Office (OLE) / .XLSX malware analysis — malicious · fc6028f1731d7c61

MALICIOUS

Office (OLE) / .XLSX

37.5 KB Created: 2021-05-06 09:44:37 Authoring application: Microsoft Excel

MD5: 18a6d23e499cec73758a943dc9392821 SHA-1: 583fdda8b474d1ef4d16e250b4d901014377e988 SHA-256: fc6028f1731d7c612c6a4b848df098cfaa7d3caac1a098c526d9eb24d46bd6c2

180 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1547.001 Registry Run Keys / Startup Folder

The file contains VBA macros, specifically a Workbook_Open macro, which is a common technique for initial execution. The presence of a CreateObject call and p-code execution tokens indicates that the macro is designed to run code automatically when the workbook is opened. This macro likely attempts to download and execute a second-stage payload, although no specific URLs or hashes were extracted from this sample.

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` `33e20f5ce16a905407ece5de7556db7dd0a95eca1b69c4285ffb68b0c16b9438`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	4501 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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