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

Static analysis result for SHA-256 eef1fdb4c14a2e29…

MALICIOUS

Office (OLE) / .XLS

73.0 KB Created: 2019-03-15 01:23:36 Authoring application: Microsoft Excel
MD5: d8430522e2d7613bb1bcc5bf139ef677 SHA-1: 49b39391786dc7fa4de9ae3cf9d09f4966c5236c SHA-256: eef1fdb4c14a2e2930549cc065d7da24e0f284567a161129393488d100717530
240 Risk Score

Malware Insights

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

The critical ClamAV detection and high-severity heuristics for VBA macros, specifically a Workbook_Open auto-execution event and CreateObject calls, strongly indicate malicious intent. The presence of a 'Doc.Dropper.Agent-6895323-0' signature suggests this file acts as a dropper. The VBA macros likely download and execute a second-stage payload, a common technique for malware delivery.

Heuristics 6

  • ClamAV: Doc.Dropper.Agent-6895323-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Doc.Dropper.Agent-6895323-0
  • 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
625ef99830f438585c1555168939e455f48bed70b351e9132f5aad9d25495ed0		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 21602 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 7 long base64-like blob(s). Carved artifact contains 39 Chr/ChrW string-construction calls. Carved macro source contains an auto-exec entry point and execution/download terms.

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