Office (OOXML) / .XLSM malware analysis — malicious · a41e9786e52fb300

MALICIOUS

Office (OOXML) / .XLSM

144.4 KB Created: 2021-01-09 09:11:09 UTC Authoring application: Microsoft Excel 15.0300

MD5: 0808e9511d3c41e7a31151880cc6a548 SHA-1: f1f13bb2a3b50d986b2a9eefb5247091b3a3209d SHA-256: a41e9786e52fb3009f9c3322bca19e600a7f46689f36893a0564e382555fe4c6

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059 Command and Scripting Interpreter

The presence of a Workbook_Open macro and a Shell() call within the VBA project strongly indicates that this Excel file is designed to automatically execute a secondary payload upon opening. The critical heuristic firing for Shell() confirms the intent to run external commands. While no specific family is identified, the execution method is typical of macro-based malware droppers.

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` `714c4e11b92ce5a0520a88bddfea3d62b6d42a4696f72c71f04a25fb784d2ca8`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	3520 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` `3f67801a90a4b597d1415de594b2e123eec82a12e805913d068dbbadf2e1cec8`	vba-project	OOXML VBA project: xl/vbaProject.bin	17408 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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