Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 48fcd60b6dd64072…

MALICIOUS

Office (OLE)

35.5 KB Created: 2020-11-25 10:42:42 Authoring application: Microsoft Excel
MD5: be2f29be43735a75d9837e7719e3d26d SHA-1: cc7bd1293da8ee4259eaa3559d25be5384bdeb0e SHA-256: 48fcd60b6dd640726fcf0682dc2d94d61a0c2a600629cb8ec3f39d739bfc0e44
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. The presence of dangerous formula APIs like RUN indicates an intent to run arbitrary commands or download further payloads. Without further script content or network indicators, the exact payload and family remain unknown.

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
c81eaf1aa4030cd89623abb27956c2e432440afc5e2781f4b0a718098544752a		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6434 bytes

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