MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000. 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: 13


Maldoc score: 7


Intelligence 13 IOCs YARA 3 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: 91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000
SHA3-384 hash: b58b568977a4ed6038e00e6f70528361ad418982134e9588626c9a43a50faec8d9c192002593e3ca2fd6c31ab13563b2
SHA1 hash: 94b85ede89dd8a4e9ef4d9b01fcc83d92bfae918
MD5 hash: 9009b2d1521f3e7e6a1b55cada6bfbf6
humanhash: jersey-connecticut-fish-march
File name:Fakturierung 2022.29.03_1242.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:129'536 bytes
First seen:2022-03-29 10:46:43 UTC
Last seen:2022-03-31 09:41:49 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:EsKpbdrHYrMue8q7QPX+5xtekEdi8/dgt3Syz+nzQIceCRlCo:7KpbdrHYrMue8q7QPX+5xtFEdi8/dgtp
TLSH T1DAC3AD8BB659486CE922877489DB879A7323FC354F6B47473214F3367EB94A04E0324B
Reporter Anonymous
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
3119187 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 :
4
# of downloads :
198
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/259121/
Detection(s):
SecuriteInfo.com.Macro.Downlader-14.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4DataopItWasGoodLivingWithYou.20211109.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.BITSADMIN.EXE.200327.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOOD.AOEX4.BITSNEEDEDFOR.URLDOWNLOADTOFILE.200415.UNOFFICIAL
Create hunting rule

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

TwinWave.EvilDoc.XL4MStringFractures.20210921.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOODXL4.HTTP
Create hunting rule

TwinWave.EvilDoc.DOCXSTRGOODXL4.HTTPS
Create hunting rule

TwinWave.EvilDoc.XLSLOLBINHammerToFall.20201218.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20210611.UNOFFICIAL
Create hunting rule

TwinWave.EvilDoc.DataOpGodGaveRockNRoll2U.20211215.UNOFFICIAL
Create hunting rule

Result
Verdict:
Suspicious
Maliciousness:

Behaviour
Searching for the window
Creating a window
Сreating synchronization primitives
DNS request
Creating a file
Sending an HTTP GET request
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000/results/dashboard
Document image
Image:
Download PNG
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
macros macros-on-open regsvr32 regsvr32.exe
Link:
https://www.filescan.io/uploads/6242e3a79253b276b79ac47a/reports/772680cf-39aa-41d2-9e58-e71cd0c314a3/overview
Label:
Malicious
Suspicious Score:
5.9/10
Score Malicious:
59%
Score Benign:
41%
Link:
https://www.malware.ai/gui/files/?id=f904be7a-1131-4427-b7d3-a21993b8b809
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000
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 Emotet
Create hunting rule
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Link:
https://www.joesandbox.com/analysis/966609
Signature
Antivirus detection for URL or domain
C2 URLs / IPs found in malware configuration
Document exploit detected (creates forbidden files)
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 Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Hides that the sample has been downloaded from the Internet (zone.identifier)
Machine Learning detection for dropped file
Office process drops PE file
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Regsvr32 Command Line Without DLL
Sigma detected: Regsvr32 Network Activity
System process connects to network (likely due to code injection or exploit)
Yara detected Emotet
Behaviour
Behavior Graph:
Download SVG
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 599122 Sample: Fakturierung 2022.29.03_1242.xls Startdate: 29/03/2022 Architecture: WINDOWS Score: 100 41 129.232.188.93 xneeloZA South Africa 2->41 43 185.8.212.130 UZINFOCOMUZ Uzbekistan 2->43 45 57 other IPs or domains 2->45 57 Found malware configuration 2->57 59 Antivirus detection for URL or domain 2->59 61 Found malicious Excel 4.0 Macro 2->61 63 11 other signatures 2->63 11 EXCEL.EXE 9 22 2->11         started        signatures3 process4 dnsIp5 47 drvishalchestclinic.com 172.105.51.130, 49167, 80 LINODE-APLinodeLLCUS United States 11->47 49 funestotal.com 168.197.51.146, 49168, 80 DattateccomAR Argentina 11->49 35 C:\Users\user\efhj.dll, PE32 11->35 dropped 37 C:\Users\user\...\aTNmRa0wnIKwNffH[1].dll, PE32 11->37 dropped 39 C:\Users\...\Fakturierung 2022.29.03_1242.xls, Composite 11->39 dropped 71 Document exploit detected (creates forbidden files) 11->71 73 Document exploit detected (UrlDownloadToFile) 11->73 16 regsvr32.exe 2 11->16         started        file6 signatures7 process8 file9 33 C:\Windows\SysWOW64\...\yjzzpgowfs.jro (copy), PE32 16->33 dropped 55 Hides that the sample has been downloaded from the Internet (zone.identifier) 16->55 20 regsvr32.exe 1 16->20         started        signatures10 process11 signatures12 65 Hides that the sample has been downloaded from the Internet (zone.identifier) 20->65 23 regsvr32.exe 1 20->23         started        process13 signatures14 67 Hides that the sample has been downloaded from the Internet (zone.identifier) 23->67 26 regsvr32.exe 1 23->26         started        process15 signatures16 69 Hides that the sample has been downloaded from the Internet (zone.identifier) 26->69 29 regsvr32.exe 11 26->29         started        process17 dnsIp18 51 189.232.46.161, 443, 49175 UninetSAdeCVMX Mexico 29->51 53 216.120.236.62, 49173, 8080 HOSTROCKETUS United States 29->53 75 System process connects to network (likely due to code injection or exploit) 29->75 signatures19
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000/
Threat name:
Document-Excel.Trojan.Emotet
Create hunting rule
Status:
Malicious
First seen:
2022-03-29 10:47:09 UTC
File Type:
Document
Extracted files:
11
AV detection:
8 of 41 (19.51%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=sg7vwonj7uvvuy46ieficjnvrpphnespo6erfxyyjfxz2vaeoaaa._file
Result
Malware family:
emotet
Create hunting rule
Score:
  10/10
Tags:
family:emotet botnet:epoch4 banker macro suricata trojan xlm
Link:
https://tria.ge/reports/220329-mvh45shcdl/
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 SetWindowsHookEx
Suspicious use of WriteProcessMemory
Drops file in System32 directory
Loads dropped DLL
Downloads MZ/PE file
Emotet
Process spawned unexpected child process
suricata: ET MALWARE W32/Emotet CnC Beacon 3
Malware Config
C2 Extraction:
216.120.236.62:8080
189.232.46.161:443
51.91.76.89:8080
217.182.25.250:8080
119.193.124.41:7080
159.8.59.82:8080
195.201.151.129:8080
58.227.42.236:80
212.24.98.99:8080
138.185.72.26:8080
131.100.24.231:80
192.99.251.50:443
158.69.222.101:443
197.242.150.244:8080
50.116.54.215:443
188.44.20.25:443
212.237.17.99:8080
153.126.146.25:7080
103.75.201.2:443
5.9.116.246:8080
185.8.212.130:7080
164.68.99.3:8080
45.118.135.203:7080
107.182.225.142:8080
151.106.112.196:8080
209.126.98.206:8080
79.172.212.216:8080
51.91.7.5:8080
72.15.201.15:8080
196.218.30.83:443
173.212.193.249:8080
82.165.152.127:8080
101.50.0.91:8080
103.43.46.182:443
216.158.226.206:443
167.172.253.162:8080
159.65.88.10:8080
50.30.40.196:8080
129.232.188.93:443
45.176.232.124:443
203.114.109.124:443
167.99.115.35:8080
195.154.133.20:443
51.254.140.238:7080
206.188.212.92:8080
31.24.158.56:8080
178.79.147.66:8080
45.118.115.99:8080
45.142.114.231:8080
185.157.82.211:8080
209.250.246.206:443
189.126.111.200:7080
1.234.21.73:7080
176.104.106.96:8080
201.94.166.162:443
110.232.117.186:8080
146.59.226.45:443
46.55.222.11:443
1.234.2.232:8080
134.122.66.193:8080
176.56.128.118:443
Dropper Extraction:
http://drvishalchestclinic.com/wp-includes/SqqCZQ6y2uyFF/
Malware family:
Emotet
Create hunting rule
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/91bf5b39a9fd/report/overview.html
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/91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000

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.

Malspam

SilentBuilder

Excel file xls 91bf5b39a9fd2b5a639e410a8125b58bde76924f778912df18496f9d54047000

(this sample)

  
Delivery method
Distributed via e-mail attachment
Cape
Cape
https://www.capesandbox.com/analysis/259121/
  
URLhaus
https://urlhaus.abuse.ch/url/2117937/
  
URLhaus
https://urlhaus.abuse.ch/url/2118001/

Comments