Office (OLE) / .XLSX malware analysis — malicious · 5b2cd57cc3fbf018

MALICIOUS

Office (OLE) / .XLSX

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

MD5: d37c2cb0dc1e621f48c705e12920cfae SHA-1: 8d3fef47059f8aa4ed09fa3a1dcd3a0abab4c4af SHA-256: 5b2cd57cc3fbf018001edc8b5bf0e1ec193d709137c8eb72a136f47b51fb76c6

120 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating automatic execution upon opening. It also includes a lure to enable macros, impersonating a document signing service. The extracted macro content suggests it attempts to download a DLL from 'hotelstarpacific.com/netgteq.dll' and execute it using 'run,DLL32', likely establishing a malicious presence on the system.

Heuristics 4

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `2acc40593deff0c34d67182765876672f026f8c9c5e7440b3c57c2eef485a4a2`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	3778 bytes

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