Office (OLE) / .XLS malware analysis — malicious · 910ca00579e61a2b

MALICIOUS

Office (OLE) / .XLS

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

MD5: 896b816f5690a245aeb385239bfbe0a3 SHA-1: dca2a6e23ed1f10348adcd91b8b3238d5b6cd5f1 SHA-256: 910ca00579e61a2bc749b4154b776814306cb3bb47ddf66eba9ff3887a428371

340 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command and Shell

The sample contains both Excel 4.0 (XLM) and VBA macros. The XLM macro sheet has an Auto_Open entry and uses dangerous functions like RUN. The VBA macro explicitly uses URLDownloadToFile to download a file from 'http://prisecomparer.com/ds/1512.gif' and saves it to a path derived from the document's content. This indicates a downloader functionality, likely to fetch and execute a second-stage payload, disguised as a DocuSign notification.

Heuristics 7

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
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.
XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN

Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
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.
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `9f743851029f852c313abe1ca4ebba5d6e6714b29a0765deef128b49edae33ec`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	2036 bytes
`macros.bas` `c3e1431e32df352cbfd71d661cf806f1ecc4ef35060b941b6bf4577b367215c2`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1766 bytes

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