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

Static analysis result for SHA-256 d433165fcef9f325…

MALICIOUS

Office (OLE) / .XLS

3.26 MB Created: 2012-03-06 05:26:30
MD5: e68ea6ece802181a7db85f55731d762f SHA-1: 86626c96c897fd5592e2ccaa64c183191667e467 SHA-256: d433165fcef9f32585b508a0f39d0bee407b5a67d55f2eb7c3d954083b71ab15
380 Risk Score

Malware Insights

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

The sample is an XLS file containing a Workbook_Open VBA macro that utilizes WScript.Shell and CreateObject to execute arbitrary code. This macro is designed to download and execute a second-stage payload from the URL http://www.frez.co.uk. The presence of Shell() and WScript.Shell usage, along with VBA p-code auto-execution, strongly indicates a malicious downloader.

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
  • 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
  • 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
ded1709906a995b77a4e3b8e7c334d2f8672dfc1e76cd40fef28b478bcdc366b		 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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