SquirrelWaffle — Office (OLE) / .DOC malware analysis

Static analysis result for SHA-256 e3b6fd87b38e26af…

MALICIOUS

Office (OLE) / .DOC

277.0 KB Created: 2021-09-16 09:44:00 Authoring application: Microsoft Office Word
MD5: 91cb50ebd859a654a5e4d69cee666199 SHA-1: 6bb8fbb0f15a745f7ccccba359658656013e28f6 SHA-256: e3b6fd87b38e26afbb345f049f5b7a68e021184d3c6d341bc9d10200a560948e
302 Risk Score

Malware Insights

SquirrelWaffle · confidence 95%

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The sample contains a critical OLE_VBA_SHELL firing and a critical ClamAV detection for SquirrelWaffle. The AutoOpen macro in macros.bas executes a shell command to run a VBScript downloaded to C:\ProgramData\pin.vbs. The VBScript itself is constructed from a string literal 'IZIMIZIOZI' and a variable 'WW' which appears to be populated from a Form object's caption, suggesting obfuscation or dynamic content. The script then executes this VBScript using 'cscript.exe'. Several unknown URLs were extracted, one of which is likely the source of the VBScript payload.

Heuristics 8

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • ClamAV: Doc.Downloader.SquirrelWaffle09210-9895192-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Downloader.SquirrelWaffle09210-9895192-0
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
    Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
  • Suspicious extracted artifact high 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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://scriptcaseblog.com.br/8KhqnNaE4UB/ca.html
    • https://srdm.in/0K6dTttd/ca.html
    • https://sharayuprakashan.com/90qJEVeD0VAw/ca.html
    • https://venturefiling.com/yP2brxfli/ca.html
    • http://schemas.openxmlformats.org/drawingml/2006/main
    • http://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceEvent#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a598a5f284d00810fb8ebbe23b54f09cd296e42aa2476b135acae57d751e9c5c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 23943 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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