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

Static analysis result for SHA-256 50b615589cc90282…

MALICIOUS

Office (OLE) / .XLS

3.44 MB Created: 2012-03-06 05:26:30
MD5: 997a7cbb49f16b20258dfe4f921b9a32 SHA-1: c34685ce2ed86b1ded484bb17dc6922b19bfb6f0 SHA-256: 50b615589cc90282970d028d26576678a5f8c97a4c4382b252eace9a6e6ebc12
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The presence of a Workbook_Open macro, along with critical firings for Shell() calls and WScript.Shell usage, indicates that the macro is designed to execute arbitrary commands. The macro likely attempts to download and execute a second-stage payload from the URL http://www.frez.co.uk. The 'Macro/content-enable lure' heuristic further supports this, as the document likely prompts the user to enable macros.

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.
    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
  • 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
    URL http://www.frez.co.uk

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
2c972c502cd8d1a904059d219e9ea9097bcb7b5203e0d00a3ebfc43f6db6991e		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1117917 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 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.

Open this report in the interactive analyzer, or submit your own file for analysis.