Office (OLE) / .XLSX malware analysis — malicious · 9087a91c1c173e17

MALICIOUS

Office (OLE) / .XLSX

274.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-09-22

MD5: bd12b8c13908102d656706aad34b79e2 SHA-1: e9b5633fdcd89e67eb55c25c0ab90241819137b8 SHA-256: 9087a91c1c173e17dd49d2544d50728181ee83be82f49be053a30dabebd3082e

122 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains Excel 4.0 macros, including an Auto_Open entry, which is a strong indicator of malicious intent. The document also contains a lure to enable macros, impersonating a signing service, and an embedded URL that is likely used to download a secondary payload. The presence of the Auto_Open macro and the lure suggest a downloader or droppper functionality.

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://emploimed.com/netr.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `0e5eb114c8fd5abcfe2f4fcc65b4470ea3e595e7167c7bbcfac8278ee143a695`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3709 bytes

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