Office (OLE) / .XLS malware analysis — malicious · 87c4fe65499f1c9b

MALICIOUS

Office (OLE) / .XLS

76.5 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel

MD5: cbb222ee6db9ed87db40c4c6e82e2442 SHA-1: e8326d8d383d1294904d53b3f590ac34e50c7ed4 SHA-256: 87c4fe65499f1c9b5a43c0da81c1c621c73c94b32009985df3f4e331411082d3

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1204.002 Malicious File

The file is an Excel 4.0 workbook containing an Auto_Open macro, a common technique for executing malicious code upon opening. It impersonates DocuSign, a known lure for users to enable content. The macro attempts to download a file using `rundll32` and `RLDownloadToFileA` from several URLs, indicating it acts as a downloader for a second-stage payload.

Heuristics 5

XLM Auto_Open workbook with payload URL or enable-content lure critical OLE_XLM_AUTOOPEN_PAYLOAD_LURE

Workbook contains an Excel 4.0 macro sheet with Auto_Open / Auto_Close and also exposes a payload URL or enable-content lure in the OLE bytes. This combination is a high-confidence XLM downloader/social-engineering pattern even when formula recovery cannot decode the full macro chain.
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` `75fe9d9f30fafc4f16de9f927e37480eac5c8eb4707ad096446109a83ec6c9ee`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2255 bytes

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