Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 ea30d71fe4758540…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:09 Authoring application: Microsoft Excel
MD5: c8ab9a49ec56956bb6fa3c890491a700 SHA-1: da633792a6327a2b9fda89bd2d4aead9528db145 SHA-256: ea30d71fe47585408c34e7ccfcda27976112573e19529432429dea148ca59ca2
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open entry, which is a common technique for executing malicious code upon opening the workbook. The macro sheet contains numerous string constants and references to dangerous formula APIs, suggesting it is designed to download and execute a secondary payload. No specific family could be identified.

Heuristics 3

  • 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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
e54e4612dd122bc466656612bd44734c993115df555282b25bb80d64987895c4		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6729 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.