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

Static analysis result for SHA-256 c183fbca97ff6ad1…

MALICIOUS

Office (OLE) / .XLS

426.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 898e9dbe7810d0699cb2723153008e5f SHA-1: 42df6b6250da2413ba78090574c2ac9020cf4e3f SHA-256: c183fbca97ff6ad1f9e5c32bb4a3bc35031c0d81a82be10fda0fa5d212f69254
240 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.004 Unix Shell T1204.002 Malicious File T1071.001 Web Protocols

The sample contains both XLM and VBA macros, with the Workbook_Open event triggering execution. Heuristics indicate the use of ShellExecute and URLDownloadToFile APIs, suggesting the macros are designed to download and execute a second-stage payload from the embedded URL. The document body and heuristics confirm a lure to enable macros, a common technique for initial access.

Heuristics 8

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://www.notamuzikaletleri.com/19.gif�
    • https://www.notamuzikaletleri.com/19.gif
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e26e570691e37538cb153a294d4bd7899ebc79f39ec63fd34cf1eae37efa26f6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 9455 bytes
macros.bas
8c21c322bb8b23e7dbfa4da0de1c41676162b0810e96582d1365413c12adc768		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 977 bytes

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