Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d6d24ca07f6683ec…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:56 Authoring application: Microsoft Excel
MD5: 7122301574a847ff51ae61e76fd79c20 SHA-1: 768ecc407e1b2a64b6e27a66a787bcc31d3e02df SHA-256: d6d24ca07f6683ec5e75ce8af8438d389a136118249c1a53f4f091daa037f3de
140 Risk Score

Malware Insights

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

The file contains critical heuristic firings indicating the presence of Excel 4.0 macros with an Auto_Open defined name and dangerous formula APIs. This suggests the macro is designed to execute automatically upon opening the document. The macro likely attempts to download and execute a secondary payload, a common technique for initial compromise.

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
0d8038e1a839cc343b8b068bcbb7ea2e3ba93285a4de5463f5299e65bdf5c029		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6801 bytes

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