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

Static analysis result for SHA-256 095dd24006435241…

MALICIOUS

Office (OLE) / .XLS

89.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: f5ab73fce5791889d025ffe96cb7da34 SHA-1: 01e9b0107095b88a73d66bd1eccb7ad318fe7b75 SHA-256: 095dd24006435241df2f18e24e7227a6285f0f2c935e97712fbea0c5af22f61d
162 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, including an Auto_Open entry, which is a critical finding indicating automatic execution upon opening. The macros utilize dangerous formula APIs, specifically the RUN function, to execute external commands. The embedded URL and the presence of 'rundll32' in the document body suggest that the macro is intended to download and execute a second-stage payload from the specified URL.

Heuristics 5

  • 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.
  • 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.
  • 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 https://shrisaividhyasharam.in/ds/1902.gif�

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
bbd33517393cbce6ee65ec4f25759bc584a492e71d319574161752e5ce8a6fab		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2686 bytes

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