Office (OLE) / .XLSX malware analysis — malicious · b73a2b13c7e0a639

MALICIOUS

Office (OLE) / .XLSX

37.5 KB Created: 2021-04-28 09:51:15 Authoring application: Microsoft Excel

MD5: bdc0c7d382181b01e490f6d265c4ff18 SHA-1: 9c1158a9e0af62c974e00a8f51981554848a19b6 SHA-256: b73a2b13c7e0a63948b9b6861214ef3ba647d3ac83152df4e3e9bbe9eeea1e5f

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1106 Native API

The presence of a Workbook_Open VBA macro, combined with a CreateObject call and p-code execution tokens, strongly indicates that this Excel file is designed to automatically run malicious code upon opening. The macro likely attempts to download and execute a secondary payload, a common technique for initial access and further system compromise. No specific family could be identified from the available heuristics.

Heuristics 5

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` `f38135c4e7abc25c69e532d5913b716904206c0df88ef856bdfafd219871e229`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4857 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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