Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 9200e7ace830485b…

MALICIOUS

Office (OLE)

36.0 KB Created: 2020-11-25 10:44:23 Authoring application: Microsoft Excel
MD5: 661cd77f323b8bf16d73b186ef4fe4e3 SHA-1: f748ad2c7091ae7f17b20aaf434eee607760eaa7 SHA-256: 9200e7ace830485bf5f1e96197cc8aea126911aed9109fd98f4541a11d53fcaa
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic

The file contains Excel 4.0 macros, specifically an Auto_Open defined name, which is a critical finding. This indicates an attempt to automatically execute code upon opening the workbook. The presence of dangerous formula APIs further suggests malicious intent, likely to download and execute a secondary payload.

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
f951f9f235403bd01dd81c7f3442a8cd1d8c7500a02621b855336486d9cbfe52		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 6631 bytes

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