Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 d5a50c0ca7518455…

MALICIOUS

Office (OLE)

239.5 KB Created: 2010-04-19 06:29:00 Authoring application: Microsoft Word 8.0
MD5: 7b3ac98292586c0b4023eec57dd5e7c7 SHA-1: b21a9ff53d896195331898d24890137ed6e14997 SHA-256: d5a50c0ca75184558ab1b5e1f419dd5e0968b4ebf225cd25e1ecc8772b9f5411
260 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with the signature Doc.Trojan.Xaler-1. Static analysis detected the presence of VBA macros, specifically triggering AutoOpen and Document_Open events, indicating an attempt to automatically execute code upon opening the document. The embedded macros are obfuscated, suggesting a downloader or droppper functionality. The document body content is a legal text, likely a lure to disguise the malicious nature of the file.

Heuristics 6

  • ClamAV: Doc.Trojan.Xaler-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Trojan.Xaler-1
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • AutoOpen macro high OLE_VBA_AUTOOPEN
    AutoOpen macro
  • Document_Open macro high OLE_VBA_DOCOPEN
    Document_Open macro
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
ef45f3aaa32e190ee0e21485d70327396c5133e86328f994b2ab5f1e5657b133		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 254846 bytes
Detection
ClamAV: Doc.Trojan.Xaler-1
Obfuscation or payload: likely
Carved artifact contains 10 Chr/ChrW string-construction calls.

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