Office (OOXML) / .XLSX malware analysis — malicious · 4df8dd523d0e458a

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: f4c7c42fddad7089a70cb59728aa66dc SHA-1: 6bc17912a0368a6aa5439c14d8f3bd07127e9744 SHA-256: 4df8dd523d0e458a3704589d57098fb4a8cc54d95b608aae823cddb9c0dc57f6

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter T1071.001 Application Layer Compromise T1566.001 Phishing T1071.002 Remote Services - SMB

The file exhibits multiple indicators of malicious behavior, including a VBA macro that executes upon workbook opening, a suspicious CreateObject call, and the presence of a VBA project file. The macro's `Workbook_Open` subroutine triggers a message box, likely a distraction or to mask malicious activity. The `CreateObject` call suggests the use of COM objects for potentially malicious actions such as downloading and executing a payload. The overall intent is likely to download and execute a secondary payload from a URL, although the exact payload is not visible in the provided evidence. The presence of obfuscated VBA code further suggests an attempt to evade detection.

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` `1797a8c7e1c5b931d4bc9c9125133b4f0f2405a1116e2e613df48d4da9bee264`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3506 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` `24d108ce94c41ced0e2af2a007e21a4afd32f36797376aa4654f0582a9ab8a62`	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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