Office (OOXML) / .XLSM malware analysis — malicious · 540ffe6a7836cf94

MALICIOUS

Office (OOXML) / .XLSM

89.8 KB Created: 2001-12-21 16:06:12 UTC Authoring application: Microsoft Excel 12.0000

MD5: f83db854151b10b3d0401b956fc3e22e SHA-1: f5eacc7cd2eaf52541be5ce49b898e3414c36f1b SHA-256: 540ffe6a7836cf941f49b5b9110ad53943c7abd552f3273cdfd9fed7c938085c

196 Risk Score

Malware Insights

MITRE ATT&CK

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

This XLSM file contains a Workbook_Open macro that is designed to execute automatically when the document is opened. The macro constructs a command using environment variables and cell values, writes it to a file, and then executes it using the Shell() function. This indicates a downloader or dropper functionality, aiming to retrieve and run a secondary payload. The presence of a macro-enable lure further supports this malicious intent.

Heuristics 7

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
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `5367b07f287e2513e11d545fc86f94610b78db454054fa6b162bf45834a32121`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	1924 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` `80bb8222b9f63c6ab91f7f75f166c6a659a55d082d27cd5c55725711ee8810e3`	vba-project	OOXML VBA project: xl/vbaProject.bin	13824 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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