Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 038efdfac056a8e5…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:26 Authoring application: Microsoft Excel
MD5: fbac63b32eacb40bca98005c72ce0cc9 SHA-1: a40137577a333acb48af532e9505a2b5df924cc0 SHA-256: 038efdfac056a8e5ba9a80dc03de0dd9a611b9ec23bf0c8f1dbb80e4183bf895
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates the file is designed to automatically execute malicious code upon opening. The presence of dangerous formula APIs further supports the malicious intent, likely for initial execution of a payload.

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
267d72933e36c9b1515c75c965facea5ec968b7c626fb8de2bc39af1a4f2310a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6429 bytes

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