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

Static analysis result for SHA-256 2d71fca3f835fd65…

MALICIOUS

Office (OLE) / .XLS

109.5 KB Created: 2013-07-16 02:59:11 Authoring application: Microsoft Excel
MD5: c071ddaa6b3997eff7dbbade5bdd58b9 SHA-1: b9f1ac8994576eda157206f6163f2c3b317200d2 SHA-256: 2d71fca3f835fd65317dd58025181636c7bc34486660223541bdcffd056a3e84
380 Risk Score

Malware Insights

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

The sample is an XLS file containing VBA macros, specifically a Workbook_Open auto-exec macro. Heuristics indicate the use of WScript.Shell and CreateObject, suggesting the macro attempts to execute commands or download additional content. The presence of 'macros.bas' further supports this. The document body content appears to be a technical datasheet, likely a lure to disguise the malicious macro's true purpose.

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.
  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
49622bd8a1f8825bb7b8d34ce7c3cfa93bfa0dfbde73c1c4f361c516a5d33e14		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 11156 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 shell/COM execution token(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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