Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 a203cc08090e5bde…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-27 11:38:39 Authoring application: Microsoft Excel
MD5: 1fbcc1f583033a52a6f4e2273d665a44 SHA-1: a49d2df32e81d073e0809815b2696f2841eb49c4 SHA-256: a203cc08090e5bde847937681647c626e4e4fdcd5ecfbf29ffd22f30f1b53b82
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 function, which is a known technique for executing malicious code within spreadsheets. The presence of dangerous formula APIs in the Auto_Open macro suggests an intent to exploit this functionality for client execution. No specific family could be identified.

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
3ad35f5805d7ffbc1741b5b4343a38698abe0c8ce78e06f5cd2182294e9876fc		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6812 bytes

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