Office (OLE) / .XLSX malware analysis — malicious · d9ca172127515a17

MALICIOUS

Office (OLE) / .XLSX

275.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel

MD5: 932676055cf50e34d771cac8a039f03b SHA-1: b63106998bfcd03dcb89dcba8005f020e9a54ff2 SHA-256: d9ca172127515a17baae8376ff6084e7853208b0c5a503c2aed3d27b83242aab

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File

The sample contains Excel 4.0 (XLM) macros, including an Auto_Open entry, which are designed to execute automatically when the workbook is opened. The document also contains a lure instructing the user to enable macros, impersonating a document signing service. This combination strongly suggests the intent is to trick the user into running the malicious macros, which likely download and execute a second-stage payload from the embedded URL.

Heuristics 5

Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME

oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN

Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
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
Document signing service impersonation lure medium SE_DOCUSIGN_LURE

Document impersonates DocuSign, Adobe Sign, or a similar signing service in a signing-request context
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 https://www.lincolnschallenge.org/netrdr.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `101c72bb4967734e65d760a20b29c990b5d31cbcd482088257aaf09427470ace`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3252 bytes

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