MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 28c65d1f9eccc96780983180a3c32b0c8b5f65c97d06375841c3b01b1c8f616a. 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: 12

Maldoc score: 5

Intelligence 12 IOCs YARA 3 File information Comments 1

SHA256 hash:	28c65d1f9eccc96780983180a3c32b0c8b5f65c97d06375841c3b01b1c8f616a
SHA3-384 hash:	cf2d0284499be4bc39e9c7e7232f92153289acd50896162644300f550062e6c8bc9af35a91301767cc49c4fa680451e2
SHA1 hash:	70289054974bc4b2130819802ed2ac3653f1e812
MD5 hash:	f7414c67ca4855b693237c5c28222aaa
humanhash:	friend-video-juliet-pluto
File name:	f7414c67ca4855b693237c5c28222aaa
Download:	download sample
Signature	SilentBuilder Create hunting rule
File size:	132'117 bytes
First seen:	2022-01-18 13:52:21 UTC
Last seen:	Never
File type:	xlsx
MIME type:	application/vnd.ms-excel
ssdeep	3072:Wuk3hbdlylKsgqopeJBWhZFGkE+cL2NdAxEvN8B/W6X1yxYovrepMUdQ6gSz4i:Fk3hbdlylKsgqopeJBWhZFVE+W2NdAmv
TLSH	T1ADD3AE03A5458F86D54C83B47F5745C46F03AE1CEAF62ACF2542BB133B7ABB1490A52E
Reporter	zbetcheckin
Tags:	excel SilentBuilder xlsx

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

OLE dump

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

Section ID	Section size	Section name
1	4096 bytes	DocumentSummaryInformation
2	4096 bytes	SummaryInformation
3	120088 bytes	Workbook

OLE vba

MalwareBazaar was able to extract and deobfuscate VBA script(s) the following information from OLE objects embedded in this file using olevba:

Type	Keyword	Description
AutoExec	Auto_Open	Runs when the Excel Workbook is opened
Suspicious	Hex Strings	Hex-encoded strings were detected, may be used to obfuscate strings (option --decode to see all)
Suspicious	XLM macro	XLM macro found. It may contain malicious code

Intelligence

File Origin

# of uploads :

# of downloads :

129

Origin country :

n/a

Vendor Threat Intelligence

Verdict:

Malicious

File type:

application/vnd.openxmlformats-officedocument.spreadsheetml.sheet

Has a screenshot:

False

Contains macros:

True

Detection:

n/a

Link:

https://www.capesandbox.com/analysis/220158/

Detection(s):

SecuriteInfo.com.Trojan.GenericKD.47707798.UNOFFICIAL

TwinWave.EvilDoc.DOCXRSTRGOOD.MSHTA.210816.UNOFFICIAL

TwinWave.EvilDoc.Excel4DragoTrainingMontage.20210204.UNOFFICIAL

TwinWave.EvilDoc.DOCXSTRGOODXL4.HTTP

Result

Verdict:

Malware

Maliciousness:

Behaviour

Searching for the window

DNS request

Sending a custom TCP request

Creating a window

Сreating synchronization primitives

Creating a process with a hidden window

Launching a process

Sending an HTTP GET request

Creating a file

Running batch commands

Moving a recently created file

Running batch commands by exploiting the app vulnerability

Sending an HTTP GET request to an infection source

Result

Verdict:

Malicious

File Type:

Legacy Excel File

Link:

https://app.docguard.net/28c65d1f9eccc96780983180a3c32b0c8b5f65c97d06375841c3b01b1c8f616a/results/dashboard

Document image

Image:

Download PNG

Verdict:

Malicious

Threat level:

10/10

Confidence:

100%

Tags:

cmd cmd.exe excel.exe macros macros-on-open mshta mshta.exe print.exe stripped

Link:

https://www.filescan.io/uploads/61e6c649d32385db630203fb/reports/16198eca-d337-4bbc-9297-dcf9563b033a/overview

Label:

Malicious

Suspicious Score:

8.2/10

Score Malicious:

82%

Score Benign:

18%

Link:

https://www.malware.ai/gui/files/?id=b45c1a54-9201-45a0-b057-1eae04bc57ac

Result

Verdict:

MALICIOUS

Link:

https://labs.inquest.net/dfi/sha256/28c65d1f9eccc96780983180a3c32b0c8b5f65c97d06375841c3b01b1c8f616a

Details

Excel 4.0 Macro

Document contains Excel 4.0 macros (XLM). A valid, albeit dated feature, this document should be treated with suspicion.

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.

Document With Minimal Content

Document contains less than 1 kilobyte of semantic information.

Result

Threat name:

Hidden Macro 4.0

Detection:

malicious

Classification:

expl.evad

Score:

100 / 100

Link:

https://www.joesandbox.com/analysis/922435

Signature

Antivirus detection for URL or domain

Document exploit detected (process start blacklist hit)

Found Excel 4.0 Macro with suspicious formulas

Hides that the sample has been downloaded from the Internet (zone.identifier)

Machine Learning detection for dropped file

Multi AV Scanner detection for dropped file

Multi AV Scanner detection for submitted file

Obfuscated command line found

Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)

Powershell drops PE file

Sigma detected: Microsoft Office Product Spawning Windows Shell

Sigma detected: MSHTA Spawning Windows Shell

Sigma detected: Suspicious MSHTA Process Patterns

Sigma detected: Suspicious PowerShell Command Line

Behaviour

Behavior Graph:

Download SVG

Detection:

n/a

Link:

https://mwdb.cert.pl/sample/28c65d1f9eccc96780983180a3c32b0c8b5f65c97d06375841c3b01b1c8f616a/

Threat name:

Document-Excel.Trojan.Emotet

Status:

Malicious

First seen:

2022-01-18 13:49:59 UTC

File Type:

Document

Extracted files:

AV detection:

17 of 28 (60.71%)

Threat level:

5/5

Detection(s):

Suspicious file

Link:

https://check.spamhaus.org/check/?searchterm=fddf2h46ztewpaeyggakhqzlbsfv6zojpuddowcbyoybwhepmfva._file

Result

Malware family:

emotet

Score:

10/10

Tags:

family:emotet botnet:epoch4 banker macro suricata trojan xlm

Link:

https://tria.ge/reports/220118-q61ecabeeq/

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 AdjustPrivilegeToken

Suspicious use of SetWindowsHookEx

Suspicious use of WriteProcessMemory

Enumerates physical storage devices

Program crash

Drops file in System32 directory

Checks computer location settings

Loads dropped DLL

Blocklisted process makes network request

Downloads MZ/PE file

Emotet

Process spawned unexpected child process

Suspicious use of NtCreateProcessExOtherParentProcess

suricata: ET MALWARE W32/Emotet CnC Beacon 3

Malware Config

C2 Extraction:

131.100.24.231:80
209.59.138.75:7080
103.8.26.103:8080
51.38.71.0:443
212.237.17.99:8080
79.172.212.216:8080
207.38.84.195:8080
104.168.155.129:8080
178.79.147.66:8080
46.55.222.11:443
103.8.26.102:8080
192.254.71.210:443
45.176.232.124:443
203.114.109.124:443
51.68.175.8:8080
58.227.42.236:80
45.142.114.231:8080
217.182.143.207:443
178.63.25.185:443
45.118.115.99:8080
103.75.201.2:443
104.251.214.46:8080
158.69.222.101:443
81.0.236.90:443
45.118.135.203:7080
176.104.106.96:8080
212.237.56.116:7080
216.158.226.206:443
173.212.193.249:8080
50.116.54.215:443
138.185.72.26:8080
41.76.108.46:8080
212.237.5.209:443
107.182.225.142:8080
195.154.133.20:443
162.214.50.39:7080
110.232.117.186:8080

Dropper Extraction:

http://0xb907d607/cc.html
http://185.7.214.7/PP91.PNG

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/28c65d1f9eccc96780983180a3c32b0c8b5f65c97d06375841c3b01b1c8f616a

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.