Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e08ddb99d6675ec6…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-25 10:40:19 Authoring application: Microsoft Excel
MD5: e6d0a3e18d1c53aeaca341b5ad02042b SHA-1: d284b2de966e9caac91c1c6e597251fd2db2bd8c SHA-256: e08ddb99d6675ec6ac50cc7a347b3fe4deac05339d8b4d9457ca0fd1beaeff33
140 Risk Score

Malware Insights

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

The file contains Excel 4.0 (XLM) macros, specifically an Auto_Open macro, which is a known method for executing malicious code. The presence of 'XLM Auto_Open with dangerous formula APIs' indicates that the macro is designed to run potentially harmful functions. This suggests the file is a downloader or dropper for a secondary stage.

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
c8bf79e9966b743c61eaad03e08e6acdf7a09afee8561ea33b1107bf1aff60dd		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6661 bytes

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