Office (OOXML) / .XLSM malware analysis — malicious · 2d3ae24331501735

MALICIOUS

Office (OOXML) / .XLSM

87.5 KB Created: 2020-12-14 09:36:27 UTC Authoring application: Microsoft Excel 16.0300

MD5: 93fc56a2993132d37849e84d6bb4b85a SHA-1: ac8876897c48a5db579da59ff9d49e24443dc6b6 SHA-256: 2d3ae2433150173542724e0921aef549e895ec17b3eab20e0ed2eea41ad02ab6

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell

This XLSM file contains a Workbook_Open macro, which is a common technique for executing malicious code upon opening the document. The critical heuristic firing indicates the use of the Shell() function, suggesting the macro attempts to download and execute a second-stage payload. No specific family could be identified, but the execution method is highly suspicious.

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` `895fec3351b5bac6822d40ed7061f875f2cca786733c661e0642dc782d6c3eef`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3516 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` `c67c7ee5c88907c5d47d1341e882bb07477dfb138eb10c8822004773663b8b71`	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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