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

Static analysis result for SHA-256 b51dae4a0ad57603…

MALICIOUS

Office (OLE) / .XLS

62.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 99244e078a8ad50456a007ff55070a70 SHA-1: be5914daad28e8ad18edb12d6bf37196616c752f SHA-256: b51dae4a0ad57603e3f34a78850600b8b15da985fff6d79054d7ae58e8f108fe
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.004 Scripting: PowerShell T1566.001 Phishing: Spearphishing Attachment T1059.001 PowerShell

The file is an Excel 4.0 (XLM) macro sheet that also contains VBA macros. The presence of XLM_AUTOOPEN and Workbook_Open heuristics, along with the SE_ENABLE_LURE heuristic, indicates the document is designed to trick the user into enabling macros. The SC_STR_URLDOWNLOAD heuristic suggests the macro attempts to download a file from the embedded URL http://tak-tik.site/crun20.gif. This downloaded file is likely a second-stage payload. The SC_STR_SHELLEXEC heuristic indicates the execution of external commands.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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 http://tak-tik.site/crun20.gif�
    • http://tak-tik.site/crun20.gif

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
d4222e1ad83b892546402a65bce1342319760d5f0e17d0c73ae5f07e792beb86		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9447 bytes
macros.bas
c29faf2da8b6b84c63880f8f3ff09f138acdaa94ad9406cab75b546ae0e54428		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 979 bytes

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