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

Static analysis result for SHA-256 ce4c65f246e06bea…

MALICIOUS

Office (OLE) / .XLS

50.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel
MD5: a6d8ec0ba1e5fc696ceba867f2ea1a6f SHA-1: 037d13947324d61f9240b2dd2d8e5811f698847c SHA-256: ce4c65f246e06beab38b74be1e7fbff936f74b37559525f41a60471658cdf6c4
80 Risk Score

Malware Insights

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

The sample is an Excel 4.0 (XLM) macro-enabled spreadsheet. It contains an Auto_Open macro that uses dangerous formula APIs, specifically the RUN function, to download a file from 'http://mahathi2.ondemandcreative.com/24.gif'. The document body also contains text that appears to be a deconstructed attempt to call URLDownloadToFileA, suggesting the downloaded file is intended to be saved as 'C:\ProgramData\Triolexplorer\24.gif.exe'. The presence of a macro-enable lure further supports the malicious intent.

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.
  • 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
  • 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 http://mahathi2.ondemandcreative.com/24.gif�
    • http://mahathi2.ondemandcreative.com/24.gif

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
b85a04030ee15a5823afbe8a5c58782f7c760714b2f75fcf902d376138ea1320
xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 2772 bytes