Office (OLE) / .XLS malware analysis — malicious · d0ff739fb563b41c

MALICIOUS

Office (OLE) / .XLS

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

MD5: 1c0c9edd783e46c4a1c3679f56bc7039 SHA-1: 402e1366dfc09639674476e9c7595b26102ee579 SHA-256: d0ff739fb563b41c9ff4535cd03ccd5d4031a9724a8131c35e148e11f82a3437

160 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.004 Shell Script

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN and ShellExecute, indicates a downloader. The macro likely attempts to fetch and execute a payload from the embedded URL. The ClamAV detection name further supports this, identifying it as a downloader.

Heuristics 5

ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
Reference to ShellExecute API high SC_STR_SHELLEXEC

Reference to ShellExecute API
XLM Auto_Open with dangerous formula APIs high 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.
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.
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://birdexim.com/ds/231120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `33b6a73d5f0d6eaa82513d86953f6aef905a69517ef33e4eba1db75f4a178a6f`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6298 bytes

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