Office (OOXML) / .XLSX malware analysis — malicious · 493bd3b72616724c

MALICIOUS

Office (OOXML) / .XLSX

81.0 KB Created: 2020-11-01 23:47:54 UTC Authoring application: Microsoft Excel 16.0300

MD5: cd79044c77eb49d8b37a11128e814497 SHA-1: d91262a4598dbdfc19146b32708e6e34a017cf54 SHA-256: 493bd3b72616724cb781cd39e4553c0c60c80fb6234a704e9c953e6f0aca06c2

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 upon opening the document, a common technique for downloading and executing further malicious stages. No specific family could be identified from the available heuristics.

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` `70c195ce87b06f0d700f3e7e0e1cf8bb8990cde40c5740e51f15f327573cead1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2264 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` `7ffa262c990fb5559e59cfdc5bd13d79b920556a2282f09dcf8fd8af9b21563e`	vba-project	OOXML VBA project: xl/vbaProject.bin	14336 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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