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

Static analysis result for SHA-256 b96965d845c925b8…

MALICIOUS

Office (OLE) / .XLSX

37.5 KB Created: 2021-05-10 10:19:23 Authoring application: Microsoft Excel
MD5: 950855b20d993acd341e87feaa208037 SHA-1: 973f3a8ac29ad715ec649e9785738f60fe0a2d48 SHA-256: b96965d845c925b8dc0f3e4279ad4e571c1409891fee795bde704c5b1f063ce9
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1106 Native API

The presence of a Workbook_Open macro, combined with a CreateObject call and VBA p-code auto-execution, strongly suggests the execution of malicious VBA code upon opening the spreadsheet. This code is likely designed to download and execute a secondary payload, a common technique for initial access and further system compromise. No specific family could be identified from the available heuristics.

Heuristics 5

  • 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
4997eebed597e92dee629f3069568794523d9710f88c967ea749a9abcbe65f0f		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 4697 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.

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