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

Static analysis result for SHA-256 15c7031fd7292845…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 566926ddcff448b87b665430ec5a9eac SHA-1: 29abdd660a5cde2410a4689eec212ab392cdff68 SHA-256: 15c7031fd72928450020b5a89c9deacde340f51be112c2ecc47470728d7e0d4c
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The file contains Excel 4.0 macros with an Auto_Open entry, which is a critical finding. The macros utilize the RUN function and call dangerous formula APIs, including a CALL to execute external code. The script also constructs a URL, "http://l.loungu.com/ds/231120.gif", which is likely used to download a second-stage payload. The presence of ShellExecute API references further supports the malicious intent.

Heuristics 6

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical 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.
  • 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
  • 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 http://l.loungu.com/ds/231120.gif
    • http://l.loungu.com/ds/231120.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
abb07963271b08693dfd8d409076720f3110aa546c958d7d37a9d0626b110da2		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6297 bytes

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