Office (OOXML) / .XLSM malware analysis — malicious · b596a93026d84f45

MALICIOUS

Office (OOXML) / .XLSM

435.7 KB Created: 2021-07-28 10:37:27 UTC Authoring application: Microsoft Excel 12.0000

MD5: a9526ee32c591704694a59caa73381af SHA-1: f75134ca3acdbfb5a53e0621b435e2bf83389490 SHA-256: b596a93026d84f45c2b1da155a690c43dbd7e0f34da4d3e3bcaa50515f14e162

148 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a macro-enabled Excel file (XLSM) that contains a Workbook_Open macro. This macro is designed to construct a command using environment variables and cell values, write it to a file, and then execute it using CreateObject. This indicates a downloader or dropper functionality. The specific command executed is obfuscated, but the overall intent is to run a second-stage payload.

Heuristics 5

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `21c5dfa4d24b5f86e0bee5ff2360998f2581e5d5277a020472f6ae4298860a4f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1169 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` `671c514886e51753b00bbb650b41a48e6722e0ba8b151dd9cc09af388ae001ec`	vba-project	OOXML VBA project: xl/vbaProject.bin	9216 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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