Office (OLE) / .XLSX malware analysis — malicious · b2d41bb0c34466d5

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 6e13647c975d5ba43b2bee66a5169a99 SHA-1: b6caaa222cb937e16658b986e9e7c0fca9b147e8 SHA-256: b2d41bb0c34466d572c58c4a3edc7e9d62bdad4a78fedc737442080f4716ed15

120 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File

The sample contains Excel 4.0 macros with an Auto_Open entry, indicating it will execute automatically when the workbook is opened. It also contains a lure to enable macros, impersonating a document signing service. The extracted URL `http://hotelstarpacific.com/netgteq.dll` and the presence of `run,S` and `l32` in the doc body suggest the macro is intended to download and execute a second-stage payload.

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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