Office (OLE) / .XLS malware analysis — malicious · f5a5cbc90556b00b

MALICIOUS

Office (OLE) / .XLS

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

MD5: bcfd4a96ebd220f7761c20a7e8e00858 SHA-1: 2f34c16581ab1f9be67470b97eebbaf8716df0b5 SHA-256: f5a5cbc90556b00b86af94cfe5e76d06ce2a2201b66afed5a18aad6d09a8d32c

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains Excel 4.0 macros, specifically an Auto_Open macro that utilizes dangerous functions like RUN. The macro references URLDownloadToFile, indicating it's designed to download a file from the embedded URL. The downloaded file is likely intended to be saved as 'Freyrgb.dll' in the C:\ProgramData directory, suggesting a downloader or dropper functionality. The ClamAV detection further supports its malicious nature.

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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