Office (OOXML) / .XLSX malware analysis — malicious · a004e6ff0aacdc63

MALICIOUS

Office (OOXML) / .XLSX

78.4 KB Created: 2020-11-16 05:28:20 UTC Authoring application: Microsoft Excel 16.0300

MD5: 374d3c78b0143ef0177d2ca6b1e80ab1 SHA-1: f979d5dfffa82401c2bdabe9165bbe0a6b6d6a58 SHA-256: a004e6ff0aacdc6381feb62915302d25ecf6bbc6e382fe8a6c788ade2fbaf956

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The OOXML file contains VBA macros, specifically a Workbook_Open macro that utilizes the Shell() function. This indicates an attempt to execute arbitrary commands, commonly used to download and run additional malicious content. The presence of VBA macros and the use of Shell() are strong indicators of a downloader or initial access stage.

Heuristics 4

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
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` `edb56740b359681ed8cc7b721fd573f456322bc88430b89aef001b00f957fba3`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1692 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` `a45b28b2497d4c733fb2d065425a8c82ec3e79c939428a6cc3be318c55ea3087`	vba-project	OOXML VBA project: xl/vbaProject.bin	13824 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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