Office (OOXML) / .XLSX malware analysis — malicious · 94771c0234c0a2c3

MALICIOUS

Office (OOXML) / .XLSX

213.1 KB Created: 2000-04-13 21:48:14 UTC Authoring application: Microsoft Excel 12.0000

MD5: 0517c01259f2a3c36fc251856072ea3f SHA-1: d8ba4ac98dab5f0276e83b9320fe56cc106f0888 SHA-256: 94771c0234c0a2c3fdd9d127afca07e47430d2082fc89c39d22fbb8a222f0844

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Software Installation

The file exhibits several indicators of malicious behavior, including a VBA macro that executes upon workbook opening, a CreateObject call potentially used to establish a command-line interface, and suspicious extracted artifacts. The macro's behavior, as described in the heuristics, suggests it's designed to download and execute a payload. The `Workbook_Open` macro is a common delivery mechanism for malware, and the `CreateObject` call further supports this intent by potentially establishing a channel for command execution. The overall pattern aligns with a macro-based downloader.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `9df9efc342d5bd01331635315785f7001f7b6c3a10cd0416d921d8052f909b8e`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3563 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `a1b568942b4a78ca5263233681755303929fce2dde28caa5e09ee36dbda125da`	vba-project	OOXML VBA project: xl/vbaProject.bin	16384 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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