Office (OLE) / .XLS malware analysis — malicious · 5978d6b4df2083c3

MALICIOUS

Office (OLE) / .XLS

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

MD5: 2d253fef7f9f804bb3943cc0e367e117 SHA-1: e7e3b5b9f043838c13b3891936309b6ec5fa62cb SHA-256: 5978d6b4df2083c36f7204a4d45dfbfde30ef93cb79d46db4d800187466a93f4

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes the URLDownloadToFile API. This indicates the macro is designed to download a second-stage payload from the embedded URL. The presence of a suspicious DLL path in the document body further supports the malicious intent. The ClamAV detection name 'Doc.Downloader' also aligns with this observed behavior.

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://tiesta.in/ds/291120.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`xlm_macros.txt` `6b210754878c93b9fd2b7ca4692041f142e3090caa22e3cd8ad7cdde6e2f4e8e`	xlm-macro	oletools.olevba.extract_all_macros (XLM macro listing)	981 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 shell/COM execution token(s).

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