MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 90f8e36c03ddd0494fd496e4c98cfcef2e11b920fe82de02551eb71304b7360f. 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: 12


Maldoc score: 5


Intelligence 12 IOCs YARA 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 90f8e36c03ddd0494fd496e4c98cfcef2e11b920fe82de02551eb71304b7360f
SHA3-384 hash: 8c8884195d3c5fe37515a2e8a4e57d3fd2ff09d5aeb496dc917f2547565cabae88b251058b402041d082e6c1ecac1d25
SHA1 hash: da37861cfaf2e569a5ccff49ff4e47b1071df8fa
MD5 hash: ce5e6e3ce1c2311d42ee716dc13eb5f4
humanhash: nuts-salami-apart-ink
File name:DOCUMENT_652.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:37'455 bytes
First seen:2022-01-28 07:10:10 UTC
Last seen:2022-01-28 09:01:53 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 768:f1kk3hbdlylKsgqopeJBWhZFGkE+cL2NdAJjj6ehEnmEzk:f1kk3hbdlylKsgqopeJBWhZFGkE+cL2V
TLSH T167F2D7977B8BD999EA45033A4DA34255B713FC159FAB87473204F3261EF89E08D03A1B
Reporter ankit_anubhav
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: 5
OLE dump

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

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
326338 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
IOCCMD.EXEExecutable file name
SuspiciousEXECMay run an executable file or a system
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence

File Origin
# of uploads :
2
# of downloads :
161
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
True
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/224877/
Detection(s):
TwinWave.EvilDoc.DOCXRSTRGOOD.MSHTA.210816.UNOFFICIAL
Create hunting rule

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

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

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Sending a custom TCP request
Creating a window
Сreating synchronization primitives
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/90f8e36c03ddd0494fd496e4c98cfcef2e11b920fe82de02551eb71304b7360f/results/dashboard
Payload URLs
URL
File name
http://91.2
Macro2
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/61f3970d20a5f4d327d88705/reports/a9eebee4-2fca-403a-87a8-78857a063eb3/overview
Label:
Benign
Suspicious Score:
4.8/10
Score Malicious:
49%
Score Benign:
51%
Link:
https://www.malware.ai/gui/files/?id=fed901cc-8ab9-4fe7-9c4b-acf647e0c994
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/90f8e36c03ddd0494fd496e4c98cfcef2e11b920fe82de02551eb71304b7360f
Details
Excel 4.0 Macro
Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.
Macro Execution Coercion
Detected a document that appears to social engineer the user into activating embedded logic.
Autostarting Excel Macro Sheet
Excel contains Macrosheet logic that will trigger automatically upon document open.
Document With Minimal Content
Document contains less than 1 kilobyte of semantic information.
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/929479
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 malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Machine Learning detection for dropped file
Obfuscated command line found
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)
Yara detected Emotet
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 561962 Sample: DOCUMENT_652.xls Startdate: 28/01/2022 Architecture: WINDOWS Score: 100 50 210.57.209.142 UNAIR-AS-IDUniversitasAirlanggaID Indonesia 2->50 52 118.98.72.86 TELKOMNET-AS-APPTTelekomunikasiIndonesiaID Indonesia 2->52 54 30 other IPs or domains 2->54 66 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->66 68 Found malware configuration 2->68 70 Antivirus detection for URL or domain 2->70 72 14 other signatures 2->72 15 EXCEL.EXE 53 12 2->15         started        signatures3 process4 file5 48 C:\Users\user\Desktop\DOCUMENT_652.xls, Composite 15->48 dropped 62 Obfuscated command line found 15->62 19 cmd.exe 15->19         started        signatures6 process7 process8 21 mshta.exe 11 19->21         started        dnsIp9 56 91.240.118.168, 49165, 49166, 80 GLOBALLAYERNL unknown 21->56 24 powershell.exe 12 7 21->24         started        process10 dnsIp11 58 farmmash.com 89.184.68.240, 49167, 80 MIROHOSTWebhostingdatacenteranddomainnamesregistrati Ukraine 24->58 60 karensgardentips.com 107.190.142.107, 49168, 80 DIMENOCUS United States 24->60 46 C:\ProgramData\QWER.dll, PE32 24->46 dropped 76 Powershell drops PE file 24->76 29 cmd.exe 24->29         started        file12 signatures13 process14 process15 31 rundll32.exe 29->31         started        process16 33 rundll32.exe 1 31->33         started        file17 44 C:\Windows\...\usvytjbgoruvgfp.oky (copy), PE32 33->44 dropped 64 Hides that the sample has been downloaded from the Internet (zone.identifier) 33->64 37 rundll32.exe 33->37         started        signatures18 process19 process20 39 rundll32.exe 1 37->39         started        signatures21 74 Hides that the sample has been downloaded from the Internet (zone.identifier) 39->74 42 rundll32.exe 39->42         started        process22
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/90f8e36c03ddd0494fd496e4c98cfcef2e11b920fe82de02551eb71304b7360f/
Threat name:
Document-Excel.Trojan.Emotet
Create hunting rule
Status:
Malicious
First seen:
2022-01-28 07:11:07 UTC
File Type:
Document
Extracted files:
7
AV detection:
12 of 43 (27.91%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=sd4og3ad3xiest6us3smtdh454xbdoja72bn4asvd23rgbfxgyhq._file
Result
Malware family:
emotet
Create hunting rule
Score:
  10/10
Tags:
family:emotet botnet:epoch5 banker macro trojan xlm
Link:
https://tria.ge/reports/220128-hzym6shdg2/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
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:
159.69.43.124:8080
45.79.80.198:443
207.148.81.119:8080
128.199.192.135:8080
118.98.72.86:443
217.182.143.207:443
168.197.250.14:80
116.124.128.206:8080
78.46.73.125:443
185.148.168.15:8080
195.154.146.35:443
85.214.67.203:8080
194.9.172.107:8080
59.148.253.194:443
210.57.209.142:8080
54.38.242.185:443
195.77.239.39:8080
159.69.237.188:443
104.131.62.48:8080
62.171.178.147:8080
142.4.219.173:8080
66.42.57.149:443
78.47.204.80:443
190.90.233.66:443
54.37.228.122:443
185.168.130.138:443
191.252.103.16:80
37.59.209.141:8080
185.148.168.220:8080
37.44.244.177:8080
203.153.216.46:443
45.13.132.26:8080
Dropper Extraction:
http://91.240.118.168/oo/aa/se.html
http://91.240.118.168/oo/aa/se.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/90f8e36c03ddd0494fd496e4c98cfcef2e11b920fe82de02551eb71304b7360f

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: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.

Cape
Cape
https://www.capesandbox.com/analysis/224877/

Comments