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

Static analysis result for SHA-256 09f89aadd7c1456c…

MALICIOUS

Office (OLE) / .XLS

138.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: 1aa8b3abd339038569d7df4fd8e6dc99 SHA-1: 7bed8cddc2d7a354618bd4839fec50047a84c9b1 SHA-256: 09f89aadd7c1456cad78be98286b61277b3de6eecefb3169ee1953bcbcac13c2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous functions, including one that appears to be related to running external commands. The document body contains a lure to enable macros, and the embedded macro likely attempts to download and execute a second-stage payload from the URL hxxp://gcfxb12aefoyn03epdoji.xyz/i. The presence of XLM macros and the use of a lure strongly suggest a malicious intent to compromise the user's system.

Heuristics 4

  • 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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
3a08691eed72e5ed205a0b2d682f61d57bf1de10bae67e5c55da30ecdcba1b08
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 4335 bytes