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

Static analysis result for SHA-256 16122c67b5775192…

MALICIOUS

Office (OLE) / .XLS

142.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 669685174ac36cb0b0d56b4ad21350dc SHA-1: a6e051c488fac20afa7712a668d5fb77c45b8b9f SHA-256: 16122c67b5775192f4853c17c5a0c61af01e4deb4f3b757d57639381efaa4401
160 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file contains Excel 4.0 macros, specifically an Auto_Open function, which is a known technique for executing malicious code. The macro sheet contains a reference to a URL, vdk10pfsny03tzfva.com/index., suggesting it is intended to download and execute a second-stage payload. The document also contains a lure to enable macros, further supporting its malicious intent.

Heuristics 4

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
35abf0a61b6cc7d0d67bd7de5baddeefdc7aabb3b44425155a6b39f4cd91b879		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6360 bytes

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