Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 95deddaee52770b2…

MALICIOUS

Office (OLE)

37.0 KB Created: 2020-11-25 10:26:21 Authoring application: Microsoft Excel
MD5: 982543bbfe4f56264bdf5ccb23573461 SHA-1: 2e9095d3575fca9d5207938a7a6154cd92610a22 SHA-256: 95deddaee52770b2ab68ce8635019d4384054ecefa2cf2005dc01b115ecb152b
140 Risk Score

Malware Insights

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

The file is an Excel 4.0 macro-enabled workbook containing an Auto_Open defined name, which is a critical indicator of malicious intent. This technique is commonly used to execute arbitrary code upon opening the document, typically to download and run a second-stage payload. No specific URLs or hashes were extracted, limiting further analysis of the 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
355b3c2c0c40f174a5d50a23bc053757a50c48532659e37b1c4b84e6c5201558		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6773 bytes

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