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

Static analysis result for SHA-256 4da83e337e9158f8…

MALICIOUS

Office (OLE) / .XLS

50.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 8ac41ac491ba1a8b008f79df8a1436ab SHA-1: dfeeaaf5e78c2dcb654827446030ccbe8e72e7fc SHA-256: 4da83e337e9158f878697acfb41ce6ee11285a5dfc3b655006dfa69b4ec9a188
80 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled spreadsheet. Heuristics indicate the presence of an Auto_Open macro that uses dangerous functions, specifically the RUN function, to execute arbitrary code. The document body contains text that appears to be a lure to enable macros or editing. The embedded URLs are likely used to download and execute a second-stage payload. The macro sheet contains a marker at offset 0x9661, and the Auto_Open macro is present.

Heuristics 4

  • 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.
  • 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://garosan.ir/xujpuomkaka/D�
    • http://garosan.ir/xujpuomkaka/530340.png

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
16ae0f72ff33f7d3dbb3eaf1a2d1125ab6773a4cb5da33202d64598a460c4fd9		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3514 bytes

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