Office (OLE) / .XLS malware analysis — malicious · a1b49f7175cec2e5

MALICIOUS

Office (OLE) / .XLS

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

MD5: 2f07f52a14e4ec00915160961bf62398 SHA-1: 8b15c5fe52e8814f1e2e10abb3823d6fdd9e27ec SHA-256: a1b49f7175cec2e506b382aeb28a7f078f488f78f77e33cc42a5142ac1e0349e

160 Risk Score

Malware Insights

MITRE ATT&CK

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

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN, strongly indicates malicious intent. The ShellExecute API reference further suggests the execution of arbitrary code. The embedded URLs are likely used to download and execute a secondary payload, consistent with a downloader malware.

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://tured.net/ds/261120.gif
- https://tured.net/ds/261120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `4805caad40efa88359221773489543a181039fb59e7111454d99230bce3bd306`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	6674 bytes

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