SquirrelWaffle — Office (OLE) / .XLS malware analysis

Static analysis result for SHA-256 8e4c165eb5f1072f…

MALICIOUS

Office (OLE) / .XLS

843.5 KB Created: 2015-02-24 20:54:23 Authoring application: Microsoft Excel
MD5: 2b187fac3ba3498d4232d330a1a10690 SHA-1: eb29643f964585cc8ba1c233d63efbec5499178e SHA-256: 8e4c165eb5f1072f84dfd76fd4966e455eaeb0df3a14d20559253d2ebabf7114
242 Risk Score

Malware Insights

SquirrelWaffle · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1071.001 Web Protocols

The file is a macro-enabled Excel spreadsheet containing Auto_Open and Auto_Close macros, indicative of malicious intent. The presence of the URLDownloadToFile API reference and an embedded URL strongly suggests the document's purpose is to download and execute a secondary payload. The ClamAV detection as 'Xls.Downloader.SquirrelWaffle20921-9895790-0' further supports this, identifying it as a SquirrelWaffle variant. The VBA script, while obfuscated, contains logic to execute upon opening, aligning with the downloader pattern.

Heuristics 7

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • ClamAV: Xls.Downloader.SquirrelWaffle20921-9895790-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.SquirrelWaffle20921-9895790-0
  • Auto_Open macro high OLE_VBA_AUTO
    Auto_Open macro
  • Auto_Close macro high OLE_VBA_AUTOCLOSE
    Auto_Close macro
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • Suspicious extracted artifact medium EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://exascale.ca/m1.dll

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
146c044008256769f1ec6ffb9bfbd2906248ac66b41a5b52b383c397aa7d1fff		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3437 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s).

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