MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea. 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 2 File information Comments
Download sample Add tag Delete this sample Report a False Positive

SHA256 hash: c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea
SHA3-384 hash: 1f9deafa8c05cee85db1d09271bb569c5547825ce6a27077d8dca740278152212cc478ad771920b946d88bb214e7fc4a
SHA1 hash: 938d8adbd401e32603c8583a45dea92358bf1624
MD5 hash: be156b3e93040397ffffd4a46d6a07c4
humanhash: robert-charlie-lithium-bluebird
File name:Form.xls
Download: download sample
Signature SilentBuilder
Create hunting rule
File size:145'920 bytes
First seen:2022-03-24 19:30:48 UTC
Last seen:2022-03-24 21:57:55 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:zOKpbdrHYrMue8q7QPX+5xtekE86W8UM+5/c/mrWmngyYXnMJelsSKThsdskl4WJ:CKpbdrHYrMue8q7QPX+5xtFE86W8UM+S
TLSH T1D3E3CF5AB419D81CF506CB3448CB4BAB6623FC344F5A4A872368F3A57FF9C90960325B
Reporter pr0xylife
Tags:epoch4 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
3134920 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 :
2
# of downloads :
280
Origin country :
n/a
Vendor Threat Intelligence
Malware family:
emotet
Create hunting rule
ID:
1
File name:
c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea.xls
Verdict:
Malicious activity
Analysis date:
2022-03-24 19:34:57 UTC
Tags:
macros emotet-doc emotet
Link:
https://app.any.run/tasks/c0ffefd5-b997-490a-9d01-e01715bfa2f8

Note:
ANY.RUN is an interactive sandbox that analyzes all user actions rather than an uploaded sample
Detection:
n/a
Link:
https://www.capesandbox.com/analysis/257362/
Detection(s):
SecuriteInfo.com.Heur.22055.13189.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.EmotetWarningBarPicturesOfU.MSOLE2.220323.UNOFFICIAL
Create hunting rule

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

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

TwinWave.EvilDoc.XL4QakyFeaturingNothingNowhere.M2.20220215.UNOFFICIAL
Create hunting rule

Result
Verdict:
Malware
Maliciousness:

Behaviour
Searching for the window
Sending a custom TCP request
Creating a window
Сreating synchronization primitives
DNS request
Sending an HTTP GET request
Sending a custom TCP request by exploiting the app vulnerability
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Link:
https://app.docguard.net/c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea/results/dashboard
Payload URLs
URL
File name
cornerstonecreativestudios.com
WorkBook
Document image
Image:
Download PNG
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
100%
Tags:
control.exe greyware keylogger macros macros-on-open regsvr32
Link:
https://www.filescan.io/uploads/623cc7170cd58dbd92e959d6/reports/1bfd81dc-c928-4047-9de0-a7aa02cb7f20/overview
Label:
Malicious
Suspicious Score:
5.8/10
Score Malicious:
59%
Score Benign:
41%
Link:
https://www.malware.ai/gui/files/?id=21554d9c-b7e6-4075-8963-d4e8ba775745
Result
Verdict:
MALICIOUS
Link:
https://labs.inquest.net/dfi/sha256/c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea
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/964004
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)
Multi AV Scanner detection for submitted 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: 596481 Sample: Form.xls Startdate: 24/03/2022 Architecture: WINDOWS Score: 100 56 129.232.188.93 xneeloZA South Africa 2->56 58 185.8.212.130 UZINFOCOMUZ Uzbekistan 2->58 60 55 other IPs or domains 2->60 74 Found malware configuration 2->74 76 Antivirus detection for URL or domain 2->76 78 Multi AV Scanner detection for submitted file 2->78 80 11 other signatures 2->80 15 EXCEL.EXE 11 18 2->15         started        signatures3 process4 dnsIp5 62 csm101.com 195.8.222.36, 443, 49168 ICDSOFTBG Bulgaria 15->62 64 cornerstonecreativestudios.com 208.113.219.140, 443, 49167 DREAMHOST-ASUS United States 15->64 66 dacentec2.layeredserver.com 192.111.147.2, 443, 49169 DACEN-2US United States 15->66 48 C:\Users\user\wesc.dll, PE32 15->48 dropped 50 C:\Users\user\...\dWZCVZCFVMyCWnOs[1].dll, PE32 15->50 dropped 52 C:\Users\user\Desktop\Form.xls, Composite 15->52 dropped 68 Document exploit detected (creates forbidden files) 15->68 70 Document exploit detected (UrlDownloadToFile) 15->70 20 regsvr32.exe 2 15->20         started        file6 signatures7 process8 file9 54 C:\Windows\SysWOW64\...\dgoao.pof (copy), PE32 20->54 dropped 84 Hides that the sample has been downloaded from the Internet (zone.identifier) 20->84 24 regsvr32.exe 1 20->24         started        signatures10 process11 signatures12 88 Hides that the sample has been downloaded from the Internet (zone.identifier) 24->88 27 regsvr32.exe 1 24->27         started        process13 signatures14 92 Hides that the sample has been downloaded from the Internet (zone.identifier) 27->92 30 regsvr32.exe 1 27->30         started        process15 signatures16 96 Hides that the sample has been downloaded from the Internet (zone.identifier) 30->96 33 regsvr32.exe 1 30->33         started        process17 signatures18 72 Hides that the sample has been downloaded from the Internet (zone.identifier) 33->72 36 regsvr32.exe 1 33->36         started        process19 signatures20 82 Hides that the sample has been downloaded from the Internet (zone.identifier) 36->82 39 regsvr32.exe 1 36->39         started        process21 signatures22 86 Hides that the sample has been downloaded from the Internet (zone.identifier) 39->86 42 regsvr32.exe 1 39->42         started        process23 signatures24 90 Hides that the sample has been downloaded from the Internet (zone.identifier) 42->90 45 regsvr32.exe 1 42->45         started        process25 signatures26 94 Hides that the sample has been downloaded from the Internet (zone.identifier) 45->94
Detection:
n/a
Link:
https://mwdb.cert.pl/sample/c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea/
Threat name:
Document-Excel.Trojan.Emotet
Create hunting rule
Status:
Malicious
First seen:
2022-03-24 19:31:13 UTC
File Type:
Document
Extracted files:
10
AV detection:
14 of 26 (53.85%)
Threat level:
  5/5
Detection(s):
Suspicious file
Link:
https://check.spamhaus.org/check/?searchterm=zeou5g3cwlritate2ehvrwptn75ewkc72no5jz36lgefzrlhulva._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/220324-x8fw2sddg9/
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
Malware Config
C2 Extraction:
70.36.102.35:443
92.240.254.110:8080
51.91.76.89:8080
217.182.25.250:8080
119.193.124.41:7080
45.142.114.231:8080
176.56.128.118:443
51.254.140.238:7080
173.212.193.249:8080
131.100.24.231:80
188.44.20.25:443
1.234.2.232:8080
153.126.146.25:7080
51.91.7.5:8080
151.106.112.196:8080
46.55.222.11:443
107.182.225.142:8080
82.165.152.127:8080
212.237.17.99:8080
195.201.151.129:8080
197.242.150.244:8080
103.43.46.182:443
206.188.212.92:8080
196.218.30.83:443
5.9.116.246:8080
185.157.82.211:8080
176.104.106.96:8080
159.65.88.10:8080
212.24.98.99:8080
209.250.246.206:443
45.118.135.203:7080
50.116.54.215:443
178.79.147.66:8080
72.15.201.15:8080
101.50.0.91:8080
103.75.201.2:443
31.24.158.56:8080
146.59.226.45:443
110.232.117.186:8080
138.185.72.26:8080
45.176.232.124:443
189.126.111.200:7080
129.232.188.93:443
158.69.222.101:443
164.68.99.3:8080
209.126.98.206:8080
58.227.42.236:80
203.114.109.124:443
195.154.133.20:443
192.99.251.50:443
1.234.21.73:7080
50.30.40.196:8080
216.158.226.206:443
185.8.212.130:7080
159.8.59.82:8080
45.118.115.99:8080
167.99.115.35:8080
79.172.212.216:8080
Dropper Extraction:
https://cornerstonecreativestudios.com/boards/ilsFKKHH7GaR/
https://csm101.com/transam/T7wblKicmeBabj2h/
https://dacentec2.layeredserver.com/speedtest/yjnnw/
https://datie-tw.com/test/yXPr0DO/
Verdict:
Malicious
Link:
https://www.vmray.com/analyses/c91d4e9b62b2/report/overview.html
Please note that we are no longer able to provide a coverage score for Virus Total.
Threat name:
Suspicious File
Score:
0.50
Link:
https://yomi.yoroi.company/submissions/c91d4e9b62b2e2898264d10f58d9f36ffa4b285fd35dd4e77e59885cc567a2ea

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: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/257362/

Comments