee78bb2ffb88689fa9a
MD5 hash: 7724be54883e4d8e7a6ec6ae25c52421
humanhash: april-undress-don-wyoming
File name:OPAST GROUP LLC.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:158'977 bytes
First seen:2022-01-28 16:03:38 UTC
Last seen:2022-01-30 18:54:06 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:zs+Hyms0k3hbdlylKsgqopeJBWhZFGkE+cMLxAAIb4UgCEqM5mheHRAjNKnlGIz/:o+Hyms0k3hbdlylKsgqopeJBWhZFVE+P
TLSH T110F3BFE663A6C984DF15433E8CF2071A3767EC625BE71747A304732A6DB1EA48D0352B
Reporter TeamDreier
Tags:SilentBuilder xls

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: 7
OLE dump

MalwareBazaar was able to identify 3 sections in this file using oledump:

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3147373 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
IOC91.240.118.168IPv4 address
SuspiciousEXECMay run an executable file or a system
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
2
# of downloads :
127
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
OPAST GROUP LLC.xls
Verdict:
Malicious activity
Analysis date:
2022-01-29 02:08:51 UTC
Tags:
macros macros40 emotet-doc emotet trojan
Link:
https://app.any.run/tasks/295988f5-0ac7-416b-a38c-c04ff7a85171

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:
n/a
Link:
https://www.capesandbox.com/analysis/225174/
Detection(s):
SecuriteInfo.com.Macro.Downlader-9.UNOFFICIAL
Create hunting rule

SecuriteInfo.com.Macro.Downlader-10.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4DragoTrainingMontage.20210204.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XLSLOLBINHammerToFall.20201218.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4MDottedQuadDancingInHeaven.20210421.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Emotet46and2.20220124.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Sending a custom TCP request
Creating a process with a hidden window
Launching a process
Running batch commands
Running batch commands by exploiting the app vulnerability
Sending an HTTP GET request to an infection source
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0/results/dashboard
Payload URLs
URL
File name
http://91.240.118.168/zqqw/zaas/fe.html
Macro1
Document image
Image:
Download PNG
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
cmd cmd.exe macros macros-on-open mshta mshta.exe stripped
Link:
https://www.filescan.io/uploads/61f4143d6a7929f66a202283/reports/918a3979-f1c8-47de-b08a-5238ded8ea7e/overview
Label:
Malicious
Suspicious Score:
7.9/10
Score Malicious:
79%
Score Benign:
21%
Link:
https://www.malware.ai/gui/files/?id=e3034334-674d-4071-a73c-348ac22f2644
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0
Details
Excel 4.0 Macro
Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.
IPv4 Dotted Quad URL
A URL was detected referencing a direct IP address, as opposed to a domain name.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
MSHTA Pivot
Macro may contain a pivot to an external URL resource via MSHTA.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Result
Threat name:
Hidden Macro 4.0 Emotet
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/929794
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Document contains OLE streams with names of living off the land binaries
Document exploit detected (process start blacklist hit)
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Powershell drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: MSHTA Spawning Windows Shell
Sigma detected: Suspicious MSHTA Process Patterns
Sigma detected: Suspicious PowerShell Command Line
Sigma detected: Windows Shell File Write to Suspicious Folder
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
System process connects to network (likely due to code injection or exploit)
Yara detected Emotet
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 562273 Sample: OPAST GROUP LLC.xls Startdate: 28/01/2022 Architecture: WINDOWS Score: 100 49 129.232.188.93 xneeloZA South Africa 2->49 51 162.214.50.39 UNIFIEDLAYER-AS-1US United States 2->51 53 42 other IPs or domains 2->53 63 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->63 65 Multi AV Scanner detection for domain / URL 2->65 67 Found malware configuration 2->67 69 16 other signatures 2->69 15 EXCEL.EXE 53 12 2->15         started        signatures3 process4 file5 47 C:\Users\user\Desktop\OPAST GROUP LLC.xls, Composite 15->47 dropped 18 cmd.exe 15->18         started        process6 process7 20 mshta.exe 11 18->20         started        dnsIp8 55 91.240.118.168, 49167, 49168, 80 GLOBALLAYERNL unknown 20->55 23 powershell.exe 16 7 20->23         started        process9 dnsIp10 57 dtmconsulting.ca 162.241.211.118, 443, 49170 UNIFIEDLAYER-AS-1US United States 23->57 59 praachichemfood.com 103.138.189.128, 80 GBLINK-AS-APGBLINKNETWORKSOLUTIONSPRIVATELIMITEDIN India 23->59 45 C:\ProgramData\QWER.dll, PE32 23->45 dropped 73 Powershell drops PE file 23->73 28 cmd.exe 23->28         started        file11 signatures12 process13 process14 30 rundll32.exe 28->30         started        process15 32 rundll32.exe 1 30->32         started        file16 43 C:\Windows\...\nuiesvnkqyvfdxp.tlz (copy), PE32 32->43 dropped 61 Hides that the sample has been downloaded from the Internet (zone.identifier) 32->61 36 rundll32.exe 32->36         started        signatures17 process18 process19 38 rundll32.exe 1 36->38         started        signatures20 71 Hides that the sample has been downloaded from the Internet (zone.identifier) 38->71 41 rundll32.exe 38->41         started        process21
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0/
Threat name:
Document-Excel.Trojan.Emotet
Create hunting rule
Status:
Malicious
First seen:
2022-01-27 20:25:45 UTC
File Type:
Document
Extracted files:
8
AV detection:
14 of 43 (32.56%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=gmcwzkwbliihyvvxixzsd6bykbwnecibaty6nen2pty7vluyugqa._file
Result
Malware family:
emotet
Create hunting rule
Score:
  10/10
Tags:
family:emotet botnet:epoch4 banker macro trojan xlm
Link:
https://tria.ge/reports/220128-thzdxsgfc4/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Modifies system certificate store
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Enumerates physical storage devices
Program crash
Drops file in System32 directory
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Emotet
Process spawned unexpected child process
Malware Config
C2 Extraction:
160.16.102.168:80
131.100.24.231:80
200.17.134.35:7080
207.38.84.195:8080
212.237.56.116:7080
58.227.42.236:80
104.251.214.46:8080
158.69.222.101:443
192.254.71.210:443
46.55.222.11:443
45.118.135.203:7080
107.182.225.142:8080
103.75.201.2:443
104.168.155.129:8080
195.154.133.20:443
159.8.59.82:8080
110.232.117.186:8080
45.142.114.231:8080
41.76.108.46:8080
203.114.109.124:443
50.116.54.215:443
209.59.138.75:7080
185.157.82.211:8080
164.68.99.3:8080
162.214.50.39:7080
138.185.72.26:8080
178.63.25.185:443
51.15.4.22:443
81.0.236.90:443
216.158.226.206:443
45.176.232.124:443
162.243.175.63:443
212.237.17.99:8080
45.118.115.99:8080
129.232.188.93:443
173.214.173.220:8080
178.79.147.66:8080
176.104.106.96:8080
51.38.71.0:443
173.212.193.249:8080
217.182.143.207:443
212.24.98.99:8080
159.89.230.105:443
79.172.212.216:8080
212.237.5.209:443
Dropper Extraction:
http://91.240.118.168/zqqw/zaas/fe.html
http://91.240.118.168/zqqw/zaas/fe.png
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/33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0

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:Excel_Hidden_Macro_Sheet
Create hunting rule
Rule name:INDICATOR_OLE_Excel4Macros_DL2
Create hunting rule
Author:ditekSHen
Description:Detects OLE Excel 4 Macros documents acting as downloaders
Rule name:Qbot
Create hunting rule
Author:Dhanunjaya
Description:Yara Rule to Detect Qbot
Rule name:SUSP_Excel4Macro_AutoOpen
Create hunting rule
Author:John Lambert @JohnLaTwC
Description:Detects Excel4 macro use with auto open / close

File information

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

Malspam

SilentBuilder

Excel file xls 33056caac15a107c56b745f321f838506cd2090104f1e691ba7cf1faae98a1a0

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/225174/

Comments