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

Static analysis result for SHA-256 3aafd49e8b45da7b…

MALICIOUS

Office (OLE) / .XLS

68.0 KB Created: 2018-12-06 20:43:11 Authoring application: Microsoft Excel
MD5: 76cd88a1fcedb634ba92c2dbfe23f347 SHA-1: c9d4637805cf01662d01468d9c7b4af6779f04e9 SHA-256: 3aafd49e8b45da7b71ac8e6223e86bdccb9f81f979312b66a0c6bf9b28034de1
340 Risk Score

Malware Insights

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

The sample is a malicious Excel file containing VBA macros. The Workbook_Open macro is configured to execute automatically, utilizing Shell() and WScript.Shell to run embedded code. This suggests the macro is designed to download and execute a second-stage payload, likely initiated by the 'macros.bas' artifact.

Heuristics 8

  • 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
  • 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
803111ba3b76b7a1b5ba2abdf72a82cc1f6b2b9468d840ed05ce4d865decb9cf		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 12873 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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