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

Static analysis result for SHA-256 d1730c50fabbf7bc…

MALICIOUS

Office (OLE) / .XLS

3.57 MB Created: 2012-03-06 05:26:30
MD5: 3bcca6ff742e681ad317bb6f16b23ec6 SHA-1: 284df6615820daba00e9b563105d2cf474b61d10 SHA-256: d1730c50fabbf7bc5edcfc0314dac80d55fb17f751ee78b87794629ae12241b6
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample contains a Workbook_Open VBA macro that utilizes Shell() and WScript.Shell, indicating an attempt to execute arbitrary code. The presence of obfuscated VBA code and a reference to WScript.Host further supports this. The embedded URL http://www.frez.co.uk is likely used to download a secondary payload. The macro's execution of Shell() is a critical indicator of malicious intent.

Heuristics 10

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • Reference to Windows Script Host high SC_STR_WSCRIPT
    Reference to Windows Script Host
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • 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.
  • 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 http://www.frez.co.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
1698260f04869cd6f34e706a9d0395258064552b66e490ad06cf4c6a2a74ea17		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3133287 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 15 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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