Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 2acf367912c6434d…

MALICIOUS

Office (OLE) / .XLS

67.5 KB Created: 2020-09-20 21:17:44
MD5: 9a34646477ca3992959e991987f425c4 SHA-1: e39ed9ac96a8fd29f376827d0e102319a3aced72 SHA-256: 2acf367912c6434db5542b2421909d3fed20eebca432016026f15cde142cdd40
100 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File

The presence of Excel 4.0 macros, specifically an Auto_Open macro utilizing dangerous functions like RUN, indicates malicious intent. The heuristic 'SE_LOLBIN_RUN_COMMAND' further suggests the execution of external commands. While the embedded URL was flagged as benign, the overall macro structure strongly implies a downloader or initial execution stage for further malicious activity.

Heuristics 4

  • XLM Auto_Open with dangerous formula APIs high 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.
  • Visible LOLBin command execution instruction high SE_LOLBIN_RUN_COMMAND
    Document contains instructions or visible command text involving Windows script/execution tools such as PowerShell, mshta, cmd, rundll32, or regsvr32
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://tinyurl.com/y2lwkgdg

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
9070c9b271065287fa003bfc349b4ed404b4d1f6d9c5a29550594602847cd30c
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 1023 bytes