Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 3c9a13ab9e049dc9…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:42:27 Authoring application: Microsoft Excel
MD5: 1982726d8b525b668460f0bedc12ee5f SHA-1: b745d4fde3d2cc1023f1d6e48526449a131380cd SHA-256: 3c9a13ab9e049dc9994f3dfa786130cbe002c4adf4d35256ad9e0442d4830d7e
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 macro, which is a known technique for executing malicious code. The presence of dangerous formula APIs like 'RUN' indicates an intent to execute external commands or download payloads. While no specific URLs or hashes were extracted, the macro's structure strongly suggests it acts as a downloader for further malicious activity.

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
b27211e17bd8be75ff4db48d1d859ed9d607177e947637ee86952678e3e94296		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6442 bytes

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