Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 da83bc9bc2089a38…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:41:12 Authoring application: Microsoft Excel
MD5: 9634c6beefc311463113d63cb059ffa0 SHA-1: fe3574e21f8593dc689a63c88b7527727395d358 SHA-256: da83bc9bc2089a3821bb7dfa3b65bb073f6a77dd79c1955b10ee4f5f72476145
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 macro sheet is designed to automatically execute code upon opening the workbook. The presence of dangerous formula APIs further supports the malicious intent, likely to download and execute a second-stage 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
de0055ee4cb5b2d8dffd3a5a23808da7e3bde0828b4aae5ab4f40ec2b96e78bc		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6609 bytes

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