MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 5161665dbc1b26196029cfc7eb77f87d0868a714cb692c698a0da2d84265e714. 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: 9


Maldoc score: 9


Intelligence 9 IOCs YARA 10 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 5161665dbc1b26196029cfc7eb77f87d0868a714cb692c698a0da2d84265e714
SHA3-384 hash: 094d75afccfb75357da0cb57f023b0a774be6aee5249ff150aa94b4af591092eb7769c31c47017331a88013231304994
SHA1 hash: fe805111a02aeb15d1cbece930b899195785956a
MD5 hash: ce1851e628a215e39eee820b3f629b5e
humanhash: moon-hamper-don-cold
File name:Att_432126117_2131008625.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:168'448 bytes
First seen:2021-02-25 17:26:05 UTC
Last seen:2021-02-25 18:47:39 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:24L5nJ72YKoGIY2wC4GXN/RfFfysx+jS7uDphYHceXVhca+fMHLtyeGxcl8/dg46:PL5nJ72YKoGIY2wC4GXN/RfFfysx+jSz
TLSH 3AF3D06E7A599C66DA48033484E38B936317BD9AEFB38746764CF2262FB07D0490F507
Reporter p5yb34m
Tags:rob64 SilentBuilder TrickBot xls


Avatar
p5yb34m
.dll:
http://sundancemotelwy.com/dummy/counter.php

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: 9
Application name is Microsoft Excel
Office document is in OLE format
OLE dump

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

Section IDSection sizeSection name
14096 bytesDocumentSummaryInformation
24096 bytesSummaryInformation
3157277 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
SuspiciousFORMULA.FILLMay modify Excel 4 Macro formulas at runtime
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)
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 :
235
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
n/a
ID:
1
File name:
Attach.xls
Verdict:
Malicious activity
Analysis date:
2021-02-25 17:18:38 UTC
Tags:
macros
Link:
https://app.any.run/tasks/9443cae4-d1c5-4c83-b16b-69b49a4fb3e7

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/119274/
Detection(s):
TwinWave.EvilDoc.Excel4Macro.HiddenSheetDLWAKEUP.20200310.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.Excel4MagicPalmersArcade.20201207.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.QakySoWacky.20210218.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.QakySoWacky.M2.20210218.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Creating a window
DNS request
Creating a process with a hidden window
Sending an HTTP GET request
Launching a process by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Office File
Link:
https://app.docguard.net/5161665dbc1b26196029cfc7eb77f87d0868a714cb692c698a0da2d84265e714/results/dashboard
Payload URLs
URL
File name
http://www.iec.ch
WorkBook
Document image
Image:
Download PNG
Document image
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 Trickbot
Create hunting rule
Detection:
malicious
Classification:
troj.spyw.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/619013
Signature
Allocates memory in foreign processes
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Document exploit detected (drops PE files)
Document exploit detected (process start blacklist hit)
Document exploit detected (UrlDownloadToFile)
Drops PE files to the user root directory
Found evasive API chain (trying to detect sleep duration tampering with parallel thread)
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Hijacks the control flow in another process
Machine Learning detection for dropped file
Multi AV Scanner detection for dropped file
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Office process drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Suspicious Svchost Process
Snort IDS alert for network traffic (e.g. based on Emerging Threat rules)
Tries to detect virtualization through RDTSC time measurements
Tries to harvest and steal browser information (history, passwords, etc)
Writes to foreign memory regions
Yara detected hidden Macro 4.0 in Excel
Yara detected Trickbot
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 signatures2 2 Behavior Graph ID: 358503 Sample: Att_432126117_2131008625.xls Startdate: 25/02/2021 Architecture: WINDOWS Score: 100 56 Snort IDS alert for network traffic (e.g. based on Emerging Threat rules) 2->56 58 Found malware configuration 2->58 60 Antivirus detection for URL or domain 2->60 62 13 other signatures 2->62 9 EXCEL.EXE 84 41 2->9         started        14 taskeng.exe 1 2->14         started        process3 dnsIp4 50 sundancemotelwy.com 192.64.118.72, 49165, 80 NAMECHEAP-NETUS United States 9->50 34 C:\Users\user\VDRK.OLASE, PE32 9->34 dropped 36 C:\Users\user\AppData\Local\...\7[1].strike, PE32 9->36 dropped 78 Document exploit detected (process start blacklist hit) 9->78 80 Document exploit detected (UrlDownloadToFile) 9->80 16 rundll32.exe 9->16         started        18 rundll32.exe 14->18         started        file5 signatures6 process7 process8 20 rundll32.exe 16->20         started        signatures9 64 Writes to foreign memory regions 20->64 66 Allocates memory in foreign processes 20->66 23 wermgr.exe 4 8 20->23         started        27 wermgr.exe 20->27         started        process10 dnsIp11 44 182.253.107.34, 443, 49166, 49170 BIZNET-AS-APBIZNETNETWORKSID Indonesia 23->44 46 103.146.185.107, 447, 49171 YAMNET-AS-IDPTYasminAmanahMediaID unknown 23->46 48 6 other IPs or domains 23->48 68 Hijacks the control flow in another process 23->68 70 Tries to harvest and steal browser information (history, passwords, etc) 23->70 72 Writes to foreign memory regions 23->72 29 svchost.exe 13 23->29         started        74 Tries to detect virtualization through RDTSC time measurements 27->74 76 Found evasive API chain (trying to detect sleep duration tampering with parallel thread) 27->76 signatures12 process13 dnsIp14 52 116.68.162.92, 443, 49174 SDI-AS-IDPTSumberDataIndonesiaID Indonesia 29->52 54 177.84.63.252, 443, 49176 PlisInteligenciaemTecnologiaLtdaBR Brazil 29->54 38 C:\Users\user\AppData\Local\...\Web Data.bak, SQLite 29->38 dropped 40 C:\Users\user\AppData\...\Login Data.bak, SQLite 29->40 dropped 42 C:\Users\user\AppData\Local\...\History.bak, SQLite 29->42 dropped 82 Tries to harvest and steal browser information (history, passwords, etc) 29->82 file15 signatures16
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/5161665dbc1b26196029cfc7eb77f87d0868a714cb692c698a0da2d84265e714/
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=kfqwmxn4dmtbsybjz7d6w57ypuegrjyuznusy2mkbwrnqqtf44ka._file
Result
Malware family:
trickbot
Create hunting rule
Score:
  10/10
Tags:
family:trickbot botnet:rob64 banker macro trojan xlm
Link:
https://tria.ge/reports/210225-h6rhyqy36x/
Behaviour
Checks processor information in registry
Enumerates system info in registry
Modifies Internet Explorer settings
Suspicious behavior: AddClipboardFormatListener
Suspicious use of AdjustPrivilegeToken
Suspicious use of SetWindowsHookEx
Suspicious use of WriteProcessMemory
Looks up external IP address via web service
Loads dropped DLL
Templ.dll packer
Process spawned unexpected child process
Trickbot
Malware Config
C2 Extraction:
41.77.134.250:449
45.155.173.242:443
192.162.238.186:449
142.112.79.223:449
122.2.28.70:449
154.126.176.30:449
45.230.244.20:443
182.253.107.34:443
200.52.147.93:443
123.200.26.246:449
131.255.106.152:449
177.85.133.118:449
103.225.138.94:449
142.202.191.164:443
95.210.118.90:449
36.94.62.207:443
201.20.118.122:449
180.92.238.186:449
103.130.6.244:449
202.91.41.138:449
187.20.217.129:449
Dropper Extraction:
http://.php
http://sundancemotelwy.com/dummy/counter.php
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: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:multiple_concats_in_excel4_enjoy_the_silence
Create hunting rule
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats with register Function SILENT BUILDER EDITION
Reference:https://www.youtube.com/watch?v=2sd7MQVofYc
Rule name:multiple_concats_in_excel4_exec_enjoy_the_silence
Create hunting rule
Author:Will Metcalf
Description:Behold The Great And Powerful Match Iterator. Multiple Concats with register Function SILENT BUILDER EDITION
Reference:https://blog.reversinglabs.com/blog/excel-4.0-macros
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 5161665dbc1b26196029cfc7eb77f87d0868a714cb692c698a0da2d84265e714

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/119274/

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