Office (OLE) / .XLSX malware analysis — malicious · f8e42d238e51f05c

MALICIOUS

Office (OLE) / .XLSX

138.0 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: b95abfdedf5d8b0a00faff49849ae42b SHA-1: eb4b3d92dbb48baf30a95fd9bc01464d49ddfb07 SHA-256: f8e42d238e51f05c0a0773a321bb6126acfef5d86dde02db3744eefeb1fafe5f

240 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains VBA macros, specifically a Workbook_Open event, which is a common technique for initial execution. The script attempts to download and execute a VBS file from a hardcoded URL. The reconstructed URL is 'http://midnighitsilverbcraft.com/store/wBjNOUw/B710N4cQ6R3/'. It also attempts to execute a batch file from 'c:\programdata\bhnasleil.bat'. The presence of these elements strongly suggests a downloader functionality.

Heuristics 6

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `66c05d614a3b9deea1af1907ab9157d78c222ffb1ed4cbb46b8bc9c5d64010e2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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