MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 77f1c89eb87eb126ed2c54e2e079f8560dbae9436b6cd2c1a8ca07679bed2f4b. 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: 10


Maldoc score: 7


Intelligence 10 IOCs YARA 4 File information Comments

SHA256 hash: 77f1c89eb87eb126ed2c54e2e079f8560dbae9436b6cd2c1a8ca07679bed2f4b
SHA3-384 hash: acdc5364d7f1d42a27e86a5e98eb020c61accb2b324bb995d62b780aa5ae4f497a323dd533922b9546c502c541e70f38
SHA1 hash: 9151e497274aa1924251f8365104f652a73cb2cd
MD5 hash: 50dd7a7670381cdc33df4dd3ee297382
humanhash: maine-equal-arkansas-bacon
File name:web.xls
Download: download sample
Signature SilentBuilder
File size:252'928 bytes
First seen:2021-11-29 11:48:58 UTC
Last seen:Never
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 6144:MKpb8rGYrMPe3q7Q0XV5xtuEsi8/dgxcfFw6lxFT7kFWqOSMQ6HujLmH98DUu:kFrlxFTMrvbiFd8D7
TLSH T14234E146796CC8DEFA57833148C75BAAA333DC204FD71B876A89722C6FB4DB47912046
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: 7
OLE dump

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

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3241571 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
SuspiciousHex StringsHex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
SuspiciousBase64 StringsBase64-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 :
1
# of downloads :
162
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
web.xls
Verdict:
No threats detected
Analysis date:
2021-11-29 11:50:57 UTC
Tags:
macros

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:
False
Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
DNS request
Creating a file
Creating a window
Сreating synchronization primitives
Sending a custom TCP request by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Payload URLs
URL
File name
ileadafricanow.org
WorkBook
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
macros macros-on-open regsvr32 stripped
Result
Verdict:
MALICIOUS
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:
Hidden Macro 4.0
Detection:
malicious
Classification:
expl.evad
Score:
100 / 100
Signature
Allocates memory in foreign processes
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Injects code into the Windows Explorer (explorer.exe)
Machine Learning detection for dropped file
Maps a DLL or memory area into another process
Multi AV Scanner detection for submitted file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office process drops PE file
Overwrites code with unconditional jumps - possibly settings hooks in foreign process
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Schedule system process
Uses cmd line tools excessively to alter registry or file data
Uses schtasks.exe or at.exe to add and modify task schedules
Writes to foreign memory regions
Yara detected hidden Macro 4.0 in Excel
Behaviour
Behavior Graph:
behaviorgraph top1 signatures2 2 Behavior Graph ID: 530321 Sample: web.xls Startdate: 29/11/2021 Architecture: WINDOWS Score: 100 60 Multi AV Scanner detection for submitted file 2->60 62 Document exploit detected (drops PE files) 2->62 64 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->64 66 6 other signatures 2->66 9 EXCEL.EXE 27 37 2->9         started        14 regsvr32.exe 2->14         started        16 regsvr32.exe 2->16         started        process3 dnsIp4 54 serviceexpress.com.br 192.185.209.237, 443, 49784 UNIFIEDLAYER-AS-1US United States 9->54 56 gcmhp.ps 116.202.249.144, 443, 49782 HETZNER-ASDE Germany 9->56 58 ileadafricanow.org 34.248.68.200, 443, 49783 AMAZON-02US United States 9->58 48 C:\Users\user\Desktop\web.xls, Composite 9->48 dropped 50 C:\Users\user\AppData\Local\...\n3[1].htm, MS-DOS 9->50 dropped 52 C:\Datop\besta.ocx, MS-DOS 9->52 dropped 78 Document exploit detected (UrlDownloadToFile) 9->78 18 regsvr32.exe 9->18         started        21 regsvr32.exe 9->21         started        23 regsvr32.exe 9->23         started        25 regsvr32.exe 14->25         started        27 regsvr32.exe 16->27         started        file5 signatures6 process7 signatures8 68 Overwrites code with unconditional jumps - possibly settings hooks in foreign process 18->68 70 Injects code into the Windows Explorer (explorer.exe) 18->70 72 Writes to foreign memory regions 18->72 29 explorer.exe 8 1 18->29         started        74 Allocates memory in foreign processes 25->74 76 Maps a DLL or memory area into another process 25->76 32 explorer.exe 8 2 25->32         started        process9 signatures10 80 Uses cmd line tools excessively to alter registry or file data 29->80 82 Uses schtasks.exe or at.exe to add and modify task schedules 29->82 34 schtasks.exe 1 29->34         started        36 reg.exe 32->36         started        38 reg.exe 32->38         started        40 conhost.exe 32->40         started        process11 process12 42 conhost.exe 34->42         started        44 conhost.exe 36->44         started        46 conhost.exe 38->46         started       
Threat name:
Document-Excel.Downloader.EncDoc
Status:
Malicious
First seen:
2021-11-29 11:49:09 UTC
File Type:
Document
Extracted files:
18
AV detection:
21 of 28 (75.00%)
Threat level:
  3/5
Result
Malware family:
n/a
Score:
  10/10
Tags:
n/a
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Modifies registry class
Suspicious behavior: AddClipboardFormatListener
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Process spawned unexpected child process
Malware Config
Dropper Extraction:
https://gcmhp.ps/0BDRCN8DXn/n3.html
https://ileadafricanow.org/gZPZb6yK/n2.html
https://serviceexpress.com.br/7mpBmsflb7fe/n1.html
Please note that we are no longer able to provide a coverage score for Virus Total.

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:BitcoinAddress
Author:Didier Stevens (@DidierStevens)
Description:Contains a valid Bitcoin address
Rule name:Excel_Hidden_Macro_Sheet
Rule name:Excel_Hidden_Macro_Sheet
Rule name:SUSP_Excel4Macro_AutoOpen
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.

  
Delivery method
Distributed via e-mail link

Comments