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MalwareBazaar Database

You are currently viewing the MalwareBazaar entry for SHA256 42a44e52c0b4d3105ce3f46b7ce7bd30eb24c9b320823e1c25d7ca37f1cf32f8. 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: 5


Intelligence 9 IOCs YARA 5 File information Comments

SHA256 hash: 42a44e52c0b4d3105ce3f46b7ce7bd30eb24c9b320823e1c25d7ca37f1cf32f8
SHA3-384 hash: 28c729fb187be8ede375ac5144e24d11f4a8b5d241b06cfae4e7f89495942826ee906a193255a96489f3439ef62f21ee
SHA1 hash: 9401eabf3ce15a433d6664525138fe2635803fb5
MD5 hash: d3a364ed0336ff69de2be8566a60e5c1
humanhash: fourteen-early-double-xray
File name:TerminationLetter.xls
Download: download sample
Signature SilentBuilder
File size:262'656 bytes
First seen:2021-12-20 16:32:53 UTC
Last seen:2021-12-20 18:50:48 UTC
File type:Excel file xls
MIME type:application/vnd.ms-excel
ssdeep 3072:YjsIt8zOnv2Tr1vX2M2/7xcd2j13ws+mY:suzWu2Rk
TLSH T1424451CA9F75CD97CF8A93B68C458980A163BC4416035B07B6C898F7F72B578AE442F4
Reporter 604Kuzushi
Tags:SilentBuilder xls


Avatar
604Kuzushi
IOCs
144.91.122[.100:443
188.214.241[.242:4664
93.104.209[.107:8116
5.189.190[.214:593

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 4 sections in this file using oledump:

Section IDSection sizeSection name
1114 bytesCompObj
2308 bytesDocumentSummaryInformation
3204 bytesSummaryInformation
4257253 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)
SuspiciousXLM macroXLM macro found. It may contain malicious code

Intelligence


File Origin
# of uploads :
2
# of downloads :
141
Origin country :
n/a
Vendor Threat Intelligence
Verdict:
Malicious
File type:
application/vnd.ms-excel
Has a screenshot:
False
Contains macros:
False
Result
Verdict:
Clean
Maliciousness:

Behaviour
Searching for the window
DNS request
Creating a window
Сreating synchronization primitives
Creating a file
Result
Verdict:
Malicious
File Type:
Legacy Excel File
Document image
Document image
Verdict:
Malicious
Threat level:
  10/10
Confidence:
67%
Tags:
macros macros-on-open wscript
Result
Threat name:
Hidden Macro 4.0 Dridex
Detection:
malicious
Classification:
troj.expl.evad
Score:
100 / 100
Signature
Benign windows process drops PE files
C2 URLs / IPs found in malware configuration
Contains functionality to create processes via WMI
Creates processes via WMI
Document contains OLE streams with names of living off the land binaries
Document exploit detected (creates forbidden files)
Document exploit detected (process start blacklist hit)
Found Excel 4.0 Macro with suspicious formulas
Found malicious Excel 4.0 Macro
Found malware configuration
Machine Learning detection for dropped file
Microsoft Office drops suspicious files
Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros)
Potential malicious VBS script found (has network functionality)
Sigma detected: Microsoft Office Product Spawning Windows Shell
Sigma detected: Regsvr32 Command Line Without DLL
Sigma detected: WScript or CScript Dropper
System process connects to network (likely due to code injection or exploit)
Tries to delay execution (extensive OutputDebugStringW loop)
Yara detected Dridex unpacked file
Yara detected hidden Macro 4.0 in Excel
Behaviour
Behavior Graph:
behaviorgraph top1 dnsIp2 2 Behavior Graph ID: 542906 Sample: TerminationLetter.xls Startdate: 20/12/2021 Architecture: WINDOWS Score: 100 32 93.104.209.107 MNET-ASGermanyDE Germany 2->32 34 144.91.122.100 CONTABODE Germany 2->34 36 2 other IPs or domains 2->36 46 Found malware configuration 2->46 48 Found malicious Excel 4.0 Macro 2->48 50 Office document tries to convince victim to disable security protection (e.g. to enable ActiveX or Macros) 2->50 52 12 other signatures 2->52 8 EXCEL.EXE 8 10 2->8         started        12 regsvr32.exe 2->12         started        signatures3 process4 file5 24 C:\Users\user\Desktop\TerminationLetter.xls, Composite 8->24 dropped 26 C:\...\kBrZaQDiGDmsIBbzkbAmhZilWZSYZ.vbs, ASCII 8->26 dropped 56 Document exploit detected (creates forbidden files) 8->56 58 Microsoft Office drops suspicious files 8->58 14 wscript.exe 4 11 8->14         started        19 regsvr32.exe 12->19         started        signatures6 process7 dnsIp8 38 cdn.discordapp.com 162.159.129.233, 443, 49167 CLOUDFLARENETUS United States 14->38 28 C:\...\WEyOySTfJxwMKmzchristmasnigga[1].bin, PE32 14->28 dropped 30 C:\ProgramData\pnigger.bin, PE32 14->30 dropped 40 System process connects to network (likely due to code injection or exploit) 14->40 42 Benign windows process drops PE files 14->42 21 WMIC.exe 14->21         started        44 Tries to delay execution (extensive OutputDebugStringW loop) 19->44 file9 signatures10 process11 signatures12 54 Creates processes via WMI 21->54
Threat name:
Document-Excel.Trojan.Abracadabra
Status:
Malicious
First seen:
2021-12-20 16:33:10 UTC
File Type:
Document
Extracted files:
9
AV detection:
4 of 42 (9.52%)
Threat level:
  5/5
Result
Malware family:
Score:
  10/10
Tags:
family:dridex botnet:22202 botnet loader macro xlm
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
Process spawned suspicious child process
Loads dropped DLL
Blocklisted process makes network request
Downloads MZ/PE file
Dridex Loader
Dridex
Process spawned unexpected child process
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:dridex_halo_generated
Author:Halogen Generated Rule, Corsin Camichel
Rule name:Excel_Hidden_Macro_Sheet
Rule name:Excel_Hidden_Macro_Sheet
Rule name:INDICATOR_OLE_Excel4Macros_DL2
Author:ditekSHen
Description:Detects OLE Excel 4 Macros documents acting as downloaders
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.

Malspam

SilentBuilder

Excel file xls 42a44e52c0b4d3105ce3f46b7ce7bd30eb24c9b320823e1c25d7ca37f1cf32f8

(this sample)

  
Dropping
Dridex
  
Delivery method
Distributed via e-mail attachment

Comments