Office (OLE) / .XLS malware analysis — malicious · f22ecc2b3574f423

MALICIOUS

Office (OLE) / .XLS

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

MD5: ced4988c25a7bd84a43d41cf90c2351a SHA-1: d5303805784e2bcd1f4f1bd4d9a74d5b4dd650c8 SHA-256: f22ecc2b3574f42340051664ee3512c69ca9741684aeb52cddd89a9bf02aa9a2

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN and CALL. The heuristic firings indicate the use of ShellExecute and the presence of XLM macros, suggesting an attempt to execute code. The embedded URL likely serves as a distribution point for a second-stage payload. The ClamAV detection name 'Doc.Downloader' further supports this assessment.

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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