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

Static analysis result for SHA-256 f669b9a3d89a8061…

MALICIOUS

Office (OLE) / .XLS

54.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a278eb09284581c97e12c62a95c706bb SHA-1: fae3ca2812ffc99d3033ee4915a3b449c07acfab SHA-256: f669b9a3d89a8061089d819d5e4469389656d0ae39188c147592d2e165267b41
300 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1105 Ingress Tool Transfer

The sample is an Excel 4.0 macro-enabled spreadsheet designed to trick users into enabling macros via a lure. Upon enabling, the VBA macro `tres` uses the `URLDownloadToFile` API to download a payload from the reconstructed URL "http://FilesB56". The DOC BODY also contains a URL "cahrhomeopathy.com/diego.png" which may be related to the payload delivery. The presence of both XLM and VBA macros, along with the use of `URLDownloadToFile`, indicates a downloader functionality.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • 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.
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in 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.
  • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
24f925499f7411dfbf00387aa3b0d997e1074fb7605e8ced27990f346b6af8e8		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4818 bytes
macros.bas
0f1242a109be856c87ce725152fafb71b7f7fac0bbc68a186108f82d0b1a5db8		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1728 bytes

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