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

Static analysis result for SHA-256 a5fc989f4dcfda61…

MALICIOUS

Office (OLE) / .DOC

130.0 KB Created: 2020-03-17 16:30:00 Authoring application: Microsoft Office Word
MD5: 5a7d62fe4d4af06bdf2b3364d54c1027 SHA-1: 96044865470f525c121dea93118fec15f6e98f6c SHA-256: a5fc989f4dcfda61180349a540f9db8bcc333d3eca42394e7aecd1f0209fe863
230 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.005 Visual Basic T1140 Deobfuscate/Decode Files or Information

The sample is a malicious Office document containing VBA macros, specifically a Document_Open macro that is designed to execute code. The document body presents a fake debt collection letter, a common lure to trick users into enabling macros. The presence of a 'macros.bas' file and the ClamAV detection as 'Xls.Downloader.Generic' strongly suggest that this document is a downloader intended to fetch and execute a second-stage payload.

Heuristics 9

  • ClamAV: Xls.Downloader.Generic-7648378-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Downloader.Generic-7648378-0
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • GetObject call high OLE_VBA_GETOBJ
    GetObject call
  • 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.
  • VBA macros detected medium OLE_VBA_MACROS
    Document contains VBA macro code
  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Suspicious extracted artifact info 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://eforms.com/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
a4e2d90a0e19bad770684d84c6f7281eb633878ff10041b8b25e062eba4b079b		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 22476 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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