MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 79507cc2406fa626da2db0b0bd4ad0b6a21f593ec83b2cdb2a7b0fe299ce6f02. 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: 7


Intelligence 12 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 79507cc2406fa626da2db0b0bd4ad0b6a21f593ec83b2cdb2a7b0fe299ce6f02
SHA3-384 hash: 183a7bb0e07716070294a974f2a8611909b133f71a0a15b41c0823b6a7e00885fc821b79cf58e5012d3c24e17d7d20f9
SHA1 hash: 8a379a9dc8d0a98e6423ebc434908bdae587ec19
MD5 hash: 4afcb45b7ef442ac4a8250eff5bf4c3b
humanhash: east-iowa-thirteen-massachusetts
File name:check.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:117'345 bytes
First seen:2022-01-24 10:19:21 UTC
Last seen:2022-01-24 10:45:08 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:yW+nBqmsk3hbdlylKsgqopeJBWhZFGkE+cMLxAAIXxe53lGvFTQ3IzxgdrvxpU0S:t+nBqmsk3hbdlylKsgqopeJBWhZFVE+S
TLSH T1A4B3AED767DB0889EF29037A8DB607196763FC615BF363472245B32A6E709C09D03A27
Reporter madjack_red
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
3105601 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
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 :
208
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
False
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/221891/
Detection(s):
TwinWave.EvilDoc.DOCXRSTRGOOD.MSHTA.210816.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.DOCXSTRGOODXL4.HTTP
Create hunting rule

TwinWave.EvilDoc.Emotet46and2.20220119.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
Changing an executable file
Launching a process
Running batch commands by exploiting the app vulnerability
Infecting executable files
Sending an HTTP GET request to an infection source
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/79507cc2406fa626da2db0b0bd4ad0b6a21f593ec83b2cdb2a7b0fe299ce6f02/results/dashboard
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 ping print.exe stripped timeout
Link:
https://www.filescan.io/uploads/61ee7d57d32385db63277774/reports/6868d1e6-7ed6-4475-8701-615da3ed153a/overview
Label:
Benign
Suspicious Score:
3.9/10
Score Malicious:
39%
Score Benign:
61%
Link:
https://www.malware.ai/gui/files/?id=6b2c4d67-a9c0-49de-bd8d-d61dbab97963
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/79507cc2406fa626da2db0b0bd4ad0b6a21f593ec83b2cdb2a7b0fe299ce6f02
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.
Result
Threat name:
Hidden Macro 4.0
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/926201
Signature
Antivirus detection for URL or domain
Document exploit detected (process start blacklist hit)
Found abnormal large hidden Excel 4.0 Macro sheet
Found Excel 4.0 Macro with suspicious formulas
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
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Uses ping.exe to check the status of other devices and networks
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 558675 Sample: check.xls Startdate: 24/01/2022 Architecture: WINDOWS Score: 100 62 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->62 64 Antivirus detection for URL or domain 2->64 66 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->66 68 10 other signatures 2->68 14 EXCEL.EXE 53 12 2->14         started        process3 file4 52 C:\Users\user\Desktop\check.xls, Composite 14->52 dropped 78 Obfuscated command line found 14->78 18 cmd.exe 14->18         started        signatures5 process6 signatures7 70 Uses ping.exe to check the status of other devices and networks 18->70 21 mshta.exe 11 18->21         started        24 PING.EXE 18->24         started        26 timeout.exe 18->26         started        process8 dnsIp9 54 185.7.214.7, 49167, 49168, 80 DELUNETDE France 21->54 28 powershell.exe 16 7 21->28         started        56 google.com 142.250.180.110 GOOGLEUS United States 24->56 process10 dnsIp11 58 ss100feet.com 103.104.73.107, 443, 49170 WEBWERKS-AS-INWebWerksIndiaPvtLtdIN India 28->58 60 dopevision.tn 92.222.139.190, 49169, 80 OVHFR France 28->60 50 C:\Users\Public\Documents\ssd.dll, PE32 28->50 dropped 76 Powershell drops PE file 28->76 33 cmd.exe 28->33         started        file12 signatures13 process14 process15 35 rundll32.exe 33->35         started        process16 37 rundll32.exe 2 35->37         started        file17 48 C:\Windows\SysWOW64\...\wcjsgwdwv.hde (copy), PE32 37->48 dropped 72 Hides that the sample has been downloaded from the Internet (zone.identifier) 37->72 41 rundll32.exe 37->41         started        signatures18 process19 process20 43 rundll32.exe 1 41->43         started        signatures21 74 Hides that the sample has been downloaded from the Internet (zone.identifier) 43->74 46 rundll32.exe 43->46         started        process22
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/79507cc2406fa626da2db0b0bd4ad0b6a21f593ec83b2cdb2a7b0fe299ce6f02/
Threat name:
Document-Excel.Trojan.Silentbuilder
Create hunting rule
Status:
Malicious
First seen:
2022-01-24 09:51:01 UTC
File Type:
Document
Extracted files:
8
AV detection:
19 of 43 (44.19%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=pfihzqsan6tcnwrnwcyl2swqw2rb6wj6za5szwzkpmh6fgoon4ba._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/220124-mc4m5aebe6/
Behaviour
Checks processor information in registry
Delays execution with timeout.exe
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Runs ping.exe
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious use of AdjustPrivilegeToken
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:
131.100.24.231:80
209.59.138.75:7080
103.8.26.103:8080
51.38.71.0:443
212.237.17.99:8080
79.172.212.216:8080
207.38.84.195:8080
104.168.155.129:8080
178.79.147.66:8080
46.55.222.11:443
103.8.26.102:8080
192.254.71.210:443
45.176.232.124:443
203.114.109.124:443
51.68.175.8:8080
58.227.42.236:80
45.142.114.231:8080
217.182.143.207:443
178.63.25.185:443
45.118.115.99:8080
103.75.201.2:443
104.251.214.46:8080
158.69.222.101:443
81.0.236.90:443
45.118.135.203:7080
176.104.106.96:8080
212.237.56.116:7080
216.158.226.206:443
173.212.193.249:8080
50.116.54.215:443
138.185.72.26:8080
41.76.108.46:8080
212.237.5.209:443
107.182.225.142:8080
195.154.133.20:443
162.214.50.39:7080
110.232.117.186:8080
Dropper Extraction:
http://0xb907d607/fer/fe5.html
http://185.7.214.7/fer/fe5.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/79507cc2406fa626da2db0b0bd4ad0b6a21f593ec83b2cdb2a7b0fe299ce6f02

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: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.

Cape
Cape
https://www.capesandbox.com/analysis/221891/

Comments