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

Static analysis result for SHA-256 71fc6863b7cbf620…

MALICIOUS

Office (OLE) / .XLS

331.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: bb95a335cb1d3ee9b7fe82bbdde95e7b SHA-1: bcb9dc5c9aa5b4b92d2d9e1e252de8f53c809e78 SHA-256: 71fc6863b7cbf620336ac9644d76b8aced31bef88fcccd0a5e313e4417dedc0c
242 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an Excel 4.0 macro-enabled workbook. It contains an Auto_Open macro that uses the RUN function to execute a command. This command constructs a call to 'kernel32.dll' with arguments that appear to be obfuscated, but ultimately likely leads to downloading and executing a payload from the URL https://fisicamp.com/ds/231120.gif. The presence of Auto_Open and the use of RUN indicate a malicious intent to execute code upon opening.

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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3ee92379b19800bb1e16b96d76e4f31800c6dabf549bf8665d8d4ceab7eae6c0		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6060 bytes

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