Office (OLE) / .XLS malware analysis — malicious · f8a9ffaa2dd709df

MALICIOUS

Office (OLE) / .XLS

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

MD5: 72795fcd00e59724d124b19911ffe310 SHA-1: 34c813a48d95d35824748670ad3bc45d0e879ea2 SHA-256: f8a9ffaa2dd709df932bc1a84e3abb888faecd1190a86a54e821b61764b34613

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.004 Python

The presence of Excel 4.0 macros, specifically the Auto_Open function utilizing dangerous APIs like RUN, strongly indicates malicious intent. The heuristic `SC_STR_URLDOWNLOAD` and the embedded URL suggest the macro is designed to download and execute a second-stage payload. The ClamAV detection further corroborates this, identifying the file as a downloader. The document body mentions a path that could be related to the dropped payload.

Heuristics 6

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
ClamAV: Doc.Downloader.Docusign0521-9864805-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Docusign0521-9864805-0
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.
Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
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://auroratd.cf/ds/291120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `97345d96155e2b8e859b77657d9b25bb7a4250bf8ce7d52e355775fc35bc7258`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	983 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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