Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 3e2487adc2ac4c62…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 944a6d61e8398c217db1560e68904a1d SHA-1: 3f1a2496ae47b129ec5f25d9bef087b9345433cb SHA-256: 3e2487adc2ac4c62ceaf0dfd47362174f278f387e7e098dd459bbda10f3ceb81
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 function that utilizes dangerous APIs like RUN and CALL. This indicates an attempt to execute arbitrary code. The presence of an embedded URL suggests the macro's purpose is to download and execute a secondary payload, likely to further compromise the system. The ClamAV detection name 'Doc.Downloader' further supports this conclusion.

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://justhrng.com/ds/231120.gif
    • https://justhrng.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9badecf38f0cfde72dfd647ab7be67f2ec36dad7a41b3ad4474856d47fd4391b
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes