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

Static analysis result for SHA-256 2a483b176f52c3a8…

MALICIOUS

Office (OLE) / .XLS

1.13 MB Created: 1996-11-25 13:28:02 Authoring application: Microsoft Excel
MD5: 949b2b16861770075cd64ddd638fc752 SHA-1: f5e97e0a72025055610d98a88d1874907404b3da SHA-256: 2a483b176f52c3a8f52b5750c362b62548ad3531776ff85fa1573ba70368416c
248 Risk Score

Malware Insights

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

The presence of a Workbook_Open macro, combined with a CreateObject call and a reference to LoadLibrary, strongly suggests that this Excel file is designed to execute arbitrary code. The macro is likely responsible for downloading and executing a second-stage payload, as indicated by the 'SE_ENABLE_LURE' heuristic. While several URLs were extracted, they were all confirmed as benign or unknown, leaving the embedded 'macros.bas' file as the primary IOC.

Heuristics 9

  • Reference to LoadLibrary API high SC_STR_LOADLIBRARY
    Reference to LoadLibrary API
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject 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.
  • 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
  • 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
  • Environ() call (env variable access) low OLE_VBA_ENVIRON
    Environ() call (env variable access)
  • 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 http://ocsp.verisign.com0
    • https://www.verisign.com/rpa
    • https://www.verisign.com/rpa01
    • http://crl.verisign.com/pca3.crl0
    • http://CSC3-2004-crl.verisign.com/CSC3-2004.crl0D
    • https://www.verisign.com/rpa0
    • http://CSC3-2004-aia.verisign.com/CSC3-2004-aia.cer0

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
4dacfe47c592ddfbda1bcdeee1ab545c27585dad27e86f89d67e61fb342cc1ac		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 498113 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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