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

Static analysis result for SHA-256 a600f026c952468b…

MALICIOUS

Office (OLE) / .XLS

1.01 MB Created: 2008-07-30 16:32:13 Authoring application: Microsoft Excel
MD5: 1e70c067279c0cf7bfb9302e8eefb5b0 SHA-1: 827f7081908fc0b80784d70784b016e30c73db70 SHA-256: a600f026c952468b81b940ed4fe03568c49269e818fa7697aece8ed7f6d68921
540 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1204.002 Malicious File T1059.001 PowerShell T1071.001 Web Protocols T1105 Ingress Tool Transfer

The sample is an Excel spreadsheet containing VBA macros that are automatically executed upon opening (Workbook_Open). The macros utilize `URLDownloadToFile` and `Shell()` calls, indicating an intent to download and execute a second-stage payload from one of the embedded URLs. The document body presents itself as a calendar configuration tool, a common lure to trick users into enabling macros. The presence of `WScript.Shell` usage further supports the execution of external commands.

Heuristics 13

  • Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD
    Reference to URLDownloadToFile API
  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD
    URLDownloadToFile in VBA
  • Reference to ShellExecute API high SC_STR_SHELLEXEC
    Reference to ShellExecute API
  • 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
  • CallByName call high OLE_VBA_CALLBYNAME
    CallByName 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.MSDatec.de/
    • http://www.MSDatec.de/F
    • http://www.MSDatec.de/�
    • http://www.xl-faq.de/xl-faq/xl-faqs07.htm#xlaac
    • http://www.msdatec.de/�
    • http://www.th-o.de/kalender.htm�����
    • http://www.msdatec.de/
    • http://www.msdatec.de/kalender-info.htm
    • http://www.msdatec.de/forum/viewforum.php?f=3
    • http://www.donkarl.com/FAQ/FAQ2Allgemein.htm#2.1)P
    • http://Pwww.�\/�\f4ur@pr@X
    • http://w(ww.�\/�\fu�r@pr@X��ma��
    • http://Pwww.�\/�\f�ur@pr@X��m��
    • http://Pwww.�\/�\f4ur@pr@X@�mac���
    • http://www.ptb.de/de/org/4/43/432/oste.htm���

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
524075288885151e0cad8a3cc87b4671d312dcb2c60df042e862b91dd9c0a852		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 396167 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 6 shell/COM execution token(s). Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 68 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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