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

Static analysis result for SHA-256 4803cd9f78d25553…

MALICIOUS

Office (OLE) / .DOC

130.0 KB Created: 2020-03-17 16:46:00 Authoring application: Microsoft Office Word
MD5: 166a0f794eaad03892301173e955ee56 SHA-1: 7449e4e2d235a9c9d05cf5985cc7a81be8e715c0 SHA-256: 4803cd9f78d255530bb277add77ba85e09d625edc94750fcced09f3ed438b5f7
230 Risk Score

Malware Insights

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

The sample is a malicious DOC file containing VBA macros, specifically a Document_Open macro that is designed to execute when the document is opened. The document body presents a fake debt collection letter, instructing the user to enable macros to obtain the full details, which acts as a lure. The presence of the 'macros.bas' file and the 'OLE_VBA_PCODE_AUTOEXEC_EXEC' heuristic indicate that the macro is intended to run automatically and likely download a second-stage payload. The ClamAV detection as 'Xls.Downloader.Generic-7648378-0' further supports this conclusion.

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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