Office (OOXML) / .XLSM malware analysis — malicious · 4cedaa22118c9bca

MALICIOUS

Office (OOXML) / .XLSM

147.3 KB Created: 2021-02-23 01:42:22 UTC Authoring application: Microsoft Excel 16.0300

MD5: e8e0a2921ac880e78ee3397932a6da73 SHA-1: 7d5afd9e691cedb7ebe31bb87a32e8dfda7ccb72 SHA-256: 4cedaa22118c9bca2d63edb74a43cc292100d253dab2cd23240cc4e8cc567b92

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell

This XLSM file contains a Workbook_Open macro, a common technique for executing malicious code upon opening the document. The critical heuristic firing indicates the use of the Shell() function, which allows the macro to run arbitrary commands. While no specific family is identified, the presence of a Workbook_Open macro and Shell() execution strongly suggests a downloader or initial execution stage for further malicious activity.

Heuristics 5

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
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://schemas.openxmlformats.org/spreadsheetml/2006/main
- http://schemas.openxmlformats.org/officeDocument/2006/relationships
- http://schemas.openxmlformats.org/markup-compatibility/2006
- http://schemas.microsoft.com/office/spreadsheetml/2009/9/ac
- http://schemas.microsoft.com/office/spreadsheetml/2014/revision
- http://schemas.microsoft.com/office/spreadsheetml/2015/revision2
- http://schemas.microsoft.com/office/spreadsheetml/2016/revision3

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `91e24024c670827f961a5bc181e3ece34045009e29f92e765293636f8378b87c`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	37942 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` `53bb244c524f90c0e27af34bc894d8a659eceb7cf7cc920b2d47f6037692c066`	vba-project	OOXML VBA project: xl/vbaProject.bin	44032 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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