MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015. 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: 11


Maldoc score: 5


Intelligence 11 IOCs YARA 7 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015
SHA3-384 hash: 121a1538a57bd355e2602b1b0c2e0de3d48f698173adb46815b0b0b9fee9539ed23f46245c622477948b2713b3a1890a
SHA1 hash: e9983f38587f57213137c534be223a8931e33e2c
MD5 hash: 25d108bb3181b08a9fb2edc6713323b2
humanhash: twelve-vermont-magazine-shade
File name:Purchase Order.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:69'632 bytes
First seen:2021-03-22 11:32:01 UTC
Last seen:2021-03-22 13:53:37 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 1536:3k3hOdsylKlgryzc4bNhZFGzE+cL2knAPTTy6FetZiJ3K4siS1E:3k3hOdsylKlgryzc4bNhZFGzE+cL2knL
TLSH 8D6319BAF2855E45CDC1473A836B42E43776BD60362B93CAA3C2BB167E3D650C90E543
Reporter lowmal3
Tags:SilentBuilder

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
Application name is Microsoft Excel
Office document is in OLE format
OLE dump

MalwareBazaar was able to identify 4 sections in this file using oledump:

Section IDSection sizeSection name
1108 bytesCompObj
2264 bytesDocumentSummaryInformation
3224 bytesSummaryInformation
465069 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
SuspiciousCommandMay run PowerShell commands
SuspiciousBase64 StringsBase64-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)

Intelligence

File Origin
# of uploads :
2
# of downloads :
119
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Purchase Order.xls
Verdict:
Malicious activity
Analysis date:
2021-03-22 11:37:30 UTC
Tags:
macros maldoc-14 trojan
Link:
https://app.any.run/tasks/c0a7c4f9-9295-499e-a3d4-00f0ad332136

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/125892/
Detection(s):
TwinWave.EvilDoc.Excel4HTTPSplitSoPhysical.202000615.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4Macro.HiddenSheetDLWAKEUP.20200310.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXRSTRGOOD.NEW-OBJECT.201125.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
Creating a process with a hidden window
DNS request
Sending an HTTP GET request
Sending a custom TCP request
Creating a file in the %temp% directory
Creating a process from a recently created file
Launching a process
Launching cmd.exe command interpreter
Deleting a recently created file
Launching a process by exploiting the app vulnerability
Launching a file downloaded from the Internet
Unauthorized injection to a system process
Result
Verdict:
Malicious
File Type:
Legacy Office File
Link:
https://app.docguard.net/744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015/results/dashboard
Payload URLs
URL
File name
Application.Quit
WorkBook
Document image
Image:
Download PNG
Document image
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015
Details
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:
FormBook
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/647670
Signature
Antivirus detection for dropped file
Bypasses PowerShell execution policy
C2 URLs / IPs found in malware configuration
Connects to a pastebin service (likely for C&C)
Document exploit detected (process start blacklist hit)
Found malware configuration
Machine Learning detection for dropped file
Malicious sample detected (through community Yara rule)
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Multi AV Scanner detection for submitted file
Obfuscated command line found
Powershell drops PE file
Queues an APC in another process (thread injection)
Sample uses process hollowing technique
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Powershell Download and Execute IEX
Suspicious powershell command line found
System process connects to network (likely due to code injection or exploit)
Tries to detect virtualization through RDTSC time measurements
Very long command line found
Yara detected FormBook
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 372800 Sample: Purchase Order.xls Startdate: 22/03/2021 Architecture: WINDOWS Score: 100 49 www.sasayamagazine.com 2->49 51 www.cjmaeilnews.com 2->51 53 sasayamagazine.com 2->53 75 Found malware configuration 2->75 77 Malicious sample detected (through community Yara rule) 2->77 79 Multi AV Scanner detection for submitted file 2->79 81 8 other signatures 2->81 13 EXCEL.EXE 27 33 2->13         started        signatures3 process4 file5 43 C:\Users\user\...\Purchase Order.xls.LNK, MS 13->43 dropped 91 Suspicious powershell command line found 13->91 93 Obfuscated command line found 13->93 17 powershell.exe 15 22 13->17         started        signatures6 process7 dnsIp8 45 104.21.45.223, 443, 49744 CLOUDFLARENETUS United States 17->45 47 paste.ee 172.67.219.133, 49743, 80 CLOUDFLARENETUS United States 17->47 63 Very long command line found 17->63 65 Bypasses PowerShell execution policy 17->65 67 Powershell drops PE file 17->67 21 powershell.exe 17 17->21         started        25 conhost.exe 17->25         started        signatures9 process10 dnsIp11 55 simpsongroup.ru 45.95.183.230, 49754, 80 M247GB Germany 21->55 41 C:\Users\user\AppData\Local\Temp\qMBRkI.exe, PE32 21->41 dropped 27 qMBRkI.exe 21->27         started        file12 process13 signatures14 83 Antivirus detection for dropped file 27->83 85 Machine Learning detection for dropped file 27->85 87 Modifies the context of a thread in another process (thread injection) 27->87 89 4 other signatures 27->89 30 explorer.exe 27->30 injected process15 dnsIp16 57 anastasiamatkovskia.com 162.241.216.113, 49759, 80 UNIFIEDLAYER-AS-1US United States 30->57 59 www.thesongwriterschool.com 30->59 61 2 other IPs or domains 30->61 95 System process connects to network (likely due to code injection or exploit) 30->95 34 help.exe 30->34         started        signatures17 process18 signatures19 69 Modifies the context of a thread in another process (thread injection) 34->69 71 Maps a DLL or memory area into another process 34->71 73 Tries to detect virtualization through RDTSC time measurements 34->73 37 cmd.exe 1 34->37         started        process20 process21 39 conhost.exe 37->39         started       
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015/
Threat name:
Script.Trojan.Wacatac
Create hunting rule
Status:
Malicious
First seen:
2021-03-22 11:19:29 UTC
AV detection:
6 of 46 (13.04%)
Threat level:
  5/5
Detection(s):
Malicious file
Link:
https://check.spamhaus.org/check/?searchterm=orgpuqztnylcqifah4ngwl7x7kosi4pzf4kgshc7lekwyy2nqakq._file
Result
Malware family:
xloader
Create hunting rule
Score:
  10/10
Tags:
family:xloader loader macro rat xlm
Link:
https://tria.ge/reports/210322-39t6hll4vx/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious behavior: EnumeratesProcesses
Suspicious behavior: MapViewOfSection
Suspicious use of AdjustPrivilegeToken
Suspicious use of FindShellTrayWindow
Suspicious use of SendNotifyMessage
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Suspicious use of SetThreadContext
Loads dropped DLL
Blocklisted process makes network request
Executes dropped EXE
Xloader Payload
Process spawned unexpected child process
Xloader
Malware Config
C2 Extraction:
http://www.koku-jieitai.info/w8en/
Dropper Extraction:
http://paste.ee/r/r87uc
http://simpsongroup.ru/wp-admin/bin.exe
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/744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015

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:Email_stealer_bin_mem
Create hunting rule
Author:James_inthe_box
Description:Email in files like avemaria
Rule name:Excel_Hidden_Macro_Sheet
Create hunting rule
Rule name:IPPort_combo_mem
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:Select_from_enumeration
Create hunting rule
Author:James_inthe_box
Description:IP and port combo
Rule name:SharedStrings
Create hunting rule
Author:Katie Kleemola
Description:Internal names found in LURK0/CCTV0 samples
Rule name:SUSP_Excel4Macro_AutoOpen
Create hunting rule
Author:John Lambert @JohnLaTwC
Description:Detects Excel4 macro use with auto open / close
Rule name:UAC_bypass_bin_mem
Create hunting rule
Author:James_inthe_box
Description:UAC bypass in files like avemaria

File information

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

Malspam

SilentBuilder

Excel file xls 744cfa43336e162820a03f1a6b2ff7fa9d2471f92f14691c5f59156c634d8015

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/125892/

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