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

Static analysis result for SHA-256 7723b554d41db1eb…

MALICIOUS

Office (OLE) / .XLS

1.95 MB Created: 2013-08-30 14:29:57 Authoring application: Microsoft Excel
MD5: b29af4b51f795c7754e467e49f5802ad SHA-1: 1b6d76fd6be50fcc119d09cc2419af3bbbc4235f SHA-256: 7723b554d41db1eb64365dca141c9f7c8623ddc1c24bf1a95095b924ed0dea15
380 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell

The critical heuristics indicate the presence of VBA macros that utilize WScript.Shell and CreateObject to execute arbitrary code. The Workbook_Open auto-execution further suggests an immediate payload delivery. The URL http://www.frez.co.uk is flagged as suspicious and is likely the source of the secondary payload.

Heuristics 9

  • 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.
    URL http://www.frez.co.uk
    • https://web.wps.cn/et/2018/main
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
  • 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.
    URL http://www.frez.co.uk
    • https://web.wps.cn/et/2018/main
    • http://schemas.openxmlformats.org/spreadsheetml/2006/main
    • http://schemas.openxmlformats.org/officeDocument/2006/customXml
  • 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
1673f1019500dd83ed3e567b25a111eda409612ddf5c44f8f28601f235632e5c		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2366369 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 shell/COM execution token(s). Carved artifact contains 41 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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