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

Static analysis result for SHA-256 d5a68a111c359a22…

MALICIOUS

Office (OLE) / .XLS

91.0 KB Created: 2020-10-12 09:44:19 Authoring application: Microsoft Excel
MD5: e98b2ac88a1f33a371175e24c189ef5e SHA-1: bd9207d48d365c37466abd11c4e10af114632bad SHA-256: d5a68a111c359a22965206e7ac7d602d92789dd1aa3f0e0c8d89412fc84e24a5
400 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File

The sample is a Microsoft Excel file containing VBA macros, specifically a Workbook_Open macro that utilizes Shell() and WScript.Shell. This indicates the macro is designed to execute arbitrary commands. The embedded artifact 'macros.bas' is the VBA macro source. The document body's instruction to 'Enable content' is a common lure for macro-based attacks. The ClamAV detection further confirms its malicious nature.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • ClamAV: Xls.Macro.Obfuscation-9804250-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Macro.Obfuscation-9804250-0
  • 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
30248264ce4f73acbcbe2354b6e82aa53b673c136146975f7b8a541547df8a34		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 39434 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 shell/COM execution token(s). Carved artifact contains 113 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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