Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d89062ba53a69864…

MALICIOUS

Office (OLE)

36.5 KB Created: 2020-11-27 11:47:03 Authoring application: Microsoft Excel
MD5: 657872ce71f014a52b15759768d84b5a SHA-1: dc8ae4b342c130d947ea7ffc250af35535b064a4 SHA-256: d89062ba53a6986454e6acb875fb9338ee0dd6a73ebfa2a3a08f059963d2638f
140 Risk Score

Malware Insights

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

The sample is an Excel file containing Excel 4.0 macros, specifically an Auto_Open macro. This macro is configured to execute dangerous formula APIs, indicating an intent to run arbitrary code. The presence of an Auto_Open macro strongly suggests the file is designed to download and execute a second-stage payload upon opening.

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
7f4db7d53e6a111fbc1cfc9ad81bf1fe4fd9a96ce037aee0b7288c25a388421e		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6643 bytes

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