Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 6ad67563ff83650d…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:43 Authoring application: Microsoft Excel
MD5: d4d141f1346d11a85c16028409e1aeae SHA-1: 396ba2b274a68fa3fd64d26fa7ec5a80259ebf91 SHA-256: 6ad67563ff83650d96d902b9b37dda4edd7b1aa28760779d5d640bf844780870
140 Risk Score

Malware Insights

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

The critical heuristics indicate the presence of Excel 4.0 macros with an Auto_Open defined name, which is a common technique for executing malicious code. The macro sheet contains dangerous formula APIs, suggesting an attempt to run arbitrary commands or download payloads. The presence of an Auto_Open entry points to an automated execution flow upon opening the document.

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
f4232c6be4917d659b3ad4592ceba59092332435b407289c39b57c8b96087544		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6983 bytes

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