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

Static analysis result for SHA-256 f168b37d321935ef…

MALICIOUS

Office (OLE) / .XLSX

37.5 KB Created: 2021-04-30 09:35:08 Authoring application: Microsoft Excel
MD5: b3516494fe6955136ea6e6c6a6dfa6a6 SHA-1: c982a59c2578f1892cef4767299b7b64527c75db SHA-256: f168b37d321935ef09ef0dc2f12c85069c032da1116eb2736320f243c728c407
180 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1059.001 PowerShell T1566.002 Spearphishing Attachment

The presence of a Workbook_Open macro, coupled with a CreateObject call and VBA p-code auto-execution, strongly suggests that this Excel file is designed to automatically run malicious code upon opening. This code likely downloads and executes a second-stage payload, a common technique for initial access and further infection. No specific family could be identified, but the delivery method is typical of macro-based malware.

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
dc34f1c1ec25200e7457aa9b099b7a5606e5deaea9ee99c922fba5415f1d7af2
vba-macro oletools.olevba.extract_macros (decoded VBA source) 4737 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.