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

Static analysis result for SHA-256 a0eb0bff530821b5…

MALICIOUS

Office (OLE) / .XLSX

51.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: e26e0f75112fec7128d39259a1b3cdc7 SHA-1: ec5012bffa7d4e9185c34e4fe95dde967e032c6a SHA-256: a0eb0bff530821b50caa09d507e34f69963d7b8e74cb50667f491dc003241490
80 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro sheet that contains an Auto_Open macro. The macro uses dangerous formula APIs, specifically `RUN` and `URLDownloadToFileA`, to download a file from `http://www.designerconceptsonline.co.za/vauwvgmkcuw/88888.png` and save it to `C:\Asuses\` using `CreateDirectoryA` and `explorer.exe`. The document also contains a lure to enable macros, indicating a malicious intent to execute a second-stage payload.

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://www.designerconceptsonline.co.za/vauwvgmkcuw/88888.png�
    • http://www.designerconceptsonline.co.za/vauwvgmkcuw/88888.png

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9a813e05701bf72fe784c96d1d0e981e7bda423a06c53087d89c8d312d6b8634
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 3492 bytes