Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 19cecc8970a4d8d8…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:42:29 Authoring application: Microsoft Excel
MD5: 79ff0a4755426b314019c38f192280a2 SHA-1: 8c5dc31ec418620ffab75801e1a0980b5e191dfe SHA-256: 19cecc8970a4d8d816e724fccfe1a281f35c62bcdfbe31223804c5fe6f492775
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. The presence of dangerous formula APIs like RUN suggests the macro is designed to execute arbitrary code. While no specific URLs or hashes were extracted, the Auto_Open macro is highly likely to download and execute a second-stage payload, making it a critical threat.

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
787b2183e883731b7694a2331ece6e320d7260773b61bf984407d4d6e88c145a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6850 bytes

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