Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 34de6a9ae2b6d345…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:39:45 Authoring application: Microsoft Excel
MD5: 0a4b467ce9043c1c6bef0e2ba3edacbf SHA-1: 29b67246bcc3b2aa17893dcd623a5728818612f3 SHA-256: 34de6a9ae2b6d34554835085e57c8e3f69f23fab6b561e593087ba78e90e5a0b
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open entry, which is a known technique for executing malicious code upon opening the workbook. The heuristics indicate the use of dangerous formula APIs within the macro, suggesting it's designed to run arbitrary commands. No specific family could be identified, but the execution method is clear.

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
5d6ec5c3b297dae569bb52c162e315355ca2b33c758287fb220eeaef8337d7df		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6469 bytes

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